#include "allegro.h"

int grInit(void);
void wait_for_keypress();

int main(void)
  { 
  int rc;

  int w, h, top, bot, Rwd, Rht, space, space1, space2, space3, space4;


// initialize graphics
  rc = grInit();

// ... and check for initialization error
  if (rc == -1)
    return 1;

  // stuff that shows graphics... here just show a dot at 100, 100
  putpixel(screen, 100, 100, 5);

  // show some text that we can see
  textout(screen, font, "Hello", 10, 20, 50);
  
  // write something in the middle of the screen
  textout_centre (screen, font, "center", 320, 240, 255);
  
  // try some flood filling

w = SCREEN_W;                
h = SCREEN_H;
 
// choose rectangle size
  Rwd = 20;
  Rht = 40;

// y coord of rect tops and
// y coord of rect bottoms
top = h/2 - Rht/2;            
bot = h/2 + Rht/2;            
 
// size of space between rects
space = (w - 3*Rwd)/3;            
 
// draw the three rectangles in green

space1 = (int) (1.5*space + Rwd);
space2 = (int) (1.5*space + 2*Rwd);

space3 = (int) (2.5*space + 2*Rwd);
space4 = (int) (2.5*space + 3*Rwd);

rect(screen, space/2, top, space/2 + Rwd, bot, 50); 
rect(screen, space1, top, space2, bot, 50);
rect(screen, space3, top, space4, bot, 50);
 
 
// calc pt at 1,1 offset from top left of each rect; 
floodfill(screen, space/2 + 1, top + 1, 100);
floodfill(screen, space1 + 1, top + 1, 150);
floodfill(screen, space3 + 1, top + 1, 200);


//return control to user
  wait_for_keypress();

  return 0;
  }

END_OF_MAIN();

//*******************************************************************
// This initializes the graphics system.  Note that it is called from
// main().  You must include this in your program - but you do not 
// have to copy the comments.
//*******************************************************************
int grInit()
{
/* you should always do this at the start of Allegro programs */
allegro_init();

/* set up the keyboard handler */
install_keyboard(); 

/* set a graphics mode sized 640x480 */
if (set_gfx_mode(GFX_SAFE, 640, 480, 0, 0) != 0) 
  {
  set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
  allegro_message("Unable to set any graphic mode\n%s\n", allegro_error);
  return -1;
  }

/* set the color palette */
set_palette(desktop_palette);

/* clear the screen to white */
clear_to_color(screen, makecol(255, 255, 255));

/* you don't need to do this, but on some platforms (eg. Windows) things
* will be drawn more quickly if you always acquire the screen before
* trying to draw onto it.
*/
acquire_screen();

/* set transparent text */
text_mode(-1);
return 1;
}

//*******************************************************************
void wait_for_keypress()
{
/* you must always release bitmaps before calling any input functions */
release_screen(); // seems optional; slows down next operations
readkey(); 
acquire_screen(); // but adding this speeds it up again
}