/*
  Name: MySDL Game
  Copyright: OpenSource Of Course Of Course
  Author: Paul the Panopticon
  Date: 21/09/04 21:06
  Description: This app is simply an example to explore the   functionality of the
               SDL Librarly
*/
#include "SDL/SDL.h"   
#include <stdio.h>

//Prototype
int SDL_BlitSurface(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);

//Create SDL Surfaces
SDL_Surface *back;
SDL_Surface *image;
SDL_Surface *screen;

//Movement Values
int xrate=0,yrate=0;//speed of sprite
int xpos =0,ypos =0;//position of sprite

//Accepts a pointer to surface, and coordinates
//It will accept a pointer to the sprite, were its supposed
//to go, and then blit it on the screen surface.
void DrawIMG(SDL_Surface *img, int x, int y){
  SDL_Rect dest;
  dest.x = x;
  dest.y = y;
  SDL_BlitSurface(img, NULL, screen, &dest);
}


int main(int argc,char* argv[]){
    Uint8* keys;
    
    //SDL must be initilaized before anything else
    if( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) < 0 ){
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return(1);
    }
    //This will set the video mode for the screen surface
    screen = SDL_SetVideoMode(800, 600,32,SDL_SWSURFACE|SDL_ANYFORMAT|SDL_FULLSCREEN);
    if ( screen == NULL ){
        fprintf(stderr, "Couldn't set 800x600x32 video mode: %s\n", SDL_GetError());
        return(1);
    }
    
    //Load the images
    back = SDL_LoadBMP("bg.bmp");
    image= SDL_LoadBMP("image.bmp");
    //Draw the background once..not really needed i guess.
    DrawIMG(back, 0, 0);

    //Start the game loop
    int done=0;
    while(done == 0){
        
        SDL_Event event;
        //Get user inputs and process them
        while (SDL_PollEvent(&event)){
            switch (event.type){
                case SDL_QUIT:
                    done = 1 ;
                    break;
                case SDL_KEYDOWN:
                     //evaluates wich key is down and
                     //sets sprite's speed accordingly
                     switch (event.key.keysym.sym){
                        case SDLK_ESCAPE:
                            done = 10;
                            break;
                        case SDLK_UP:
                            yrate = -10;
                            break;
                        case SDLK_DOWN:
                            yrate = 10; 
                            break;
                        case SDLK_LEFT:
                            xrate = -10;
                            break;
                        case SDLK_RIGHT:
                            xrate = 10;
                            break; 
                    }//end switch
                    break;
                case SDL_KEYUP:
                    switch (event.key.keysym.sym){
                        case SDLK_UP:
                            if(yrate < 0){yrate=0;}
                           break;
                        case SDLK_DOWN:
                            if(yrate > 0){yrate = 0; }
                            break;
                        case SDLK_LEFT:
                            if(xrate < 0){xrate =0;}
                            break;
                        case SDLK_RIGHT:
                            if (xrate > 0){xrate = 0;}
                            break; 
                    }//end switch
                    break;
            }//end switch
         }//End While
         //Update sprite position
         xpos=xpos+xrate;
         ypos=ypos+yrate;
         //draw the scene
         DrawIMG(back, 0, 0);
         DrawIMG(image, xpos, ypos);
         SDL_Flip(screen);
    }
    SDL_Quit();
    return(0);
}