以動態文字作為遮罩

mmug上討論的問題
在此我用之前的 Substitute 類別來解決

Frame Actions:

// 底
var bmd:BitmapData = new BitmapData(200, 200, true, 0xFFCCCCCC);
var seed:int = int(Math.random() * int.MAX_VALUE);
var channels:uint = BitmapDataChannel.RED | BitmapDataChannel.BLUE;
bmd.perlinNoise(100, 80, 12, seed, false, true, channels, false, null);
var bm:Bitmap = new Bitmap(bmd);
this.addChild(bm);

// 動態文字
var _txt:TextField = new TextField;
_txt.autoSize = "left";
var myTextFormat:TextFormat = new TextFormat(null, 30, 0, true);
_txt.text = "動態文字";
_txt.x = 50;
_txt.setTextFormat(myTextFormat);
this.addChild(_txt);

// 建立替身
import lin.shinder.display.Substitute;
var s:Substitute = new Substitute(_txt).displace();
s.rotation = 30;

// 設定遮罩
bm.cacheAsBitmap = true;
s.cacheAsBitmap = true;
bm.mask = s;

原始檔下載