Question about SDL?

Take a look at SDL_FillRect(...) or A. Schiffler''s SDL_gfxPrimitives library for boxColor(...) and boxRGBA(...)

What exactly SDL_UpdateRect does?Thanks

I think SDL_UpdateRect(..) works simular to SDL_Flip except only a portion of the screen is copied from the back buffer.

if you are printing a background image to teh screen... dont use fillrect because it is slow. only use fillrect if there is no background image.

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Original post by _SKOTTIE_
if you are printing a background image to teh screen... dont use fillrect because it is slow. only use fillrect if there is no background image.

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True. Also if you know your going to completely fill the screen every time there is no need to clear the buffer.

Thanks guys for the answers.However , I have another last question.I have just started dealing with SDL.Is it possible to make an Arkanoid game with SDL since I''ll have to use float numbers for the position of the ball,the speed and other things and I can see that e.g SDL_BlitSurface() uses only short integers?
Thanks

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Original post by mits
Thanks guys for the answers.However , I have another last question.I have just started dealing with SDL.Is it possible to make an Arkanoid game with SDL since I''ll have to use float numbers for the position of the ball,the speed and other things and I can see that e.g SDL_BlitSurface() uses only short integers?
Thanks

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The first game I wrote while evaluating SDL was an Arkanoid clone (I think... That''s just a Breakout clone, right?)

In order to use use floating point for positioning, just convert to int''s before you draw. It isn''t that expensive. I usually use floats to represent positions and velocities so I know you''ll be fine.

Ok but if I convert floats to ints , won''t I have loss of data?
Thanks

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Original post by mits
Ok but if I convert floats to ints , won''t I have loss of data?
Thanks

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well, (statistically speaking) the position you''re displaying will be about a half pixel off. i don''t think that''s too much of a problem for a breakout type of game...

since you''d only convert your values to integer for the display function, and keep the floats for further calculations, the error won''t be accumulating over time.