Get the historical orientation of the touch area and tool area in radians clockwise from
vertical for the given pointer index that
occurred between this event and the previous motion event.
An angle of 0 degrees indicates that the major axis of contact is oriented
upwards, is perfectly circular or is of unknown orientation. A positive angle
indicates that the major axis of contact is oriented to the right. A negative angle
indicates that the major axis of contact is oriented to the left.
The full range is from -PI/2 radians (finger pointing fully left) to PI/2 radians
(finger pointing fully right).
Get the historical orientation of the touch area and tool area in radians clockwise from vertical for the given pointer index that occurred between this event and the previous motion event. An angle of 0 degrees indicates that the major axis of contact is oriented upwards, is perfectly circular or is of unknown orientation. A positive angle indicates that the major axis of contact is oriented to the right. A negative angle indicates that the major axis of contact is oriented to the left. The full range is from -PI/2 radians (finger pointing fully left) to PI/2 radians (finger pointing fully right).