is
Checks if the angle formed between the points defined by the coordinates of the pertinent MotionEvents is indicative of an upward gesture.
An upward gesture is registered if the angle is in [1.25π, 1.75π).
Return
true if the angle formed between the points defined by the coordinates of the pertinent MotionEvents is indicative of an upward gesture.
Parameters
angle
Angle (in radians) formed between the points defined by the coordinates of the pertinent MotionEvents.