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    GObject
    ╰── GInitiallyUnowned
        ╰── ClutterActorMeta
            ╰── ClutterAction
                ╰── ClutterGestureAction
                    ╰── ClutterZoomAction
ClutterZoomAction is a sub-class of ClutterGestureAction that implements all the necessary logic for zooming actors using a "pinch" gesture between two touch points.
The simplest usage of ClutterZoomAction consists in adding it to a ClutterActor and setting it as reactive; for instance, the following code:
| 1 2 | clutter_actor_add_action (actor, clutter_zoom_action_new ()); clutter_actor_set_reactive (actor, TRUE); | 
will automatically result in the actor to be scale according to the distance between two touch points.
ClutterAction *
clutter_zoom_action_new (void);
Creates a new ClutterZoomAction instance
Since: 1.12
void clutter_zoom_action_set_zoom_axis (ClutterZoomAction *action,ClutterZoomAxis axis);
Restricts the zooming action to a specific axis
Since: 1.12
ClutterZoomAxis
clutter_zoom_action_get_zoom_axis (ClutterZoomAction *action);
Retrieves the axis constraint set by clutter_zoom_action_set_zoom_axis()
Since: 1.12
void clutter_zoom_action_get_focal_point (ClutterZoomAction *action,ClutterPoint *point);
Retrieves the focal point of the current zoom
Since: 1.12
void clutter_zoom_action_get_transformed_focal_point (ClutterZoomAction *action,ClutterPoint *point);
Retrieves the focal point relative to the actor's coordinates of the current zoom
Since: 1.12
struct ClutterZoomAction;
The ClutterZoomAction structure contains only private data and should be accessed using the provided API
Since: 1.12
struct ClutterZoomActionClass {
  gboolean (* zoom)  (ClutterZoomAction *action,
                      ClutterActor      *actor,
                      ClutterPoint      *focal_point,
                      gdouble            factor);
};
The ClutterZoomActionClass structure contains only private data
Since: 1.12
The axis of the constraint that should be applied by the zooming action.
Since: 1.12
“zoom-axis” property“zoom-axis” ClutterZoomAxis
Constraints the zooming action to the specified axis
Flags: Read / Write
Default value: CLUTTER_ZOOM_BOTH
Since: 1.12
“zoom” signalgboolean user_function (ClutterZoomAction *action, ClutterActor *actor, ClutterPoint *focal_point, gdouble factor, gpointer user_data)
The ::zoom signal is emitted for each series of touch events that change the distance and focal point between the touch points.
The default handler of the signal will call
clutter_actor_set_scale() on actor
 using the ratio of the first
distance between the touch points and the current distance. To
override the default behaviour, connect to this signal and return
FALSE.
| action | the ClutterZoomAction that emitted the signal | |
| actor | the ClutterActor attached to the action | |
| focal_point | the focal point of the zoom | |
| factor | the initial distance between the 2 touch points | |
| user_data | user data set when the signal handler was connected. | 
Flags: Run Last
Since: 1.12