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Description
GtkGestureRotate is a GtkGesture implementation able to recognize 2-finger rotations, whenever the angle between both handled sequences changes, the “angle-changed” signal is emitted.
Functions
gtk_gesture_rotate_new ()
GtkGesture *
gtk_gesture_rotate_new (GtkWidget *widget);
Returns a newly created GtkGesture that recognizes 2-touch rotation gestures.
Since 3.14
gtk_gesture_rotate_get_angle_delta ()
gdouble
gtk_gesture_rotate_get_angle_delta (GtkGestureRotate *gesture);
If gesture
is active, this function returns the angle difference
in radians since the gesture was first recognized. If gesture
is
not active, 0 is returned.
Since 3.14
Signal Details
The “angle-changed” signal
void user_function (GtkGestureRotate *gesture, gdouble angle, gdouble angle_delta, gpointer user_data)
This signal is emitted when the angle between both tracked points changes.
Parameters
gesture |
the object on which the signal is emitted |
|
angle |
Current angle in radians |
|
angle_delta |
Difference with the starting angle, in radians |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run First
Since 3.14