使用任何注册点坐标绘制显示对象

    public function drawDisplayObjectUsingBounds(source:DisplayObject):BitmapData {
        var bitmapData:BitmapData;//declare a BitmapData
        var bounds:Rectangle = source.getBounds(source);//get the source object actual size
        //round bounds to integer pixel values (to aviod 1px stripes left off)
        bounds = new Rectangle(Math.floor(bounds.x), Math.floor(bounds.y), Math.ceil(bounds.width), Math.ceil(bounds.height));

        //to avoid Invalid BitmapData error which occures if width or height is 0
        //(ArgumentError: Error #2015)
        if((bounds.width>0) && (bounds.height>0)){
            //create a BitmapData
            bitmapData = new BitmapData(bounds.width, bounds.height, true, 0x00000000);                
            var matrix:Matrix = new Matrix();//create a transform matrix
            //translate if to fit the upper-left corner of the source
            matrix.translate(-bounds.x, -bounds.y);
            bitmapData.draw(source, matrix);//draw the source
            return bitmapData;//return the result (exit point)
        }
        //if no result is created - return an empty BitmapData
        return new BitmapData(1, 1, true, 0x00000000);
    }

附注：对于 getBounds() 返回有效值，对象必须至少具有一次阶段访问权限，否则值为伪造。可以添加代码以确保传递的 source 具有阶段，如果不是，则可以将其添加到阶段然后再次移除。