get
Computes the angle (in radians) between the points defined by the given coordinates.
Internally, this method adds π to the value returned by atan2. Therefore, the angle returned by this method is in the range 0 to 2π (inclusive), provided that it is defined.
Return
Angle (in radians) between the points defined by the given coordinates.
Parameters
x1
x-coordinate of the first down motion event that started the fling.
y1
y-coordinate of the first down motion event that started the fling.
x2
x-coordinate of the move motion event that triggered the current onFling.
y2
y-coordinate of the move motion event that triggered the current onFling.