/media/sda-magnetic/david/Dok-15-2023-11-27/fernuni-hagen/cs-i-ii/old-cs-2-02/20220411sdl/test2.c

 #include <stdlib.h>
 #include <SDL/SDL.h>
 int main(int argc, char *argv[])
 {
     SDL_Surface *screen, *image;
     SDL_Rect dst, dstblue;
     SDL_Event event;
     Uint8 *keys;
     int tuxX = 50, tuxY = 50;
     int done = 0;
     if (SDL_Init(SDL_INIT_VIDEO) == -1) {
         printf("Can't init SDL:  %s\n", SDL_GetError());
         exit(1);
     }
     atexit(SDL_Quit); 
     screen = SDL_SetVideoMode(640, 480, 16, SDL_HWSURFACE | SDL_DOUBLEBUF);
     SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 255));
     if (screen == NULL) {
         printf("Can't set video mode: %s\n", SDL_GetError());
         exit(1);
     }
     image = SDL_LoadBMP("tux.bmp");
     if (image == NULL) {
         printf("Can't load image of tux: %s\n", SDL_GetError());
         exit(1);
     }	
     dst.w = image->w;
     dst.h = image->h;
     dstblue.w = image->w + 1;
     dstblue.h = image->h + 1;
     SDL_SetColorKey(image, SDL_SRCCOLORKEY, SDL_MapRGB(image->format, 255, 0, 0));    
     while (!done) {
         while (SDL_PollEvent(&event)) {
             switch(event.type) {
             case SDL_QUIT:
                 done = 1;
                 break;
             }
         }
        dstblue.x = tuxX;
        dstblue.y = tuxY;
        keys = SDL_GetKeyState(NULL);
        if (keys[SDLK_UP]) {
            if (tuxY > 10) {
                tuxY--;
            }
        }
        if (keys[SDLK_DOWN]) {
            if (tuxY < 470 - image->h) {
                tuxY++;
            }
        }
        if (keys[SDLK_RIGHT]) {
            if(tuxX < 630 - image->w) {
                tuxX++;
            }
        }
        if (keys[SDLK_LEFT]) {
            if (tuxX > 10) {
                tuxX--;
            }
        }
        dst.x = tuxX;
        dst.y = tuxY;
        SDL_FillRect(screen, &dstblue, SDL_MapRGB(screen->format, 0, 0, 255));
        SDL_BlitSurface(image, NULL, screen, &dst);
        SDL_Flip(screen);
     }
     SDL_FreeSurface(image);
     return 0;
 }