var ball:Sprite;

var xpos:Number = 0;
var ypos:Number = 0;
var zpos:Number = 0;

var fl:Number =250;
var h:Number = 200;

var vpX:Number = stage.stageWidth / 2;
var vpY:Number = stage.stageHeight / 2;

addEventListener(Event.ENTER_FRAME,onUpdate);
stage.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown);

for(var i:int = -10 ; i <= 10 ; i ++)
{
	for(var j:int = -10 ; j <= 10 ; j ++)
	{
		var c:Class = ApplicationDomain.currentDomain.getDefinition("res.point") as Class;
		var pView:Sprite = new c();
		var p:Point = getBall2DPos(i * 30,0,j * 30);
		pView.x = p.x;
		pView.y = p.y;
		addChild(pView);
	}
}

function onUpdate(e:Event):void
{
	var vy:Number = vpY - stage.mouseY;
	var vx:Number = stage.mouseX - vpX;

	zpos = vy * fl / (h - vy);
	xpos = (fl + zpos) / fl * vx;

	var scale:Number = fl / (fl + zpos);
	ball.scaleX = ball.scaleY = scale;

	var ballP:Point = getBall2DPos(xpos,ypos,zpos);
	ball.x = ballP.x;
	ball.y = ballP.y;
}

function getBall2DPos(xpos:Number,ypos:Number,zpos:Number):Point
{
	var scale:Number = fl / (fl + zpos);
	var p:Point = new Point();
	p.x = vpX + scale * xpos;
	p.y = vpY - ypos - h / (fl + zpos) * zpos;
	return p;
}

function onKeyDown(e:KeyboardEvent):void
{
	if(e.keyCode == Keyboard.UP)
	{
		zpos += 5;
	}
	else if(e.keyCode == Keyboard.DOWN)
	{
		zpos -= 5;
	}
	else if(e.keyCode == Keyboard.A)
	{
		xpos -= 5;
	}
	else if(e.keyCode == Keyboard.D)
	{
		xpos += 5;
	}
}