How to convert x,y coordinates to an angle?

Question

Microsoft provide an excellent SVG gradient maker so IE9 can also have \"CSS3\" gradients (click Custom).

I currently utilise their logic for my Fireworks and Dreamw

Answer 1

Instead of using Math.tan function You should use Math.atan2:

Here is an example of use:

deltaX = x2 - x1;
deltaY = y2 - y1;
deg = Math.atan2(deltaY, deltaX)*180.0/Math.PI;

and this will return a degree from <-180;180>.