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