create a flex actioscript project:
when I set bitmap.alpha=0. on the screen, there is a gray rectangle out there.
but this is not supported to be there.
but, when I set alpha=1, it is gone!!!
I don't understand this. in fact if I set alpha to any value between 0 and 1. it will show the gray rectangle. and for any value between 0 and 1, it looks exactly the same.
the document says that when I create the bitmpaData and set the 3rd parameter to true, it means this bitmap support per-pix transparency. but, it should be totally transparent no matter what the value of the alpha value is.
anyone can help? thanks.
package {
import flash.display.*;
public class Test extends Sprite {
public function Test()
{
stage.scaleMode = flash.display.StageScaleMode.NO_SCALE
stage.align = flash.display.StageAlign.TOP_LEFT;
var bitmapData:BitmapData=new BitmapData(200, 200, true, 0x000000)
var bitmap:Bitmap = new Bitmap(bitmapData);
addChild(bitmap);
bitmap.alpha = 0;
}
}
}
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