How do I remove afterimage in my program without the background being removed?

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I program a moving car and a bike in a road with mountains but the moving car is having afterimages, when I put a cleardevice() function the afterimages will be removed alongside with its background.

What I have tried:

I tried searching for solution but I cant find any.

Posted 2-May-23 6:42am

Ae Jae

Updated 2-May-23 8:56am

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Richard MacCutchan 2-May-23 12:51pm

Every time the car moves, you must first repaint the background before painting the car at its new position.

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Dave Kreskowiak · Answer 1 · 2023-05-02T07:51:00

If you're talking about rendering an animation, you have to redraw everything EVERY FRAME of the animation, with objects in their new locations, like your car. You cannot just "remove the car" and expect it to reveal the background. Once you draw the car, there is no backgroun under it. "Removing" the car will just leave a car shaped black hole where the car used to be.

OriginalGriff · Answer 2 · 2023-05-02T08:56:00

To add to what Dave has - rightly - said, the way I'd do it is to have a background image which I copy each frame, then draw the car onto the copy at each it's current position. Then swap the current image for the new copy and it'll appear to move without any ghosting.

This means keeping three screen images: the one being displayed, the background, and the "spare" - you do not want to start allocating new images, particularly if they are the size of the screen - that will seriously impact performance pretty quickly!

How do I remove afterimage in my program without the background being removed?

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