server/random_maps/expand2x.C

/*
 * Expands a layout by 2x in each dimension.
 * H. S. Teoh
 * --------------------------------------------------------------------------
 * $Id: expand2x.C,v 1.3 2006-09-10 16:06:37 root Exp $
 *
 * ALGORITHM
 *
 * ... (TBW)
 */

#include <stdlib.h>             /* just in case */
#include <expand2x.h>           /* use compiler to do sanity check */


/* PROTOTYPES */

static void expand_misc (char **newlayout, int i, int j, char **layout, int xsize, int ysize);
static void expand_wall (char **newlayout, int i, int j, char **layout, int xsize, int ysize);
static void expand_door (char **newlayout, int i, int j, char **layout, int xsize, int ysize);


/* FUNCTIONS */

char **
expand2x (char **layout, int xsize, int ysize)
{
  int i, j;
  int nxsize = xsize * 2 - 1;
  int nysize = ysize * 2 - 1;

  /* Allocate new layout */
  char **newlayout = (char **) calloc (sizeof (char *), nxsize);

  for (i = 0; i < nxsize; i++)
    {
      newlayout[i] = (char *) calloc (sizeof (char), nysize);
    }

  for (i = 0; i < xsize; i++)
    {
      for (j = 0; j < ysize; j++)
        {
          switch (layout[i][j])
            {
                case '#':
                  expand_wall (newlayout, i, j, layout, xsize, ysize);
                  break;
                case 'D':
                  expand_door (newlayout, i, j, layout, xsize, ysize);
                  break;
                default:
                  expand_misc (newlayout, i, j, layout, xsize, ysize);
            }
        }
    }

  /* Dump old layout */
  for (i = 0; i < xsize; i++)
    {
      free (layout[i]);
    }
  free (layout);

  return newlayout;
}

/* Copy the old tile X into the new one at location (i*2, j*2) and
 * fill up the rest of the 2x2 result with \0:
 *      X  ---> X  \0
 *              \0 \0
 */
static void
expand_misc (char **newlayout, int i, int j, char **layout, int xsize, int ysize)
{
  newlayout[i * 2][j * 2] = layout[i][j];
  /* (Note: no need to reset rest of 2x2 area to \0 because calloc does that
   * for us.) */
}

/* Returns a bitmap that represents which squares on the right and bottom
 * edges of a square (i,j) match the given character:
 *      1       match on (i+1, j)
 *      2       match on (i, j+1)
 *      4       match on (i+1, j+1)
 * and the possible combinations thereof.
 */
static int
calc_pattern (char ch, char **layout, int i, int j, int xsize, int ysize)
{
  int pattern = 0;

  if (i + 1 < xsize && layout[i + 1][j] == ch)
    pattern |= 1;

  if (j + 1 < ysize)
    {
      if (layout[i][j + 1] == ch)
        pattern |= 2;
      if (i + 1 < xsize && layout[i + 1][j + 1] == ch)
        pattern |= 4;
    }

  return pattern;
}

/* Expand a wall. This function will try to sensibly connect the resulting
 * wall to adjacent wall squares, so that the result won't have disconnected
 * walls.
 */
static void
expand_wall (char **newlayout, int i, int j, char **layout, int xsize, int ysize)
{
  int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize);
  int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize);
  int both_pattern = wall_pattern | door_pattern;

  newlayout[i * 2][j * 2] = '#';
  if (i + 1 < xsize)
    {
      if (both_pattern & 1)
        {                       /* join walls/doors to the right */

/*      newlayout[i*2+1][j*2] = '#'; */
          newlayout[i * 2 + 1][j * 2] = layout[i + 1][j];
        }
    }

  if (j + 1 < ysize)
    {
      if (both_pattern & 2)
        {                       /* join walls/doors to the bottom */

/*      newlayout[i*2][j*2+1] = '#'; */
          newlayout[i * 2][j * 2 + 1] = layout[i][j + 1];
        }

      if (wall_pattern == 7)
        {                       /* if orig layout is a 2x2 wall block,
                                 * we fill the result with walls. */
          newlayout[i * 2 + 1][j * 2 + 1] = '#';
        }
    }
}

/* This function will try to sensibly connect doors so that they meet up with
 * adjacent walls. Note that it will also presumptuously delete (ignore) doors
 * that it doesn't know how to correctly expand.
 */
static void
expand_door (char **newlayout, int i, int j, char **layout, int xsize, int ysize)
{
  int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize);
  int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize);
  int join_pattern;

  /* Doors "like" to connect to walls more than other doors. If there is
   * a wall and another door, this door will connect to the wall and
   * disconnect from the other door. */
  if (wall_pattern & 3)
    {
      join_pattern = wall_pattern;
    }
  else
    {
      join_pattern = door_pattern;
    }

  newlayout[i * 2][j * 2] = 'D';
  if (i + 1 < xsize)
    {
      if (join_pattern & 1)
        {                       /* there is a door/wall to the right */
          newlayout[i * 2 + 1][j * 2] = 'D';
        }
    }

  if (j + 1 < ysize)
    {
      if (join_pattern & 2)
        {                       /* there is a door/wall below */
          newlayout[i * 2][j * 2 + 1] = 'D';
        }
    }
}
Revision:	1.4
Committed:	Thu Sep 14 22:34:02 2006 UTC (17 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -2 lines
Log Message:	indent
#	User	Rev	Content
1	elmex	1.1	/*
2			* Expands a layout by 2x in each dimension.
3			* H. S. Teoh
4			* --------------------------------------------------------------------------
5	root	1.4	* $Id: expand2x.C,v 1.3 2006-09-10 16:06:37 root Exp $
6	elmex	1.1	*
7			* ALGORITHM
8			*
9			* ... (TBW)
10			*/
11
12	root	1.3	#include <stdlib.h> /* just in case */
13			#include <expand2x.h> /* use compiler to do sanity check */
14	elmex	1.1
15
16			/* PROTOTYPES */
17
18	root	1.3	static void expand_misc (char newlayout, int i, int j, char layout, int xsize, int ysize);
19			static void expand_wall (char newlayout, int i, int j, char layout, int xsize, int ysize);
20			static void expand_door (char newlayout, int i, int j, char layout, int xsize, int ysize);
21	elmex	1.1
22
23			/* FUNCTIONS */
24
25	root	1.3	char **
26			expand2x (char **layout, int xsize, int ysize)
27			{
28			int i, j;
29			int nxsize = xsize * 2 - 1;
30			int nysize = ysize * 2 - 1;
31	elmex	1.1
32			/* Allocate new layout */
33	root	1.3	char newlayout = (char ) calloc (sizeof (char *), nxsize);
34
35			for (i = 0; i < nxsize; i++)
36			{
37			newlayout[i] = (char *) calloc (sizeof (char), nysize);
38			}
39
40			for (i = 0; i < xsize; i++)
41			{
42			for (j = 0; j < ysize; j++)
43			{
44			switch (layout[i][j])
45			{
46			case '#':
47			expand_wall (newlayout, i, j, layout, xsize, ysize);
48			break;
49			case 'D':
50			expand_door (newlayout, i, j, layout, xsize, ysize);
51			break;
52			default:
53			expand_misc (newlayout, i, j, layout, xsize, ysize);
54			}
55			}
56	elmex	1.1	}
57
58			/* Dump old layout */
59	root	1.3	for (i = 0; i < xsize; i++)
60			{
61			free (layout[i]);
62			}
63			free (layout);
64	elmex	1.1
65			return newlayout;
66			}
67
68			/* Copy the old tile X into the new one at location (i2, j2) and
69			* fill up the rest of the 2x2 result with \0:
70			* X ---> X \0
71			* \0 \0
72			*/
73	root	1.3	static void
74			expand_misc (char newlayout, int i, int j, char layout, int xsize, int ysize)
75			{
76			newlayout[i * 2][j * 2] = layout[i][j];
77	elmex	1.1	/* (Note: no need to reset rest of 2x2 area to \0 because calloc does that
78			* for us.) */
79			}
80
81			/* Returns a bitmap that represents which squares on the right and bottom
82			* edges of a square (i,j) match the given character:
83			* 1 match on (i+1, j)
84			* 2 match on (i, j+1)
85			* 4 match on (i+1, j+1)
86			* and the possible combinations thereof.
87			*/
88	root	1.3	static int
89			calc_pattern (char ch, char **layout, int i, int j, int xsize, int ysize)
90			{
91	elmex	1.1	int pattern = 0;
92
93	root	1.3	if (i + 1 < xsize && layout[i + 1][j] == ch)
94	elmex	1.1	pattern \|= 1;
95
96	root	1.3	if (j + 1 < ysize)
97			{
98			if (layout[i][j + 1] == ch)
99			pattern \|= 2;
100			if (i + 1 < xsize && layout[i + 1][j + 1] == ch)
101			pattern \|= 4;
102			}
103	elmex	1.1
104			return pattern;
105			}
106
107			/* Expand a wall. This function will try to sensibly connect the resulting
108			* wall to adjacent wall squares, so that the result won't have disconnected
109			* walls.
110			*/
111	root	1.3	static void
112			expand_wall (char newlayout, int i, int j, char layout, int xsize, int ysize)
113			{
114			int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize);
115			int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize);
116	elmex	1.1	int both_pattern = wall_pattern \| door_pattern;
117
118	root	1.3	newlayout[i * 2][j * 2] = '#';
119			if (i + 1 < xsize)
120			{
121			if (both_pattern & 1)
122			{ /* join walls/doors to the right */
123
124	elmex	1.1	/* newlayout[i2+1][j2] = '#'; */
125	root	1.3	newlayout[i * 2 + 1][j * 2] = layout[i + 1][j];
126			}
127	elmex	1.1	}
128
129	root	1.3	if (j + 1 < ysize)
130			{
131			if (both_pattern & 2)
132			{ /* join walls/doors to the bottom */
133
134	elmex	1.1	/* newlayout[i2][j2+1] = '#'; */
135	root	1.3	newlayout[i * 2][j * 2 + 1] = layout[i][j + 1];
136			}
137	elmex	1.1
138	root	1.3	if (wall_pattern == 7)
139			{ /* if orig layout is a 2x2 wall block,
140			* we fill the result with walls. */
141			newlayout[i * 2 + 1][j * 2 + 1] = '#';
142			}
143	elmex	1.1	}
144			}
145
146			/* This function will try to sensibly connect doors so that they meet up with
147			* adjacent walls. Note that it will also presumptuously delete (ignore) doors
148			* that it doesn't know how to correctly expand.
149			*/
150	root	1.3	static void
151			expand_door (char newlayout, int i, int j, char layout, int xsize, int ysize)
152			{
153			int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize);
154			int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize);
155	elmex	1.1	int join_pattern;
156
157			/* Doors "like" to connect to walls more than other doors. If there is
158			* a wall and another door, this door will connect to the wall and
159			* disconnect from the other door. */
160	root	1.3	if (wall_pattern & 3)
161			{
162			join_pattern = wall_pattern;
163			}
164			else
165			{
166			join_pattern = door_pattern;
167			}
168
169			newlayout[i * 2][j * 2] = 'D';
170			if (i + 1 < xsize)
171			{
172			if (join_pattern & 1)
173			{ /* there is a door/wall to the right */
174			newlayout[i * 2 + 1][j * 2] = 'D';
175			}
176			}
177
178			if (j + 1 < ysize)
179			{
180			if (join_pattern & 2)
181			{ /* there is a door/wall below */
182			newlayout[i * 2][j * 2 + 1] = 'D';
183			}
184	elmex	1.1	}
185			}