forked from: Rotation math

by Good 24 Oct 2011
Embed
/**
 * Copyright Good ( http://wonderfl.net/user/Good )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/5Hxd
 */

// forked from Good's Rotation math

package  {
    import flash.geom.Point;
    import flash.text.TextFormat;
    import flash.text.TextField;
    import flash.display.Sprite;
    import flash.events.Event;
    [SWF (width=465, height=465)]
    public class M extends Sprite {
        public function M () {
            
            x = y = 465 / 2; 
            
            var tf:TextField = new TextField();
            tf.autoSize = 'left';
            tf.x = tf.y = -200;
            addChild(tf);
            tf.defaultTextFormat = new TextFormat('arial', 11, 0x333333, true);
            
            
            var a:Point = new Point(Math.random() * 100, Math.random() * 100); 
            var b:Point = new Point(Math.random() * 100, Math.random() * 100); 
                         
            addEventListener (Event.ENTER_FRAME, function (e:Event):void {
                
                var c:Point = new Point( mouseX, mouseY );
                
               
                
                var oabRad:Number = Math.atan2(a.x-b.x, a.y-b.y);
                var oacRad:Number = Math.atan2(a.x-c.x, a.y-c.y);
                var bacRad:Number = Math.PI - oabRad + oacRad;
                
                
                
                var cx:Number = Math.cos(bacRad) * Point.distance(a,c);
                
                var xx:Point = b.clone();
               xx.offset(-a.x, -a.y);
                xx.normalize(cx);
                //var xx:Point = Point.polar(cx, -bacRad);
                xx.offset(c.x, c.y);
                
                
                graphics.clear (); 
                graphics.lineStyle (2);
                graphics.moveTo (b.x, b.y);
                graphics.lineTo (a.x, a.y);
                graphics.lineTo(c.x, c.y);
                graphics.lineTo(xx.x, xx.y);
                
                
                var p:Point = Point.polar(50, bacRad-Math.PI)
                
                graphics.moveTo (0,0);
                graphics.lineTo (p.x, p.y);
                
                tf.text = bacRad + '\n' + cx;
            });
        }

    }
}