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/* |
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* Expands a layout by 2x in each dimension. |
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* H. S. Teoh |
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* -------------------------------------------------------------------------- |
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* $Id: expand2x.C,v 1.3 2006-09-10 16:06:37 root Exp $ |
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* |
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* ALGORITHM |
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* |
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* ... (TBW) |
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*/ |
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|
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#include <stdlib.h> /* just in case */ |
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#include <expand2x.h> /* use compiler to do sanity check */ |
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|
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|
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/* PROTOTYPES */ |
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|
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static void expand_misc (char **newlayout, int i, int j, char **layout, int xsize, int ysize); |
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static void expand_wall (char **newlayout, int i, int j, char **layout, int xsize, int ysize); |
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static void expand_door (char **newlayout, int i, int j, char **layout, int xsize, int ysize); |
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|
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|
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/* FUNCTIONS */ |
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|
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char ** |
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expand2x (char **layout, int xsize, int ysize) |
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{ |
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int i, j; |
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int nxsize = xsize * 2 - 1; |
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int nysize = ysize * 2 - 1; |
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|
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/* Allocate new layout */ |
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char **newlayout = (char **) calloc (sizeof (char *), nxsize); |
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|
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for (i = 0; i < nxsize; i++) |
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{ |
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newlayout[i] = (char *) calloc (sizeof (char), nysize); |
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} |
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|
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for (i = 0; i < xsize; i++) |
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{ |
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for (j = 0; j < ysize; j++) |
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{ |
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switch (layout[i][j]) |
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{ |
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case '#': |
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expand_wall (newlayout, i, j, layout, xsize, ysize); |
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break; |
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case 'D': |
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expand_door (newlayout, i, j, layout, xsize, ysize); |
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break; |
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default: |
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expand_misc (newlayout, i, j, layout, xsize, ysize); |
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} |
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} |
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} |
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|
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/* Dump old layout */ |
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for (i = 0; i < xsize; i++) |
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{ |
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free (layout[i]); |
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} |
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free (layout); |
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|
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return newlayout; |
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} |
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|
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/* Copy the old tile X into the new one at location (i*2, j*2) and |
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* fill up the rest of the 2x2 result with \0: |
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* X ---> X \0 |
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* \0 \0 |
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*/ |
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static void |
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expand_misc (char **newlayout, int i, int j, char **layout, int xsize, int ysize) |
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{ |
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newlayout[i * 2][j * 2] = layout[i][j]; |
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/* (Note: no need to reset rest of 2x2 area to \0 because calloc does that |
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* for us.) */ |
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} |
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|
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/* Returns a bitmap that represents which squares on the right and bottom |
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* edges of a square (i,j) match the given character: |
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* 1 match on (i+1, j) |
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* 2 match on (i, j+1) |
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* 4 match on (i+1, j+1) |
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* and the possible combinations thereof. |
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*/ |
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static int |
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calc_pattern (char ch, char **layout, int i, int j, int xsize, int ysize) |
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{ |
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int pattern = 0; |
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|
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if (i + 1 < xsize && layout[i + 1][j] == ch) |
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pattern |= 1; |
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|
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if (j + 1 < ysize) |
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{ |
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if (layout[i][j + 1] == ch) |
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pattern |= 2; |
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if (i + 1 < xsize && layout[i + 1][j + 1] == ch) |
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pattern |= 4; |
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} |
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|
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return pattern; |
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} |
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|
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/* Expand a wall. This function will try to sensibly connect the resulting |
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* wall to adjacent wall squares, so that the result won't have disconnected |
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* walls. |
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*/ |
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static void |
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expand_wall (char **newlayout, int i, int j, char **layout, int xsize, int ysize) |
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{ |
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int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize); |
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int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize); |
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int both_pattern = wall_pattern | door_pattern; |
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|
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newlayout[i * 2][j * 2] = '#'; |
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if (i + 1 < xsize) |
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{ |
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if (both_pattern & 1) |
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{ /* join walls/doors to the right */ |
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|
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/* newlayout[i*2+1][j*2] = '#'; */ |
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newlayout[i * 2 + 1][j * 2] = layout[i + 1][j]; |
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} |
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} |
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|
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if (j + 1 < ysize) |
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{ |
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if (both_pattern & 2) |
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{ /* join walls/doors to the bottom */ |
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|
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/* newlayout[i*2][j*2+1] = '#'; */ |
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newlayout[i * 2][j * 2 + 1] = layout[i][j + 1]; |
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} |
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|
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if (wall_pattern == 7) |
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{ /* if orig layout is a 2x2 wall block, |
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* we fill the result with walls. */ |
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newlayout[i * 2 + 1][j * 2 + 1] = '#'; |
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} |
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} |
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} |
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|
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/* This function will try to sensibly connect doors so that they meet up with |
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* adjacent walls. Note that it will also presumptuously delete (ignore) doors |
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* that it doesn't know how to correctly expand. |
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*/ |
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static void |
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expand_door (char **newlayout, int i, int j, char **layout, int xsize, int ysize) |
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{ |
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int wall_pattern = calc_pattern ('#', layout, i, j, xsize, ysize); |
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int door_pattern = calc_pattern ('D', layout, i, j, xsize, ysize); |
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int join_pattern; |
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|
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/* Doors "like" to connect to walls more than other doors. If there is |
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* a wall and another door, this door will connect to the wall and |
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* disconnect from the other door. */ |
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if (wall_pattern & 3) |
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{ |
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join_pattern = wall_pattern; |
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} |
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else |
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{ |
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join_pattern = door_pattern; |
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} |
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|
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newlayout[i * 2][j * 2] = 'D'; |
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if (i + 1 < xsize) |
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{ |
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if (join_pattern & 1) |
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{ /* there is a door/wall to the right */ |
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newlayout[i * 2 + 1][j * 2] = 'D'; |
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} |
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} |
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|
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if (j + 1 < ysize) |
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{ |
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if (join_pattern & 2) |
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{ /* there is a door/wall below */ |
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newlayout[i * 2][j * 2 + 1] = 'D'; |
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} |
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} |
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} |
