flash on 2015-8-13

/**
 * Copyright mutantleg ( http://wonderfl.net/user/mutantleg )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/iFVW
 */

package {
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {
         
            stage.addEventListener(MouseEvent.MOUSE_DOWN, onMdown);
            stage.addEventListener(MouseEvent.MOUSE_UP, onMup);
            
            stage.addEventListener(Event.ENTER_FRAME, onEnter);
        }//ctor
        
        public function onMdown(e:MouseEvent):void {  mbutton = 1; }
        public function onMup(e:MouseEvent):void { mbutton = 0; }
        
        public var mbutton:int = 0;
        
        public var cx:Number = 230;
        public var cy:Number = 230;
        public var ang:Number = 0;
        
        public var angv:Number = 0;
        
        public function addImpulse(ax:Number, ay:Number, vx:Number, vy:Number):void
        {
            var ta:Number;
              ta = ((ax - cx) * vy) - ((ay - cy) * vx);
              angv += ta * 0.0001; 
              
              graphics.drawCircle(ax, ay, 16);
              graphics.moveTo(ax, ay);
              graphics.lineTo(ax + vx * 16, ay + vy * 16);
             
        }//addimp
        
        public function getDist(ax:Number, ay:Number):Number
        { return Math.sqrt(ax*ax+ay*ay); }
        
        public function onEnter(e:Event):void
        {
            var mx:Number; var my:Number;
            mx = stage.mouseX; my= stage.mouseY;
            
            graphics.clear();
            graphics.lineStyle(2, 0);
          
          
          ang += angv;
          angv *= 0.99;
          
            graphics.drawCircle(cx,cy, 128);
            graphics.moveTo(cx,cy);
            graphics.lineTo(cx+Math.cos(ang)*128, cy+Math.sin(ang)*128);
            
            if (getDist(cx-mx,cy-my)<128)
            { 
             graphics.drawCircle(mx,my,8);
              if (mbutton > 0) {  addImpulse(mx,my, 1, 0); }
            }//endif
            
            
        }//onenter
        
        
    }//classend
}