Towe of Hanoi graphical

[oenwings]

I have the code to show tower of hanoi graphically.
It is very hard coded,can anyone help me to remove hard coded sotuation.

#include <gtk/gtk.h>
#include <stdlib.h>

int diskisin [5], posinpeg [5],
  diskcount [3], width = 655,
  height = 430, delay = 100000,
  ysize = 20, kbhit, n;
double cl [] [3] = {{1, 1, 1},
  {.5, .5, .5}, {0, 0, 1},
  {0, 1, 0}, {0, 1, 1},
  {1, 0, 0}, {1, 0, 1}};
GdkPixmap *pixmap;
GtkWidget *da;
cairo_t *cr;

void drawscreen ()
{
  if (kbhit) return;
  gtk_widget_queue_draw_area
  (da, 0, 0, width, height);
  for (g_usleep (delay);
    g_main_context_iteration
    (0, 0); );
}

void rectangle (int x, int y, int width, int height, int cn)
{
  cairo_set_source_rgb (cr,
  cl [cn] [0], cl [cn] [1],
    cl [cn] [2]);
  cairo_rectangle (cr, x, y,
    width, height);
  cairo_fill (cr);
}

void dostep (int *x, int *y, int xd, int yd, int size, int disk)
{
  rectangle (*x, *y, size,
    ysize, 0);
  rectangle (*x += xd,
    *y += yd, size, ysize,
    disk + 1);
  drawscreen ();
}

void movedisk (int disk, int from, int to)
{
  int size = disk * 40, tx, ty,
    x, y;

  x = 5 + diskisin [disk - 1] *
    215 + (5 - disk) * 20;
  y = 150 +
    posinpeg [disk - 1] * 30;
  while (y > 60)
    dostep (&x, &y, 0, -30,
      size, disk);
  tx = 5 + to * 215 +
    (5 - disk) * 20;
  while (x != tx)
    dostep (&x, &y, tx < x ?
      -43 : 43, 0, size, disk);
  posinpeg [disk - 1] = n - 1 -
    diskcount [to]++;
  diskcount [from]--;
  diskisin [disk - 1] = to;
  ty = 150 +
    posinpeg [disk - 1] * 30;
  while (y < ty)
    dostep (&x, &y, 0, 30,
      size, disk);
}

void towers (int n, int from, int to, int aux)
{
  if (n == 1) {
    movedisk (1, from, to);
    return;
  }
  if (kbhit) return;
  towers (n - 1, from, aux,
    to);
  if (kbhit) return;
  movedisk (n, from, to);
  towers (n - 1, aux, to,
    from);
}

gint expose_event ()
{
  gdk_draw_drawable
    (da->window,
    da->style->white_gc,
    pixmap, 0, 0, 0, 0, width,
    height);
  return 0;
}

gint shut ()
{
  kbhit = 1;
  return 0;
}

int main (int argc, char **argv)
{
  int i;
  char buf [FILENAME_MAX];
  GtkWidget *window;
  PangoFontDescription *font;
  PangoLayout *text;

  gtk_init (&argc, &argv);
  window = gtk_window_new
    (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_size_request
    (window, width, height);
  gtk_window_set_resizable
    (GTK_WINDOW (window), 0);
  gtk_window_set_title
    (GTK_WINDOW (window),
    "Towers of Hanoi");
  da = gtk_drawing_area_new ();
  gtk_container_add
    (GTK_CONTAINER (window),
    da);
  gtk_widget_set_events
    (window,
    GDK_KEY_PRESS_MASK);
  g_signal_connect (window,
    "delete_event",
    G_CALLBACK (shut), 0);
  g_signal_connect
    (G_OBJECT (window),
    "key_press_event",
    G_CALLBACK (shut), 0);
  g_signal_connect
    (G_OBJECT (da),
    "expose_event",
    G_CALLBACK (expose_event),
    0);
  /* before pixmap, gc etc */
  gtk_widget_show_all (window);
  text =
gtk_widget_create_pango_layout
    (da, "T o w e r s   o f"
    "    H a n o i");
  font =
pango_font_description_from_string
    ("monospace bold");
pango_font_description_set_absolute_size
    (font, 16 * PANGO_SCALE);
pango_layout_set_font_description
    (text, font);
  pixmap = gdk_pixmap_new
    (window->window, width,
    height, -1);
  cr = gdk_cairo_create
    (pixmap);

  printf ("Enter no. of "
    "disks (1-5): ");
  fgets (buf, FILENAME_MAX,
    stdin);
  n = strtol (buf, 0, 10);
  if (n < 1 || n > 5) return 1;
  for (g_usleep (delay);
    g_main_context_iteration
      (0, 0); );
  cairo_set_antialias (cr,
    CAIRO_ANTIALIAS_DEFAULT);
  rectangle (0, 0, width,
    height, 0);
  rectangle (150, 13,
    490 - 150, 33 - 13, 1);
  rectangle (160, 324,
    480 - 160, 346 - 324, 1);
  cairo_set_source_rgb (cr,
    cl [0] [0], cl [0] [1],
    cl [0] [2]);
  cairo_move_to (cr, 170, 14);
  pango_cairo_show_layout (cr,
    text);
  pango_layout_set_text (text,
    "Press any key to S T O P",
    -1);
  cairo_move_to (cr, 197, 325);
  pango_cairo_show_layout (cr,
    text);
  diskcount [0] = n;
  for (i = 0; i < n; i++)
    posinpeg [i] = i;
  for (i = 0; i < n; i++)
    rectangle (5 +
      diskisin [i] * 215 +
      (4 - i) * 20, 150 +
      i * 30, 40 + i * 40,
      ysize, i + 2);
  drawscreen ();
  towers (n, 0, 2, 1);
  while (!kbhit)
    for (g_usleep (delay);
      g_main_context_iteration (0, 0); );
  pango_font_description_free (font);
  cairo_destroy (cr);
  g_object_unref (pixmap);
  g_object_unref (text);
  return 0;
}