[Tom_Leonardsson]

Hi there could anyone help me with this

#include "sdl/sdl.h"


const int WINDOW_WIDTH = 640;
const int WINDOW_HEIGHT = 480;
const char* WINDOW_TITLE = "Le Shoot Em Up";

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("sprite.bmp");
    SDL_SetColorKey(bitmap, SDL_SRCCOLORKEY, SDL_MapRGB(bitmap->format, 200, 0, 200));

   int spriteImageX = 24;
   int spriteImageY = 63;
   int spriteWidth = 100;
   int spriteHeight = 100;


   int spriteX = 50;
   int spriteY = 50;

   SDL_Event event;
   bool gameRunning = true;

   bool keysHeld[323] = {false}; // everything will be initialized to false

   while (gameRunning)
   {
      // 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] )
      {
         spriteX -= 1;
      }
      if ( keysHeld[SDLK_RIGHT] )
      {
         spriteX += 1;
      }
      if ( keysHeld[SDLK_UP] )
      {
         spriteY -= 1;
      }
      if (keysHeld[SDLK_DOWN])
      {
         spriteY += 1;
      }

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

      drawSprite(bitmap,
                 screen,
                 spriteImageX, spriteImageY,
                 spriteX, spriteY,
                 spriteWidth, spriteHeight);

      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);
}

thanks

This post has been edited by Tom_Leonardsson: 25 April 2012 - 04:11 AM

[#define]

It seems ok. Have you put the sprite.bmp file in the same folder as the executable program?

[Tom_Leonardsson]

Hi, I have a problem there is suppose to be a enemy on the screen but he wont show, I belive it's something wrong with the code. Iam quite new to this so dont flame.
Thanks!

#include "sdl/sdl.h"
const int WINDOW_WIDTH = 600;
const int WINDOW_HEIGHT = 480;
const char* WINDOW_TITLE = " Drago  ns In Space ";
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* hello = NULL;
   SDL_Surface* enemy = NULL;
   SDL_Surface* screen = SDL_SetVideoMode( WINDOW_WIDTH, WINDOW_HEIGHT, 0,
      SDL_HWSURFACE | SDL_DOUBLEBUF /*| SDL_FULLSCREEN*/);
   SDL_WM_SetCaption( WINDOW_TITLE, 0 );
   // Images
   SDL_Surface* bitmap = SDL_LoadBMP( "sprite.bmp" );
   hello = SDL_LoadBMP( "hello.bmp" );
   enemy = SDL_LoadBMP( "enemy.bmp" );
   // Decides what color shall be removed
   SDL_SetColorKey(bitmap, SDL_SRCCOLORKEY, SDL_MapRGB(bitmap->format, 255, 0, 255));
   //---ints---//
   int spriteImageX = 24;
   int spriteImageY = 63;
   int spriteWidth = 65;
   int spriteHeight = 44;
   int spriteX = 100;
   int spriteY = 100;
   int enemyImageX = 312;
   int enemyImageY = 231;
   int enemyWidth = 65;
   int enemyHeight = 44;
   int enemyX = 100;
   int enemyY = 100;
   SDL_Event event;
   bool gameRunning = true;
   bool keysHeld[323] = {false};
   while (gameRunning)
   {

      if (SDL_PollEvent(&event))
      {
         if (event.type == SDL_QUIT)
         {
            gameRunning = false;
         }
        // keyinput
         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_a] )
      {
         spriteX -= 1;
      }
      if ( keysHeld[SDLK_d] )
      {
         spriteX += 1;
      }
      if ( keysHeld[SDLK_w] )
      {
         spriteY -= 1;
      }
      if (keysHeld[SDLK_s])
      {
         spriteY += 1;
      }
      if (keysHeld[SDLK_k])
      {
         spriteX += 5;
      }
      if (keysHeld[SDLK_j])
      {
            spriteX -= 5;


      }
       if (keysHeld[SDLK_t])
      {
            spriteX = 100;
            spriteY = 100;
            // this is what you use to animate of sort
            //spriteImageX = 132;
            //spriteImageY = 92;
      }
      SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0));
      drawSprite(bitmap,
                 screen,
                 spriteImageX, spriteImageY,
                 spriteX, spriteY,
                 spriteWidth, spriteHeight);
     SDL_Flip(screen);

      SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0));
      drawSprite(bitmap,
                 screen,
                 enemyImageX, enemyImageY,
                 enemyX, enemyY,
                 enemyWidth, enemyHeight);
     //SDL_Flip(screen);


   }
   SDL_FreeSurface( hello );
   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);
}

[JackOfAllTrades]

Merged duplicate topics. Do NOT create a new topic on the same subject as one you already have!

[r.stiltskin]

Does your program build with 0 errors?

Do you have the image file (sprite.bmp) in your project directory?

[ButchDean]

you are not checking return values in your code. It would really help if you review documentation and amend your code accordingly.

[reaper4334]

As ButchDean said, you should be checking return values. It will help narrow down the problem very much.

Also, as a few other people mentioned, ensure that you image is in the correct directory.
If you're using Visual Studio, it must be in the project directory (usually the same place as your .cpp files). If you're not using Visual Studio, it should probably be in the same directory as the .exe file.