is
Checks if the angle formed between the points defined by the coordinates of the pertinent MotionEvents is indicative of a left gesture.
A left gesture is registered if the angle is in [0, 0.25π) or [1.75π, 2π).
Return
true if the angle formed between the points defined by the coordinates of the pertinent MotionEvents is indicative of a left gesture.
Parameters
angle
Angle (in radians) formed between the points defined by the coordinates of the pertinent MotionEvents.