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C-/C++-Quelltext

#include <SDL.h>
#include <SDL_image.h> 
#include <stdio.h>
#include <stdlib.h>
#include <time.h> 

// SDL.h               -> for SDL fuction
// SDL_image.h  -> for bmps,jpgs, format ect .. 
// stdio.h              -> for console, print, 
// stdlib.h             -> for console, print ..
// time.h               -> for timers and seeds the rand()

// color mask for white color makes translucent 
#define MASK 255, 255, 255
 
 // position for all background,ship,enemy objects can use with int + position
  struct position
  {
   int x;
   int y;
  };
  
 
 // Program begin //
  
int main()
{
 
 SDL_Init(SDL_INIT_EVERYTHING);
 // screen 
 SDL_Surface *screen_ ;
 SDL_Surface *image;
 SDL_Surface *ship;
 
 // now we create a multi surface with two ** so we must convert it..
 SDL_Surface **multi_pic; 
  
// position struct to multi.pos
 struct position *multipic_position;
 
  // start  
 SDL_Event event; 
 
 // struct must later covert to rect ..
 SDL_Rect position;
 
 // program loop holds if run = 1
 int run = 0;
 
 // max enemies num can create
 int multipic_num=50;
 
 // i for count multipic_num up,  j for screen buffers
 int i, j;
 
 // ship position
  int ship_position_x = 400;
  int ship_position_y = 430;
 
 // background position 
  int screen_position_x =1;
  int screen_position_y =1;
 
 // seed:random - if you reset your game all rand function goes to NULL
 srand(time(NULL));

    // Initalisire SDL
   if(SDL_Init(SDL_INIT_VIDEO) < 0 )
    {
     return -1;
    }
      
  // convert sdl surface** to sdl_surface*  -> for array  <-> to multi_pic[i]
  // convert struct position to rect for all surfaces... very amazing o.O   !!!
  // i think this is the array conatiner , isnt it ?
 
 multi_pic = (SDL_Surface**)malloc(sizeof (SDL_Surface*)*multipic_num); // SDL_Surface to Array
 multipic_position = (struct position*)malloc(sizeof (struct position)*multipic_num); // rect to int  
 
 
   // load  all pictures  in all format with  SDL_image.h
   image  = IMG_Load("background_a.jpg");
   ship  = IMG_Load("ship.jpg");
   
  // create 20 enemys and 20 x,y rand positions...
     for (i=0; i<multipic_num; i++)
     {
      multi_pic[i]  = SDL_LoadBMP ("astro.bmp"); 
      multipic_position[i].x =  rand()%590+1;
      multipic_position[i].y = 60-rand()%40+1;
     }
     
    // ...only one time !
   
    
   // we draw the screen 800, 600 , 32 bit , buffer 
   screen_ = SDL_SetVideoMode(800,600,32,SDL_HWSURFACE);
   
//+++++++++++++++

// while is open until esc..
 
 while (!run)
 {
    // game logik..
  
  // draw background
      position.x = screen_position_x;
      position.y = screen_position_y;
      SDL_BlitSurface(image,NULL,screen_,&position); 
  
  // draw spaceship
      position.x = ship_position_x;
      position.y = ship_position_y;
      SDL_BlitSurface(ship,NULL,screen_,&position);  
   
    // NOW we draw 20 enemys and make 20 differents x,y position
     for (i=0; i<multipic_num; i++)
     {
      position.x = multipic_position[i].x;
      position.y = multipic_position[i].y;
      SDL_BlitSurface(multi_pic[i],NULL,screen_ ,&position);
      }
   
   // update/reset screen until program ends..
   SDL_Flip(screen_); 
   
   // keyboard function -> esc = quit
   while (SDL_PollEvent(&event))
   { 
    if (event.type == SDL_QUIT ||  event.key.keysym.sym == SDLK_ESCAPE)
     run = 1;
    } 
   
   
     // our enemys comes down with random speed y+ 1to 20
     for (i=0; i<multipic_num; i++)
     {
      multipic_position[i].y +=rand()%20+1; 
     }    
     
 }  // end of main loop
 
 
 // at the end ...clear the memory and quit ;-)
 
 SDL_FreeSurface(image); 
 SDL_FreeSurface(ship);
 SDL_FreeSurface(multi_pic[i]);
 
 SDL_Quit();
 return 0;  
}