keeping the background

BlitzMax Forums/BlitzMax Beginners Area/keeping the background

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On a background i have drawn Image1 and Image2. Image1 fires a bullet at Image2 ... how do i keep from losing my background and the images when I move the bullet toward the target? When I use flip and cls in moving the bullet, i lose the background and images and end up with the object moving on a blank screen. Do I have to redraw the background and images everytime the object moves a step toward the target?