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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define HEIGHT 50
#define WIDTH 50
#define MAX_STEPS 50
#define NUM_WALKERS 100
enum direction {
UP,
LEFT,
RIGHT,
DOWN,
NUM_DIRS,
};
struct point {
int x;
int y;
};
int main(void)
{
bool map[HEIGHT][WIDTH];
for (int i = 0; i < HEIGHT; ++i) {
for (int j = 0; j < WIDTH; ++j) {
map[i][j] = false;
}
}
int start_x = WIDTH / 2;
int start_y = HEIGHT / 2;
int open_tiles = 1;
struct point open[HEIGHT * WIDTH];
struct point p = {.x = start_x, .y = start_y};
open[0] = p;
srand(time(NULL));
for (int i = 0; i < NUM_WALKERS; ++i) {
struct point curr_point = open[rand() % open_tiles];
int x_pos = curr_point.x;
int y_pos = curr_point.y;
for (int j = 0; j < MAX_STEPS && x_pos < WIDTH && x_pos >= 0 &&
y_pos < HEIGHT && y_pos >= 0;
++j) {
if (!map[y_pos][x_pos]) {
map[y_pos][x_pos] = true;
struct point p = {.x = x_pos, .y = y_pos};
open[open_tiles++] = p;
}
enum direction dir = rand() % NUM_DIRS;
switch (dir) {
case UP : --y_pos; break;
case LEFT : --x_pos; break;
case RIGHT : ++x_pos; break;
case DOWN : ++y_pos; break;
default : exit(EXIT_FAILURE); // should not occur
}
}
}
for (int i = 0; i < HEIGHT; ++i) {
for (int j = 0; j < WIDTH; ++j) {
if (map[i][j]) {
printf("#");
} else {
printf(".");
}
}
printf("\n");
}
}
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