If the gesture is recognized, this function returns %TRUE and fill in @velocity_x and @velocity_y with the recorded velocity, as per the last event(s) processed.
return value for the velocity in the X axis, in pixels/sec
return value for the velocity in the Y axis, in pixels/sec
whether velocity could be calculated
3.14
See Implementation
If the gesture is recognized, this function returns %TRUE and fill in @velocity_x and @velocity_y with the recorded velocity, as per the last event(s) processed.