> From: k...@designdrumm.com
> Subject: Re: [Flashcoders] (no subject)
> Date: Wed, 1 Sep 2010 18:51:38 -0500
> To: flashcoders@chattyfig.figleaf.com
>
> I dont think that setting the alpha to true was your problem.
> It may not be showing anything because it may be making ALL the
> pixels transparent?
I assume that's what's happening, yes, but I don't know how to change that. How
could I set the alpha in
_fire = new BitmapData(865, 92, false, 0xffffff);
to true for *just* certain bitmap data? I don't imagine that's possible, and
therein, I believe, lies my problem.
> Maybe look into that? Also try blendmode overlay. That may help the
> opaque pixels lay over the transparent ones. or vice versa
> I don't have an example per say, but had the same problem with a php
> image creation script I was writing and the blendmode overlay helped
> there.
> May do the same for you.
Yeah, no such luck, Karl. I forgot to mention I tried every combination to see
what would happen. If there were some way I could catch the values, for
example, coming out of this function:
private function _createPalette(idx:int):void {
_redArray = [];
_greenArray = [];
_blueArray = [];
_alphaArray = [];
for (var i:int = 0; i < 256; i++) {
var gp:int = new int();
gp = _fireColor.getPixel(i, 0);
if (gp < 1050112)
{
_redArray.push(255);
_alphaArray.push(255);
} else {
_redArray.push(gp);
_alphaArray.push(0);
}
_greenArray.push(0);
_blueArray.push(0);
}
}
where I catch the values under a certain numeric value in my if statement with
the var gp, then somehow set the alpha of those values to 0 and leave the rest
at alpha=1, I'd be set, but I can't figure out how to do that.
TIA,
George
> On Sep 1, 2010, at 7:15 AM, George Jones wrote:
>
> >
> >
> >
> >
> > Hi;
> > I'm trying to tweak a script I found online to work for my
> > application. The problem I am having is to make a certain part of
> > the bitmap that is created by code transparent...but only a certain
> > part of it. The code has the following:
> >
> > _fire = new BitmapData(865, 92, false, 0xffffff);
> >
> > Note
> > the alpha flag must be set to false, which is the source of my
> > problem,
> > or nothing prints to screen at all. I need to make certain pixels
> > transparent. _fire is added to the stage and then called thus:
> >
> > _fire.paletteMap(_grey, _grey.rect, ZERO_POINT,
> > _redArray, _greenArray, _blueArray, _alphaArray);
> >
> > at the end of the script. The colors for the arrays are created
> > thusly:
> >
> > private function _createPalette(idx:int):void {
> > _redArray = [];
> > _greenArray = [];
> > _blueArray = [];
> > _alphaArray = [];
> > for (var i:int = 0; i < 256; i++) {
> > var gp:int = new int();
> > gp = _fireColor.getPixel(i, 0);
> > if (gp < 1050112)
> > {
> > _redArray.push(255);
> > _alphaArray.push(255);
> > } else {
> > _redArray.push(gp);
> > _alphaArray.push(0);
> > }
> > _greenArray.push(0);
> > _blueArray.push(0);
> > }
> > }
> >
> > I
> > added that if clause to capture when the color is black because
> > that's
> > where I need to make it transparent. The problem is that where I
> > need it
> > to be transparent, it's blue (why blue I don't know). Is there any
> > way
> > to make it transparent? The entire code follows.
> > TIA,
> > George
> >
> >
> >
> > package {
> > import flash.display.Bitmap;
> > import flash.display.BitmapData;
> > import flash.display.BlendMode;
> > import flash.display.DisplayObject;
> > import flash.display.Loader;
> > import flash.display.LoaderInfo;
> > import flash.display.Sprite;
> > import flash.display.StageQuality;
> > import flash.display.StageScaleMode;
> > import flash.events.Event;
> > import flash.events.MouseEvent;
> > import flash.filters.ColorMatrixFilter;
> > import flash.filters.ConvolutionFilter;
> > import flash.geom.ColorTransform;
> > import flash.geom.Point;
> > import flash.system.LoaderContext;
> > import flash.net.SharedObject;
> > import flash.net.URLRequest;
> > import flash.text.TextField;
> > import flash.text.TextFieldAutoSize;
> > import flash.text.TextFormat;
> >
> > [SWF(width=465, height=92, backgroundColor=0xffffff,
> > frameRate=30)]
> >
> > public class Fire extends Sprite {
> >
> > private static const ZERO_POINT:Point = new Point();
> >
> > private var _fireColor:BitmapData;
> > private var _currentFireColor:int;
> >
> > private var _canvas:Sprite;
> > private var _grey:BitmapData;
> > private var _spread:ConvolutionFilter;
> > private var _cooling:BitmapData;
> > private var _color:ColorMatrixFilter;
> > private var _offset:Array;
> > private var _fire:BitmapData;
> > private var _redArray:Array;
> > private var _zeroArray:Array;
> > private var _greenArray:Array;
> > private var _blueArray:Array;
> > private var _alphaArray:Array;
> >
> > public function Fire() {
> > // stage.scaleMode = StageScaleMode.NO_SCALE;
> > // stage.quality = StageQuality.LOW;
> > var loader:Loader = new Loader();
> > loader.contentLoaderInfo.addEventListener
> > (Event.COMPLETE, _onLoaded);
> > loader.load(new URLRequest('images/fire-color.png'),
> > new LoaderContext(true));
> > }
> >
> > private function _onLoaded(e:Event):void {
> > _fireColor = Bitmap(LoaderInfo
> > (e.target).loader.content).bitmapData;
> >
> > _canvas = new Sprite();
> > _canvas.graphics.beginFill(0xffffff, 0);
> > _canvas.graphics.drawRect(0, 0, 865, 465);
> > _canvas.graphics.endFill();
> > _canvas.addChild(_createEmitter());
> >
> > _grey = new BitmapData(865, 465, false, 0xffffff);
> > _spread = new ConvolutionFilter(3, 3, [0, 1, 0, 1, 1,
> > 1, 0, 1, 0], 5);
> > _cooling = new BitmapData(865, 465, false, 0xffffff);
> > _offset = [new Point(), new Point()];
> > _fire = new BitmapData(865, 92, false, 0xffffff);
> > addChild(new Bitmap(_fire));
> >
> > _createCooling(0.16);
> > _createPalette(_currentFireColor = 0);
> >
> > addEventListener(Event.ENTER_FRAME, _update);
> > // stage.addEventListener(MouseEvent.CLICK, _onClick);
> > }
> >
> > private function _onClick(e:MouseEvent):void {
> > if (++_currentFireColor == int(_fireColor.height / 32)) {
> > _currentFireColor = 0;
> > }
> > _createPalette(_currentFireColor);
> > }
> >
> > private function _createEmitter():DisplayObject {
> > var tf:TextField = new TextField();
> > tf.selectable = false;
> > tf.autoSize = TextFieldAutoSize.LEFT;
> > tf.defaultTextFormat = new TextFormat('Verdana', 80,
> > 0xffffff, true);
> > tf.text = '__________________________________________';
> > tf.x = (465 - tf.width) / 2;
> > tf.y = 0;
> > // tf.y = (465 - tf.height) / 2;
> > return tf;
> > }
> >
> > private function _createCooling(a:Number):void {
> > _color = new ColorMatrixFilter([
> > a, 0, 0, 0, 0,
> > 0, a, 0, 0, 0,
> > 0, 0, a, 0, 0,
> > 0, 0, 0, 1, 0
> > ]);
> > }
> >
> > private function _createPalette(idx:int):void {
> > _redArray = [];
> > _greenArray = [];
> > _blueArray = [];
> > _alphaArray = [];
> > for (var i:int = 0; i < 256; i++) {
> > var gp:int = new int();
> > gp = _fireColor.getPixel(i, 0);
> > if (gp < 1050112)
> > {
> > _redArray.push(255);
> > _alphaArray.push(255);
> > _greenArray.push(255);
> > _blueArray.push(255);
> > } else {
> > _redArray.push(gp);
> > _alphaArray.push(0);
> > _greenArray.push(0);
> > _blueArray.push(0);
> > }
> > }
> > }
> >
> > private function _update(e:Event):void {
> > _grey.draw(_canvas);
> > _grey.applyFilter(_grey, _grey.rect, ZERO_POINT, _spread);
> > _cooling.perlinNoise(50, 50, 2, 982374, false, false,
> > 0, true, _offset);
> > _offset[0].x += 2.0;
> > _offset[1].y += 2.0;
> > _cooling.applyFilter(_cooling, _cooling.rect,
> > ZERO_POINT, _color);
> > _grey.draw(_cooling, null, null, BlendMode.SUBTRACT);
> > _grey.scroll(0, -3);
> > _fire.paletteMap(_grey, _grey.rect, ZERO_POINT,
> > _redArray, _greenArray, _blueArray, _alphaArray);
> > }
> > }
> > }
> >
> > _______________________________________________
> > Flashcoders mailing list
> > Flashcoders@chattyfig.figleaf.com
> > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> Karl DeSaulniers
> Design Drumm
> http://designdrumm.com
>
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