The relative angle is the angle between the X axis and the line
through both events' positions. The rotation direction for positive
angles is from the positive X axis towards the positive Y axis.
This assumes that both events have X/Y information.
If not, this function returns false.
Returns the relative angle from event1 to event2.
The relative angle is the angle between the X axis and the line through both events' positions. The rotation direction for positive angles is from the positive X axis towards the positive Y axis.
This assumes that both events have X/Y information. If not, this function returns false.