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AS3 bitmapData.draw() with Masked DisplayObject

/ Published in: ActionScript 3
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If you need to use bitmapData.draw() method on a DisplayObject that has a mask as a child then it can be awkward getting it to work properly. Using Thomas John's getRealBounds method is a great solution.

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  1. // This code assumes there is a MovieClip on stage with the instance 
  2. // name of 'pattern_mc'. Inside 'pattern_mc' there could be a mask which 
  3. // is masking all the other layers.
  4.  
  5. var bounds:Rectangle = getRealBounds(pattern_mc);
  6. var bmpd:BitmapData = new BitmapData(bounds.width, bounds.height);
  7. var matrix:Matrix = new Matrix();
  8. matrix.translate(-bounds.x, -bounds.y);
  9. bmpd.draw(pattern_mc, matrix, null, null, null, true);
  10. var bmp:Bitmap = new Bitmap(bmpd);
  11.  
  12. bmp.x = 20;
  13. bmp.y = 20;
  14. addChild(bmp);
  15.  
  16.  
  17.  
  18. function getRealBounds(displayObject:DisplayObject):Rectangle
  19. {
  20. 	var bounds:Rectangle;
  21. 	var boundsDispO:Rectangle = displayObject.getBounds( displayObject );
  22.  
  23. 	var bitmapData:BitmapData = new BitmapData( int( boundsDispO.width + 0.5 ), int( boundsDispO.height + 0.5 ), true, 0 );
  24.  
  25. 	var matrix:Matrix = new Matrix();
  26. 	matrix.translate( -boundsDispO.x, -boundsDispO.y);
  27.  
  28. 	bitmapData.draw( displayObject, matrix, new ColorTransform( 1, 1, 1, 1, 255, -255, -255, 255 ) );
  29.  
  30. 	bounds = bitmapData.getColorBoundsRect( 0xFF000000, 0xFF000000 );
  31. 	bounds.x += boundsDispO.x;
  32. 	bounds.y += boundsDispO.y;
  33.  
  34. 	bitmapData.dispose();
  35. 	return bounds;
  36. }

URL: http://blog.open-design.be/2010/01/26/getbounds-on-displayobject-not-functioning-properly/

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