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POAS3 BitmapData fillRect with Transparency not working as expected
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  1. POAS3 BitmapData fillRect with Transparency not working as expected
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    copied!<p>I'm trying to use some fillRects on a 32bit BitmapData (i.e. transparency = true and bg color set to FFFF00FF (opaque magenta). For instance I use:</p> <pre><code>fillRect(rect, 0xFF0000FF); </code></pre> <p>This will draw an opaque blue rect, as expected, but ...</p> <pre><code>fillRect(rect, 0x550000FF); </code></pre> <p>This should draw a semi-transparent blue rect, right? But instead I'm getting a dark-blue rect as if the blue is mixed with black (but the background is magenta, remember, so I'd expect the blue gets mixed with the underlying magenta?).</p> <p>If I set the color value to 0x000000FF it should give me the underlying Magenta at 100% but instead I get 100% Black.</p> <p>The BitmapData is created with a 32bit ARGB so I'm wondering what is wrong here?</p> <p>Seems this is default AS3 behavior? After creating a small test class it indeed behaves like I explained ...</p> <pre><code>package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.Sprite; import flash.geom.Rectangle; public class Main extends Sprite { public function Main() { stage.color = 0x000000; var bd:BitmapData = new BitmapData(400, 300, true, 0xFFFF00FF); var b:Bitmap = new Bitmap(bd); addChild(b); bd.fillRect(new Rectangle(0, 0, 200, 200), 0x000000FF); } } } </code></pre> <p>You'd expect the rect drawn with fillRect would be Magenta but it obviously takes the bg color of the stage. Now my question is:</p> <p>Is there a way to get the desired effect (The fillRect alpha applies to the bg color of the bitmapdata, not the Flash stage)?</p>
 

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