practice/sdl/first/main.c

#include "SDL/SDL.h"

#define TRUE 1
#define FALSE 0

const int WINDOW_WIDTH = 640;
const int WINDOW_HEIGHT = 480;
const char* WINDOW_TITLE = "SDL Start";

void drawSprite(SDL_Surface* imageSurface,
								SDL_Surface* screenSurface,
								int srcX, int srcY,
								int dstX, int dstY,
								int width, int height);

int main(int argc, char **argv)
{
   SDL_Init( SDL_INIT_VIDEO );

   SDL_Surface* screen = SDL_SetVideoMode( WINDOW_WIDTH, WINDOW_HEIGHT, 0,
      SDL_HWSURFACE | SDL_DOUBLEBUF );
   SDL_WM_SetCaption( WINDOW_TITLE, 0 );

	 SDL_Surface* bitmap = SDL_LoadBMP("bat.bmp");
	 SDL_SetColorKey( bitmap, SDL_SRCCOLORKEY, SDL_MapRGB(bitmap->format, 255, 0, 255) );
	 
	 int batImageX = 24;
	 int batImageY = 63;
	 int batWidth = 65;
	 int batHeight = 44;

	 //bat pos
	 int batX = 100;
	 int batY = 100;

   SDL_Event event;
   int gameRunning = TRUE;
	 int keysHeld[323] = {FALSE};

   while (gameRunning == TRUE)
   {
		 // Handle input
		 if (SDL_PollEvent(&event))
     {
			 if (event.type == SDL_QUIT)
       {
				 gameRunning = FALSE;
			 }

       if (event.type == SDL_KEYDOWN) {
				 keysHeld[event.key.keysym.sym] = TRUE;
			 }
			 if (event.type == SDL_KEYUP)
			 {
				 keysHeld[event.key.keysym.sym] = FALSE;
			 }
		 }

		 if ( keysHeld[SDLK_ESCAPE] )
		 {
			 gameRunning = FALSE;
		 }
		 if (keysHeld[SDLK_LEFT] )
		 {
			 batX -= 1;
		 }
		 if (keysHeld[SDLK_RIGHT] )
		 {
			 batX += 1;
		 }
		 if (keysHeld[SDLK_UP])
		 {
			 batY -= 1;
		 }
		 if (keysHeld[SDLK_DOWN])
		 {
			 batY += 1;
		 }

		 // Draw scene
		 SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0));

		 drawSprite(bitmap,
				 				screen,
								batImageX, batImageY,
								batX, batY,
								batWidth, batHeight);
		 SDL_Flip(screen);
   }
		
	 SDL_FreeSurface(bitmap);
   SDL_Quit();

   return 0;
}

void drawSprite(SDL_Surface* imageSurface,
                SDL_Surface* screenSurface,
                int srcX, int srcY,
                int dstX, int dstY,
                int width, int height)
{
   SDL_Rect srcRect;
   srcRect.x = srcX;
   srcRect.y = srcY;
   srcRect.w = width;
   srcRect.h = height;

   SDL_Rect dstRect;
   dstRect.x = dstX;
   dstRect.y = dstY;
   dstRect.w = width;
   dstRect.h = height;

   SDL_BlitSurface(imageSurface, &srcRect, screenSurface, &dstRect);
}