[SDL] How Differently?

[Evan Balster]

Hey. Looking at your code you want to make a moving ball, but the old images
pollute the screen.

A simple solution is to clear the screen with
SDL_FillRect(screen,&screen->clip_rect,0x00000000); each loop.

If you want trailing "motion" images of the ball that don't jump back
and forth, make a "virtual screen",
blit the ball sprite to that and blit it to the screen each loop.

And if you mean drawing this without refreshing the screen just delete
the SDL_Delay and SDL_Flip lines.


int kolysanie_statkami()
{
       ball[0]=IMG_Load("czaszka.bmp");
       ball[1]=IMG_Load("czaszka.bmp");


        while(pl==false)
        {
       for(int i=0;i<=50;++i)

        {
            apply_surface(++i, 40, ball[0], screen );
            apply_surface(++i+80, 40, ball[1], screen );
            //Szybkosc kołysania
            SDL_Delay(80);
            SDL_Flip(screen);

        }
         for(int j=50;j>=0;--j)

        {
           apply_surface(--j, 40, ball[0], screen );
           apply_surface(--j+80,40, ball[1], screen );
           //Szybkosc kołysania
            SDL_Delay(80);

           SDL_Flip(screen);
        }

     }
}
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