[Tails]

const dx:Number			= x2 - x1;
const dy:Number			= y2 - y1;
 
var rad:Number			= Math.atan2(dx, dy)
if (rad < 0)
	rad					= Math.PI + (Math.PI - Math.abs(rad));
 
var rotation:Number		= rad * 180 / Math.PI;
 
trace(rotation);