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getVisibleBounds in AS3

ulfben Dec 7th, 2016 67 Never
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  1. //courtesy of Colin Moock: http://www.moock.org/blog/archives/000292.html
  2. /**
  3.  * Returns the distance from the registration point of the specified
  4.  * object to the bottom-most visible pixel, ignoring any region
  5.  * that is not visible due to masking. For example, if a display
  6.  * object contains a 100-pixel-high shape and a 50-pixel-high mask,
  7.  * getVisibleHeight() will return 50, whereas DisplayObject's
  8.  * "height" variable would yield 100.
  9.  *
  10.  * The maximum measureable dimensions of the supplied object is
  11.  * 2000x2000.
  12.  */
  13. function getVisibleHeight (o:DisplayObject):Number {
  14.     var bitmapDataSize:int = 2000;
  15.     var bounds:Rectangle;
  16.     var bitmapData:BitmapData = new BitmapData(bitmapDataSize, bitmapDataSize, true, 0);
  17.     bitmapData.draw(o);
  18.     bounds = bitmapData.getColorBoundsRect( 0xFF000000, 0x00000000, false );
  19.     bitmapData.dispose();
  20.     return bounds.y + bounds.height;
  21. }
  22. /**
  23. * Returns the distance from the registration point of the specified
  24. * object to the right-most visible pixel, ignoring any region
  25. * that is not visible due to masking. For example, if a display
  26. * object contains a 100-pixel-wide shape and a 50-pixel-wide mask,
  27. * getVisibleWidth() will return 50, whereas DisplayObject's
  28. * "width" variable would yield 100.
  29. *
  30. * The maximum measureable dimensions of the supplied object is
  31. * 2000x2000.
  32. */
  33. function getVisibleWidth (o:DisplayObject):Number {
  34.     var bitmapDataSize:int = 2000;
  35.     var bounds:Rectangle;
  36.     var bitmapData:BitmapData = new BitmapData(bitmapDataSize, bitmapDataSize, true, 0);
  37.     bitmapData.draw(o);
  38.     bounds = bitmapData.getColorBoundsRect( 0xFF000000, 0x00000000, false );
  39.     bitmapData.dispose();
  40.     return bounds.x + bounds.width;
  41. }
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