by kirupa | 27 June 2015
For a variety of interactive scenarios, you will want to know what direction your mouse is moving in. If you can't think of a good reason for why you would want to know the mouse movement direction, take a look at this classic "game" from many years ago:
This is a companion discussion topic for the original entry at http://www.kirupa.com/html5/getting_mouse_movement_direction.htm