Flash / Actionscript custom alpha blending: Class NandAlphaBlender
- 07-12-2009 @ 20:10
- 3 reacties
Case
For one of our projects we needed a special kind of blending of two sprites: the overlap of two sprites should be hidden whereas the rest should maintain it's original alpha levels. As far as i know, this behavior can not be achieved with regular sprite-blending so some extra logic is needed to generate a new bitmap with this new layout.
Possible solution
One could create a class that generates a new DisplayObject that can be used on stage to simulate this behavior.
I gave it my best shot and you can find a class with that logic here.
Just extract the zip in your Flex / Flash source directory and import the class in your source code. Now call the static function NandAlphaBlender.getBitmap(displayObject1, displayObject2) to get the generated bitmap. The passed DisplayObjects should have the same parent and the returned Bitmap will have the same coordinates as the original images.
The code should look something like this (where circle and rect are sibling displayObjects):
package {
...
import nl.kingsquare.NandAlphaBlender;
...
...
var result:Bitmap = NandAlphaBlender.getBitmap(circle, rect);
addChild(result);
result.x += 200;
...
}And the result should be something like shown above.
It took me quite a while to get a grip on this, so i hope this helps you!
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