Rolling a square: School Of Motion Response

School of motion just had a tutorial about rolling a square.
http://www.schoolofmotion.com/project...
Joey said that he had trouble getting the triganometry to work properly,  so this is how to do it.  be sure to go check out his tutorial, and also the rest of the 30 days of After Effects currently going on right now.  pretty cool stuff.

here is the expression

rot=transform.rotation;
scl=transform.scale[0]/100;
w=(this.width/2)*scl;
r=(degreesToRadians(rot))*2;
t=transform.position;
slider=effect("Slider Control")("Slider");

[t[0]+w*rot/45,t[1]-(Math.abs(slider*Math.sin(r)))*scl];



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