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Thread: AS3 bitmap data. Blur won't become transparent.

  1. #1

    AS3 bitmap data. Blur won't become transparent.

    Hi. I am trying to finally get my head around bitmapdata and filters. I have made a simple flash that has a movieclip of a circle in the library. I add it to the stage and then make it follow the mouse. Then i use it to draw to a bitmap and then apply a blur. The problem is that the blur doesn't become transparent, and eventually fills the whole screen. I've tried using a colorTransform and a ColorMatrixFilter but they don't seem to work.

    Here's the code. What i really want is the blur to gradually become transparent towards the edges, in the way a gaussian blur would work in PS.

    var bmd:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0xFFFFFF);
    var bm:Bitmap = new Bitmap(bmd);
    addChild (bm);
    var bf:BlurFilter = new BlurFilter(6,6,1);
    /*var cmf:ColorMatrixFilter = new ColorMatrixFilter([0.9,0,0,0,0,
    var cTransform:ColorTransform = new ColorTransform();
    cTransform.alphaMultiplier = 0.65;
    var gfx:bmGraphic = new bmGraphic();
    this.addEventListener(Event.ENTER_FRAME, frameHandler);
    function frameHandler(e:Event):void{
    	gfx.x = stage.mouseX - (gfx.width/2);
    	gfx.y = stage.mouseY - (gfx.width/2);
    	bmd.colorTransform(bmd.rect, cTransform);
    	bmd.applyFilter(bmd, bmd.rect, new Point(0,0), bf);
    If anyone can help me that would be great. I feel like i'm missing the point here.

    edit: Oops. Thought i was in the as3 section .... sorry.
    Last edited by Iamthejuggler; May 22nd, 2008 at 06:17 AM.

  2. #2
    Something like this?


  3. #3
    That would be exactly what i wanted, if it wasn't doing the same as mine. Turn the stage to white and you'll see that what looks like transparent is actually just filling the stage with opaque black.

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