Emanuele Aina 436ebb2716 gesture-action: add _get_motion_delta()/_get_velocity()
Add some accessors to simplify common tasks for GestureAction users:

• clutter_gesture_action_get_motion_delta() to get the delta
  on the X and Y axis in stage coordinates since the last motion
  event, and the scalar distance travelled;

• clutter_gesture_action_get_velocity() to get an estimate of the
  speed of the last motion event along the X and Y axis and as a
  scalar value in pixels per millisecond.

https://bugzilla.gnome.org/show_bug.cgi?id=681648
2012-08-28 09:57:33 -03:00
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