Forum: SDL

void Displayboll(SDL_Surface *des, SDL_Surface *img, double x, double y)
{
	SDL_Rect rect;
	rect.x = x;
	rect.y = y;
	rect.w = img->w;
	rect.h = img->h;
 
	SDL_BlitSurface(img, NULL , des, &rect);
}
 
int main(int argc, char *argv[])
{
	atexit(SDL_Quit);
	SDL_Surface *screen;
	SDL_Init(SDL_INIT_VIDEO);
	screen = SDL_SetVideoMode(1200, 900, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);
 
	SDL_Surface *boll;
	boll = SDL_LoadBMP("boll.bmp");
 
        //Bollen placeras i mitten
	double bollX = (screen->w-boll->w)/2, bollY = (screen->h-boll->h)/2;
	Displayboll(screen, boll, (screen->w-boll->w)/2 , (screen->h-boll->h)/2);
	SDL_Flip(screen);
 
 
	SDL_Event eventet;
 
	int limit=1;
	srand (time(NULL));
	while(1)
	{
 
		int x=rand() % 3 - limit;  //Slumpar ett nummer mellan -1 & 1
		int y=rand() % 3 - limit;
 
		bollX += x;
		bollY += y;
 
               //Gör att bollen håller sig inom fönstret (Någon som vet ett effektivare sätt?)
		if (bollX==0)
			bollX=1;
		if (bollX==screen->w-boll->w)
			bollX=screen->w-boll->w-limit;
 
		if (bollY==0)
			bollY=1;
		if (bollY==screen->h-boll->h)
			bollY=screen->h-boll->h-limit;
 
 
		Displayboll(screen, boll, bollX, bollY);
		SDL_Flip(screen);
 
 
 
		SDL_PollEvent(&eventet);
 
		switch(eventet.type)
		{
			case SDL_QUIT:
				cout << "Programmet stangs av..." << endl;
				SDL_Quit();
				return 0;
 
			case SDL_KEYDOWN:
				Uint8 *keys;
 
				keys = SDL_GetKeyState(NULL);
				if(keys[SDLK_ESCAPE])
					SDL_Quit();
		}
 
	}
 
	return 0;
}