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/* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
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snake-type layout. |
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|
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input: xsize, ysize; |
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output: a char** array with # and . for closed and open respectively. |
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|
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a char value of 0 represents a blank space: a '#' is |
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a wall. |
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|
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*/ |
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|
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#include <stdio.h> |
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#include <global.h> |
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#include <time.h> |
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|
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|
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|
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char ** |
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make_snake_layout (int xsize, int ysize, int options) |
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{ |
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int i, j; |
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|
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/* allocate that array, set it up */ |
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char **maze = (char **) calloc (sizeof (char *), xsize); |
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|
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for (i = 0; i < xsize; i++) |
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{ |
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maze[i] = (char *) calloc (sizeof (char), ysize); |
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} |
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|
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/* write the outer walls */ |
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for (i = 0; i < xsize; i++) |
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maze[i][0] = maze[i][ysize - 1] = '#'; |
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for (j = 0; j < ysize; j++) |
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maze[0][j] = maze[xsize - 1][j] = '#'; |
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|
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/* Bail out if the size is too small to make a snake. */ |
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if (xsize < 8 || ysize < 8) |
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return maze; |
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|
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/* decide snake orientation--vertical or horizontal , and |
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make the walls and place the doors. */ |
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|
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if (RANDOM () % 2) |
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{ /* vertical orientation */ |
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int n_walls = RANDOM () % ((xsize - 5) / 3) + 1; |
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int spacing = xsize / (n_walls + 1); |
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int orientation = 1; |
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|
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for (i = spacing; i < xsize - 3; i += spacing) |
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{ |
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if (orientation) |
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{ |
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for (j = 1; j < ysize - 2; j++) |
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{ |
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maze[i][j] = '#'; |
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} |
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maze[i][j] = 'D'; |
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} |
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else |
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{ |
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for (j = 2; j < ysize; j++) |
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{ |
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maze[i][j] = '#'; |
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} |
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maze[i][1] = 'D'; |
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} |
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orientation ^= 1; /* toggle the value of orientation */ |
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} |
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} |
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else |
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{ /* horizontal orientation */ |
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int n_walls = RANDOM () % ((ysize - 5) / 3) + 1; |
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int spacing = ysize / (n_walls + 1); |
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int orientation = 1; |
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|
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for (i = spacing; i < ysize - 3; i += spacing) |
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{ |
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if (orientation) |
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{ |
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for (j = 1; j < xsize - 2; j++) |
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{ |
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maze[j][i] = '#'; |
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} |
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maze[j][i] = 'D'; |
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} |
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else |
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{ |
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for (j = 2; j < xsize; j++) |
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{ |
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maze[j][i] = '#'; |
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} |
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maze[1][i] = 'D'; |
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} |
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orientation ^= 1; /* toggle the value of orientation */ |
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} |
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} |
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|
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/* place the exit up/down */ |
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if (RANDOM () % 2) |
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{ |
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maze[1][1] = '<'; |
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maze[xsize - 2][ysize - 2] = '>'; |
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} |
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else |
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{ |
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maze[1][1] = '>'; |
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maze[xsize - 2][ysize - 2] = '<'; |
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} |
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|
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return maze; |
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} |
