建立 DisplayObject 物件 的 Bitmap 替身

包含動態文字的視覺物件常會因為旋轉而消失
在此弄個類別用以建立替身, 由於是點陣資料, 故縮放的時候會比較醜
測試的 Frame Actions :

import lin.shinder.display.Substitute;

var _txt:TextField = new TextField;
_txt.text = "ABCDEF";
this.addChild(_txt);

var s:Substitute = new Substitute(_txt).displace();
s.rotation = 30;

var s_mc:Substitute = new Substitute(t_mc);
s_mc.x = 200;
s_mc.y = 200;
this.addChild(s_mc);

類別檔 Substitute.as :

package lin.shinder.display
{
 import flash.geom.Rectangle;
 import flash.geom.Matrix;
 import flash.display.DisplayObject;
 import flash.display.DisplayObjectContainer;
 import flash.display.Bitmap;
 import flash.display.BitmapData;
 import flash.display.Sprite;
 import flash.display.PixelSnapping;
 // 替身
 dynamic public class Substitute  extends Sprite
 {
  private var bitmap:Bitmap;
  public var bitmapData:BitmapData;
  public var original:DisplayObject;
  
  public function Substitute(disp:DisplayObject)
  {
   original = disp;
   bitmapData = new BitmapData(disp.width, disp.height, true, 0);
   var rect:Rectangle = disp.getBounds(disp);
   var matrix:Matrix = new Matrix;
   matrix.translate(-rect.x, -rect.y);
   bitmapData.draw(disp, matrix);
   bitmap = new Bitmap(bitmapData, PixelSnapping.AUTO, true);
   bitmap.x = rect.x;
   bitmap.y = rect.y;
   this.addChild(bitmap);
   this.visible = original.visible;
   this.x = original.x;
   this.y = original.y;
   this.scaleX = original.scaleX;
   this.scaleY = original.scaleY;
   this.rotation = original.rotation;
  }
  
  public function displace():Substitute
  {
   if(! original.parent) {
    trace('The original DisplayObject is not in display chains !');
    return null;
   }
   var _parent:DisplayObjectContainer = original.parent as DisplayObjectContainer;
   var depth:int = _parent.getChildIndex(original);
   _parent.addChildAt(this, depth);

   _parent.removeChild(original);
   return this;
  }
 }
}

測試範例原始檔