Question

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

Answer 1

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);