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-ch15-Fireworks.ax

animation-ch15-Fireworks.ax [swf] [flash] flex

package fire work(s)


  package {
   import flash.display.Sprite;
   import flash.display.StageAlign;
   import flash.display.StageScaleMode;
   import flash.events.Event;
   import flash.events.KeyboardEvent;
   import flash.ui.Keyboard;

class


   [SWF(backgroundColor=0x000000)]
   public class @ax-animation-ch15-Fireworks extends Sprite
   {
    private var balls:Array;
    private var numBalls:uint = 100;
    private var fl:Number = 250;
    private var vpX:Number = stage.stageWidth / 2;
    private var vpY:Number = stage.stageHeight / 2;
    private var gravity:Number = 0.2;
    private var floor:Number = 200;
    private var bounce:Number = -0.6;

constructor


    public function @ax-animation-ch15-Fireworks()
    {
     init();
    }

init(s)


    private function init():void
    {
     stage.align = StageAlign.TOP_LEFT;
     stage.scaleMode = StageScaleMode.NO_SCALE;
     
     balls = new Array();

ball(s)


     for(var i:uint = 0; i < numBalls; i++)
     {
      var ball:animation_ch15_Ball3D = new animation_ch15_Ball3D(3, Math.random() * 0xffffff);
      balls.push(ball);
      ball.ypos = -100;
      ball.vx = Math.random() * 6 - 3;
      ball.vy = Math.random() * 6 - 6;
      ball.vz = Math.random() * 6 - 3;
      addChild(ball);
     }
     addEventListener(Event.ENTER_FRAME, onEnterFrame);
    }

animation / frame(s)


    private function onEnterFrame(event:Event):void
    {
     for(var i:uint = 0; i < numBalls; i++)
     {
      var ball:animation_ch15_Ball3D = balls[i];
      move(ball);
     }
     sortZ();
    }

move(s)


    private function move(ball:animation_ch15_Ball3D):void
    {
     var radius:Number =  ball.radius;
     
     ball.vy += gravity;
     ball.xpos += ball.vx;
     ball.ypos += ball.vy;
     ball.zpos += ball.vz;

check y


     if(ball.ypos > floor)
     {
      ball.ypos = floor;
      ball.vy *= bounce;
     }

check z


     if(ball.zpos > -fl)
     {
      var scale:Number = fl / (fl + ball.zpos);
      ball.scaleX = ball.scaleY = scale;
      ball.x = vpX + ball.xpos * scale;
      ball.y = vpY + ball.ypos * scale;
      ball.visible = true;
     }
     else
     {
      ball.visible = false;
     }
    }

sort / Z


    
    private function sortZ():void
    {
     balls.sortOn("zpos", Array.DESCENDING | Array.NUMERIC);
     for(var i:uint = 0; i < numBalls; i++)
     {
      var ball:animation_ch15_Ball3D = balls[i];
      setChildIndex(ball, i);
     }
    }
   }
  }
[] 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

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.