#include <stdlib.h>
#include <allegro.h>

typedef struct SPRITE
{
    int x, y;
    int w, h;
    int xspeed, yspeed;
    int xdelay, ydelay;
    int xcount, ycount;
    
}SPRITE;

void erase_sprite(BITMAP *dest, SPRITE *spr);
void update_sprite(SPRITE *spr);
     
int main(void)
{
    
    //INIT
    allegro_init();
    install_keyboard();
    install_timer();
    srand(time(NULL));
    
    
    //VIDEO
    set_color_depth(16);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
    
    //SETUP
    SPRITE *DOUBLEKILL;
    BITMAP *double_kill;
    char *dk = "double_kill.bmp";
    double_kill = load_bmp(dk, NULL);
    
    DOUBLEKILL->x = 0;
    DOUBLEKILL->y = 120;
    DOUBLEKILL->w = 60;
    DOUBLEKILL->h = 60;
    DOUBLEKILL->xspeed = 10;
    DOUBLEKILL->yspeed = 0;
    DOUBLEKILL->xdelay = 2;
    DOUBLEKILL->ydelay = 0;
    DOUBLEKILL->xcount = 0;
    DOUBLEKILL->ycount = 0;
    
    draw_sprite(screen, double_kill, DOUBLEKILL->x, DOUBLEKILL->y);
    
    while(DOUBLEKILL->x < 210){
        
        //ERASE SPRITE
        erase_sprite(screen, DOUBLEKILL);
        
        //UPDATE SPRITE
        update_sprite(DOUBLEKILL);
        
        //GET SCREEN
        acquire_screen();
        
        //DRAW SPRITE
        draw_sprite(screen, double_kill, DOUBLEKILL->x, DOUBLEKILL->y);
        
        //RETURN SCREEN
        release_screen();
        rest(50);
        }
        
    while(!key[KEY_ESC]){}
    
    allegro_exit();
    return 0;
}
END_OF_MAIN()

void erase_sprite(BITMAP *dest, SPRITE *spr)
{
     rectfill(dest, spr->x, spr->y, spr->x + spr->w, spr->y + spr->h, 0);
     
}

void update_sprite(SPRITE *spr)
{
     //UPDATE X
     if(++spr->xcount > spr->xdelay){
         spr->xcount = 0;
         spr->x += spr->xspeed;
         }
         
     //UPDATE Y
     if(++spr->ycount > spr->ydelay){
         spr->ycount = 0;
         spr->y += spr->yspeed;
         }
         
}