flash on 2016-2-9

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

package {
    import flash.ui.Keyboard;
    import flash.events.KeyboardEvent;
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {
       
           stage.addEventListener(KeyboardEvent.KEY_DOWN,onKdown);
           stage.addEventListener(KeyboardEvent.KEY_UP, onKup);
           stage.addEventListener(Event.ENTER_FRAME, onEnter);     
        }//ctor
        
        public var vecKey:Vector.<Boolean>=new Vector.<Boolean>(512,false);
        public function onKdown(e:KeyboardEvent):void { vecKey[e.keyCode]=true; } 
        public function onKup(e:KeyboardEvent):void { vecKey[e.keyCode]=false; } 
        public function isKey(k:int):Boolean { return vecKey[k]; }
        
        public var tx:int = 8;
        public var ty:int = 8;
        public var gt:int = 0;
        
        public var vecPrev:Vector.<int> = new Vector.<int>(0,false);
        
        public function onEnter(e:Event):void
        {
            gt+=1;
            
            if (gt%4==0)
            {
             var i:int; i = 0;
             if (isKey(Keyboard.UP)) { ty-= 1; i=1; }
             if (isKey(Keyboard.DOWN)) { ty+= 1;i=1; }
             if (isKey(Keyboard.LEFT)) { tx-= 1;i=1; }
             if (isKey(Keyboard.RIGHT)) { tx+= 1;i=1; }
             if (i > 0)
             { vecPrev.push(tx); vecPrev.push(ty); 
               if (vecPrev.length>32) { vecPrev.shift(); vecPrev.shift(); }
             }//endif2
            }//endif
            
            
            
            graphics.clear();
            graphics.lineStyle(2, 0);
            
            graphics.drawCircle(tx*16,ty*16, 16);
            
            var ax:int; var ay:int;
            var num:int;
            num = vecPrev.length;
            for (i=0;i<num;i+=2)
            {
               ax = vecPrev[i];
               ay = vecPrev[i+1]; 
               graphics.drawCircle(ax*16,ay*16, 16);                
            }//nexti
            
            var bx:int; var by:int;
            //bx=tx;by=ty;
            num = vecPrev.length;
            for (i=0;i<num;i+=2)
            {
               ax = vecPrev[i];
               ay = vecPrev[i+1];
               if (i ==0) { bx=ax;by=ay; continue; }             
               graphics.moveTo(ax*16,ay*16);
               graphics.lineTo(bx*16,by*16);
               bx=ax;by=ay;
            }//nexti
            
            
            
        }//onenter
        
    }//classend
}