Message-Id:	<199801130831.QAA11712@ultra140>
Date:	Mon, 13 Jan 1997 16:29:15 +0800
From:	Wang Jingtao <jtwang AT ultra140 DOT xjtu DOT edu DOT cn>
Reply-To:	jtwang AT ultra140 DOT xjtu DOT edu DOT cn
To:	"jdkris AT NOPOOPalpha DOT delta DOT edu" <jdkris AT NOPOOPalpha DOT delta DOT edu>
Cc:	"djgpp AT delorie DOT com" <djgpp AT delorie DOT com>
Subject:	Re: Sprite help...
Organization:	Artificial Intelligence & Robortics Institute of XJTU
Mime-Version:	1.0

>Howdy....

>Could someone out there help me out and convert this code so that it uses
>Allegro and load a 10x10 bitmap from a file.  Right now it defines all of
>its own functions and doesn't load the bitmap from a file. Thanks alot.

   Don't be too lazy :-) , Allegro is very easy to learn. please check all the
examples in allegro\examples directory. After rewritten your program much smaller.

   The best teacher you can get is yourself.

>#define GRAPHICS        0x013
>#define TEXT            0x03
>char *video_buffer = (char *)0xa0000;

   Here it is :

   Use "gcc -s -o foo.exe foo.c -lalleg" to compile.

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

typedef struct sprite_type {
   unsigned x, y;                  /* location */
   unsigned x_vel, y_vel;          /* velocity */
   char width, height;             /* dimensions */
   char num_frames;                /* number of frames */
   char cur_frame;                 /* current frame */
   BITMAP *background, **frame;
} SPRITE;

void draw_my_sprite(SPRITE * s)
{
    s->x += s->x_vel;
    s->y += s->y_vel;

    blit(screen,s->background,s->x,s->y,0,0,s->width,s->height);
    blit(s->frame[s->cur_frame],screen,0,0,s->x,s->y,s->width,s->height);
}

void erase_my_sprite(SPRITE * s)
{
    blit(s->background,screen,0,0,s->x,s->y,s->width,s->height);
}

void create_cross_sprite(char * filename)
{
  BITMAP *cross;
  RGB pal[256];

  cross = create_bitmap(10,10);
  get_palette(pal);
  clear(cross);
  line(cross,0,0,9,9,15);
  line(cross,9,0,0,9,15);
  rect(cross,0,0,9,9,15);
  save_bitmap(filename,cross,pal);
  destroy_bitmap(cross);
}

int main(void)
{
  unsigned count,i;
  RGB pal[256];
  SPRITE sprite;
  char *filename="sprite.bmp";

  allegro_init();
  install_keyboard();

  create_cross_sprite(filename);

  set_gfx_mode(GFX_VGA, 320, 200, 0, 0);
  set_pallete(pal);

  sprite.x = 160;
  sprite.y = 100;
  sprite.x_vel = 1;
  sprite.y_vel = 1;
  sprite.width = 10;
  sprite.height = 10;
  sprite.num_frames = 1;
  sprite.cur_frame = 0;
  sprite.background = create_bitmap(sprite.width,sprite.height);
  sprite.frame = (BITMAP **)malloc(sizeof(BITMAP *) * sprite.num_frames);
  sprite.frame[0] = load_bitmap(filename,pal);

  set_palette(pal);

  for (count = 0; count < 32000; count++)
  {
     putpixel(screen,rand() % 320, rand() % 200, rand() % 256);
  }

  while(! keypressed())
  {
    if ( (sprite.x > 309) || (sprite.x < 1))
         sprite.x_vel = -sprite.x_vel;

    if((sprite.y > 189) || (sprite.y < 1))
        sprite.y_vel = -sprite.y_vel;

     draw_my_sprite(&sprite);
     delay(10);
     erase_my_sprite(&sprite);
   }
   for (i= 0; i< sprite.num_frames; i++)
       destroy_bitmap(sprite.frame[i]);
   destroy_bitmap(sprite.background);
   free((void *)sprite.frame);
   exit(0);
}


Regards

  Wang Jingtao
  Xi'an Jiaotong University
  P.R. China

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