Okay I'm aware there's been quite a few questions relating to angles and rotation recently, but I did a search and couldn't find anything regarding this specifically...
<img src="http://dl.dropbox.com/u/53374990/angle%20problem.png" border="0" />
As you probably already know, using the "angle" expression... [angle(x1, y1, x2, y2)] returns an angle based on the circle on the left.. (if x1,y1 was in the centre of the circle)
But my question is how would you go about rotating this? along with the 180 to -180 cut off point?
So if I wanted it to rotate 90 degrees for example, it would give the values shown in the second Circle.
Thanks in advance!