I am trying to export transparent PNG files using this class:
com.adobe.images.PNGEncoder;
var pngSource:BitmapData = new BitmapData (stage.stageWidth, stage.stageHeight);
pngSource.draw(stage);
var ba:ByteArray = PNGEncoder.encode(pngSource);
var file:File = File.desktopDirectory.resolvePath("test.png");
var fileStream:FileStream = new FileStream();
fileStream.open(file, FileMode.WRITE);
fileStream.writeBytes(ba);
fileStream.close();
All works fine - except the transparent issue...
If I could get Flash's stage color be transparent then it will work - but unfortunatly - there is no such option.
Are there any options I am missing?
You need to make a BitmapData instance with a transparent background. You do that through the transparent argument in the constructor and a fill color with an alpha component(ARGB in hex):
var pngSource:BitmapData = new BitmapData (stage.stageWidth, stage.stageHeight,true,0x00FFFFFF);//'transparent white'
Related
I have a rectangle MovieClip (named rect) on the stage and i want the user to be able to save that rectangle MovieClip as a ".png" image on his computer, this is what i did:
//Convert my MovieClip to BitmapData
var bitmapData:BitmapData=new BitmapData(rect.width, rect.height);
//Create new ByteArray
var byteArray:ByteArray = new ByteArray();
//Encode my Bitmap to PNG
bitmapData.encode(new Rectangle(0,0,450,170), new flash.display.PNGEncoderOptions(), byteArray);
//saving the byteArray that holds the PNG as "myimage.png"
var fileReference:FileReference=new FileReference();
fileReference.save(byteArray, "myimage.png");
when i run the code, it prompts the windows save dialogue and when i save the image i get a blank ".png" image named "myimage.png" with size 450x170 that i specified. Any idea to solve this problem?
I want to use 3 bitmaps to create 1 resulting bitmap. The first will be the background. The second shall be drawn on top of the first with the help of a mask.
The images are loaded into Bitmap/BitmapData objects.
Example:
(red-green image is the mask, red is the visible part)
back mask source result
So how can I do that? What drawing function do I use in ActionScript-3?
Thanks for any help!
Edit:
(my first working solution, works only with pure red, green or blue)
var back: BitmapData = // load the back image
var mask: BitmapData = // load the mask image
var source:BitmapData = // load the source image (32-bit)
var result:BitmapData = back.clone();
// clone source because it will be modified in next step
var source2: BitmapData = source.clone();
// red of the mask becomes the alpha channel of source2
source2.copyChannel(mask, new Rectangle(0, 0, mask.width, mask.height), new Point(0, 0), BitmapDataChannel.RED, BitmapDataChannel.ALPHA);
// draw source2 to result
result.draw(source2);
(Is there a more efficient way? In this solution I have to clone source in order to keep original source bitmap intact.)
I don't know if it's the best way (performance and logic), but you can try:
var background:BitmapData = new Background();
var bmd1:BitmapData = new Mask();
var bmd2:BitmapData = new SourceImage();
var bmDiff:Bitmap = new Bitmap(mergeMaskAndBackground(bmd2, background, bmd1));
addChild(bmDiff);
function mergeMaskAndBackground(src:BitmapData, background:BitmapData, msk:BitmapData):BitmapData
{
var diffBmpData:BitmapData = BitmapData(src.compare(msk));
diffBmpData.floodFill(0, 0, BitmapDataChannel.RED);
diffBmpData.draw(background, new Matrix(), new ColorTransform(), BlendMode.OVERLAY, background.rect, true);
return diffBmpData;
}
i've testing some code in using createjs + box2dweb, i exported a vector ball in blue color drawn by flash cs 6, here is part of the code.
var birds = (function() {
var spawn = function() {
//circle = new lib.ball1();
//var birdBMP = new createjs.Bitmap("images/bird.png");
var birdBMP = new lib.ball1();
birdBMP.x = Math.round(Math.random()*500);
birdBMP.y = -30;
birdBMP.regX = 60.75; // important to set origin point to center of your bitmap
birdBMP.regY = 60.75;
birdBMP.snapToPixel = true;
birdBMP.mouseEnabled = false;
stage.addChild(birdBMP);
box2d.createBird(birdBMP);
}
return {
spawn: spawn
}
})();
here i want to do change the color of the blue ball, how can i do that?
******updated*******
inclucde js
change code
birdBMP.cache(0, 0, 121.5, 121.5);
colorRan1 = Math.round(Math.random()*255);
colorRan2 = Math.round(Math.random()*255);
colorRan3 = Math.round(Math.random()*255);
birdBMP.filters = [
new createjs.ColorFilter(0,0,0,1, colorRan1,colorRan2,colorRan3,0)
];
birdBMP.updateCache();
I don't know too much about the createjs Flash Extension, but I highly suspect, that from the Flash Export there is also no way to simply "change" a color - you have probably three options:
1) ColorMatrixFilter - this involves caching ect. and I wouldn't recommend this for your purpose.
2) Draw another ball in the desired color and change the Bitmap to that other (differently colored) ball.
3) Or if it is a simple shape you can use the exported lib.ball1() method and extend it with a color-parameter. - In that case you would also have to change the references bitmap/shape, if you want to change the color post-creation.
How do I make transparent background to imported image in flash, because now i imported it and image has white box around it.
code for adding images to stage
var imageBD = (Math.floor(Math.random()*2))? new Trees() : new Rocks;
var bitmap:Bitmap = new Bitmap();
var BD:BitmapData = new BitmapData(imageBD.width, imageBD.height);
BD.draw(imageBD);
bitmap.bitmapData = BD;
bitmap.width = mRadius * 2 * mToPx;
bitmap.height = mRadius * 2 * mToPx;
bitmap.x = pxStartX;
bitmap.y = pxStartY;
this.addChild(bitmap);
obstacleImages.push(bitmap)
Since i'm mew i cannot post images so i'm giving you a link to image:http://prntscr.com/pugdl
You need to specifically tell the BitmapData (docs) object to be transparent.
In your case, replace this line:
var BD:BitmapData = new BitmapData(imageBD.width, imageBD.height);
...with this:
var BD:BitmapData = new BitmapData(imageBD.width, imageBD.height, true, 0x00000000);
Make sure the image itself has transparency. General file types for these kinds of images are PNG or GIF.
You shouldn't have to do anything for Flash to find the transparency.
I've got problem with transparent using PNGEncoder class. When I encode BitmapData to png and use it as source of my Image, it looks terrible. I attach example. There are two images - first colorful and above him white with alpha gradient.
Image before save
Image after save
I've used some other libraries like AsPngEncoder, but it didn't help. It's code I use:
var bd:BitmapData = new BitmapData(container.width, container.height, true, 0xffffff);
bd.draw(container);
var pngenc:PNGEncoder = new PNGEncoder();
var pngByteArray:ByteArray = pngenc.encode(bd);
container.source = pngByteArray;
var fl:File = File.applicationStorageDirectory.resolvePath("./images/file.png");
var fs:FileStream = new FileStream();
fs.open(fl, FileMode.WRITE);
fs.writeBytes(pngByteArray);
fs.close();
Try to use new Flash Player 11.3 feature
http://help.adobe.com/en_US/as3/dev/WS4768145595f94108-17913eb4136eaab51c7-8000.html