magical 45 degree shift key behavior   

Does anyone know how to mimic the built in behavior that constrains a
1-D shape to 45 degree increments when rotating with shift key
pressed?

Basically I'm trying to force this behavior so the user does not have
to hold down the shift key to insure that the angle is always a
multiple of 45 degrees.

Thanks
Mark

date: Fri, 02 Dec 2005 19:13:50 -0700   author:   Mark