Help in images

Question

Hi every one,
I'm tring to make a small game.the problem is that the images doesn't appear like i want ,for example if you draw a star and filled it with yellow color then when you move it on the game it moves the whole image with a white background for the non-yellow areas of the image how can i solve that,
shortly ,how to make the background of a certain image transperent to the main background image.
thanks in advance.

Answer 1

If you're simply drawing the star to the screen with Graphics2D.fill(Shape), then this shouldn't happen. It depends, however, on what exactly you mean by "move". If the shape is drawn on a white background, then you try to move it simply by copying the area surrounding the shape to a new location, then you'll end up copying the white background as well. You'll get better results if you simply use Graphics2D.fill(Shape) again.
If you're loading an Image from a GIF file, the transparency in the image will be the same as the transparency in the GIF file. (This may work for PNG files, too... but not JPG files, because they don't support transparency.)
If you're using a BufferedImage to create the star image, you'll need to specify, when you create the BufferedImage, a mode that supports transparency. Then you'll be able to draw that BufferedImage where it's needed.
(The hard part will be erasing the previous location of the star, if you are moving it. This usually requires redrawing the background.)