## ClutterActor

ClutterActor — Base abstract class for all visual stage actors.

## Synopsis

    #define             CLUTTER_ACTOR_SET_FLAGS             (a,
                                                             f)
    #define             CLUTTER_ACTOR_UNSET_FLAGS           (a,
                                                             f)
    #define             CLUTTER_ACTOR_IS_MAPPED             (a)
    #define             CLUTTER_ACTOR_IS_REALIZED           (a)
    #define             CLUTTER_ACTOR_IS_VISIBLE            (a)
    #define             CLUTTER_ACTOR_IS_REACTIVE           (a)

    enum                ClutterActorFlags;
    enum                ClutterRequestMode;
    #define             CLUTTER_CALLBACK                    (f)
    void                (*ClutterCallback)                  (ClutterActor *actor,
                                                             gpointer data);
                        ClutterActor;
    struct              ClutterActorClass;
    void                clutter_actor_set_flags             (ClutterActor *self,
                                                             ClutterActorFlags flags);
    void                clutter_actor_unset_flags           (ClutterActor *self,
                                                             ClutterActorFlags flags);
    ClutterActorFlags   clutter_actor_get_flags             (ClutterActor *self);

    void                clutter_actor_show                  (ClutterActor *self);
    void                clutter_actor_show_all              (ClutterActor *self);
    void                clutter_actor_hide                  (ClutterActor *self);
    void                clutter_actor_hide_all              (ClutterActor *self);
    void                clutter_actor_realize               (ClutterActor *self);
    void                clutter_actor_unrealize             (ClutterActor *self);
    void                clutter_actor_paint                 (ClutterActor *self);
    void                clutter_actor_continue_paint        (ClutterActor *self);
    void                clutter_actor_queue_redraw          (ClutterActor *self);
    void                clutter_actor_queue_relayout        (ClutterActor *self);
    void                clutter_actor_destroy               (ClutterActor *self);
    gboolean            clutter_actor_event                 (ClutterActor *actor,
                                                             ClutterEvent *event,
                                                             gboolean capture);
    gboolean            clutter_actor_should_pick_paint     (ClutterActor *self);
    void                clutter_actor_map                   (ClutterActor *self);
    void                clutter_actor_unmap                 (ClutterActor *self);
    gboolean            clutter_actor_has_overlaps          (ClutterActor *self);

    enum                ClutterAllocationFlags;
    void                clutter_actor_allocate              (ClutterActor *self,
                                                             const ClutterActorBox *box,
                                                             ClutterAllocationFlags flags);
    void                clutter_actor_allocate_preferred_size
                                                            (ClutterActor *self,
                                                             ClutterAllocationFlags flags);
    void                clutter_actor_allocate_available_size
                                                            (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat available_width,
                                                             gfloat available_height,
                                                             ClutterAllocationFlags flags);
    void                clutter_actor_allocate_align_fill   (ClutterActor *self,
                                                             const ClutterActorBox *box,
                                                             gdouble x_align,
                                                             gdouble y_align,
                                                             gboolean x_fill,
                                                             gboolean y_fill,
                                                             ClutterAllocationFlags flags);
    void                clutter_actor_get_allocation_box    (ClutterActor *self,
                                                             ClutterActorBox *box);
    void                clutter_actor_get_allocation_geometry
                                                            (ClutterActor *self,
                                                             ClutterGeometry *geom);
    void                clutter_actor_get_allocation_vertices
                                                            (ClutterActor *self,
                                                             ClutterActor *ancestor,
                                                             ClutterVertex verts[]);
    void                clutter_actor_get_preferred_size    (ClutterActor *self,
                                                             gfloat *min_width_p,
                                                             gfloat *min_height_p,
                                                             gfloat *natural_width_p,
                                                             gfloat *natural_height_p);
    void                clutter_actor_get_preferred_width   (ClutterActor *self,
                                                             gfloat for_height,
                                                             gfloat *min_width_p,
                                                             gfloat *natural_width_p);
    void                clutter_actor_get_preferred_height  (ClutterActor *self,
                                                             gfloat for_width,
                                                             gfloat *min_height_p,
                                                             gfloat *natural_height_p);
    void                clutter_actor_set_fixed_position_set
                                                            (ClutterActor *self,
                                                             gboolean is_set);
    gboolean            clutter_actor_get_fixed_position_set
                                                            (ClutterActor *self);
    void                clutter_actor_set_request_mode      (ClutterActor *self,
                                                             ClutterRequestMode mode);
    ClutterRequestMode  clutter_actor_get_request_mode      (ClutterActor *self);
    gboolean            clutter_actor_has_allocation        (ClutterActor *self);

    void                clutter_actor_set_geometry          (ClutterActor *self,
                                                             const ClutterGeometry *geometry);
    void                clutter_actor_get_geometry          (ClutterActor *self,
                                                             ClutterGeometry *geometry);
    void                clutter_actor_set_size              (ClutterActor *self,
                                                             gfloat width,
                                                             gfloat height);
    void                clutter_actor_get_size              (ClutterActor *self,
                                                             gfloat *width,
                                                             gfloat *height);
    void                clutter_actor_set_position          (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y);
    void                clutter_actor_get_position          (ClutterActor *self,
                                                             gfloat *x,
                                                             gfloat *y);
    void                clutter_actor_set_width             (ClutterActor *self,
                                                             gfloat width);
    gfloat              clutter_actor_get_width             (ClutterActor *self);
    void                clutter_actor_set_height            (ClutterActor *self,
                                                             gfloat height);
    gfloat              clutter_actor_get_height            (ClutterActor *self);
    void                clutter_actor_set_x                 (ClutterActor *self,
                                                             gfloat x);
    gfloat              clutter_actor_get_x                 (ClutterActor *self);
    void                clutter_actor_set_y                 (ClutterActor *self,
                                                             gfloat y);
    gfloat              clutter_actor_get_y                 (ClutterActor *self);
    void                clutter_actor_move_by               (ClutterActor *self,
                                                             gfloat dx,
                                                             gfloat dy);
    void                clutter_actor_set_rotation          (ClutterActor *self,
                                                             ClutterRotateAxis axis,
                                                             gdouble angle,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat z);
    void                clutter_actor_set_z_rotation_from_gravity
                                                            (ClutterActor *self,
                                                             gdouble angle,
                                                             ClutterGravity gravity);
    gdouble             clutter_actor_get_rotation          (ClutterActor *self,
                                                             ClutterRotateAxis axis,
                                                             gfloat *x,
                                                             gfloat *y,
                                                             gfloat *z);
    ClutterGravity      clutter_actor_get_z_rotation_gravity
                                                            (ClutterActor *self);
    gboolean            clutter_actor_is_rotated            (ClutterActor *self);
    void                clutter_actor_set_opacity           (ClutterActor *self,
                                                             guint8 opacity);
    guint8              clutter_actor_get_opacity           (ClutterActor *self);
    enum                ClutterOffscreenRedirect;
    void                clutter_actor_set_offscreen_redirect
                                                            (ClutterActor *self,
                                                             ClutterOffscreenRedirect redirect);
    ClutterOffscreenRedirect clutter_actor_get_offscreen_redirect
                                                            (ClutterActor *self);
    void                clutter_actor_set_name              (ClutterActor *self,
                                                             const gchar *name);
    const gchar *       clutter_actor_get_name              (ClutterActor *self);
    guint32             clutter_actor_get_gid               (ClutterActor *self);

    void                clutter_actor_set_clip              (ClutterActor *self,
                                                             gfloat xoff,
                                                             gfloat yoff,
                                                             gfloat width,
                                                             gfloat height);
    void                clutter_actor_remove_clip           (ClutterActor *self);
    gboolean            clutter_actor_has_clip              (ClutterActor *self);
    void                clutter_actor_get_clip              (ClutterActor *self,
                                                             gfloat *xoff,
                                                             gfloat *yoff,
                                                             gfloat *width,
                                                             gfloat *height);
    void                clutter_actor_set_clip_to_allocation
                                                            (ClutterActor *self,
                                                             gboolean clip_set);
    gboolean            clutter_actor_get_clip_to_allocation
                                                            (ClutterActor *self);

    void                clutter_actor_set_parent            (ClutterActor *self,
                                                             ClutterActor *parent);
    ClutterActor *      clutter_actor_get_parent            (ClutterActor *self);
    void                clutter_actor_reparent              (ClutterActor *self,
                                                             ClutterActor *new_parent);
    void                clutter_actor_unparent              (ClutterActor *self);
    gboolean            clutter_actor_contains              (ClutterActor *self,
                                                             ClutterActor *descendant);
    void                clutter_actor_raise                 (ClutterActor *self,
                                                             ClutterActor *below);
    void                clutter_actor_lower                 (ClutterActor *self,
                                                             ClutterActor *above);
    void                clutter_actor_raise_top             (ClutterActor *self);
    void                clutter_actor_lower_bottom          (ClutterActor *self);
    ClutterActor *      clutter_actor_get_stage             (ClutterActor *actor);
    void                clutter_actor_push_internal         (ClutterActor *self);
    void                clutter_actor_pop_internal          (ClutterActor *self);

    void                clutter_actor_set_depth             (ClutterActor *self,
                                                             gfloat depth);
    gfloat              clutter_actor_get_depth             (ClutterActor *self);
    void                clutter_actor_set_scale             (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y);
    void                clutter_actor_set_scale_full        (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y,
                                                             gfloat center_x,
                                                             gfloat center_y);
    void                clutter_actor_set_scale_with_gravity
                                                            (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y,
                                                             ClutterGravity gravity);
    void                clutter_actor_get_scale             (ClutterActor *self,
                                                             gdouble *scale_x,
                                                             gdouble *scale_y);
    void                clutter_actor_get_scale_center      (ClutterActor *self,
                                                             gfloat *center_x,
                                                             gfloat *center_y);
    ClutterGravity      clutter_actor_get_scale_gravity     (ClutterActor *self);
    gboolean            clutter_actor_is_scaled             (ClutterActor *self);
    void                clutter_actor_apply_transform_to_point
                                                            (ClutterActor *self,
                                                             const ClutterVertex *point,
                                                             ClutterVertex *vertex);
    gboolean            clutter_actor_transform_stage_point (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat *x_out,
                                                             gfloat *y_out);
    void                clutter_actor_apply_relative_transform_to_point
                                                            (ClutterActor *self,
                                                             ClutterActor *ancestor,
                                                             const ClutterVertex *point,
                                                             ClutterVertex *vertex);
    void                clutter_actor_get_transformed_position
                                                            (ClutterActor *self,
                                                             gfloat *x,
                                                             gfloat *y);
    void                clutter_actor_get_transformed_size  (ClutterActor *self,
                                                             gfloat *width,
                                                             gfloat *height);
    guint8              clutter_actor_get_paint_opacity     (ClutterActor *self);
    gboolean            clutter_actor_get_paint_visibility  (ClutterActor *self);
    void                clutter_actor_get_abs_allocation_vertices
                                                            (ClutterActor *self,
                                                             ClutterVertex verts[]);
    void                clutter_actor_get_transformation_matrix
                                                            (ClutterActor *self,
                                                             CoglMatrix *matrix);
    const ClutterPaintVolume * clutter_actor_get_paint_volume
                                                            (ClutterActor *self);
    gboolean            clutter_actor_get_paint_box         (ClutterActor *self,
                                                             ClutterActorBox *box);
    const ClutterPaintVolume * clutter_actor_get_transformed_paint_volume
                                                            (ClutterActor *self,
                                                             ClutterActor *relative_to_ancestor);

    void                clutter_actor_set_anchor_point      (ClutterActor *self,
                                                             gfloat anchor_x,
                                                             gfloat anchor_y);
    void                clutter_actor_get_anchor_point      (ClutterActor *self,
                                                             gfloat *anchor_x,
                                                             gfloat *anchor_y);
    void                clutter_actor_set_anchor_point_from_gravity
                                                            (ClutterActor *self,
                                                             ClutterGravity gravity);
    ClutterGravity      clutter_actor_get_anchor_point_gravity
                                                            (ClutterActor *self);
    void                clutter_actor_move_anchor_point     (ClutterActor *self,
                                                             gfloat anchor_x,
                                                             gfloat anchor_y);
    void                clutter_actor_move_anchor_point_from_gravity
                                                            (ClutterActor *self,
                                                             ClutterGravity gravity);

    void                clutter_actor_set_reactive          (ClutterActor *actor,
                                                             gboolean reactive);
    gboolean            clutter_actor_get_reactive          (ClutterActor *actor);
    gboolean            clutter_actor_set_shader            (ClutterActor *self,
                                                             ClutterShader *shader);
    ClutterShader *     clutter_actor_get_shader            (ClutterActor *self);
    void                clutter_actor_set_shader_param      (ClutterActor *self,
                                                             const gchar *param,
                                                             const GValue *value);
    void                clutter_actor_set_shader_param_float
                                                            (ClutterActor *self,
                                                             const gchar *param,
                                                             gfloat value);
    void                clutter_actor_set_shader_param_int  (ClutterActor *self,
                                                             const gchar *param,
                                                             gint value);

    gboolean            clutter_actor_has_key_focus         (ClutterActor *self);
    void                clutter_actor_grab_key_focus        (ClutterActor *self);
    PangoContext *      clutter_actor_get_pango_context     (ClutterActor *self);
    PangoContext *      clutter_actor_create_pango_context  (ClutterActor *self);
    PangoLayout *       clutter_actor_create_pango_layout   (ClutterActor *self,
                                                             const gchar *text);
    gboolean            clutter_actor_is_in_clone_paint     (ClutterActor *self);
    void                clutter_actor_set_text_direction    (ClutterActor *self,
                                                             ClutterTextDirection text_dir);
    ClutterTextDirection clutter_actor_get_text_direction   (ClutterActor *self);
    gboolean            clutter_actor_has_pointer           (ClutterActor *self);
    AtkObject *         clutter_actor_get_accessible        (ClutterActor *self);

    void                clutter_actor_add_action            (ClutterActor *self,
                                                             ClutterAction *action);
    void                clutter_actor_add_action_with_name  (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterAction *action);
    void                clutter_actor_remove_action         (ClutterActor *self,
                                                             ClutterAction *action);
    void                clutter_actor_remove_action_by_name (ClutterActor *self,
                                                             const gchar *name);
    GList *             clutter_actor_get_actions           (ClutterActor *self);
    ClutterAction *     clutter_actor_get_action            (ClutterActor *self,
                                                             const gchar *name);
    void                clutter_actor_clear_actions         (ClutterActor *self);
    void                clutter_actor_add_constraint        (ClutterActor *self,
                                                             ClutterConstraint *constraint);
    void                clutter_actor_add_constraint_with_name
                                                            (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterConstraint *constraint);
    void                clutter_actor_remove_constraint     (ClutterActor *self,
                                                             ClutterConstraint *constraint);
    void                clutter_actor_remove_constraint_by_name
                                                            (ClutterActor *self,
                                                             const gchar *name);
    GList *             clutter_actor_get_constraints       (ClutterActor *self);
    ClutterConstraint * clutter_actor_get_constraint        (ClutterActor *self,
                                                             const gchar *name);
    void                clutter_actor_clear_constraints     (ClutterActor *self);
    void                clutter_actor_add_effect            (ClutterActor *self,
                                                             ClutterEffect *effect);
    void                clutter_actor_add_effect_with_name  (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterEffect *effect);
    void                clutter_actor_remove_effect         (ClutterActor *self,
                                                             ClutterEffect *effect);
    void                clutter_actor_remove_effect_by_name (ClutterActor *self,
                                                             const gchar *name);
    GList *             clutter_actor_get_effects           (ClutterActor *self);
    ClutterEffect *     clutter_actor_get_effect            (ClutterActor *self,
                                                             const gchar *name);
    void                clutter_actor_clear_effects         (ClutterActor *self);

    struct              ClutterActorBox;
    ClutterActorBox *   clutter_actor_box_new               (gfloat x_1,
                                                             gfloat y_1,
                                                             gfloat x_2,
                                                             gfloat y_2);
    ClutterActorBox *   clutter_actor_box_copy              (const ClutterActorBox *box);
    void                clutter_actor_box_free              (ClutterActorBox *box);
    gboolean            clutter_actor_box_equal             (const ClutterActorBox *box_a,
                                                             const ClutterActorBox *box_b);
    gfloat              clutter_actor_box_get_x             (const ClutterActorBox *box);
    gfloat              clutter_actor_box_get_y             (const ClutterActorBox *box);
    gfloat              clutter_actor_box_get_width         (const ClutterActorBox *box);
    gfloat              clutter_actor_box_get_height        (const ClutterActorBox *box);
    void                clutter_actor_box_set_origin        (ClutterActorBox *box,
                                                             gfloat x,
                                                             gfloat y);
    void                clutter_actor_box_get_origin        (const ClutterActorBox *box,
                                                             gfloat *x,
                                                             gfloat *y);
    void                clutter_actor_box_set_size          (ClutterActorBox *box,
                                                             gfloat width,
                                                             gfloat height);
    void                clutter_actor_box_get_size          (const ClutterActorBox *box,
                                                             gfloat *width,
                                                             gfloat *height);
    gfloat              clutter_actor_box_get_area          (const ClutterActorBox *box);
    gboolean            clutter_actor_box_contains          (const ClutterActorBox *box,
                                                             gfloat x,
                                                             gfloat y);
    void                clutter_actor_box_from_vertices     (ClutterActorBox *box,
                                                             const ClutterVertex verts[]);
    void                clutter_actor_box_clamp_to_pixel    (ClutterActorBox *box);
    void                clutter_actor_box_interpolate       (const ClutterActorBox *initial,
                                                             const ClutterActorBox *final,
                                                             gdouble progress,
                                                             ClutterActorBox *result);
    void                clutter_actor_box_union             (const ClutterActorBox *a,
                                                             const ClutterActorBox *b,
                                                             ClutterActorBox *result);

    struct              ClutterVertex;
    ClutterVertex *     clutter_vertex_new                  (gfloat x,
                                                             gfloat y,
                                                             gfloat z);
    ClutterVertex *     clutter_vertex_copy                 (const ClutterVertex *vertex);
    void                clutter_vertex_free                 (ClutterVertex *vertex);
    gboolean            clutter_vertex_equal                (const ClutterVertex *vertex_a,
                                                             const ClutterVertex *vertex_b);

    struct              ClutterGeometry;
    void                clutter_geometry_union              (const ClutterGeometry *geometry_a,
                                                             const ClutterGeometry *geometry_b,
                                                             ClutterGeometry *result);
    gboolean            clutter_geometry_intersects         (const ClutterGeometry *geometry0,
                                                             const ClutterGeometry *geometry1);

                        ClutterPaintVolume;
    ClutterPaintVolume * clutter_paint_volume_copy          (const ClutterPaintVolume *pv);
    void                clutter_paint_volume_free           (ClutterPaintVolume *pv);
    void                clutter_paint_volume_set_origin     (ClutterPaintVolume *pv,
                                                             const ClutterVertex *origin);
    void                clutter_paint_volume_get_origin     (const ClutterPaintVolume *pv,
                                                             ClutterVertex *vertex);
    void                clutter_paint_volume_set_width      (ClutterPaintVolume *pv,
                                                             gfloat width);
    gfloat              clutter_paint_volume_get_width      (const ClutterPaintVolume *pv);
    void                clutter_paint_volume_set_height     (ClutterPaintVolume *pv,
                                                             gfloat height);
    gfloat              clutter_paint_volume_get_height     (const ClutterPaintVolume *pv);
    void                clutter_paint_volume_set_depth      (ClutterPaintVolume *pv,
                                                             gfloat depth);
    gfloat              clutter_paint_volume_get_depth      (const ClutterPaintVolume *pv);
    gboolean            clutter_paint_volume_set_from_allocation
                                                            (ClutterPaintVolume *pv,
                                                             ClutterActor *actor);
    void                clutter_paint_volume_union          (ClutterPaintVolume *pv,
                                                             const ClutterPaintVolume *another_pv);

## Object Hierarchy

      GObject
       +----GInitiallyUnowned
             +----ClutterActor
                   +----ClutterBox
                   +----ClutterTexture
                   +----ClutterClone
                   +----ClutterGroup
                   +----ClutterRectangle
                   +----ClutterText

## Implemented Interfaces

ClutterActor implements ClutterScriptable, ClutterAnimatable and AtkImplementorIface.

## Properties

      "actions"                  ClutterAction*        : Write
      "allocation"               ClutterActorBox*      : Read
      "anchor-gravity"           ClutterGravity        : Read / Write
      "anchor-x"                 gfloat                : Read / Write
      "anchor-y"                 gfloat                : Read / Write
      "clip"                     ClutterGeometry*      : Read / Write
      "clip-to-allocation"       gboolean              : Read / Write
      "constraints"              ClutterConstraint*    : Write
      "depth"                    gfloat                : Read / Write
      "effect"                   ClutterEffect*        : Write
      "fixed-position-set"       gboolean              : Read / Write
      "fixed-x"                  gfloat                : Read / Write
      "fixed-y"                  gfloat                : Read / Write
      "has-clip"                 gboolean              : Read
      "has-pointer"              gboolean              : Read
      "height"                   gfloat                : Read / Write
      "mapped"                   gboolean              : Read
      "min-height"               gfloat                : Read / Write
      "min-height-set"           gboolean              : Read / Write
      "min-width"                gfloat                : Read / Write
      "min-width-set"            gboolean              : Read / Write
      "name"                     gchar*                : Read / Write
      "natural-height"           gfloat                : Read / Write
      "natural-height-set"       gboolean              : Read / Write
      "natural-width"            gfloat                : Read / Write
      "natural-width-set"        gboolean              : Read / Write
      "offscreen-redirect"       ClutterOffscreenRedirect  : Read / Write
      "opacity"                  guint                 : Read / Write
      "reactive"                 gboolean              : Read / Write
      "realized"                 gboolean              : Read
      "request-mode"             ClutterRequestMode    : Read / Write
      "rotation-angle-x"         gdouble               : Read / Write
      "rotation-angle-y"         gdouble               : Read / Write
      "rotation-angle-z"         gdouble               : Read / Write
      "rotation-center-x"        ClutterVertex*        : Read / Write
      "rotation-center-y"        ClutterVertex*        : Read / Write
      "rotation-center-z"        ClutterVertex*        : Read / Write
      "rotation-center-z-gravity" ClutterGravity        : Read / Write
      "scale-center-x"           gfloat                : Read / Write
      "scale-center-y"           gfloat                : Read / Write
      "scale-gravity"            ClutterGravity        : Read / Write
      "scale-x"                  gdouble               : Read / Write
      "scale-y"                  gdouble               : Read / Write
      "show-on-set-parent"       gboolean              : Read / Write
      "text-direction"           ClutterTextDirection  : Read / Write
      "visible"                  gboolean              : Read / Write
      "width"                    gfloat                : Read / Write
      "x"                        gfloat                : Read / Write
      "y"                        gfloat                : Read / Write

## Signals

      "allocation-changed"                             : Run Last
      "button-press-event"                             : Run Last
      "button-release-event"                           : Run Last
      "captured-event"                                 : Run Last
      "destroy"                                        : No Hooks
      "enter-event"                                    : Run Last
      "event"                                          : Run Last
      "hide"                                           : Run First
      "key-focus-in"                                   : Run Last
      "key-focus-out"                                  : Run Last
      "key-press-event"                                : Run Last
      "key-release-event"                              : Run Last
      "leave-event"                                    : Run Last
      "motion-event"                                   : Run Last
      "paint"                                          : Run Last
      "parent-set"                                     : Run Last
      "pick"                                           : Run Last
      "queue-redraw"                                   : Run Last
      "queue-relayout"                                 : Run Last
      "realize"                                        : Run Last
      "scroll-event"                                   : Run Last
      "show"                                           : Run First
      "unrealize"                                      : Run Last

## Description

ClutterActor is a base abstract class for all visual elements on the stage. Every object that must appear on the main ClutterStage must also be a ClutterActor, either by using one of the classes provided by Clutter, or by implementing a new ClutterActor subclass.

Every actor is a 2D surface positioned and optionally transformed in 3D space. The actor is positioned relative to top left corner of it parent with the childs origin being its anchor point (also top left by default).

### Actor bounding box and transformations

Any actor's 2D surface is contained inside its bounding box, as described by the ClutterActorBox structure:

Figure 1. Bounding box of an Actor

The actor box represents the untransformed area occupied by an actor. Each visible actor that has been put on a ClutterStage also has a transformed area, depending on the actual transformations applied to it by the developer (scale, rotation). Tranforms will also be applied to any child actors. Also applied to all actors by the ClutterStage is a perspective transformation. API is provided for both tranformed and untransformed actor geometry information.

The GL 'modelview' transform matrix for the actor is constructed from the actor settings by the following order of operations:

1. Translation by actor x, y coords,

2. Translation by actor depth (z),

3. Scaling by scale_x, scale_y,

4. Rotation around z axis,

5. Rotation around y axis,

6. Rotation around x axis,

7. Negative translation by anchor point x, y,

8. Rectangular Clip is applied (this is not an operation on the matrix as such, but it is done as part of the transform set up).

An actor can either be explicitly sized and positioned, using the various size and position accessors, like `clutter_actor_set_x()` or `clutter_actor_set_width()`; or it can have a preferred width and height, which then allows a layout manager to implicitly size and position it by "allocating" an area for an actor. This allows for actors to be manipulated in both a fixed (or static) parent container (i.e. children of ClutterGroup) and a more automatic (or dynamic) layout based parent container.

When accessing the position and size of an actor, the simple accessors like `clutter_actor_get_width()` and `clutter_actor_get_x()` will return a value depending on whether the actor has been explicitly sized and positioned by the developer or implicitly by the layout manager.

Depending on whether you are querying an actor or implementing a layout manager, you should either use the simple accessors or use the size negotiation API.

### Event Handling

Clutter actors are also able to receive input events and react to them. Events are handled in the following ways:

1. Actors emit pointer events if set reactive, see `clutter_actor_set_reactive()`

2. The stage is always reactive

3. Events are handled by connecting signal handlers to the numerous event signal types.

4. Event handlers must return `TRUE` if they handled the event and wish to block the event emission chain, or `FALSE` if the emission chain must continue

5. Keyboard events are emitted if actor has focus, see `clutter_stage_set_key_focus()`

6. Motion events (motion, enter, leave) are not emitted if `clutter_set_motion_events_enabled()` is called with `FALSE`. See `clutter_set_motion_events_enabled()` documentation for more information.

7. Once emitted, an event emission chain has two phases: capture and bubble. An emitted event starts in the capture phase (see ClutterActor::captured-event) beginning at the stage and traversing every child actor until the event source actor is reached. The emission then enters the bubble phase, traversing back up the chain via parents until it reaches the stage. Any event handler can abort this chain by returning `TRUE` (meaning "event handled").

8. Pointer events will 'pass through' non reactive overlapping actors.

Figure 2. Event flow in Clutter

Every '?' box in the diagram above is an entry point for application code.

### Implementing a ClutterActor

For implementing a new custom actor class, please read the corresponding section of the API reference.

### ClutterActor custom properties for ClutterScript

ClutterActor defines a custom "rotation" property which allows a short-hand description of the rotations to be applied to an actor.

The syntax of the "rotation" property is the following:

    1
    2
    3

    "rotation" : [
      { "<axis>" : [ <angle>, [ <center> ] ] }
    ]

where the axis is the name of an enumeration value of type ClutterRotateAxis and angle is a floating point value representing the rotation angle on the given axis, in degrees.

The center array is optional, and if present it must contain the center of rotation as described by two coordinates: Y and Z for "x-axis"; X and Z for "y-axis"; and X and Y for "z-axis".

ClutterActor will also parse every positional and dimensional property defined as a string through `clutter_units_from_string()`; you should read the documentation for the ClutterUnits parser format for the valid units and syntax.

### Custom animatable properties

ClutterActor allows accessing properties of ClutterAction and ClutterConstraint instances associated to an actor instance for animation purposes.

In order to access a specific ClutterAction or a ClutterConstraint property it is necessary to set the "name" property on the given action or constraint.

The property can be accessed using the following syntax:

    1

    @<section>.<meta-name>.<property-name>

The initial @ is mandatory.

The section fragment can be one between "actions", "constraints" and "effects".

The meta-name fragment is the name of the action or constraint, as specified by the "name" property.

The property-name fragment is the name of the action or constraint property to be animated.

Example 1. Animating a constraint property

The example below animates a ClutterBindConstraint applied to an actor using `clutter_actor_animate()`. The rect has a binding constraint for the origin actor, and in its initial state is fully transparent and overlapping the actor to which is bound to.

    constraint = clutter_bind_constraint_new (origin, CLUTTER_BIND_X, 0.0);
    clutter_actor_meta_set_name (CLUTTER_ACTOR_META (constraint), "bind-x");
    clutter_actor_add_constraint (rect, constraint);

    constraint = clutter_bind_constraint_new (origin, CLUTTER_BIND_Y, 0.0);
    clutter_actor_meta_set_name (CLUTTER_ACTOR_META (constraint), "bind-y");
    clutter_actor_add_constraint (rect, constraint);

    clutter_actor_set_reactive (rect, TRUE);
    clutter_actor_set_opacity (rect, 0);

    g_signal_connect (rect, "button-press-event",
                      G_CALLBACK (on_button_press),
                      NULL);

On button press, the rectangle "slides" from behind the actor to which is bound to, using the "offset" property and the "opacity" property.

    float new_offset = clutter_actor_get_width (origin) + h_padding;

    clutter_actor_animate (rect, CLUTTER_EASE_OUT_CUBIC, 500,
                           "opacity", 255,
                           "@constraints.bind-x.offset", new_offset,
                           NULL);

## Details

### CLUTTER_ACTOR_SET_FLAGS()

    #define CLUTTER_ACTOR_SET_FLAGS(a,f)    (((ClutterActor*)(a))->flags |= (f))

Sets the given flags on a ClutterActor

`a` : | a ClutterActor
`f` : | the ClutterActorFlags to set

### CLUTTER_ACTOR_UNSET_FLAGS()

    #define CLUTTER_ACTOR_UNSET_FLAGS(a,f)  (((ClutterActor*)(a))->flags &= ~(f))

Unsets the given flags on a ClutterActor

`a` : | a ClutterActor
`f` : | the ClutterActorFlags to unset

### CLUTTER_ACTOR_IS_MAPPED()

    #define CLUTTER_ACTOR_IS_MAPPED(a)      ((((ClutterActor*)(a))->flags & CLUTTER_ACTOR_MAPPED) != FALSE)

Evaluates to `TRUE` if the `CLUTTER_ACTOR_MAPPED` flag is set.

Means "the actor will be painted if the stage is mapped."

`TRUE` if the actor is visible; and all parents with possible exception of the stage are visible; and an ancestor of the actor is a toplevel.

Clutter auto-maintains the mapped flag whenever actors are reparented or shown/hidden.

`a` : | a ClutterActor

Since 0.2

### CLUTTER_ACTOR_IS_REALIZED()

    #define CLUTTER_ACTOR_IS_REALIZED(a)    ((((ClutterActor*)(a))->flags & CLUTTER_ACTOR_REALIZED) != FALSE)

Evaluates to `TRUE` if the `CLUTTER_ACTOR_REALIZED` flag is set.

The realized state has an actor-dependant interpretation. If an actor wants to delay allocating resources until it is attached to a stage, it may use the realize state to do so. However it is perfectly acceptable for an actor to allocate Cogl resources before being realized because there is only one GL context used by Clutter so any resources will work on any stage. If an actor is mapped it must also be realized, but an actor can be realized and unmapped (this is so hiding an actor temporarily doesn't do an expensive unrealize/realize).

To be realized an actor must be inside a stage, and all its parents must be realized.

`a` : | a ClutterActor

Since 0.2

### CLUTTER_ACTOR_IS_VISIBLE()

    #define CLUTTER_ACTOR_IS_VISIBLE(a)     ((((ClutterActor*)(a))->flags & CLUTTER_ACTOR_VISIBLE) != FALSE)

Evaluates to `TRUE` if the actor has been shown, `FALSE` if it's hidden. Equivalent to the ClutterActor::visible object property.

Note that an actor is only painted onscreen if it's mapped, which means it's visible, and all its parents are visible, and one of the parents is a toplevel stage.

`a` : | a ClutterActor

Since 0.2

### CLUTTER_ACTOR_IS_REACTIVE()

    #define CLUTTER_ACTOR_IS_REACTIVE(a)    ((((ClutterActor*)(a))->flags & CLUTTER_ACTOR_REACTIVE) != FALSE)

Evaluates to `TRUE` if the `CLUTTER_ACTOR_REACTIVE` flag is set.

Only reactive actors will receive event-related signals.

`a` : | a ClutterActor

Since 0.6

### enum ClutterActorFlags

    typedef enum {
      CLUTTER_ACTOR_MAPPED    = 1 << 1,
      CLUTTER_ACTOR_REALIZED  = 1 << 2,
      CLUTTER_ACTOR_REACTIVE  = 1 << 3,
      CLUTTER_ACTOR_VISIBLE   = 1 << 4,
      CLUTTER_ACTOR_NO_LAYOUT = 1 << 5
    } ClutterActorFlags;

Flags used to signal the state of an actor.

`CLUTTER_ACTOR_MAPPED` | the actor will be painted (is visible, and inside a toplevel, and all parents visible)
`CLUTTER_ACTOR_REALIZED` | the resources associated to the actor have been allocated
`CLUTTER_ACTOR_REACTIVE` | the actor 'reacts' to mouse events emmitting event signals
`CLUTTER_ACTOR_VISIBLE` | the actor has been shown by the application program
`CLUTTER_ACTOR_NO_LAYOUT` | the actor provides an explicit layout management policy for its children; this flag will prevent Clutter from automatic queueing of relayout and will defer all layouting to the actor itself

### enum ClutterRequestMode

    typedef enum {
      CLUTTER_REQUEST_HEIGHT_FOR_WIDTH,
      CLUTTER_REQUEST_WIDTH_FOR_HEIGHT
    } ClutterRequestMode;

Specifies the type of requests for a ClutterActor.

`CLUTTER_REQUEST_HEIGHT_FOR_WIDTH` | Height for width requests
`CLUTTER_REQUEST_WIDTH_FOR_HEIGHT` | Width for height requests

Since 0.8

### CLUTTER_CALLBACK()

    #define CLUTTER_CALLBACK(f)        ((ClutterCallback) (f))

Convenience macro to cast a function to ClutterCallback

`f` : | a function

### ClutterCallback ()

    void                (*ClutterCallback)                  (ClutterActor *actor,
                                                             gpointer data);

Generic callback

`actor` : | a ClutterActor
`data` : | user data. [closure]

### ClutterActor

    typedef struct {
      guint32 flags;
    } ClutterActor;

Base class for actors.

guint32 `flags`; | ClutterActorFlags

### struct ClutterActorClass

    struct ClutterActorClass {
      void (* show)                 (ClutterActor          *self);
      void (* show_all)             (ClutterActor          *self);
      void (* hide)                 (ClutterActor          *self);
      void (* hide_all)             (ClutterActor          *self);
      void (* realize)              (ClutterActor          *self);
      void (* unrealize)            (ClutterActor          *self);
      void (* map)                  (ClutterActor          *self);
      void (* unmap)                (ClutterActor          *self);
      void (* paint)                (ClutterActor          *self);
      void (* parent_set)           (ClutterActor          *actor,
                                     ClutterActor          *old_parent);

      void (* destroy)              (ClutterActor          *self);
      void (* pick)                 (ClutterActor          *actor,
                                     const ClutterColor    *color);

      void (* queue_redraw)         (ClutterActor          *actor,
                                     ClutterActor          *leaf_that_queued);

      /* size negotiation */
      void (* get_preferred_width)  (ClutterActor           *self,
                                     gfloat                  for_height,
                                     gfloat                 *min_width_p,
                                     gfloat                 *natural_width_p);
      void (* get_preferred_height) (ClutterActor           *self,
                                     gfloat                  for_width,
                                     gfloat                 *min_height_p,
                                     gfloat                 *natural_height_p);
      void (* allocate)             (ClutterActor           *self,
                                     const ClutterActorBox  *box,
                                     ClutterAllocationFlags  flags);

      /* transformations */
      void (* apply_transform)      (ClutterActor           *actor,
                                     CoglMatrix             *matrix);

      /* event signals */
      gboolean (* event)                (ClutterActor         *actor,
                                         ClutterEvent         *event);
      gboolean (* button_press_event)   (ClutterActor         *actor,
                                         ClutterButtonEvent   *event);
      gboolean (* button_release_event) (ClutterActor         *actor,
                                         ClutterButtonEvent   *event);
      gboolean (* scroll_event)         (ClutterActor         *actor,
                                         ClutterScrollEvent   *event);
      gboolean (* key_press_event)      (ClutterActor         *actor,
                                         ClutterKeyEvent      *event);
      gboolean (* key_release_event)    (ClutterActor         *actor,
                                         ClutterKeyEvent      *event);
      gboolean (* motion_event)         (ClutterActor         *actor,
                                         ClutterMotionEvent   *event);
      gboolean (* enter_event)          (ClutterActor         *actor,
                                         ClutterCrossingEvent *event);
      gboolean (* leave_event)          (ClutterActor         *actor,
                                         ClutterCrossingEvent *event);
      gboolean (* captured_event)       (ClutterActor         *actor,
                                         ClutterEvent         *event);
      void     (* key_focus_in)         (ClutterActor         *actor);
      void     (* key_focus_out)        (ClutterActor         *actor);

      void     (* queue_relayout)       (ClutterActor         *self);

      /* accessibility support */
      AtkObject * (* get_accessible)    (ClutterActor         *self);

      gboolean    (* get_paint_volume)  (ClutterActor         *actor,
                                         ClutterPaintVolume   *volume);

      gboolean (* has_overlaps)         (ClutterActor         *self);
    };

Base class for actors.

`show` () | signal class handler for "show"; it must chain up to the parent's implementation
`show_all` () | virtual function for containers and composite actors, to determine which children should be shown when calling `clutter_actor_show_all()` on the actor. Defaults to calling `clutter_actor_show()`.
`hide` () | signal class handler for "hide"; it must chain up to the parent's implementation
`hide_all` () | virtual function for containers and composite actors, to determine which children should be shown when calling `clutter_actor_hide_all()` on the actor. Defaults to calling `clutter_actor_hide()`.
`realize` () | virtual function, used to allocate resources for the actor; it should chain up to the parent's implementation
`unrealize` () | virtual function, used to deallocate resources allocated in ::realize; it should chain up to the parent's implementation
`map` () | virtual function for containers and composite actors, to map their children; it must chain up to the parent's implementation. Overriding this function is optional.
`unmap` () | virtual function for containers and composite actors, to unmap their children; it must chain up to the parent's implementation. Overriding this function is optional.
`paint` () | virtual function, used to paint the actor
`parent_set` () | signal class handler for the "parent-set"
`destroy` () | signal class handler for "destroy"
`pick` () | virtual function, used to draw an outline of the actor with the given color
`queue_redraw` () | class handler for "queue-redraw"
`get_preferred_width` () | virtual function, used when querying the minimum and natural widths of an actor for a given height; it is used by `clutter_actor_get_preferred_width()`
`get_preferred_height` () | virtual function, used when querying the minimum and natural heights of an actor for a given width; it is used by `clutter_actor_get_preferred_height()`
`allocate` () | virtual function, used when settings the coordinates of an actor; it is used by `clutter_actor_allocate()`; it must chain up to the parent's implementation
`apply_transform` () | virtual function, used when applying the transformations to an actor before painting it or when transforming coordinates or the allocation; it must chain up to the parent's implementation
`event` () | class handler for "event"
`button_press_event` () | class handler for "button-press-event"
`button_release_event` () | class handler for "button-release-event"
`scroll_event` () | signal class closure for "scroll-event"
`key_press_event` () | signal class closure for "key-press-event"
`key_release_event` () | signal class closure for "key-release-event"
`motion_event` () | signal class closure for "motion-event"
`enter_event` () | signal class closure for "enter-event"
`leave_event` () | signal class closure for "leave-event"
`captured_event` () | signal class closure for "captured-event"
`key_focus_in` () | signal class closure for "key-focus-in"
`key_focus_out` () | signal class closure for "key-focus-out"
`queue_relayout` () | class handler for "queue-relayout"
`get_accessible` () | virtual function, returns the accessible object that describes the actor to an assistive technology.
`get_paint_volume` () | virtual function, for sub-classes to define their ClutterPaintVolume
`has_overlaps` () | virtual function for sub-classes to advertise whether they need an offscreen redirect to get the correct opacity. See `clutter_actor_set_offscreen_redirect()` for details.

### clutter_actor_set_flags ()

    void                clutter_actor_set_flags             (ClutterActor *self,
                                                             ClutterActorFlags flags);

Sets `flags` on `self`

This function will emit notifications for the changed properties

`self` : | a ClutterActor
`flags` : | the flags to set

Since 1.0

### clutter_actor_unset_flags ()

    void                clutter_actor_unset_flags           (ClutterActor *self,
                                                             ClutterActorFlags flags);

Unsets `flags` on `self`

This function will emit notifications for the changed properties

`self` : | a ClutterActor
`flags` : | the flags to unset

Since 1.0

### clutter_actor_get_flags ()

    ClutterActorFlags   clutter_actor_get_flags             (ClutterActor *self);

Retrieves the flags set on `self`

`self` : | a ClutterActor
Returns : | a bitwise or of ClutterActorFlags or 0

Since 1.0

### clutter_actor_show ()

    void                clutter_actor_show                  (ClutterActor *self);

Flags an actor to be displayed. An actor that isn't shown will not be rendered on the stage.

Actors are visible by default.

If this function is called on an actor without a parent, the "show-on-set-parent" will be set to `TRUE` as a side effect.

`self` : | A ClutterActor

### clutter_actor_show_all ()

    void                clutter_actor_show_all              (ClutterActor *self);

Calls `clutter_actor_show()` on all children of an actor (if any).

`self` : | a ClutterActor

Since 0.2

### clutter_actor_hide ()

    void                clutter_actor_hide                  (ClutterActor *self);

Flags an actor to be hidden. A hidden actor will not be rendered on the stage.

Actors are visible by default.

If this function is called on an actor without a parent, the "show-on-set-parent" property will be set to `FALSE` as a side-effect.

`self` : | A ClutterActor

### clutter_actor_hide_all ()

    void                clutter_actor_hide_all              (ClutterActor *self);

Calls `clutter_actor_hide()` on all child actors (if any).

`self` : | a ClutterActor

Since 0.2

### clutter_actor_realize ()

    void                clutter_actor_realize               (ClutterActor *self);

Realization informs the actor that it is attached to a stage. It can use this to allocate resources if it wanted to delay allocation until it would be rendered. However it is perfectly acceptable for an actor to create resources before being realized because Clutter only ever has a single rendering context so that actor is free to be moved from one stage to another.

This function does nothing if the actor is already realized.

Because a realized actor must have realized parent actors, calling `clutter_actor_realize()` will also realize all parents of the actor.

This function does not realize child actors, except in the special case that realizing the stage, when the stage is visible, will suddenly map (and thus realize) the children of the stage.

`self` : | A ClutterActor

### clutter_actor_unrealize ()

    void                clutter_actor_unrealize             (ClutterActor *self);

Unrealization informs the actor that it may be being destroyed or moved to another stage. The actor may want to destroy any underlying graphics resources at this point. However it is perfectly acceptable for it to retain the resources until the actor is destroyed because Clutter only ever uses a single rendering context and all of the graphics resources are valid on any stage.

Because mapped actors must be realized, actors may not be unrealized if they are mapped. This function hides the actor to be sure it isn't mapped, an application-visible side effect that you may not be expecting.

This function should not be called by application code.

`self` : | A ClutterActor

### clutter_actor_paint ()

    void                clutter_actor_paint                 (ClutterActor *self);

Renders the actor to display.

This function should not be called directly by applications. Call `clutter_actor_queue_redraw()` to queue paints, instead.

This function is context-aware, and will either cause a regular paint or a pick paint.

This function will emit the "paint" signal or the "pick" signal, depending on the context.

This function does not paint the actor if the actor is set to 0, unless it is performing a pick paint.

`self` : | A ClutterActor

### clutter_actor_continue_paint ()

    void                clutter_actor_continue_paint        (ClutterActor *self);

Run the next stage of the paint sequence. This function should only be called within the implementation of the ‘run’ virtual of a ClutterEffect. It will cause the run method of the next effect to be applied, or it will paint the actual actor if the current effect is the last effect in the chain.

`self` : | A ClutterActor

Since 1.8

### clutter_actor_queue_redraw ()

    void                clutter_actor_queue_redraw          (ClutterActor *self);

Queues up a redraw of an actor and any children. The redraw occurs once the main loop becomes idle (after the current batch of events has been processed, roughly).

Applications rarely need to call this, as redraws are handled automatically by modification functions.

This function will not do anything if `self` is not visible, or if the actor is inside an invisible part of the scenegraph.

Also be aware that painting is a NOP for actors with an opacity of 0

When you are implementing a custom actor you must queue a redraw whenever some private state changes that will affect painting or picking of your actor.

`self` : | A ClutterActor

### clutter_actor_queue_relayout ()

    void                clutter_actor_queue_relayout        (ClutterActor *self);

Indicates that the actor's size request or other layout-affecting properties may have changed. This function is used inside ClutterActor subclass implementations, not by applications directly.

Queueing a new layout automatically queues a redraw as well.

`self` : | A ClutterActor

Since 0.8

### clutter_actor_destroy ()

    void                clutter_actor_destroy               (ClutterActor *self);

Destroys an actor. When an actor is destroyed, it will break any references it holds to other objects. If the actor is inside a container, the actor will be removed.

When you destroy a container, its children will be destroyed as well.

Note: you cannot destroy the ClutterStage returned by `clutter_stage_get_default()`.

`self` : | a ClutterActor

### clutter_actor_event ()

    gboolean            clutter_actor_event                 (ClutterActor *actor,
                                                             ClutterEvent *event,
                                                             gboolean capture);

This function is used to emit an event on the main stage. You should rarely need to use this function, except for synthetising events.

`actor` : | a ClutterActor
`event` : | a ClutterEvent
`capture` : | TRUE if event in in capture phase, FALSE otherwise.
Returns : | the return value from the signal emission: `TRUE` if the actor handled the event, or `FALSE` if the event was not handled

Since 0.6

### clutter_actor_should_pick_paint ()

    gboolean            clutter_actor_should_pick_paint     (ClutterActor *self);

Should be called inside the implementation of the "pick" virtual function in order to check whether the actor should paint itself in pick mode or not.

This function should never be called directly by applications.

`self` : | A ClutterActor
Returns : | `TRUE` if the actor should paint its silhouette, `FALSE` otherwise

### clutter_actor_map ()

    void                clutter_actor_map                   (ClutterActor *self);

Sets the `CLUTTER_ACTOR_MAPPED` flag on the actor and possibly maps and realizes its children if they are visible. Does nothing if the actor is not visible.

Calling this is allowed in only one case: you are implementing the ClutterActor ``map()`` virtual function in an actor and you need to map the children of that actor. It is not necessary to call this if you implement ClutterContainer because the default implementation will automatically map children of containers.

When overriding map, it is mandatory to chain up to the parent implementation.

`self` : | A ClutterActor

Since 1.0

### clutter_actor_unmap ()

    void                clutter_actor_unmap                 (ClutterActor *self);

Unsets the `CLUTTER_ACTOR_MAPPED` flag on the actor and possibly unmaps its children if they were mapped.

Calling this is allowed in only one case: you are implementing the ClutterActor ``unmap()`` virtual function in an actor and you need to unmap the children of that actor. It is not necessary to call this if you implement ClutterContainer because the default implementation will automatically unmap children of containers.

When overriding unmap, it is mandatory to chain up to the parent implementation.

`self` : | A ClutterActor

Since 1.0

### clutter_actor_has_overlaps ()

    gboolean            clutter_actor_has_overlaps          (ClutterActor *self);

Asks the actor's implementation whether it may contain overlapping primitives.

For example; Clutter may use this to determine whether the painting should be redirected to an offscreen buffer to correctly implement the opacity property.

Custom actors can override the default response by implementing the ClutterActor `has_overlaps` virtual function. See `clutter_actor_set_offscreen_redirect()` for more information.

`self` : | A ClutterActor
Returns : | `TRUE` if the actor may have overlapping primitives, and `FALSE` otherwise

Since 1.8

### enum ClutterAllocationFlags

    typedef enum {
      CLUTTER_ALLOCATION_NONE         = 0,
      CLUTTER_ABSOLUTE_ORIGIN_CHANGED = 1 << 1
    } ClutterAllocationFlags;

Flags passed to the ClutterActor::`allocate()` virtual function and to the `clutter_actor_allocate()` function

`CLUTTER_ALLOCATION_NONE` | No flag set
`CLUTTER_ABSOLUTE_ORIGIN_CHANGED` | Whether the absolute origin of the actor has changed; this implies that any ancestor of the actor has been moved

Since 1.0

### clutter_actor_allocate ()

    void                clutter_actor_allocate              (ClutterActor *self,
                                                             const ClutterActorBox *box,
                                                             ClutterAllocationFlags flags);

Called by the parent of an actor to assign the actor its size. Should never be called by applications (except when implementing a container or layout manager).

Actors can know from their allocation box whether they have moved with respect to their parent actor. The `flags` parameter describes additional information about the allocation, for instance whether the parent has moved with respect to the stage, for example because a grandparent's origin has moved.

`self` : | A ClutterActor
`box` : | new allocation of the actor, in parent-relative coordinates
`flags` : | flags that control the allocation

Since 0.8

### clutter_actor_allocate_preferred_size ()

    void                clutter_actor_allocate_preferred_size
                                                            (ClutterActor *self,
                                                             ClutterAllocationFlags flags);

Allocates the natural size of `self`.

This function is a utility call for ClutterActor implementations that allocates the actor's preferred natural size. It can be used by fixed layout managers (like ClutterGroup or so called 'composite actors') inside the ClutterActor::allocate implementation to give each child exactly how much space it requires.

This function is not meant to be used by applications. It is also not meant to be used outside the implementation of the ClutterActor::allocate virtual function.

`self` : | a ClutterActor
`flags` : | flags controlling the allocation

Since 0.8

### clutter_actor_allocate_available_size ()

    void                clutter_actor_allocate_available_size
                                                            (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat available_width,
                                                             gfloat available_height,
                                                             ClutterAllocationFlags flags);

Allocates `self` taking into account the ClutterActor's preferred size, but limiting it to the maximum available width and height provided.

This function will do the right thing when dealing with the actor's request mode.

The implementation of this function is equivalent to:

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    if (request_mode == CLUTTER_REQUEST_HEIGHT_FOR_WIDTH)
      {
        clutter_actor_get_preferred_width (self, available_height,
                                           &min_width,
                                           &natural_width);
        width = CLAMP (natural_width, min_width, available_width);

        clutter_actor_get_preferred_height (self, width,
                                            &min_height,
                                            &natural_height);
        height = CLAMP (natural_height, min_height, available_height);
      }
    else
      {
        clutter_actor_get_preferred_height (self, available_width,
                                            &min_height,
                                            &natural_height);
        height = CLAMP (natural_height, min_height, available_height);

        clutter_actor_get_preferred_width (self, height,
                                           &min_width,
                                           &natural_width);
        width = CLAMP (natural_width, min_width, available_width);
      }

    box.x1 = x; box.y1 = y;
    box.x2 = box.x1 + available_width;
    box.y2 = box.y1 + available_height;
    clutter_actor_allocate (self, &box, flags);

This function can be used by fluid layout managers to allocate an actor's preferred size without making it bigger than the area available for the container.

`self` : | a ClutterActor
`x` : | the actor's X coordinate
`y` : | the actor's Y coordinate
`available_width` : | the maximum available width, or -1 to use the actor's natural width
`available_height` : | the maximum available height, or -1 to use the actor's natural height
`flags` : | flags controlling the allocation

Since 1.0

### clutter_actor_allocate_align_fill ()

    void                clutter_actor_allocate_align_fill   (ClutterActor *self,
                                                             const ClutterActorBox *box,
                                                             gdouble x_align,
                                                             gdouble y_align,
                                                             gboolean x_fill,
                                                             gboolean y_fill,
                                                             ClutterAllocationFlags flags);

Allocates `self` by taking into consideration the available allocation area; an alignment factor on either axis; and whether the actor should fill the allocation on either axis.

The `box` should contain the available allocation width and height; if the x1 and y1 members of ClutterActorBox are not set to 0, the allocation will be offset by their value.

This function takes into consideration the geometry request specified by the "request-mode" property, and the text direction.

This function is useful for fluid layout managers, like ClutterBinLayout or ClutterTableLayout

`self` : | a ClutterActor
`box` : | a ClutterActorBox, containing the available width and height
`x_align` : | the horizontal alignment, between 0 and 1
`y_align` : | the vertical alignment, between 0 and 1
`x_fill` : | whether the actor should fill horizontally
`y_fill` : | whether the actor should fill vertically
`flags` : | allocation flags to be passed to `clutter_actor_allocate()`

Since 1.4

### clutter_actor_get_allocation_box ()

    void                clutter_actor_get_allocation_box    (ClutterActor *self,
                                                             ClutterActorBox *box);

Gets the layout box an actor has been assigned. The allocation can only be assumed valid inside a `paint()` method; anywhere else, it may be out-of-date.

An allocation does not incorporate the actor's scale or anchor point; those transformations do not affect layout, only rendering.

### Note

Do not call any of the clutter_actor_get_allocation_*() family of functions inside the implementation of the `get_preferred_width()` or `get_preferred_height()` virtual functions.

`self` : | A ClutterActor
`box` : | the function fills this in with the actor's allocation. [out]

Since 0.8

### clutter_actor_get_allocation_geometry ()

    void                clutter_actor_get_allocation_geometry
                                                            (ClutterActor *self,
                                                             ClutterGeometry *geom);

Gets the layout box an actor has been assigned. The allocation can only be assumed valid inside a `paint()` method; anywhere else, it may be out-of-date.

An allocation does not incorporate the actor's scale or anchor point; those transformations do not affect layout, only rendering.

The returned rectangle is in pixels.

`self` : | A ClutterActor
`geom` : | allocation geometry in pixels. [out]

Since 0.8

### clutter_actor_get_allocation_vertices ()

    void                clutter_actor_get_allocation_vertices
                                                            (ClutterActor *self,
                                                             ClutterActor *ancestor,
                                                             ClutterVertex verts[]);

Calculates the transformed coordinates of the four corners of the actor in the plane of `ancestor`. The returned vertices relate to the ClutterActorBox coordinates as follows:

- `verts`[0] contains (x1, y1)

- `verts`[1] contains (x2, y1)

- `verts`[2] contains (x1, y2)

- `verts`[3] contains (x2, y2)

If `ancestor` is `NULL` the ancestor will be the ClutterStage. In this case, the coordinates returned will be the coordinates on the stage before the projection is applied. This is different from the behaviour of `clutter_actor_get_abs_allocation_vertices()`.

`self` : | A ClutterActor
`ancestor` : | A ClutterActor to calculate the vertices against, or `NULL` to use the ClutterStage. [allow-none]
`verts` : | return location for an array of 4 ClutterVertex in which to store the result. [out][array fixed-size=4][element-type Clutter.Vertex]

Since 0.6

### clutter_actor_get_preferred_size ()

    void                clutter_actor_get_preferred_size    (ClutterActor *self,
                                                             gfloat *min_width_p,
                                                             gfloat *min_height_p,
                                                             gfloat *natural_width_p,
                                                             gfloat *natural_height_p);

Computes the preferred minimum and natural size of an actor, taking into account the actor's geometry management (either height-for-width or width-for-height).

The width and height used to compute the preferred height and preferred width are the actor's natural ones.

If you need to control the height for the preferred width, or the width for the preferred height, you should use `clutter_actor_get_preferred_width()` and `clutter_actor_get_preferred_height()`, and check the actor's preferred geometry management using the "request-mode" property.

`self` : | a ClutterActor
`min_width_p` : | return location for the minimum width, or `NULL`. [out][allow-none]
`min_height_p` : | return location for the minimum height, or `NULL`. [out][allow-none]
`natural_width_p` : | return location for the natural width, or `NULL`. [out][allow-none]
`natural_height_p` : | return location for the natural height, or `NULL`. [out][allow-none]

Since 0.8

### clutter_actor_get_preferred_width ()

    void                clutter_actor_get_preferred_width   (ClutterActor *self,
                                                             gfloat for_height,
                                                             gfloat *min_width_p,
                                                             gfloat *natural_width_p);

Computes the requested minimum and natural widths for an actor, optionally depending on the specified height, or if they are already computed, returns the cached values.

An actor may not get its request - depending on the layout manager that's in effect.

A request should not incorporate the actor's scale or anchor point; those transformations do not affect layout, only rendering.

`self` : | A ClutterActor
`for_height` : | available height when computing the preferred width, or a negative value to indicate that no height is defined
`min_width_p` : | return location for minimum width, or `NULL`. [out][allow-none]
`natural_width_p` : | return location for the natural width, or `NULL`. [out][allow-none]

Since 0.8

### clutter_actor_get_preferred_height ()

    void                clutter_actor_get_preferred_height  (ClutterActor *self,
                                                             gfloat for_width,
                                                             gfloat *min_height_p,
                                                             gfloat *natural_height_p);

Computes the requested minimum and natural heights for an actor, or if they are already computed, returns the cached values.

An actor may not get its request - depending on the layout manager that's in effect.

A request should not incorporate the actor's scale or anchor point; those transformations do not affect layout, only rendering.

`self` : | A ClutterActor
`for_width` : | available width to assume in computing desired height, or a negative value to indicate that no width is defined
`min_height_p` : | return location for minimum height, or `NULL`. [out][allow-none]
`natural_height_p` : | return location for natural height, or `NULL`. [out][allow-none]

Since 0.8

### clutter_actor_set_fixed_position_set ()

    void                clutter_actor_set_fixed_position_set
                                                            (ClutterActor *self,
                                                             gboolean is_set);

Sets whether an actor has a fixed position set (and will thus be unaffected by any layout manager).

`self` : | A ClutterActor
`is_set` : | whether to use fixed position

Since 0.8

### clutter_actor_get_fixed_position_set ()

    gboolean            clutter_actor_get_fixed_position_set
                                                            (ClutterActor *self);

Checks whether an actor has a fixed position set (and will thus be unaffected by any layout manager).

`self` : | A ClutterActor
Returns : | `TRUE` if the fixed position is set on the actor

Since 0.8

### clutter_actor_set_request_mode ()

    void                clutter_actor_set_request_mode      (ClutterActor *self,
                                                             ClutterRequestMode mode);

Sets the geometry request mode of `self`.

The `mode` determines the order for invoking `clutter_actor_get_preferred_width()` and `clutter_actor_get_preferred_height()`

`self` : | a ClutterActor
`mode` : | the request mode

Since 1.2

### clutter_actor_get_request_mode ()

    ClutterRequestMode  clutter_actor_get_request_mode      (ClutterActor *self);

Retrieves the geometry request mode of `self`

`self` : | a ClutterActor
Returns : | the request mode for the actor

Since 1.2

### clutter_actor_has_allocation ()

    gboolean            clutter_actor_has_allocation        (ClutterActor *self);

Checks if the actor has an up-to-date allocation assigned to it. This means that the actor should have an allocation: it's visible and has a parent. It also means that there is no outstanding relayout request in progress for the actor or its children (There might be other outstanding layout requests in progress that will cause the actor to get a new allocation when the stage is laid out, however).

If this function returns `FALSE`, then the actor will normally be allocated before it is next drawn on the screen.

`self` : | a ClutterActor
Returns : | `TRUE` if the actor has an up-to-date allocation

Since 1.4

### clutter_actor_set_geometry ()

    void                clutter_actor_set_geometry          (ClutterActor *self,
                                                             const ClutterGeometry *geometry);

Sets the actor's fixed position and forces its minimum and natural size, in pixels. This means the untransformed actor will have the given geometry. This is the same as calling `clutter_actor_set_position()` and `clutter_actor_set_size()`.

`self` : | A ClutterActor
`geometry` : | A ClutterGeometry

### clutter_actor_get_geometry ()

    void                clutter_actor_get_geometry          (ClutterActor *self,
                                                             ClutterGeometry *geometry);

Gets the size and position of an actor relative to its parent actor. This is the same as calling `clutter_actor_get_position()` and `clutter_actor_get_size()`. It tries to "do what you mean" and get the requested size and position if the actor's allocation is invalid.

`self` : | A ClutterActor
`geometry` : | A location to store actors ClutterGeometry. [out]

### clutter_actor_set_size ()

    void                clutter_actor_set_size              (ClutterActor *self,
                                                             gfloat width,
                                                             gfloat height);

Sets the actor's size request in pixels. This overrides any "normal" size request the actor would have. For example a text actor might normally request the size of the text; this function would force a specific size instead.

If `width` and/or `height` are -1 the actor will use its "normal" size request instead of overriding it, i.e. you can "unset" the size with -1.

This function sets or unsets both the minimum and natural size.

`self` : | A ClutterActor
`width` : | New width of actor in pixels, or -1
`height` : | New height of actor in pixels, or -1

### clutter_actor_get_size ()

    void                clutter_actor_get_size              (ClutterActor *self,
                                                             gfloat *width,
                                                             gfloat *height);

This function tries to "do what you mean" and return the size an actor will have. If the actor has a valid allocation, the allocation will be returned; otherwise, the actors natural size request will be returned.

If you care whether you get the request vs. the allocation, you should probably call a different function like `clutter_actor_get_allocation_box()` or `clutter_actor_get_preferred_width()`.

`self` : | A ClutterActor
`width` : | return location for the width, or `NULL`. [out][allow-none]
`height` : | return location for the height, or `NULL`. [out][allow-none]

Since 0.2

### clutter_actor_set_position ()

    void                clutter_actor_set_position          (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y);

Sets the actor's fixed position in pixels relative to any parent actor.

If a layout manager is in use, this position will override the layout manager and force a fixed position.

`self` : | A ClutterActor
`x` : | New left position of actor in pixels.
`y` : | New top position of actor in pixels.

### clutter_actor_get_position ()

    void                clutter_actor_get_position          (ClutterActor *self,
                                                             gfloat *x,
                                                             gfloat *y);

This function tries to "do what you mean" and tell you where the actor is, prior to any transformations. Retrieves the fixed position of an actor in pixels, if one has been set; otherwise, if the allocation is valid, returns the actor's allocated position; otherwise, returns 0,0.

The returned position is in pixels.

`self` : | a ClutterActor
`x` : | return location for the X coordinate, or `NULL`. [out][allow-none]
`y` : | return location for the Y coordinate, or `NULL`. [out][allow-none]

Since 0.6

### clutter_actor_set_width ()

    void                clutter_actor_set_width             (ClutterActor *self,
                                                             gfloat width);

Forces a width on an actor, causing the actor's preferred width and height (if any) to be ignored.

If `width` is -1 the actor will use its preferred width request instead of overriding it, i.e. you can "unset" the width with -1.

This function sets both the minimum and natural size of the actor.

`self` : | A ClutterActor
`width` : | Requested new width for the actor, in pixels, or -1

Since 0.2

### clutter_actor_get_width ()

    gfloat              clutter_actor_get_width             (ClutterActor *self);

Retrieves the width of a ClutterActor.

If the actor has a valid allocation, this function will return the width of the allocated area given to the actor.

If the actor does not have a valid allocation, this function will return the actor's natural width, that is the preferred width of the actor.

If you care whether you get the preferred width or the width that has been assigned to the actor, you should probably call a different function like `clutter_actor_get_allocation_box()` to retrieve the allocated size or `clutter_actor_get_preferred_width()` to retrieve the preferred width.

If an actor has a fixed width, for instance a width that has been assigned using `clutter_actor_set_width()`, the width returned will be the same value.

`self` : | A ClutterActor
Returns : | the width of the actor, in pixels

### clutter_actor_set_height ()

    void                clutter_actor_set_height            (ClutterActor *self,
                                                             gfloat height);

Forces a height on an actor, causing the actor's preferred width and height (if any) to be ignored.

If `height` is -1 the actor will use its preferred height instead of overriding it, i.e. you can "unset" the height with -1.

This function sets both the minimum and natural size of the actor.

`self` : | A ClutterActor
`height` : | Requested new height for the actor, in pixels, or -1

Since 0.2

### clutter_actor_get_height ()

    gfloat              clutter_actor_get_height            (ClutterActor *self);

Retrieves the height of a ClutterActor.

If the actor has a valid allocation, this function will return the height of the allocated area given to the actor.

If the actor does not have a valid allocation, this function will return the actor's natural height, that is the preferred height of the actor.

If you care whether you get the preferred height or the height that has been assigned to the actor, you should probably call a different function like `clutter_actor_get_allocation_box()` to retrieve the allocated size or `clutter_actor_get_preferred_height()` to retrieve the preferred height.

If an actor has a fixed height, for instance a height that has been assigned using `clutter_actor_set_height()`, the height returned will be the same value.

`self` : | A ClutterActor
Returns : | the height of the actor, in pixels

### clutter_actor_set_x ()

    void                clutter_actor_set_x                 (ClutterActor *self,
                                                             gfloat x);

Sets the actor's X coordinate, relative to its parent, in pixels.

Overrides any layout manager and forces a fixed position for the actor.

`self` : | a ClutterActor
`x` : | the actor's position on the X axis

Since 0.6

### clutter_actor_get_x ()

    gfloat              clutter_actor_get_x                 (ClutterActor *self);

Retrieves the X coordinate of a ClutterActor.

This function tries to "do what you mean", by returning the correct value depending on the actor's state.

If the actor has a valid allocation, this function will return the X coordinate of the origin of the allocation box.

If the actor has any fixed coordinate set using `clutter_actor_set_x()`, `clutter_actor_set_position()` or `clutter_actor_set_geometry()`, this function will return that coordinate.

If both the allocation and a fixed position are missing, this function will return 0.

`self` : | A ClutterActor
Returns : | the X coordinate, in pixels, ignoring any transformation (i.e. scaling, rotation)

### clutter_actor_set_y ()

    void                clutter_actor_set_y                 (ClutterActor *self,
                                                             gfloat y);

Sets the actor's Y coordinate, relative to its parent, in pixels.#

Overrides any layout manager and forces a fixed position for the actor.

`self` : | a ClutterActor
`y` : | the actor's position on the Y axis

Since 0.6

### clutter_actor_get_y ()

    gfloat              clutter_actor_get_y                 (ClutterActor *self);

Retrieves the Y coordinate of a ClutterActor.

This function tries to "do what you mean", by returning the correct value depending on the actor's state.

If the actor has a valid allocation, this function will return the Y coordinate of the origin of the allocation box.

If the actor has any fixed coordinate set using `clutter_actor_set_y()`, `clutter_actor_set_position()` or `clutter_actor_set_geometry()`, this function will return that coordinate.

If both the allocation and a fixed position are missing, this function will return 0.

`self` : | A ClutterActor
Returns : | the Y coordinate, in pixels, ignoring any transformation (i.e. scaling, rotation)

### clutter_actor_move_by ()

    void                clutter_actor_move_by               (ClutterActor *self,
                                                             gfloat dx,
                                                             gfloat dy);

Moves an actor by the specified distance relative to its current position in pixels.

This function modifies the fixed position of an actor and thus removes it from any layout management. Another way to move an actor is with an anchor point, see `clutter_actor_set_anchor_point()`.

`self` : | A ClutterActor
`dx` : | Distance to move Actor on X axis.
`dy` : | Distance to move Actor on Y axis.

Since 0.2

### clutter_actor_set_rotation ()

    void                clutter_actor_set_rotation          (ClutterActor *self,
                                                             ClutterRotateAxis axis,
                                                             gdouble angle,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat z);

Sets the rotation angle of `self` around the given axis.

The rotation center coordinates used depend on the value of `axis`:

- `CLUTTER_X_AXIS` requires `y` and `z`

- `CLUTTER_Y_AXIS` requires `x` and `z`

- `CLUTTER_Z_AXIS` requires `x` and `y`

The rotation coordinates are relative to the anchor point of the actor, set using `clutter_actor_set_anchor_point()`. If no anchor point is set, the upper left corner is assumed as the origin.

`self` : | a ClutterActor
`axis` : | the axis of rotation
`angle` : | the angle of rotation
`x` : | X coordinate of the rotation center
`y` : | Y coordinate of the rotation center
`z` : | Z coordinate of the rotation center

Since 0.8

### clutter_actor_set_z_rotation_from_gravity ()

    void                clutter_actor_set_z_rotation_from_gravity
                                                            (ClutterActor *self,
                                                             gdouble angle,
                                                             ClutterGravity gravity);

Sets the rotation angle of `self` around the Z axis using the center point specified as a compass point. For example to rotate such that the center of the actor remains static you can use `CLUTTER_GRAVITY_CENTER`. If the actor changes size the center point will move accordingly.

`self` : | a ClutterActor
`angle` : | the angle of rotation
`gravity` : | the center point of the rotation

Since 1.0

### clutter_actor_get_rotation ()

    gdouble             clutter_actor_get_rotation          (ClutterActor *self,
                                                             ClutterRotateAxis axis,
                                                             gfloat *x,
                                                             gfloat *y,
                                                             gfloat *z);

Retrieves the angle and center of rotation on the given axis, set using `clutter_actor_set_rotation()`.

`self` : | a ClutterActor
`axis` : | the axis of rotation
`x` : | return value for the X coordinate of the center of rotation. [out]
`y` : | return value for the Y coordinate of the center of rotation. [out]
`z` : | return value for the Z coordinate of the center of rotation. [out]
Returns : | the angle of rotation

Since 0.8

### clutter_actor_get_z_rotation_gravity ()

    ClutterGravity      clutter_actor_get_z_rotation_gravity
                                                            (ClutterActor *self);

Retrieves the center for the rotation around the Z axis as a compass direction. If the center was specified in pixels or units this will return `CLUTTER_GRAVITY_NONE`.

`self` : | A ClutterActor
Returns : | the Z rotation center

Since 1.0

### clutter_actor_is_rotated ()

    gboolean            clutter_actor_is_rotated            (ClutterActor *self);

Checks whether any rotation is applied to the actor.

`self` : | a ClutterActor
Returns : | `TRUE` if the actor is rotated.

Since 0.6

### clutter_actor_set_opacity ()

    void                clutter_actor_set_opacity           (ClutterActor *self,
                                                             guint8 opacity);

Sets the actor's opacity, with zero being completely transparent and 255 (0xff) being fully opaque.

`self` : | A ClutterActor
`opacity` : | New opacity value for the actor.

### clutter_actor_get_opacity ()

    guint8              clutter_actor_get_opacity           (ClutterActor *self);

Retrieves the opacity value of an actor, as set by `clutter_actor_set_opacity()`.

For retrieving the absolute opacity of the actor inside a paint virtual function, see `clutter_actor_get_paint_opacity()`.

`self` : | a ClutterActor
Returns : | the opacity of the actor

### enum ClutterOffscreenRedirect

    typedef enum {
      CLUTTER_OFFSCREEN_REDIRECT_AUTOMATIC_FOR_OPACITY = 1<<0,
      CLUTTER_OFFSCREEN_REDIRECT_ALWAYS = 1<<1
    } ClutterOffscreenRedirect;

Possible flags to pass to `clutter_actor_set_offscreen_redirect()`.

`CLUTTER_OFFSCREEN_REDIRECT_AUTOMATIC_FOR_OPACITY` | Only redirect the actor if it is semi-transparent and its `has_overlaps()` virtual returns `TRUE`. This is the default.
`CLUTTER_OFFSCREEN_REDIRECT_ALWAYS` | Always redirect the actor to an offscreen buffer even if it is fully opaque.

Since 1.8

### clutter_actor_set_offscreen_redirect ()

    void                clutter_actor_set_offscreen_redirect
                                                            (ClutterActor *self,
                                                             ClutterOffscreenRedirect redirect);

Defines the circumstances where the actor should be redirected into an offscreen image. The offscreen image is used to flatten the actor into a single image while painting for two main reasons. Firstly, when the actor is painted a second time without any of its contents changing it can simply repaint the cached image without descending further down the actor hierarchy. Secondly, it will make the opacity look correct even if there are overlapping primitives in the actor.

Caching the actor could in some cases be a performance win and in some cases be a performance lose so it is important to determine which value is right for an actor before modifying this value. For example, there is never any reason to flatten an actor that is just a single texture (such as a ClutterTexture) because it is effectively already cached in an image so the offscreen would be redundant. Also if the actor contains primitives that are far apart with a large transparent area in the middle (such as a large CluterGroup with a small actor in the top left and a small actor in the bottom right) then the cached image will contain the entire image of the large area and the paint will waste time blending all of the transparent pixels in the middle.

The default method of implementing opacity on a container simply forwards on the opacity to all of the children. If the children are overlapping then it will appear as if they are two separate glassy objects and there will be a break in the color where they overlap. By redirecting to an offscreen buffer it will be as if the two opaque objects are combined into one and then made transparent which is usually what is expected.

The image below demonstrates the difference between redirecting and not. The image shows two Clutter groups, each containing a red and a green rectangle which overlap. The opacity on the group is set to 128 (which is 50%). When the offscreen redirect is not used, the red rectangle can be seen through the blue rectangle as if the two rectangles were separately transparent. When the redirect is used the group as a whole is transparent instead so the red rectangle is not visible where they overlap.

Figure 3. Sample of using an offscreen redirect for transparency

The default value for this property is 0, so we effectively will never redirect an actor offscreen by default. This means that there are times that transparent actors may look glassy as described above. The reason this is the default is because there is a performance trade off between quality and performance here. In many cases the default form of glassy opacity looks good enough, but if it's not you will need to set the `CLUTTER_OFFSCREEN_REDIRECT_AUTOMATIC_FOR_OPACITY` flag to enable redirection for opacity.

Custom actors that don't contain any overlapping primitives are recommended to override the `has_overlaps()` virtual to return `FALSE` for maximum efficiency.

`self` : | A ClutterActor
`redirect` : | New offscreen redirect flags for the actor.

Since 1.8

### clutter_actor_get_offscreen_redirect ()

    ClutterOffscreenRedirect clutter_actor_get_offscreen_redirect
                                                            (ClutterActor *self);

Retrieves whether to redirect the actor to an offscreen buffer, as set by `clutter_actor_set_offscreen_redirect()`.

`self` : | a ClutterActor
Returns : | the value of the offscreen-redirect property of the actor

Since 1.8

### clutter_actor_set_name ()

    void                clutter_actor_set_name              (ClutterActor *self,
                                                             const gchar *name);

Sets the given name to `self`. The name can be used to identify a ClutterActor.

`self` : | A ClutterActor
`name` : | Textual tag to apply to actor

### clutter_actor_get_name ()

    const gchar *       clutter_actor_get_name              (ClutterActor *self);

Retrieves the name of `self`.

`self` : | A ClutterActor
Returns : | the name of the actor, or `NULL`. The returned string is owned by the actor and should not be modified or freed.

### clutter_actor_get_gid ()

    guint32             clutter_actor_get_gid               (ClutterActor *self);

### Warning

`clutter_actor_get_gid` has been deprecated since version 1.8 and should not be used in newly-written code. The id is not used any longer.

Retrieves the unique id for `self`.

`self` : | A ClutterActor
Returns : | Globally unique value for this object instance.

Since 0.6

### clutter_actor_set_clip ()

    void                clutter_actor_set_clip              (ClutterActor *self,
                                                             gfloat xoff,
                                                             gfloat yoff,
                                                             gfloat width,
                                                             gfloat height);

Sets clip area for `self`. The clip area is always computed from the upper left corner of the actor, even if the anchor point is set otherwise.

`self` : | A ClutterActor
`xoff` : | X offset of the clip rectangle
`yoff` : | Y offset of the clip rectangle
`width` : | Width of the clip rectangle
`height` : | Height of the clip rectangle

Since 0.6

### clutter_actor_remove_clip ()

    void                clutter_actor_remove_clip           (ClutterActor *self);

Removes clip area from `self`.

`self` : | A ClutterActor

### clutter_actor_has_clip ()

    gboolean            clutter_actor_has_clip              (ClutterActor *self);

Determines whether the actor has a clip area set or not.

`self` : | a ClutterActor
Returns : | `TRUE` if the actor has a clip area set.

Since 0.1.1

### clutter_actor_get_clip ()

    void                clutter_actor_get_clip              (ClutterActor *self,
                                                             gfloat *xoff,
                                                             gfloat *yoff,
                                                             gfloat *width,
                                                             gfloat *height);

Gets the clip area for `self`, if any is set

`self` : | a ClutterActor
`xoff` : | return location for the X offset of the clip rectangle, or `NULL`. [out][allow-none]
`yoff` : | return location for the Y offset of the clip rectangle, or `NULL`. [out][allow-none]
`width` : | return location for the width of the clip rectangle, or `NULL`. [out][allow-none]
`height` : | return location for the height of the clip rectangle, or `NULL`. [out][allow-none]

Since 0.6

### clutter_actor_set_clip_to_allocation ()

    void                clutter_actor_set_clip_to_allocation
                                                            (ClutterActor *self,
                                                             gboolean clip_set);

Sets whether `self` should be clipped to the same size as its allocation

`self` : | a ClutterActor
`clip_set` : | `TRUE` to apply a clip tracking the allocation

Since 1.4

### clutter_actor_get_clip_to_allocation ()

    gboolean            clutter_actor_get_clip_to_allocation
                                                            (ClutterActor *self);

Retrieves the value set using `clutter_actor_set_clip_to_allocation()`

`self` : | a ClutterActor
Returns : | `TRUE` if the ClutterActor is clipped to its allocation

Since 1.4

### clutter_actor_set_parent ()

    void                clutter_actor_set_parent            (ClutterActor *self,
                                                             ClutterActor *parent);

Sets the parent of `self` to `parent`. The opposite function is `clutter_actor_unparent()`.

This function should not be used by applications, but by custom container actor subclasses.

`self` : | A ClutterActor
`parent` : | A new ClutterActor parent

### clutter_actor_get_parent ()

    ClutterActor *      clutter_actor_get_parent            (ClutterActor *self);

Retrieves the parent of `self`.

`self` : | A ClutterActor
Returns : | The ClutterActor parent, or `NULL` if no parent is set. [transfer none]

### clutter_actor_reparent ()

    void                clutter_actor_reparent              (ClutterActor *self,
                                                             ClutterActor *new_parent);

This function resets the parent actor of `self`. It is logically equivalent to calling `clutter_actor_unparent()` and `clutter_actor_set_parent()`, but more efficiently implemented, ensures the child is not finalized when unparented, and emits the parent-set signal only one time.

`self` : | a ClutterActor
`new_parent` : | the new ClutterActor parent

Since 0.2

### clutter_actor_unparent ()

    void                clutter_actor_unparent              (ClutterActor *self);

Removes the parent of `self`.

This function should not be used in applications.

This function should only be called by implementations of the ClutterContainer interface, or by composite actors that do not implicitly create their children.

`self` : | a ClutterActor

Since 0.1.1

### clutter_actor_contains ()

    gboolean            clutter_actor_contains              (ClutterActor *self,
                                                             ClutterActor *descendant);

Determines if `descendant` is contained inside `self` (either as an immediate child, or as a deeper descendant). If `self` and `descendant` point to the same actor then it will also return `TRUE`.

`self` : | A ClutterActor
`descendant` : | A ClutterActor, possibly contained in `self`
Returns : | whether `descendent` is contained within `self`

Since 1.4

### clutter_actor_raise ()

    void                clutter_actor_raise                 (ClutterActor *self,
                                                             ClutterActor *below);

Puts `self` above `below`.

Both actors must have the same parent, and the parent must implement the ClutterContainer interface

This function is the equivalent of `clutter_container_raise_child()`.

`self` : | A ClutterActor
`below` : | A ClutterActor to raise above. [allow-none]

### clutter_actor_lower ()

    void                clutter_actor_lower                 (ClutterActor *self,
                                                             ClutterActor *above);

Puts `self` below `above`.

Both actors must have the same parent, and the parent must implement the ClutterContainer interface.

This function is the equivalent of `clutter_container_lower_child()`.

`self` : | A ClutterActor
`above` : | A ClutterActor to lower below. [allow-none]

### clutter_actor_raise_top ()

    void                clutter_actor_raise_top             (ClutterActor *self);

Raises `self` to the top.

This function calls `clutter_actor_raise()` internally.

`self` : | A ClutterActor

### clutter_actor_lower_bottom ()

    void                clutter_actor_lower_bottom          (ClutterActor *self);

Lowers `self` to the bottom.

This function calls `clutter_actor_lower()` internally.

`self` : | A ClutterActor

### clutter_actor_get_stage ()

    ClutterActor *      clutter_actor_get_stage             (ClutterActor *actor);

Retrieves the ClutterStage where `actor` is contained.

`actor` : | a ClutterActor
Returns : | the stage containing the actor, or `NULL`. [transfer none][type Clutter.Actor]

Since 0.8

### clutter_actor_push_internal ()

    void                clutter_actor_push_internal         (ClutterActor *self);

Should be used by actors implementing the ClutterContainer and with internal children added through `clutter_actor_set_parent()`, for instance:

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    static void
    my_actor_init (MyActor *self)
    {
      self->priv = SELF_ACTOR_GET_PRIVATE (self);

      clutter_actor_push_internal (CLUTTER_ACTOR (self));

      /* calling clutter_actor_set_parent() now will result in
       * the internal flag being set on a child of MyActor
       */

      /* internal child - a background texture */
      self->priv->background_tex = clutter_texture_new ();
      clutter_actor_set_parent (self->priv->background_tex,
                                CLUTTER_ACTOR (self));

      /* internal child - a label */
      self->priv->label = clutter_text_new ();
      clutter_actor_set_parent (self->priv->label,
                                CLUTTER_ACTOR (self));

      clutter_actor_pop_internal (CLUTTER_ACTOR (self));

      /* calling clutter_actor_set_parent() now will not result in
       * the internal flag being set on a child of MyActor
       */
    }

This function will be used by Clutter to toggle an "internal child" flag whenever `clutter_actor_set_parent()` is called; internal children are handled differently by Clutter, specifically when destroying their parent.

Call `clutter_actor_pop_internal()` when you finished adding internal children.

Nested calls to `clutter_actor_push_internal()` are allowed, but each one must by followed by a `clutter_actor_pop_internal()` call.

`self` : | a ClutterActor

Since 1.2

### clutter_actor_pop_internal ()

    void                clutter_actor_pop_internal          (ClutterActor *self);

Disables the effects of `clutter_actor_push_internal()`

`self` : | a ClutterActor

Since 1.2

### clutter_actor_set_depth ()

    void                clutter_actor_set_depth             (ClutterActor *self,
                                                             gfloat depth);

Sets the Z coordinate of `self` to `depth`.

The unit used by `depth` is dependant on the perspective setup. See also `clutter_stage_set_perspective()`.

`self` : | a ClutterActor
`depth` : | Z co-ord

### clutter_actor_get_depth ()

    gfloat              clutter_actor_get_depth             (ClutterActor *self);

Retrieves the depth of `self`.

`self` : | a ClutterActor
Returns : | the depth of the actor

### clutter_actor_set_scale ()

    void                clutter_actor_set_scale             (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y);

Scales an actor with the given factors. The scaling is relative to the scale center and the anchor point. The scale center is unchanged by this function and defaults to 0,0.

`self` : | A ClutterActor
`scale_x` : | double factor to scale actor by horizontally.
`scale_y` : | double factor to scale actor by vertically.

Since 0.2

### clutter_actor_set_scale_full ()

    void                clutter_actor_set_scale_full        (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y,
                                                             gfloat center_x,
                                                             gfloat center_y);

Scales an actor with the given factors around the given center point. The center point is specified in pixels relative to the anchor point (usually the top left corner of the actor).

`self` : | A ClutterActor
`scale_x` : | double factor to scale actor by horizontally.
`scale_y` : | double factor to scale actor by vertically.
`center_x` : | X coordinate of the center of the scale.
`center_y` : | Y coordinate of the center of the scale

Since 1.0

### clutter_actor_set_scale_with_gravity ()

    void                clutter_actor_set_scale_with_gravity
                                                            (ClutterActor *self,
                                                             gdouble scale_x,
                                                             gdouble scale_y,
                                                             ClutterGravity gravity);

Scales an actor with the given factors around the given center point. The center point is specified as one of the compass directions in ClutterGravity. For example, setting it to north will cause the top of the actor to remain unchanged and the rest of the actor to expand left, right and downwards.

`self` : | A ClutterActor
`scale_x` : | double factor to scale actor by horizontally.
`scale_y` : | double factor to scale actor by vertically.
`gravity` : | the location of the scale center expressed as a compass direction.

Since 1.0

### clutter_actor_get_scale ()

    void                clutter_actor_get_scale             (ClutterActor *self,
                                                             gdouble *scale_x,
                                                             gdouble *scale_y);

Retrieves an actors scale factors.

`self` : | A ClutterActor
`scale_x` : | Location to store horizonal scale factor, or `NULL`. [out][allow-none]
`scale_y` : | Location to store vertical scale factor, or `NULL`. [out][allow-none]

Since 0.2

### clutter_actor_get_scale_center ()

    void                clutter_actor_get_scale_center      (ClutterActor *self,
                                                             gfloat *center_x,
                                                             gfloat *center_y);

Retrieves the scale center coordinate in pixels relative to the top left corner of the actor. If the scale center was specified using a ClutterGravity this will calculate the pixel offset using the current size of the actor.

`self` : | A ClutterActor
`center_x` : | Location to store the X position of the scale center, or `NULL`. [out][allow-none]
`center_y` : | Location to store the Y position of the scale center, or `NULL`. [out][allow-none]

Since 1.0

### clutter_actor_get_scale_gravity ()

    ClutterGravity      clutter_actor_get_scale_gravity     (ClutterActor *self);

Retrieves the scale center as a compass direction. If the scale center was specified in pixels or units this will return `CLUTTER_GRAVITY_NONE`.

`self` : | A ClutterActor
Returns : | the scale gravity

Since 1.0

### clutter_actor_is_scaled ()

    gboolean            clutter_actor_is_scaled             (ClutterActor *self);

Checks whether the actor is scaled in either dimension.

`self` : | a ClutterActor
Returns : | `TRUE` if the actor is scaled.

Since 0.6

### clutter_actor_apply_transform_to_point ()

    void                clutter_actor_apply_transform_to_point
                                                            (ClutterActor *self,
                                                             const ClutterVertex *point,
                                                             ClutterVertex *vertex);

Transforms `point` in coordinates relative to the actor into screen-relative coordinates with the current actor transformation (i.e. scale, rotation, etc)

`self` : | A ClutterActor
`point` : | A point as ClutterVertex
`vertex` : | The translated ClutterVertex. [out caller-allocates]

Since 0.4

### clutter_actor_transform_stage_point ()

    gboolean            clutter_actor_transform_stage_point (ClutterActor *self,
                                                             gfloat x,
                                                             gfloat y,
                                                             gfloat *x_out,
                                                             gfloat *y_out);

This function translates screen coordinates (`x`, `y`) to coordinates relative to the actor. For example, it can be used to translate screen events from global screen coordinates into actor-local coordinates.

The conversion can fail, notably if the transform stack results in the actor being projected on the screen as a mere line.

The conversion should not be expected to be pixel-perfect due to the nature of the operation. In general the error grows when the skewing of the actor rectangle on screen increases.

### Note

This function can be computationally intensive.

### Note

This function only works when the allocation is up-to-date, i.e. inside of `paint()`.

`self` : | A ClutterActor
`x` : | x screen coordinate of the point to unproject. [in]
`y` : | y screen coordinate of the point to unproject. [in]
`x_out` : | return location for the unprojected x coordinance. [out]
`y_out` : | return location for the unprojected y coordinance. [out]
Returns : | `TRUE` if conversion was successful.

Since 0.6

### clutter_actor_apply_relative_transform_to_point ()

    void                clutter_actor_apply_relative_transform_to_point
                                                            (ClutterActor *self,
                                                             ClutterActor *ancestor,
                                                             const ClutterVertex *point,
                                                             ClutterVertex *vertex);

Transforms `point` in coordinates relative to the actor into ancestor-relative coordinates using the relevant transform stack (i.e. scale, rotation, etc).

If `ancestor` is `NULL` the ancestor will be the ClutterStage. In this case, the coordinates returned will be the coordinates on the stage before the projection is applied. This is different from the behaviour of `clutter_actor_apply_transform_to_point()`.

`self` : | A ClutterActor
`ancestor` : | A ClutterActor ancestor, or `NULL` to use the default ClutterStage. [allow-none]
`point` : | A point as ClutterVertex
`vertex` : | The translated ClutterVertex. [out caller-allocates]

Since 0.6

### clutter_actor_get_transformed_position ()

    void                clutter_actor_get_transformed_position
                                                            (ClutterActor *self,
                                                             gfloat *x,
                                                             gfloat *y);

Gets the absolute position of an actor, in pixels relative to the stage.

`self` : | A ClutterActor
`x` : | return location for the X coordinate, or `NULL`. [out][allow-none]
`y` : | return location for the Y coordinate, or `NULL`. [out][allow-none]

Since 0.8

### clutter_actor_get_transformed_size ()

    void                clutter_actor_get_transformed_size  (ClutterActor *self,
                                                             gfloat *width,
                                                             gfloat *height);

Gets the absolute size of an actor in pixels, taking into account the scaling factors.

If the actor has a valid allocation, the allocated size will be used. If the actor has not a valid allocation then the preferred size will be transformed and returned.

If you want the transformed allocation, see `clutter_actor_get_abs_allocation_vertices()` instead.

### Note

When the actor (or one of its ancestors) is rotated around the X or Y axis, it no longer appears as on the stage as a rectangle, but as a generic quadrangle; in that case this function returns the size of the smallest rectangle that encapsulates the entire quad. Please note that in this case no assumptions can be made about the relative position of this envelope to the absolute position of the actor, as returned by `clutter_actor_get_transformed_position()`; if you need this information, you need to use `clutter_actor_get_abs_allocation_vertices()` to get the coords of the actual quadrangle.

`self` : | A ClutterActor
`width` : | return location for the width, or `NULL`. [out][allow-none]
`height` : | return location for the height, or `NULL`. [out][allow-none]

Since 0.8

### clutter_actor_get_paint_opacity ()

    guint8              clutter_actor_get_paint_opacity     (ClutterActor *self);

Retrieves the absolute opacity of the actor, as it appears on the stage.

This function traverses the hierarchy chain and composites the opacity of the actor with that of its parents.

This function is intended for subclasses to use in the paint virtual function, to paint themselves with the correct opacity.

`self` : | A ClutterActor
Returns : | The actor opacity value.

Since 0.8

### clutter_actor_get_paint_visibility ()

    gboolean            clutter_actor_get_paint_visibility  (ClutterActor *self);

Retrieves the 'paint' visibility of an actor recursively checking for non visible parents.

This is by definition the same as `CLUTTER_ACTOR_IS_MAPPED()`.

`self` : | A ClutterActor
Returns : | TRUE if the actor is visibile and will be painted.

Since 0.8.4

### clutter_actor_get_abs_allocation_vertices ()

    void                clutter_actor_get_abs_allocation_vertices
                                                            (ClutterActor *self,
                                                             ClutterVertex verts[]);

Calculates the transformed screen coordinates of the four corners of the actor; the returned vertices relate to the ClutterActorBox coordinates as follows:

- v[0] contains (x1, y1)

- v[1] contains (x2, y1)

- v[2] contains (x1, y2)

- v[3] contains (x2, y2)

`self` : | A ClutterActor
`verts` : | Pointer to a location of an array of 4 ClutterVertex where to store the result. [out][array fixed-size=4]

Since 0.4

### clutter_actor_get_transformation_matrix ()

    void                clutter_actor_get_transformation_matrix
                                                            (ClutterActor *self,
                                                             CoglMatrix *matrix);

Retrieves the transformations applied to `self` relative to its parent.

`self` : | a ClutterActor
`matrix` : | the return location for a CoglMatrix. [out caller-allocates]

Since 1.0

### clutter_actor_get_paint_volume ()

    const ClutterPaintVolume * clutter_actor_get_paint_volume
                                                            (ClutterActor *self);

Retrieves the paint volume of the passed ClutterActor, or `NULL` when a paint volume can't be determined.

The paint volume is defined as the 3D space occupied by an actor when being painted.

This function will call the ``get_paint_volume()`` virtual function of the ClutterActor class. Sub-classes of ClutterActor should not usually care about overriding the default implementation, unless they are, for instance: painting outside their allocation, or actors with a depth factor (not in terms of "depth" but real 3D depth).

### Note

2D actors overriding ``get_paint_volume()`` ensure their volume has a depth of 0. (This will be true so long as you don't call `clutter_paint_volume_set_depth()`.)

`self` : | a ClutterActor
Returns : | a pointer to a ClutterPaintVolume or `NULL` if no volume could be determined. [transfer none]

Since 1.6

### clutter_actor_get_paint_box ()

    gboolean            clutter_actor_get_paint_box         (ClutterActor *self,
                                                             ClutterActorBox *box);

Retrieves the paint volume of the passed ClutterActor, and transforms it into a 2D bounding box in stage coordinates.

This function is useful to determine the on screen area occupied by the actor. The box is only an approximation and may often be considerably larger due to the optimizations used to calculate the box. The box is never smaller though, so it can reliably be used for culling.

There are times when a 2D paint box can't be determined, e.g. because the actor isn't yet parented under a stage or because the actor is unable to determine a paint volume.

`self` : | a ClutterActor
`box` : | return location for a ClutterActorBox. [out]
Returns : | `TRUE` if a 2D paint box could be determined, else `FALSE`.

Since 1.6

### clutter_actor_get_transformed_paint_volume ()

    const ClutterPaintVolume * clutter_actor_get_transformed_paint_volume
                                                            (ClutterActor *self,
                                                             ClutterActor *relative_to_ancestor);

Retrieves the 3D paint volume of an actor like `clutter_actor_get_paint_volume()` does (Please refer to the documentation of `clutter_actor_get_paint_volume()` for more details.) and it additionally transforms the paint volume into the coordinate space of `relative_to_ancestor`. (Or the stage if `NULL` is passed for `relative_to_ancestor`)

This can be used by containers that base their paint volume on the volume of their children. Such containers can query the transformed paint volume of all of its children and union them together using `clutter_paint_volume_union()`.

`self` : | a ClutterActor
`relative_to_ancestor` : | A ClutterActor that is an ancestor of `self` (or `NULL` for the stage)
Returns : | a pointer to a ClutterPaintVolume or `NULL` if no volume could be determined. [transfer none]

Since 1.6

### clutter_actor_set_anchor_point ()

    void                clutter_actor_set_anchor_point      (ClutterActor *self,
                                                             gfloat anchor_x,
                                                             gfloat anchor_y);

Sets an anchor point for `self`. The anchor point is a point in the coordinate space of an actor to which the actor position within its parent is relative; the default is (0, 0), i.e. the top-left corner of the actor.

`self` : | a ClutterActor
`anchor_x` : | X coordinate of the anchor point
`anchor_y` : | Y coordinate of the anchor point

Since 0.6

### clutter_actor_get_anchor_point ()

    void                clutter_actor_get_anchor_point      (ClutterActor *self,
                                                             gfloat *anchor_x,
                                                             gfloat *anchor_y);

Gets the current anchor point of the `actor` in pixels.

`self` : | a ClutterActor
`anchor_x` : | return location for the X coordinate of the anchor point. [out]
`anchor_y` : | return location for the Y coordinate of the anchor point. [out]

Since 0.6

### clutter_actor_set_anchor_point_from_gravity ()

    void                clutter_actor_set_anchor_point_from_gravity
                                                            (ClutterActor *self,
                                                             ClutterGravity gravity);

Sets an anchor point on the actor, based on the given gravity (this is a convenience function wrapping `clutter_actor_set_anchor_point()`).

Since version 1.0 the anchor point will be stored as a gravity so that if the actor changes size then the anchor point will move. For example, if you set the anchor point to `CLUTTER_GRAVITY_SOUTH_EAST` and later double the size of the actor, the anchor point will move to the bottom right.

`self` : | a ClutterActor
`gravity` : | ClutterGravity.

Since 0.6

### clutter_actor_get_anchor_point_gravity ()

    ClutterGravity      clutter_actor_get_anchor_point_gravity
                                                            (ClutterActor *self);

Retrieves the anchor position expressed as a ClutterGravity. If the anchor point was specified using pixels or units this will return `CLUTTER_GRAVITY_NONE`.

`self` : | a ClutterActor
Returns : | the ClutterGravity used by the anchor point

Since 1.0

### clutter_actor_move_anchor_point ()

    void                clutter_actor_move_anchor_point     (ClutterActor *self,
                                                             gfloat anchor_x,
                                                             gfloat anchor_y);

Sets an anchor point for the actor, and adjusts the actor postion so that the relative position of the actor toward its parent remains the same.

`self` : | a ClutterActor
`anchor_x` : | X coordinate of the anchor point
`anchor_y` : | Y coordinate of the anchor point

Since 0.6

### clutter_actor_move_anchor_point_from_gravity ()

    void                clutter_actor_move_anchor_point_from_gravity
                                                            (ClutterActor *self,
                                                             ClutterGravity gravity);

Sets an anchor point on the actor based on the given gravity, adjusting the actor postion so that its relative position within its parent remains unchanged.

Since version 1.0 the anchor point will be stored as a gravity so that if the actor changes size then the anchor point will move. For example, if you set the anchor point to `CLUTTER_GRAVITY_SOUTH_EAST` and later double the size of the actor, the anchor point will move to the bottom right.

`self` : | a ClutterActor
`gravity` : | ClutterGravity.

Since 0.6

### clutter_actor_set_reactive ()

    void                clutter_actor_set_reactive          (ClutterActor *actor,
                                                             gboolean reactive);

Sets `actor` as reactive. Reactive actors will receive events.

`actor` : | a ClutterActor
`reactive` : | whether the actor should be reactive to events

Since 0.6

### clutter_actor_get_reactive ()

    gboolean            clutter_actor_get_reactive          (ClutterActor *actor);

Checks whether `actor` is marked as reactive.

`actor` : | a ClutterActor
Returns : | `TRUE` if the actor is reactive

Since 0.6

### clutter_actor_set_shader ()

    gboolean            clutter_actor_set_shader            (ClutterActor *self,
                                                             ClutterShader *shader);

### Warning

`clutter_actor_set_shader` has been deprecated since version 1.8 and should not be used in newly-written code. Use ClutterShaderEffect and `clutter_actor_add_effect()` instead.

Sets the ClutterShader to be used when rendering `self`.

If `shader` is `NULL` this function will unset any currently set shader for the actor.

### Note

Any ClutterEffect applied to `self` will take the precedence over the ClutterShader set using this function.

`self` : | a ClutterActor
`shader` : | a ClutterShader or `NULL` to unset the shader. [allow-none]
Returns : | `TRUE` if the shader was successfully applied or removed

Since 0.6

### clutter_actor_get_shader ()

    ClutterShader *     clutter_actor_get_shader            (ClutterActor *self);

### Warning

`clutter_actor_get_shader` has been deprecated since version 1.8 and should not be used in newly-written code. Use `clutter_actor_get_effect()` instead.

Queries the currently set ClutterShader on `self`.

`self` : | a ClutterActor
Returns : | The currently set ClutterShader or `NULL` if no shader is set. [transfer none]

Since 0.6

### clutter_actor_set_shader_param ()

    void                clutter_actor_set_shader_param      (ClutterActor *self,
                                                             const gchar *param,
                                                             const GValue *value);

### Warning

`clutter_actor_set_shader_param` has been deprecated since version 1.8 and should not be used in newly-written code. Use `clutter_shader_effect_set_uniform_value()` instead

Sets the value for a named parameter of the shader applied to `actor`.

`self` : | a ClutterActor
`param` : | the name of the parameter
`value` : | the value of the parameter

Since 1.0

### clutter_actor_set_shader_param_float ()

    void                clutter_actor_set_shader_param_float
                                                            (ClutterActor *self,
                                                             const gchar *param,
                                                             gfloat value);

### Warning

`clutter_actor_set_shader_param_float` has been deprecated since version 1.8 and should not be used in newly-written code. Use `clutter_shader_effect_set_uniform()` instead

Sets the value for a named float parameter of the shader applied to `actor`.

`self` : | a ClutterActor
`param` : | the name of the parameter
`value` : | the value of the parameter

Since 0.8

### clutter_actor_set_shader_param_int ()

    void                clutter_actor_set_shader_param_int  (ClutterActor *self,
                                                             const gchar *param,
                                                             gint value);

### Warning

`clutter_actor_set_shader_param_int` has been deprecated since version 1.8 and should not be used in newly-written code. Use `clutter_shader_effect_set_uniform()` instead

Sets the value for a named int parameter of the shader applied to `actor`.

`self` : | a ClutterActor
`param` : | the name of the parameter
`value` : | the value of the parameter

Since 0.8

### clutter_actor_has_key_focus ()

    gboolean            clutter_actor_has_key_focus         (ClutterActor *self);

Checks whether `self` is the ClutterActor that has key focus

`self` : | a ClutterActor
Returns : | `TRUE` if the actor has key focus, and `FALSE` otherwise

Since 1.4

### clutter_actor_grab_key_focus ()

    void                clutter_actor_grab_key_focus        (ClutterActor *self);

Sets the key focus of the ClutterStage including `self` to this ClutterActor.

`self` : | a ClutterActor

Since 1.0

### clutter_actor_get_pango_context ()

    PangoContext *      clutter_actor_get_pango_context     (ClutterActor *self);

Retrieves the PangoContext for `self`. The actor's PangoContext is already configured using the appropriate font map, resolution and font options.

Unlike `clutter_actor_create_pango_context()`, this context is owend by the ClutterActor and it will be updated each time the options stored by the ClutterBackend change.

You can use the returned PangoContext to create a PangoLayout and render text using `cogl_pango_render_layout()` to reuse the glyphs cache also used by Clutter.

`self` : | a ClutterActor
Returns : | the PangoContext for a ClutterActor. The returned PangoContext is owned by the actor and should not be unreferenced by the application code. [transfer none]

Since 1.0

### clutter_actor_create_pango_context ()

    PangoContext *      clutter_actor_create_pango_context  (ClutterActor *self);

Creates a PangoContext for the given actor. The PangoContext is already configured using the appropriate font map, resolution and font options.

See also `clutter_actor_get_pango_context()`.

`self` : | a ClutterActor
Returns : | the newly created PangoContext. Use `g_object_unref()` on the returned value to deallocate its resources. [transfer full]

Since 1.0

### clutter_actor_create_pango_layout ()

    PangoLayout *       clutter_actor_create_pango_layout   (ClutterActor *self,
                                                             const gchar *text);

Creates a new PangoLayout from the same PangoContext used by the ClutterActor. The PangoLayout is already configured with the font map, resolution and font options, and the given `text`.

If you want to keep around a PangoLayout created by this function you will have to connect to the "font-changed" and "resolution-changed" signals, and call `pango_layout_context_changed()` in response to them.

`self` : | a ClutterActor
`text` : | (allow-none) the text to set on the PangoLayout, or `NULL`
Returns : | the newly created PangoLayout. Use `g_object_unref()` when done. [transfer full]

Since 1.0

### clutter_actor_is_in_clone_paint ()

    gboolean            clutter_actor_is_in_clone_paint     (ClutterActor *self);

Checks whether `self` is being currently painted by a ClutterClone

This function is useful only inside the ::paint virtual function implementations or within handlers for the "paint" signal

This function should not be used by applications

`self` : | a ClutterActor
Returns : | `TRUE` if the ClutterActor is currently being painted by a ClutterClone, and `FALSE` otherwise

Since 1.0

### clutter_actor_set_text_direction ()

    void                clutter_actor_set_text_direction    (ClutterActor *self,
                                                             ClutterTextDirection text_dir);

Sets the ClutterTextDirection for an actor

The passed text direction must not be `CLUTTER_TEXT_DIRECTION_DEFAULT`

If `self` implements ClutterContainer then this function will recurse inside all the children of `self` (including the internal ones).

Composite actors not implementing ClutterContainer, or actors requiring special handling when the text direction changes, should connect to the "notify" signal for the "text-direction" property

`self` : | a ClutterActor
`text_dir` : | the text direction for `self`

Since 1.2

### clutter_actor_get_text_direction ()

    ClutterTextDirection clutter_actor_get_text_direction   (ClutterActor *self);

Retrieves the value set using `clutter_actor_set_text_direction()`

If no text direction has been previously set, the default text direction, as returned by `clutter_get_default_text_direction()`, will be returned instead

`self` : | a ClutterActor
Returns : | the ClutterTextDirection for the actor

Since 1.2

### clutter_actor_has_pointer ()

    gboolean            clutter_actor_has_pointer           (ClutterActor *self);

Checks whether an actor contains the pointer of a ClutterInputDevice

`self` : | a ClutterActor
Returns : | `TRUE` if the actor contains the pointer, and `FALSE` otherwise

Since 1.2

### clutter_actor_get_accessible ()

    AtkObject *         clutter_actor_get_accessible        (ClutterActor *self);

Returns the accessible object that describes the actor to an assistive technology.

If no class-specific AtkObject implementation is available for the actor instance in question, it will inherit an AtkObject implementation from the first ancestor class for which such an implementation is defined.

The documentation of the ATK library contains more information about accessible objects and their uses.

`self` : | a ClutterActor
Returns : | the AtkObject associated with `actor`. [transfer none]

### clutter_actor_add_action ()

    void                clutter_actor_add_action            (ClutterActor *self,
                                                             ClutterAction *action);

Adds `action` to the list of actions applied to `self`

A ClutterAction can only belong to one actor at a time

The ClutterActor will hold a reference on `action` until either `clutter_actor_remove_action()` or `clutter_actor_clear_actions()` is called

`self` : | a ClutterActor
`action` : | a ClutterAction

Since 1.4

### clutter_actor_add_action_with_name ()

    void                clutter_actor_add_action_with_name  (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterAction *action);

A convenience function for setting the name of a ClutterAction while adding it to the list of actions applied to `self`

This function is the logical equivalent of:

    1
    2

    clutter_actor_meta_set_name (CLUTTER_ACTOR_META (action), name);
    clutter_actor_add_action (self, action);

`self` : | a ClutterActor
`name` : | the name to set on the action
`action` : | a ClutterAction

Since 1.4

### clutter_actor_remove_action ()

    void                clutter_actor_remove_action         (ClutterActor *self,
                                                             ClutterAction *action);

Removes `action` from the list of actions applied to `self`

The reference held by `self` on the ClutterAction will be released

`self` : | a ClutterActor
`action` : | a ClutterAction

Since 1.4

### clutter_actor_remove_action_by_name ()

    void                clutter_actor_remove_action_by_name (ClutterActor *self,
                                                             const gchar *name);

Removes the ClutterAction with the given name from the list of actions applied to `self`

`self` : | a ClutterActor
`name` : | the name of the action to remove

Since 1.4

### clutter_actor_get_actions ()

    GList *             clutter_actor_get_actions           (ClutterActor *self);

Retrieves the list of actions applied to `self`

`self` : | a ClutterActor
Returns : | a copy of the list of ClutterActions. The contents of the list are owned by the ClutterActor. Use `g_list_free()` to free the resources allocated by the returned GList. [transfer container][element-type Clutter.Action]

Since 1.4

### clutter_actor_get_action ()

    ClutterAction *     clutter_actor_get_action            (ClutterActor *self,
                                                             const gchar *name);

Retrieves the ClutterAction with the given name in the list of actions applied to `self`

`self` : | a ClutterActor
`name` : | the name of the action to retrieve
Returns : | a ClutterAction for the given name, or `NULL`. The returned ClutterAction is owned by the actor and it should not be unreferenced directly. [transfer none]

Since 1.4

### clutter_actor_clear_actions ()

    void                clutter_actor_clear_actions         (ClutterActor *self);

Clears the list of actions applied to `self`

`self` : | a ClutterActor

Since 1.4

### clutter_actor_add_constraint ()

    void                clutter_actor_add_constraint        (ClutterActor *self,
                                                             ClutterConstraint *constraint);

Adds `constraint` to the list of ClutterConstraints applied to `self`

The ClutterActor will hold a reference on the `constraint` until either `clutter_actor_remove_constraint()` or `clutter_actor_clear_constraints()` is called.

`self` : | a ClutterActor
`constraint` : | a ClutterConstraint

Since 1.4

### clutter_actor_add_constraint_with_name ()

    void                clutter_actor_add_constraint_with_name
                                                            (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterConstraint *constraint);

A convenience function for setting the name of a ClutterConstraint while adding it to the list of constraints applied to `self`

This function is the logical equivalent of:

    1
    2

    clutter_actor_meta_set_name (CLUTTER_ACTOR_META (constraint), name);
    clutter_actor_add_constraint (self, constraint);

`self` : | a ClutterActor
`name` : | the name to set on the constraint
`constraint` : | a ClutterConstraint

Since 1.4

### clutter_actor_remove_constraint ()

    void                clutter_actor_remove_constraint     (ClutterActor *self,
                                                             ClutterConstraint *constraint);

Removes `constraint` from the list of constraints applied to `self`

The reference held by `self` on the ClutterConstraint will be released

`self` : | a ClutterActor
`constraint` : | a ClutterConstraint

Since 1.4

### clutter_actor_remove_constraint_by_name ()

    void                clutter_actor_remove_constraint_by_name
                                                            (ClutterActor *self,
                                                             const gchar *name);

Removes the ClutterConstraint with the given name from the list of constraints applied to `self`

`self` : | a ClutterActor
`name` : | the name of the constraint to remove

Since 1.4

### clutter_actor_get_constraints ()

    GList *             clutter_actor_get_constraints       (ClutterActor *self);

Retrieves the list of constraints applied to `self`

`self` : | a ClutterActor
Returns : | a copy of the list of ClutterConstraints. The contents of the list are owned by the ClutterActor. Use `g_list_free()` to free the resources allocated by the returned GList. [transfer container][element-type Clutter.Constraint]

Since 1.4

### clutter_actor_get_constraint ()

    ClutterConstraint * clutter_actor_get_constraint        (ClutterActor *self,
                                                             const gchar *name);

Retrieves the ClutterConstraint with the given name in the list of constraints applied to `self`

`self` : | a ClutterActor
`name` : | the name of the constraint to retrieve
Returns : | a ClutterConstraint for the given name, or `NULL`. The returned ClutterConstraint is owned by the actor and it should not be unreferenced directly. [transfer none]

Since 1.4

### clutter_actor_clear_constraints ()

    void                clutter_actor_clear_constraints     (ClutterActor *self);

Clears the list of constraints applied to `self`

`self` : | a ClutterActor

Since 1.4

### clutter_actor_add_effect ()

    void                clutter_actor_add_effect            (ClutterActor *self,
                                                             ClutterEffect *effect);

Adds `effect` to the list of ClutterEffects applied to `self`

The ClutterActor will hold a reference on the `effect` until either `clutter_actor_remove_effect()` or `clutter_actor_clear_effects()` is called.

`self` : | a ClutterActor
`effect` : | a ClutterEffect

Since 1.4

### clutter_actor_add_effect_with_name ()

    void                clutter_actor_add_effect_with_name  (ClutterActor *self,
                                                             const gchar *name,
                                                             ClutterEffect *effect);

A convenience function for setting the name of a ClutterEffect while adding it to the list of effectss applied to `self`

This function is the logical equivalent of:

    1
    2

    clutter_actor_meta_set_name (CLUTTER_ACTOR_META (effect), name);
    clutter_actor_add_effect (self, effect);

`self` : | a ClutterActor
`name` : | the name to set on the effect
`effect` : | a ClutterEffect

Since 1.4

### clutter_actor_remove_effect ()

    void                clutter_actor_remove_effect         (ClutterActor *self,
                                                             ClutterEffect *effect);

Removes `effect` from the list of effects applied to `self`

The reference held by `self` on the ClutterEffect will be released

`self` : | a ClutterActor
`effect` : | a ClutterEffect

Since 1.4

### clutter_actor_remove_effect_by_name ()

    void                clutter_actor_remove_effect_by_name (ClutterActor *self,
                                                             const gchar *name);

Removes the ClutterEffect with the given name from the list of effects applied to `self`

`self` : | a ClutterActor
`name` : | the name of the effect to remove

Since 1.4

### clutter_actor_get_effects ()

    GList *             clutter_actor_get_effects           (ClutterActor *self);

Retrieves the ClutterEffects applied on `self`, if any

`self` : | a ClutterActor
Returns : | a list of ClutterEffects, or `NULL`. The elements of the returned list are owned by Clutter and they should not be freed. You should free the returned list using `g_list_free()` when done. [transfer container][element-type Clutter.Effect]

Since 1.4

### clutter_actor_get_effect ()

    ClutterEffect *     clutter_actor_get_effect            (ClutterActor *self,
                                                             const gchar *name);

Retrieves the ClutterEffect with the given name in the list of effects applied to `self`

`self` : | a ClutterActor
`name` : | the name of the effect to retrieve
Returns : | a ClutterEffect for the given name, or `NULL`. The returned ClutterEffect is owned by the actor and it should not be unreferenced directly. [transfer none]

Since 1.4

### clutter_actor_clear_effects ()

    void                clutter_actor_clear_effects         (ClutterActor *self);

Clears the list of effects applied to `self`

`self` : | a ClutterActor

Since 1.4

### struct ClutterActorBox

    struct ClutterActorBox {
      gfloat x1;
      gfloat y1;

      gfloat x2;
      gfloat y2;
    };

Bounding box of an actor. The coordinates of the top left and right bottom corners of an actor. The coordinates of the two points are expressed in pixels with sub-pixel precision

gfloat `x1`; | X coordinate of the top left corner
gfloat `y1`; | Y coordinate of the top left corner
gfloat `x2`; | X coordinate of the bottom right corner
gfloat `y2`; | Y coordinate of the bottom right corner

### clutter_actor_box_new ()

    ClutterActorBox *   clutter_actor_box_new               (gfloat x_1,
                                                             gfloat y_1,
                                                             gfloat x_2,
                                                             gfloat y_2);

Allocates a new ClutterActorBox using the passed coordinates for the top left and bottom right points

`x_1` : | X coordinate of the top left point
`y_1` : | Y coordinate of the top left point
`x_2` : | X coordinate of the bottom right point
`y_2` : | Y coordinate of the bottom right point
Returns : | the newly allocated ClutterActorBox. Use `clutter_actor_box_free()` to free the resources

Since 1.0

### clutter_actor_box_copy ()

    ClutterActorBox *   clutter_actor_box_copy              (const ClutterActorBox *box);

Copies `box`

`box` : | a ClutterActorBox
Returns : | a newly allocated copy of ClutterActorBox. Use `clutter_actor_box_free()` to free the allocated resources

Since 1.0

### clutter_actor_box_free ()

    void                clutter_actor_box_free              (ClutterActorBox *box);

Frees a ClutterActorBox allocated using `clutter_actor_box_new()` or `clutter_actor_box_copy()`

`box` : | a ClutterActorBox

Since 1.0

### clutter_actor_box_equal ()

    gboolean            clutter_actor_box_equal             (const ClutterActorBox *box_a,
                                                             const ClutterActorBox *box_b);

Checks `box_a` and `box_b` for equality

`box_a` : | a ClutterActorBox
`box_b` : | a ClutterActorBox
Returns : | `TRUE` if the passed ClutterActorBox are equal

Since 1.0

### clutter_actor_box_get_x ()

    gfloat              clutter_actor_box_get_x             (const ClutterActorBox *box);

Retrieves the X coordinate of the origin of `box`

`box` : | a ClutterActorBox
Returns : | the X coordinate of the origin

Since 1.0

### clutter_actor_box_get_y ()

    gfloat              clutter_actor_box_get_y             (const ClutterActorBox *box);

Retrieves the Y coordinate of the origin of `box`

`box` : | a ClutterActorBox
Returns : | the Y coordinate of the origin

Since 1.0

### clutter_actor_box_get_width ()

    gfloat              clutter_actor_box_get_width         (const ClutterActorBox *box);

Retrieves the width of the `box`

`box` : | a ClutterActorBox
Returns : | the width of the box

Since 1.0

### clutter_actor_box_get_height ()

    gfloat              clutter_actor_box_get_height        (const ClutterActorBox *box);

Retrieves the height of the `box`

`box` : | a ClutterActorBox
Returns : | the height of the box

Since 1.0

### clutter_actor_box_set_origin ()

    void                clutter_actor_box_set_origin        (ClutterActorBox *box,
                                                             gfloat x,
                                                             gfloat y);

Changes the origin of `box`, maintaining the size of the ClutterActorBox.

`box` : | a ClutterActorBox
`x` : | the X coordinate of the new origin
`y` : | the Y coordinate of the new origin

Since 1.6

### clutter_actor_box_get_origin ()

    void                clutter_actor_box_get_origin        (const ClutterActorBox *box,
                                                             gfloat *x,
                                                             gfloat *y);

Retrieves the origin of `box`

`box` : | a ClutterActorBox
`x` : | return location for the X coordinate, or `NULL`. [out][allow-none]
`y` : | return location for the Y coordinate, or `NULL`. [out][allow-none]

Since 1.0

### clutter_actor_box_set_size ()

    void                clutter_actor_box_set_size          (ClutterActorBox *box,
                                                             gfloat width,
                                                             gfloat height);

Sets the size of `box`, maintaining the origin of the ClutterActorBox.

`box` : | a ClutterActorBox
`width` : | the new width
`height` : | the new height

Since 1.6

### clutter_actor_box_get_size ()

    void                clutter_actor_box_get_size          (const ClutterActorBox *box,
                                                             gfloat *width,
                                                             gfloat *height);

Retrieves the size of `box`

`box` : | a ClutterActorBox
`width` : | return location for the width, or `NULL`. [out][allow-none]
`height` : | return location for the height, or `NULL`. [out][allow-none]

Since 1.0

### clutter_actor_box_get_area ()

    gfloat              clutter_actor_box_get_area          (const ClutterActorBox *box);

Retrieves the area of `box`

`box` : | a ClutterActorBox
Returns : | the area of a ClutterActorBox, in pixels

Since 1.0

### clutter_actor_box_contains ()

    gboolean            clutter_actor_box_contains          (const ClutterActorBox *box,
                                                             gfloat x,
                                                             gfloat y);

Checks whether a point with `x`, `y` coordinates is contained withing `box`

`box` : | a ClutterActorBox
`x` : | X coordinate of the point
`y` : | Y coordinate of the point
Returns : | `TRUE` if the point is contained by the ClutterActorBox

Since 1.0

### clutter_actor_box_from_vertices ()

    void                clutter_actor_box_from_vertices     (ClutterActorBox *box,
                                                             const ClutterVertex verts[]);

Calculates the bounding box represented by the four vertices; for details of the vertex array see `clutter_actor_get_abs_allocation_vertices()`.

`box` : | a ClutterActorBox
`verts` : | array of four ClutterVertex. [array fixed-size=4]

Since 1.0

### clutter_actor_box_clamp_to_pixel ()

    void                clutter_actor_box_clamp_to_pixel    (ClutterActorBox *box);

Clamps the components of `box` to the nearest integer

`box` : | the ClutterActorBox to clamp. [inout]

Since 1.2

### clutter_actor_box_interpolate ()

    void                clutter_actor_box_interpolate       (const ClutterActorBox *initial,
                                                             const ClutterActorBox *final,
                                                             gdouble progress,
                                                             ClutterActorBox *result);

Interpolates between `initial` and `final` ClutterActorBoxes using `progress`

`initial` : | the initial ClutterActorBox
`final` : | the final ClutterActorBox
`progress` : | the interpolation progress
`result` : | return location for the interpolation. [out]

Since 1.2

### clutter_actor_box_union ()

    void                clutter_actor_box_union             (const ClutterActorBox *a,
                                                             const ClutterActorBox *b,
                                                             ClutterActorBox *result);

Unions the two boxes `a` and `b` and stores the result in `result`.

`a` : | (in) the first ClutterActorBox
`b` : | the second ClutterActorBox. [in]
`result` : | the ClutterActorBox representing a union of `a` and `b`. [out]

Since 1.4

### struct ClutterVertex

    struct ClutterVertex {
      gfloat x;
      gfloat y;
      gfloat z;
    };

Vertex of an actor in 3D space, expressed in pixels

gfloat `x`; | X coordinate of the vertex
gfloat `y`; | Y coordinate of the vertex
gfloat `z`; | Z coordinate of the vertex

Since 0.4

### clutter_vertex_new ()

    ClutterVertex *     clutter_vertex_new                  (gfloat x,
                                                             gfloat y,
                                                             gfloat z);

Creates a new ClutterVertex for the point in 3D space identified by the 3 coordinates `x`, `y`, `z`

`x` : | X coordinate
`y` : | Y coordinate
`z` : | Z coordinate
Returns : | the newly allocate ClutterVertex. Use `clutter_vertex_free()` to free the resources

Since 1.0

### clutter_vertex_copy ()

    ClutterVertex *     clutter_vertex_copy                 (const ClutterVertex *vertex);

Copies `vertex`

`vertex` : | a ClutterVertex
Returns : | a newly allocated copy of ClutterVertex. Use `clutter_vertex_free()` to free the allocated resources

Since 1.0

### clutter_vertex_free ()

    void                clutter_vertex_free                 (ClutterVertex *vertex);

Frees a ClutterVertex allocated using `clutter_vertex_copy()`

`vertex` : | a ClutterVertex

Since 1.0

### clutter_vertex_equal ()

    gboolean            clutter_vertex_equal                (const ClutterVertex *vertex_a,
                                                             const ClutterVertex *vertex_b);

Compares `vertex_a` and `vertex_b` for equality

`vertex_a` : | a ClutterVertex
`vertex_b` : | a ClutterVertex
Returns : | `TRUE` if the passed ClutterVertex are equal

Since 1.0

### struct ClutterGeometry

    struct ClutterGeometry {
      gint   x;
      gint   y;
      guint  width;
      guint  height;
    };

The rectangle containing an actor's bounding box, measured in pixels.

gint `x`; | X coordinate of the top left corner of an actor
gint `y`; | Y coordinate of the top left corner of an actor
guint `width`; | width of an actor
guint `height`; | height of an actor

### clutter_geometry_union ()

    void                clutter_geometry_union              (const ClutterGeometry *geometry_a,
                                                             const ClutterGeometry *geometry_b,
                                                             ClutterGeometry *result);

Find the union of two rectangles represented as ClutterGeometry.

`geometry_a` : | a ClutterGeometry
`geometry_b` : | another ClutterGeometry
`result` : | location to store the result. [out]

Since 1.4

### clutter_geometry_intersects ()

    gboolean            clutter_geometry_intersects         (const ClutterGeometry *geometry0,
                                                             const ClutterGeometry *geometry1);

Determines if `geometry0` and geometry1 intersect returning `TRUE` if they do else `FALSE`.

`geometry0` : | The first geometry to test
`geometry1` : | The second geometry to test
Returns : | `TRUE` of `geometry0` and geometry1 intersect else `FALSE`.

Since 1.4

### ClutterPaintVolume

    typedef struct _ClutterPaintVolume ClutterPaintVolume;

ClutterPaintVolume is an opaque structure whose members cannot be directly accessed.

A ClutterPaintVolume represents an a bounding volume whos internal representation isn't defined but can be set and queried in terms of an axis aligned bounding box.

Other internal representation and methods for describing the bounding volume may be added in the future.

Since 1.4

### clutter_paint_volume_copy ()

    ClutterPaintVolume * clutter_paint_volume_copy          (const ClutterPaintVolume *pv);

Copies `pv` into a new ClutterPaintVolume

`pv` : | a ClutterPaintVolume
Returns : | a newly allocated copy of a ClutterPaintVolume

Since 1.6

### clutter_paint_volume_free ()

    void                clutter_paint_volume_free           (ClutterPaintVolume *pv);

Frees the resources allocated by `pv`

`pv` : | a ClutterPaintVolume

Since 1.6

### clutter_paint_volume_set_origin ()

    void                clutter_paint_volume_set_origin     (ClutterPaintVolume *pv,
                                                             const ClutterVertex *origin);

Sets the origin of the paint volume.

The origin is defined as the X, Y and Z coordinates of the top-left corner of an actor's paint volume, in actor coordinates.

The default is origin is assumed at: (0, 0, 0)

`pv` : | a ClutterPaintVolume
`origin` : | a ClutterVertex

Since 1.6

### clutter_paint_volume_get_origin ()

    void                clutter_paint_volume_get_origin     (const ClutterPaintVolume *pv,
                                                             ClutterVertex *vertex);

Retrieves the origin of the ClutterPaintVolume.

`pv` : | a ClutterPaintVolume
`vertex` : | the return location for a ClutterVertex. [out]

Since 1.6

### clutter_paint_volume_set_width ()

    void                clutter_paint_volume_set_width      (ClutterPaintVolume *pv,
                                                             gfloat width);

Sets the width of the paint volume. The width is measured along the x axis in the actor coordinates that `pv` is associated with.

`pv` : | a ClutterPaintVolume
`width` : | the width of the paint volume, in pixels

Since 1.6

### clutter_paint_volume_get_width ()

    gfloat              clutter_paint_volume_get_width      (const ClutterPaintVolume *pv);

Retrieves the width of the volume's, axis aligned, bounding box.

In other words; this takes into account what actor's coordinate space `pv` belongs too and conceptually fits an axis aligned box around the volume. It returns the size of that bounding box as measured along the x-axis.

### Note

If, for example, `clutter_actor_get_transformed_paint_volume()` is used to transform a 2D child actor that is 100px wide, 100px high and 0px deep into container coordinates then the width might not simply be 100px if the child actor has a 3D rotation applied to it.

Remember; after `clutter_actor_get_transformed_paint_volume()` is used then a transformed child volume will be defined relative to the ancestor container actor and so a 2D child actor can have a 3D bounding volume.

### Note

There are no accuracy guarantees for the reported width, except that it must always be >= to the true width. This is because actors may report simple, loose fitting paint-volumes for efficiency

`pv` : | a ClutterPaintVolume
Returns : | the width, in units of `pv`'s local coordinate system.

Since 1.6

### clutter_paint_volume_set_height ()

    void                clutter_paint_volume_set_height     (ClutterPaintVolume *pv,
                                                             gfloat height);

Sets the height of the paint volume. The height is measured along the y axis in the actor coordinates that `pv` is associated with.

`pv` : | a ClutterPaintVolume
`height` : | the height of the paint volume, in pixels

Since 1.6

### clutter_paint_volume_get_height ()

    gfloat              clutter_paint_volume_get_height     (const ClutterPaintVolume *pv);

Retrieves the height of the volume's, axis aligned, bounding box.

In other words; this takes into account what actor's coordinate space `pv` belongs too and conceptually fits an axis aligned box around the volume. It returns the size of that bounding box as measured along the y-axis.

### Note

If, for example, `clutter_actor_get_transformed_paint_volume()` is used to transform a 2D child actor that is 100px wide, 100px high and 0px deep into container coordinates then the height might not simply be 100px if the child actor has a 3D rotation applied to it.

Remember; after `clutter_actor_get_transformed_paint_volume()` is used then a transformed child volume will be defined relative to the ancestor container actor and so a 2D child actor can have a 3D bounding volume.

### Note

There are no accuracy guarantees for the reported height, except that it must always be >= to the true height. This is because actors may report simple, loose fitting paint-volumes for efficiency

`pv` : | a ClutterPaintVolume
Returns : | the height, in units of `pv`'s local coordinate system.

Since 1.6

### clutter_paint_volume_set_depth ()

    void                clutter_paint_volume_set_depth      (ClutterPaintVolume *pv,
                                                             gfloat depth);

Sets the depth of the paint volume. The depth is measured along the z axis in the actor coordinates that `pv` is associated with.

`pv` : | a ClutterPaintVolume
`depth` : | the depth of the paint volume, in pixels

Since 1.6

### clutter_paint_volume_get_depth ()

    gfloat              clutter_paint_volume_get_depth      (const ClutterPaintVolume *pv);

Retrieves the depth of the volume's, axis aligned, bounding box.

In other words; this takes into account what actor's coordinate space `pv` belongs too and conceptually fits an axis aligned box around the volume. It returns the size of that bounding box as measured along the z-axis.

### Note

If, for example, `clutter_actor_get_transformed_paint_volume()` is used to transform a 2D child actor that is 100px wide, 100px high and 0px deep into container coordinates then the depth might not simply be 0px if the child actor has a 3D rotation applied to it.

Remember; after `clutter_actor_get_transformed_paint_volume()` is used then the transformed volume will be defined relative to the container actor and in container coordinates a 2D child actor can have a 3D bounding volume.

### Note

There are no accuracy guarantees for the reported depth, except that it must always be >= to the true depth. This is because actors may report simple, loose fitting paint-volumes for efficiency.

`pv` : | a ClutterPaintVolume
Returns : | the depth, in units of `pv`'s local coordinate system.

Since 1.6

### clutter_paint_volume_set_from_allocation ()

    gboolean            clutter_paint_volume_set_from_allocation
                                                            (ClutterPaintVolume *pv,
                                                             ClutterActor *actor);

Sets the ClutterPaintVolume from the allocation of `actor`.

This function should be used when overriding the ``get_paint_volume()`` by ClutterActor sub-classes that do not paint outside their allocation.

A typical example is:

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    static gboolean
    my_actor_get_paint_volume (ClutterActor       *self,
                               ClutterPaintVolume *volume)
    {
      return clutter_paint_volume_set_from_allocation (volume, self);
    }

`pv` : | a ClutterPaintVolume
`actor` : | a ClutterActor
Returns : | `TRUE` if the paint volume was successfully set, and `FALSE` otherwise

Since 1.6

### clutter_paint_volume_union ()

    void                clutter_paint_volume_union          (ClutterPaintVolume *pv,
                                                             const ClutterPaintVolume *another_pv);

Updates the geometry of `pv` to encompass `pv` and `another_pv`.

### Note

There are no guarantees about how precisely the two volumes will be encompassed.

`pv` : | The first ClutterPaintVolume and destination for resulting union
`another_pv` : | A second ClutterPaintVolume to union with `pv`

Since 1.6

## Property Details

### The `"actions"` property

      "actions"                  ClutterAction*        : Write

Adds a ClutterAction to the actor

Since 1.4

### The `"allocation"` property

      "allocation"               ClutterActorBox*      : Read

The allocation for the actor, in pixels

This is property is read-only, but you might monitor it to know when an actor moves or resizes

Since 0.8

### The `"anchor-gravity"` property

      "anchor-gravity"           ClutterGravity        : Read / Write

The anchor point expressed as a ClutterGravity

Default value: CLUTTER_GRAVITY_NONE

Since 1.0

### The `"anchor-x"` property

      "anchor-x"                 gfloat                : Read / Write

The X coordinate of an actor's anchor point, relative to the actor coordinate space, in pixels

Default value: 0

Since 0.8

### The `"anchor-y"` property

      "anchor-y"                 gfloat                : Read / Write

The Y coordinate of an actor's anchor point, relative to the actor coordinate space, in pixels

Default value: 0

Since 0.8

### The `"clip"` property

      "clip"                     ClutterGeometry*      : Read / Write

The clip region for the actor, in actor-relative coordinates

Every part of the actor outside the clip region will not be painted

### The `"clip-to-allocation"` property

      "clip-to-allocation"       gboolean              : Read / Write

Whether the clip region should track the allocated area of the actor.

This property is ignored if a clip area has been explicitly set using `clutter_actor_set_clip()`.

Default value: FALSE

Since 1.0

### The `"constraints"` property

      "constraints"              ClutterConstraint*    : Write

Adds a ClutterConstraint to the actor

Since 1.4

### The `"depth"` property

      "depth"                    gfloat                : Read / Write

The position of the actor on the Z axis

Default value: 0

Since 0.6

### The `"effect"` property

      "effect"                   ClutterEffect*        : Write

Adds ClutterEffect to the list of effects be applied on a ClutterActor

Since 1.4

### The `"fixed-position-set"` property

      "fixed-position-set"       gboolean              : Read / Write

This flag controls whether the "fixed-x" and "fixed-y" properties are used

Default value: FALSE

Since 0.8

### The `"fixed-x"` property

      "fixed-x"                  gfloat                : Read / Write

The fixed X position of the actor in pixels.

Writing this property sets "fixed-position-set" property as well, as a side effect

Default value: 0

Since 0.8

### The `"fixed-y"` property

      "fixed-y"                  gfloat                : Read / Write

The fixed Y position of the actor in pixels.

Writing this property sets the "fixed-position-set" property as well, as a side effect

Default value: 0

Since 0.8

### The `"has-clip"` property

      "has-clip"                 gboolean              : Read

Whether the actor has the "clip" property set or not

Default value: FALSE

### The `"has-pointer"` property

      "has-pointer"              gboolean              : Read

Whether the actor contains the pointer of a ClutterInputDevice or not.

Default value: FALSE

Since 1.2

### The `"height"` property

      "height"                   gfloat                : Read / Write

Height of the actor (in pixels). If written, forces the minimum and natural size request of the actor to the given height. If read, returns the allocated height if available, otherwise the height request.

Allowed values: >= 0

Default value: 0

### The `"mapped"` property

      "mapped"                   gboolean              : Read

Whether the actor is mapped (will be painted when the stage to which it belongs is mapped)

Default value: FALSE

Since 1.0

### The `"min-height"` property

      "min-height"               gfloat                : Read / Write

A forced minimum height request for the actor, in pixels

Writing this property sets the "min-height-set" property as well, as a side effect. This property overrides the usual height request of the actor.

Allowed values: >= 0

Default value: 0

Since 0.8

### The `"min-height-set"` property

      "min-height-set"           gboolean              : Read / Write

This flag controls whether the "min-height" property is used

Default value: FALSE

Since 0.8

### The `"min-width"` property

      "min-width"                gfloat                : Read / Write

A forced minimum width request for the actor, in pixels

Writing this property sets the "min-width-set" property as well, as a side effect.

This property overrides the usual width request of the actor.

Allowed values: >= 0

Default value: 0

Since 0.8

### The `"min-width-set"` property

      "min-width-set"            gboolean              : Read / Write

This flag controls whether the "min-width" property is used

Default value: FALSE

Since 0.8

### The `"name"` property

      "name"                     gchar*                : Read / Write

The name of the actor

Default value: NULL

Since 0.2

### The `"natural-height"` property

      "natural-height"           gfloat                : Read / Write

A forced natural height request for the actor, in pixels

Writing this property sets the "natural-height-set" property as well, as a side effect. This property overrides the usual height request of the actor

Allowed values: >= 0

Default value: 0

Since 0.8

### The `"natural-height-set"` property

      "natural-height-set"       gboolean              : Read / Write

This flag controls whether the "natural-height" property is used

Default value: FALSE

Since 0.8

### The `"natural-width"` property

      "natural-width"            gfloat                : Read / Write

A forced natural width request for the actor, in pixels

Writing this property sets the "natural-width-set" property as well, as a side effect. This property overrides the usual width request of the actor

Allowed values: >= 0

Default value: 0

Since 0.8

### The `"natural-width-set"` property

      "natural-width-set"        gboolean              : Read / Write

This flag controls whether the "natural-width" property is used

Default value: FALSE

Since 0.8

### The `"offscreen-redirect"` property

      "offscreen-redirect"       ClutterOffscreenRedirect  : Read / Write

Determines the conditions in which the actor will be redirected to an offscreen framebuffer while being painted. For example this can be used to cache an actor in a framebuffer or for improved handling of transparent actors. See `clutter_actor_set_offscreen_redirect()` for details.

Since 1.8

### The `"opacity"` property

      "opacity"                  guint                 : Read / Write

Opacity of an actor, between 0 (fully transparent) and 255 (fully opaque)

Allowed values: <= 255

Default value: 255

### The `"reactive"` property

      "reactive"                 gboolean              : Read / Write

Whether the actor is reactive to events or not

Only reactive actors will emit event-related signals

Default value: FALSE

Since 0.6

### The `"realized"` property

      "realized"                 gboolean              : Read

Whether the actor has been realized

Default value: FALSE

Since 1.0

### The `"request-mode"` property

      "request-mode"             ClutterRequestMode    : Read / Write

Request mode for the ClutterActor. The request mode determines the type of geometry management used by the actor, either height for width (the default) or width for height.

For actors implementing height for width, the parent container should get the preferred width first, and then the preferred height for that width.

For actors implementing width for height, the parent container should get the preferred height first, and then the preferred width for that height.

For instance:

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    ClutterRequestMode mode;
    gfloat natural_width, min_width;
    gfloat natural_height, min_height;
    mode = clutter_actor_get_request_mode (child);
    if (mode == CLUTTER_REQUEST_HEIGHT_FOR_WIDTH)
      {
        clutter_actor_get_preferred_width (child, -1,
                                           &min_width,
                                           &natural_width);
        clutter_actor_get_preferred_height (child, natural_width,
                                            &min_height,
                                            &natural_height);
      }
    else
      {
        clutter_actor_get_preferred_height (child, -1,
                                            &min_height,
                                            &natural_height);
        clutter_actor_get_preferred_width (child, natural_height,
                                           &min_width,
                                           &natural_width);
      }

will retrieve the minimum and natural width and height depending on the preferred request mode of the ClutterActor "child".

The `clutter_actor_get_preferred_size()` function will implement this check for you.

Default value: CLUTTER_REQUEST_HEIGHT_FOR_WIDTH

Since 0.8

### The `"rotation-angle-x"` property

      "rotation-angle-x"         gdouble               : Read / Write

The rotation angle on the X axis

Default value: 0

Since 0.6

### The `"rotation-angle-y"` property

      "rotation-angle-y"         gdouble               : Read / Write

The rotation angle on the Y axis

Default value: 0

Since 0.6

### The `"rotation-angle-z"` property

      "rotation-angle-z"         gdouble               : Read / Write

The rotation angle on the Z axis

Default value: 0

Since 0.6

### The `"rotation-center-x"` property

      "rotation-center-x"        ClutterVertex*        : Read / Write

The rotation center on the X axis.

Since 0.6

### The `"rotation-center-y"` property

      "rotation-center-y"        ClutterVertex*        : Read / Write

The rotation center on the Y axis.

Since 0.6

### The `"rotation-center-z"` property

      "rotation-center-z"        ClutterVertex*        : Read / Write

The rotation center on the Z axis.

Since 0.6

### The `"rotation-center-z-gravity"` property

      "rotation-center-z-gravity" ClutterGravity        : Read / Write

The rotation center on the Z axis expressed as a ClutterGravity.

Default value: CLUTTER_GRAVITY_NONE

Since 1.0

### The `"scale-center-x"` property

      "scale-center-x"           gfloat                : Read / Write

The horizontal center point for scaling

Default value: 0

Since 1.0

### The `"scale-center-y"` property

      "scale-center-y"           gfloat                : Read / Write

The vertical center point for scaling

Default value: 0

Since 1.0

### The `"scale-gravity"` property

      "scale-gravity"            ClutterGravity        : Read / Write

The center point for scaling expressed as a ClutterGravity

Default value: CLUTTER_GRAVITY_NONE

Since 1.0

### The `"scale-x"` property

      "scale-x"                  gdouble               : Read / Write

The horizontal scale of the actor

Allowed values: >= 0

Default value: 1

Since 0.6

### The `"scale-y"` property

      "scale-y"                  gdouble               : Read / Write

The vertical scale of the actor

Allowed values: >= 0

Default value: 1

Since 0.6

### The `"show-on-set-parent"` property

      "show-on-set-parent"       gboolean              : Read / Write

If `TRUE`, the actor is automatically shown when parented.

Calling `clutter_actor_hide()` on an actor which has not been parented will set this property to `FALSE` as a side effect.

Default value: TRUE

Since 0.8

### The `"text-direction"` property

      "text-direction"           ClutterTextDirection  : Read / Write

Direction of the text.

Default value: CLUTTER_TEXT_DIRECTION_LTR

### The `"visible"` property

      "visible"                  gboolean              : Read / Write

Whether the actor is set to be visible or not

See also "mapped"

Default value: FALSE

### The `"width"` property

      "width"                    gfloat                : Read / Write

Width of the actor (in pixels). If written, forces the minimum and natural size request of the actor to the given width. If read, returns the allocated width if available, otherwise the width request.

Allowed values: >= 0

Default value: 0

### The `"x"` property

      "x"                        gfloat                : Read / Write

X coordinate of the actor in pixels. If written, forces a fixed position for the actor. If read, returns the fixed position if any, otherwise the allocation if available, otherwise 0.

Default value: 0

### The `"y"` property

      "y"                        gfloat                : Read / Write

Y coordinate of the actor in pixels. If written, forces a fixed position for the actor. If read, returns the fixed position if any, otherwise the allocation if available, otherwise 0.

Default value: 0

## Signal Details

### The `"allocation-changed"` signal

    void                user_function                      (ClutterActor          *actor,
                                                            ClutterActorBox       *box,
                                                            ClutterAllocationFlags flags,
                                                            gpointer               user_data)      : Run Last

The ::allocation-changed signal is emitted when the "allocation" property changes. Usually, application code should just use the notifications for the :allocation property but if you want to track the allocation flags as well, for instance to know whether the absolute origin of `actor` changed, then you might want use this signal instead.

`actor` : | the ClutterActor that emitted the signal
`box` : | a ClutterActorBox with the new allocation
`flags` : | ClutterAllocationFlags for the allocation
`user_data` : | user data set when the signal handler was connected.

Since 1.0

### The `"button-press-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::button-press-event signal is emitted each time a mouse button is pressed on `actor`.

`actor` : | the actor which received the event
`event` : | a ClutterButtonEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"button-release-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::button-release-event signal is emitted each time a mouse button is released on `actor`.

`actor` : | the actor which received the event
`event` : | a ClutterButtonEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"captured-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::captured-event signal is emitted when an event is captured by Clutter. This signal will be emitted starting from the top-level container (the ClutterStage) to the actor which received the event going down the hierarchy. This signal can be used to intercept every event before the specialized events (like ClutterActor::button-press-event or ::key-released-event) are emitted.

`actor` : | the actor which received the signal
`event` : | a ClutterEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"destroy"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : No Hooks

The ::destroy signal notifies that all references held on the actor which emitted it should be released.

The ::destroy signal should be used by all holders of a reference on `actor`.

This signal might result in the finalization of the ClutterActor if all references are released.

Composite actors and actors implementing the ClutterContainer interface should override the default implementation of the class handler of this signal and call `clutter_actor_destroy()` on their children. When overriding the default class handler, it is required to chain up to the parent's implementation.

`actor` : | the ClutterActor which emitted the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.2

### The `"enter-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::enter-event signal is emitted when the pointer enters the `actor`

`actor` : | the actor which the pointer has entered.
`event` : | a ClutterCrossingEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::event signal is emitted each time an event is received by the `actor`. This signal will be emitted on every actor, following the hierarchy chain, until it reaches the top-level container (the ClutterStage).

`actor` : | the actor which received the event
`event` : | a ClutterEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"hide"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run First

The ::hide signal is emitted when an actor is no longer rendered on the stage.

`actor` : | the object which received the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.2

### The `"key-focus-in"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::key-focus-in signal is emitted when `actor` receives key focus.

`actor` : | the actor which now has key focus
`user_data` : | user data set when the signal handler was connected.

Since 0.6

### The `"key-focus-out"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::key-focus-out signal is emitted when `actor` loses key focus.

`actor` : | the actor which now has key focus
`user_data` : | user data set when the signal handler was connected.

Since 0.6

### The `"key-press-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::key-press-event signal is emitted each time a keyboard button is pressed while `actor` has key focus (see `clutter_stage_set_key_focus()`).

`actor` : | the actor which received the event
`event` : | a ClutterKeyEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"key-release-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::key-release-event signal is emitted each time a keyboard button is released while `actor` has key focus (see `clutter_stage_set_key_focus()`).

`actor` : | the actor which received the event
`event` : | a ClutterKeyEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"leave-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::leave-event signal is emitted when the pointer leaves the `actor`.

`actor` : | the actor which the pointer has left
`event` : | a ClutterCrossingEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"motion-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::motion-event signal is emitted each time the mouse pointer is moved over `actor`.

`actor` : | the actor which received the event
`event` : | a ClutterMotionEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"paint"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::paint signal is emitted each time an actor is being painted.

Subclasses of ClutterActor should override the class signal handler and paint themselves in that function.

It is possible to connect a handler to the ::paint signal in order to set up some custom aspect of a paint.

`actor` : | the ClutterActor that received the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.8

### The `"parent-set"` signal

    void                user_function                      (ClutterActor *actor,
                                                            ClutterActor *old_parent,
                                                            gpointer      user_data)       : Run Last

This signal is emitted when the parent of the actor changes.

`actor` : | the object which received the signal
`old_parent` : | the previous parent of the actor, or `NULL`
`user_data` : | user data set when the signal handler was connected.

Since 0.2

### The `"pick"` signal

    void                user_function                      (ClutterActor *actor,
                                                            ClutterColor *color,
                                                            gpointer      user_data)      : Run Last

The ::pick signal is emitted each time an actor is being painted in "pick mode". The pick mode is used to identify the actor during the event handling phase, or by `clutter_stage_get_actor_at_pos()`. The actor should paint its shape using the passed `pick_color`.

Subclasses of ClutterActor should override the class signal handler and paint themselves in that function.

It is possible to connect a handler to the ::pick signal in order to set up some custom aspect of a paint in pick mode.

`actor` : | the ClutterActor that received the signal
`color` : | the ClutterColor to be used when picking
`user_data` : | user data set when the signal handler was connected.

Since 1.0

### The `"queue-redraw"` signal

    void                user_function                      (ClutterActor *actor,
                                                            ClutterActor *origin,
                                                            gpointer      user_data)      : Run Last

The ::queue_redraw signal is emitted when `clutter_actor_queue_redraw()` is called on `origin`.

The default implementation for ClutterActor chains up to the parent actor and queues a redraw on the parent, thus "bubbling" the redraw queue up through the actor graph. The default implementation for ClutterStage queues a `clutter_redraw()` in a main loop idle handler.

Note that the `origin` actor may be the stage, or a container; it does not have to be a leaf node in the actor graph.

Toolkits embedding a ClutterStage which require a redraw and relayout cycle can stop the emission of this signal using the GSignal API, redraw the UI and then call `clutter_redraw()` themselves, like:

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    static void
    on_redraw_complete (void)
    {
      /* execute the Clutter drawing pipeline */
      clutter_redraw ();
    }
    static void
    on_stage_queue_redraw (ClutterStage *stage)
    {
      /* this prevents the default handler to run */
      g_signal_stop_emission_by_name (stage, "queue-redraw");

      /* queue a redraw with the host toolkit and call
       * a function when the redraw has been completed
       */
      queue_a_redraw (G_CALLBACK (on_redraw_complete));
    }

### Note

This signal is emitted before the Clutter paint pipeline is executed. If you want to know when the pipeline has been completed you should connect to the ::paint signal on the Stage with `g_signal_connect_after()`.

`actor` : | the actor we're bubbling the redraw request through
`origin` : | the actor which initiated the redraw request
`user_data` : | user data set when the signal handler was connected.

Since 1.0

### The `"queue-relayout"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::queue_layout signal is emitted when `clutter_actor_queue_relayout()` is called on an actor.

The default implementation for ClutterActor chains up to the parent actor and queues a relayout on the parent, thus "bubbling" the relayout queue up through the actor graph.

The main purpose of this signal is to allow relayout to be propagated properly in the procense of ClutterClone actors. Applications will not normally need to connect to this signal.

`actor` : | the actor being queued for relayout
`user_data` : | user data set when the signal handler was connected.

Since 1.2

### The `"realize"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::realize signal is emitted each time an actor is being realized.

`actor` : | the ClutterActor that received the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.8

### The `"scroll-event"` signal

    gboolean            user_function                      (ClutterActor *actor,
                                                            ClutterEvent *event,
                                                            gpointer      user_data)      : Run Last

The ::scroll-event signal is emitted each time the mouse is scrolled on `actor`

`actor` : | the actor which received the event
`event` : | a ClutterScrollEvent
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the event has been handled by the actor, or `FALSE` to continue the emission.

Since 0.6

### The `"show"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run First

The ::show signal is emitted when an actor is visible and rendered on the stage.

`actor` : | the object which received the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.2

### The `"unrealize"` signal

    void                user_function                      (ClutterActor *actor,
                                                            gpointer      user_data)      : Run Last

The ::unrealize signal is emitted each time an actor is being unrealized.

`actor` : | the ClutterActor that received the signal
`user_data` : | user data set when the signal handler was connected.

Since 0.8