flash on 2014-12-31

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

package {
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {

          
          stage.addEventListener(Event.ENTER_FRAME, onEnter);  
        }//ctor

        
        public var cx:Number = 230;
        public var cy:Number = 20;
        public var vx:Number = 0;
        public var vy:Number = 0;

        public var gt:int = 0;
        

        public function onEnter(e:Event):void
        {
            graphics.clear();
            graphics.lineStyle(2, 0);
            
            gt += 1;
            
            var ar:Number;
            var ax:Number; var ay:Number;
            ax = 230; ay = 230; ar = 128;
            graphics.beginFill(0x808080);
            graphics.drawCircle(ax, ay, ar);
            graphics.endFill();

            graphics.drawCircle(cx, cy, 8);
            
            
            var ang:Number;
            ang = Math.atan2(cy-ay, cx-ax);
            graphics.drawCircle(ax,ay,4);
            graphics.moveTo(ax,ay);
            graphics.lineTo(ax+Math.cos(ang)*16, ay+Math.sin(ang)*16);
            
            var nx:Number; var ny:Number;
            nx = Math.cos(ang); ny = Math.sin(ang);
            
            if ((gt & 256) == 0)
            {  vx += -ny*0.2; vy+= nx*0.2; }
            else { vx += ny*0.2; vy+= -nx*0.2;  }
            
            
            vx -= nx;            vy -= ny;
            vx *= 0.95;            vy *= 0.95;
        
          
            
            var d:Number;
            d = getMag(ax-cx, ay-cy);
            if (d <= ar+8) 
            {
             var dot:Number;
             dot = vx*nx + vy*ny; 
             if (dot < 0)
             {
             var px:Number;     var py:Number;
             px = nx*dot;    py = ny*dot;
             vx -=px;  vy -=py; 
             
               if (d-4 < 8)
               {
                 vx += nx;
                 vy += ny;
               } 
             }
            }//endif

            cx += vx; cy += vy;
            
        }//onenter    
        
        public function getMag(ax:Number, ay:Number):Number
        { return Math.sqrt(ax*ax+ay*ay); }
            
        
        
        
        
        
    }//classend
}