[AS3] BitmapData.scroll()方法 (捲動點陣圖內容)→ 發射了

scroll()方法
public function scroll(x:int, y:int):void
以一定的 (x, y) 像素量來捲動影像。 捲動區域外圍的邊緣區域維持不變。

BitmapData.colorTransform()

BitmapData.fillRect()

1010102_BitmapData.scroll.swf

var bmd:BitmapData = new BitmapData(550, 400, true, 0xFF0066CC);
var rect:Rectangle = new Rectangle(0, 360, 40, 40);          
var bm:Bitmap = new Bitmap(bmd);
addChild(bm);

var ctf:ColorTransform = new ColorTransform(1, 1, 1, .88);
var rec:Rectangle = new Rectangle(0,0,bmd.width,bmd.height);
var offset:Number = 0;

callTimer(30,18,loop);

function callTimer(_delay:Number, _repeatCount:int, func:Function):void{
var timer:Timer = new Timer(_delay,_repeatCount);
timer.addEventListener(TimerEvent.TIMER,func)
timer.addEventListener(TimerEvent.TIMER_COMPLETE,completeHandler)
timer.start();
}

function loop(event:TimerEvent):void{
offset  += 10;
bmd.colorTransform(rec,ctf);
bmd.scroll(offset, -offset+36); 
bmd.fillRect(rect, 0xFFFFFF00);
}

function completeHandler(event:TimerEvent):void{
event.currentTarget.removeEventListener(TimerEvent.TIMER,loop);
event.currentTarget.removeEventListener(TimerEvent.TIMER_COMPLETE,completeHandler)
offset = 0;
callTimer(30,18,loop);
}