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# How to stop leaving a tail??

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Hi, I have a little problem. When i blit an image to the main surface and then move it it leaves a tail. I know why, so i tried to redraw everything again each time i make a movement to certain image. I think that will slow very much my application. Is there anyway to move an image without leaving a tail.

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I think that will slow very much my application.

You thought incorrectly.

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quote:
Original post by Dospro
Hi,
I have a little problem. When i blit an image to the main surface and then move it it leaves a tail. I know why, so i tried to redraw everything again each time i make a movement to certain image. I think that will slow very much my application. Is there anyway to move an image without leaving a tail.

fill the screen with an image or rectangle, with code something like this
    SDL_Rect rect;    rect.x=rect.y=0;    rect.h=SCREENHEIGHT;    rect.w=SCREENWIDTH;    SDL_FillRect(screen,&rect,SDL_MapRGB(screen->format,0,0,50));    //add drawing here

should get rid of the tail right away

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Either do what eedok suggests, or cut out (and save) the background before you blit your image, and then blit the saved background just before you blit your image the next time.

ie
1. Blit saved background
2. Cut out (save) background where image is about to be blitted
3. blit image

See cone3D''s sprite tutorial for further help.

I too find that blitting a few images (at a guess 30+), the framerate begins to suffer, and the larger the image, the worse it gets. I managed to get around this by only blitting the images that change position (either through motion or animation).

However, the speed of the PC, the screen resolution, number of colours displayed and the version of DirectX seemed to play a role in the framerate too.

HTH

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Well, now that im not using too many graphics i copy the entire background before coping the moved object. But i asked because i was going to work with a lot of images.

Now the idea of cut the rectangle that will be used is a good idea but maybe it can still be alittle be slow.

Anyway its ok, but if you could find something better it would be much better for me.

Thanks

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