AS3 bitmap data. Blur won't become transparent

1

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,
						  0,0.9,0,0,0,
						  0,0,0.9,0,0,
						  0,0,0,0.6,0]);*/
var cTransform:ColorTransform = new ColorTransform();
cTransform.alphaMultiplier = 0.65;
var gfx:bmGraphic = new bmGraphic();
addChild(gfx);
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);
	bmd.draw(this);
}

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.

2

Something like this?

egg

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.

4

Thanks for landlord’s sharingwe should work together to build this forum as a knowledge-based, professional forum.go to skf Bearing