Source:NetHack 3.6.0/src/rect.c

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 /* NetHack 3.6	rect.c	$NHDT-Date: 1432512774 2015/05/25 00:12:54 $  $NHDT-Branch: master $:$NHDT-Revision: 1.11 $ */
 /* Copyright (c) 1990 by Jean-Christophe Collet	 */
 /* NetHack may be freely redistributed.  See license for details. */
 
 #include "hack.h"
 
 int FDECL(get_rect_ind, (NhRect *));
 
 STATIC_DCL boolean FDECL(intersect, (NhRect *, NhRect *, NhRect *));
 
 /*
  * In this file, we will handle the various rectangle functions we
  * need for room generation.
  */
 
 #define MAXRECT 50
 #define XLIM 4
 #define YLIM 3
 
 static NhRect rect[MAXRECT + 1];
 static int rect_cnt;
 

init_rect

 /*
  * Initialisation of internal structures. Should be called for every
  * new level to be build...
  */
 
 void
 init_rect()
 {
     rect_cnt = 1;
     rect[0].lx = rect[0].ly = 0;
     rect[0].hx = COLNO - 1;
     rect[0].hy = ROWNO - 1;
 }
 

get_rect_ind

 /*
  * Search Index of one precise NhRect.
  *
  */
 
 int
 get_rect_ind(r)
 NhRect *r;
 {
     register NhRect *rectp;
     register int lx, ly, hx, hy;
     register int i;
 
     lx = r->lx;
     ly = r->ly;
     hx = r->hx;
     hy = r->hy;
     for (i = 0, rectp = &rect[0]; i < rect_cnt; i++, rectp++)
         if (lx == rectp->lx && ly == rectp->ly && hx == rectp->hx
             && hy == rectp->hy)
             return i;
     return -1;
 }
 

get_rect

 /*
  * Search a free rectangle that include the one given in arg
  */
 
 NhRect *
 get_rect(r)
 NhRect *r;
 {
     register NhRect *rectp;
     register int lx, ly, hx, hy;
     register int i;
 
     lx = r->lx;
     ly = r->ly;
     hx = r->hx;
     hy = r->hy;
     for (i = 0, rectp = &rect[0]; i < rect_cnt; i++, rectp++)
         if (lx >= rectp->lx && ly >= rectp->ly && hx <= rectp->hx
             && hy <= rectp->hy)
             return rectp;
     return 0;
 }
 

rnd_rect

 /*
  * Get some random NhRect from the list.
  */
 
 NhRect *
 rnd_rect()
 {
     return rect_cnt > 0 ? &rect[rn2(rect_cnt)] : 0;
 }
 

intersect

 /*
  * Search intersection between two rectangles (r1 & r2).
  * return TRUE if intersection exist and put it in r3.
  * otherwise returns FALSE
  */
 
 STATIC_OVL boolean
 intersect(r1, r2, r3)
 NhRect *r1, *r2, *r3;
 {
     if (r2->lx > r1->hx || r2->ly > r1->hy || r2->hx < r1->lx
         || r2->hy < r1->ly)
         return FALSE;
 
     r3->lx = (r2->lx > r1->lx ? r2->lx : r1->lx);
     r3->ly = (r2->ly > r1->ly ? r2->ly : r1->ly);
     r3->hx = (r2->hx > r1->hx ? r1->hx : r2->hx);
     r3->hy = (r2->hy > r1->hy ? r1->hy : r2->hy);
 
     if (r3->lx > r3->hx || r3->ly > r3->hy)
         return FALSE;
     return TRUE;
 }
 

remove_rect

 /*
  * Remove a rectangle from the list of free NhRect.
  */
 
 void
 remove_rect(r)
 NhRect *r;
 {
     int ind;
 
     ind = get_rect_ind(r);
     if (ind >= 0)
         rect[ind] = rect[--rect_cnt];
 }
 

add_rect

 /*
  * Add a NhRect to the list.
  */
 
 void
 add_rect(r)
 NhRect *r;
 {
     if (rect_cnt >= MAXRECT) {
         if (wizard)
             pline("MAXRECT may be too small.");
         return;
     }
     /* Check that this NhRect is not included in another one */
     if (get_rect(r))
         return;
     rect[rect_cnt] = *r;
     rect_cnt++;
 }
 

split_rects

 /*
  * Okay, here we have two rectangles (r1 & r2).
  * r1 was already in the list and r2 is included in r1.
  * What we want is to allocate r2, that is split r1 into smaller rectangles
  * then remove it.
  */
 
 void
 split_rects(r1, r2)
 NhRect *r1, *r2;
 {
     NhRect r, old_r;
     int i;
 
     old_r = *r1;
     remove_rect(r1);
 
     /* Walk down since rect_cnt & rect[] will change... */
     for (i = rect_cnt - 1; i >= 0; i--)
         if (intersect(&rect[i], r2, &r))
             split_rects(&rect[i], &r);
 
     if (r2->ly - old_r.ly - 1
         > (old_r.hy < ROWNO - 1 ? 2 * YLIM : YLIM + 1) + 4) {
         r = old_r;
         r.hy = r2->ly - 2;
         add_rect(&r);
     }
     if (r2->lx - old_r.lx - 1
         > (old_r.hx < COLNO - 1 ? 2 * XLIM : XLIM + 1) + 4) {
         r = old_r;
         r.hx = r2->lx - 2;
         add_rect(&r);
     }
     if (old_r.hy - r2->hy - 1 > (old_r.ly > 0 ? 2 * YLIM : YLIM + 1) + 4) {
         r = old_r;
         r.ly = r2->hy + 2;
         add_rect(&r);
     }
     if (old_r.hx - r2->hx - 1 > (old_r.lx > 0 ? 2 * XLIM : XLIM + 1) + 4) {
         r = old_r;
         r.lx = r2->hx + 2;
         add_rect(&r);
     }
 }
 
 /*rect.c*/