Source:NetHack 3.2.0/rect.c

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1.    /*	SCCS Id: @(#)rect.c	3.2	90/02/22	*/
2.    /* Copyright (c) 1990 by Jean-Christophe Collet	 */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    #include "hack.h"
6.    
7.    int FDECL(get_rect_ind, (NhRect *));
8.    
9.    static boolean FDECL(intersect, (NhRect *,NhRect *,NhRect *));
10.   
11.       /*
12.        * In this file, we will handle the various rectangle functions we
13.        * need for room generation.
14.        */
15.   
16.   #define MAXRECT	50
17.   #define XLIM	4
18.   #define YLIM	3
19.   
20.   static NhRect rect[MAXRECT+1];
21.   static int rect_cnt;
22.   
23.   /*
24.    * Initialisation of internal structures. Should be called for every
25.    * new level to be build...
26.    */
27.   
28.   void
29.   init_rect()
30.   {
31.   	rect_cnt = 1;
32.   	rect[0].lx = rect[0].ly = 0;
33.   	rect[0].hx = COLNO - 1;
34.   	rect[0].hy = ROWNO - 1;
35.   }
36.   
37.   /*
38.    * Search Index of one precise NhRect.
39.    *
40.    */
41.   
42.   int
43.   get_rect_ind(r)
44.   NhRect *r;
45.   {
46.   	register NhRect *rectp;
47.   	register int lx, ly, hx, hy;
48.   	register int i;
49.   
50.   	lx = r->lx; ly = r->ly;
51.   	hx = r->hx; hy = r->hy;
52.   	for (i=0,rectp = &rect[0];i<rect_cnt;i++,rectp++)
53.   	    if ( lx == rectp->lx && ly == rectp->ly &&
54.   		 hx == rectp->hx && hy == rectp->hy)
55.   		return i;
56.   	return -1;
57.   }
58.   
59.   /*
60.    * Search a free rectangle that include the one given in arg
61.    */
62.   
63.   NhRect *
64.   get_rect(r)
65.   NhRect *r;
66.   {
67.   	register NhRect *rectp;
68.   	register int lx, ly, hx, hy;
69.   	register int i;
70.   
71.   	lx = r->lx; ly = r->ly;
72.   	hx = r->hx; hy = r->hy;
73.   	for (i=0,rectp = &rect[0];i<rect_cnt;i++,rectp++)
74.   	    if ( lx >= rectp->lx && ly >= rectp->ly &&
75.   		 hx <= rectp->hx && hy <= rectp->hy)
76.   		return rectp;
77.   	return 0;
78.   }
79.   
80.   /*
81.    * Get some random NhRect from the list.
82.    */
83.   
84.   NhRect *
85.   rnd_rect()
86.   {
87.   	    return rect_cnt > 0 ? &rect[rn2(rect_cnt)] : 0;
88.   }
89.   
90.   /*
91.    * Search intersection between two rectangles (r1 & r2).
92.    * return TRUE if intersection exist and put it in r3.
93.    * otherwise returns FALSE
94.    */
95.   
96.   static boolean
97.   intersect(r1, r2, r3)
98.   NhRect *r1, *r2, *r3;
99.   {
100.  	if (r2->lx > r1->hx || r2->ly > r1->hy ||
101.  	    r2->hx < r1->lx || r2->hy < r1->ly)
102.  	    return FALSE;
103.  
104.  	r3->lx = (r2->lx > r1->lx ? r2->lx : r1->lx);
105.  	r3->ly = (r2->ly > r1->ly ? r2->ly : r1->ly);
106.  	r3->hx = (r2->hx > r1->hx ? r1->hx : r2->hx);
107.  	r3->hy = (r2->hy > r1->hy ? r1->hy : r2->hy);
108.  
109.  	if (r3->lx > r3->hx || r3->ly > r3->hy)
110.  	    return FALSE;
111.  	return TRUE;
112.  }
113.  
114.  /*
115.   * Remove a rectangle from the list of free NhRect.
116.   */
117.  
118.  void
119.  remove_rect(r)
120.  NhRect *r;
121.  {
122.  	int ind;
123.  
124.  	ind = get_rect_ind(r);
125.  	if ( ind >=0 )
126.  	    rect[ind] = rect[--rect_cnt];
127.  }
128.  
129.  /*
130.   * Add a NhRect to the list.
131.   */
132.  
133.  void
134.  add_rect(r)
135.  NhRect *r;
136.  {
137.  	if (rect_cnt >= MAXRECT) {
138.  #ifdef WIZARD
139.  		if (wizard) pline("MAXRECT may be too small.");
140.  #endif
141.  		return;
142.  	}
143.  	/* Check that this NhRect is not included in another one */
144.  	if (get_rect(r))
145.  	    return;
146.  	rect[rect_cnt] = *r;
147.  	rect_cnt++;
148.  }
149.  
150.  /*
151.   * Okay, here we have two rectangles (r1 & r2).
152.   * r1 was already in the list and r2 is included in r1.
153.   * What we want is to allocate r2, that is split r1 into smaller rectangles
154.   * then remove it.
155.   */
156.  
157.  void
158.  split_rects(r1, r2)
159.  NhRect *r1, *r2;
160.  {
161.  	NhRect r, old_r;
162.  	int i;
163.  
164.  	old_r = *r1;
165.  	remove_rect(r1);
166.  
167.  	/* Walk down since rect_cnt & rect[] will change... */
168.  	for (i=rect_cnt-1; i>=0; i--)
169.  	    if (intersect(&rect[i], r2, &r))
170.  		split_rects(&rect[i], &r);
171.  	
172.  	if (r2->ly - old_r.ly-1 > (old_r.hy < ROWNO - 1 ? 2*YLIM : YLIM+1)+4) {
173.  		r = old_r;
174.  		r.hy = r2->ly - 2;
175.  		add_rect(&r);
176.  	}
177.  	if (r2->lx - old_r.lx-1 > (old_r.hx < COLNO - 1 ? 2*XLIM : XLIM+1)+4) {
178.  		r = old_r;
179.  		r.hx = r2->lx - 2;
180.  		add_rect(&r);
181.  	}
182.  	if (old_r.hy - r2->hy-1 > (old_r.ly > 0 ? 2*YLIM : YLIM+1)+4) {
183.  		r = old_r;
184.  		r.ly = r2->hy + 2;
185.  		add_rect(&r);
186.  	}
187.  	if (old_r.hx - r2->hx-1 > (old_r.lx > 0 ? 2*XLIM : XLIM+1)+4) {
188.  		r = old_r;
189.  		r.lx = r2->hx + 2;
190.  		add_rect(&r);
191.  	}
192.  }
193.  
194.  /*rect.c*/