topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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animation-ch08-ChainArray.ax

animation-ch08-ChainArray.ax [swf] [flash] flex 


  package
  {
   import flash.display.Sprite;
   import flash.events.Event;
   
   public class @ax-animation-ch08-ChainArray extends Sprite
   {
    private var balls:Array;
    private var numBalls:Number = 5;
    private var spring:Number = 0.1;
    private var friction:Number = 0.8;
    private var gravity:Number = 5;
    
    public function @ax-animation-ch08-ChainArray()
    {
     init();
    }

init(s) 


    private function init():void
    {
     balls = new Array();
     for(var i:uint = 0; i < numBalls; i++)
     {
      var ball:animation_ch08_Ball = new animation_ch08_Ball(20);
      addChild(ball);
      balls.push(ball);
     }
     addEventListener(Event.ENTER_FRAME, onEnterFrame);
    }

frame(s) 


    private function onEnterFrame(event:Event):void
    {
     graphics.clear();
     graphics.lineStyle(1);
     graphics.moveTo(mouseX, mouseY);
     moveBall(balls[0], mouseX, mouseY);
     graphics.lineTo(balls[0].x, balls[0].y);
     
     for(var i:uint = 1; i < numBalls; i++)
     {
      var ballA:animation_ch08_Ball = balls[i-1];
      var ballB:animation_ch08_Ball = balls[i];
      moveBall(ballB, ballA.x, ballA.y);
      graphics.lineTo(ballB.x, ballB.y);
     }
    }

move(s) 


    private function moveBall(ball:animation_ch08_Ball, targetX:Number, targetY:Number):void
    {
     ball.vx += (targetX - ball.x) * spring;
     ball.vy += (targetY - ball.y) * spring;
     ball.vy += gravity;
     ball.vx *= friction;
     ball.vy *= friction;
     ball.x += ball.vx;
     ball.y += ball.vy;
    }
   }
  }
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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