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#include "cavegen.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define HEIGHT 100
#define WIDTH 180
#define MAX_STEPS 200
#define NUM_WALKERS 100
enum direction {
UP,
LEFT,
RIGHT,
DOWN,
NUM_DIRS,
};
void create_cave(bool **map, struct point **open, int *open_tiles)
{
srand(time(NULL));
*map = malloc(sizeof(bool) * HEIGHT * WIDTH);
for (int i = 0; i < HEIGHT; ++i) {
for (int j = 0; j < WIDTH; ++j) {
(*map)[i * WIDTH + j] = false;
}
}
int start_x = WIDTH / 2;
int start_y = HEIGHT / 2;
*open_tiles = 1;
*open = malloc(sizeof(struct point) * HEIGHT * WIDTH);
struct point p = {.x = start_x, .y = start_y};
(*open)[0] = p;
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 = 1; j < MAX_STEPS - 1 && x_pos < WIDTH - 1 && x_pos >= 1 &&
y_pos < HEIGHT - 1 && y_pos >= 1;
++j) {
if (!((*map)[y_pos * WIDTH + x_pos])) {
(*map)[y_pos * WIDTH + 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 < 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 = 1; j < MAX_STEPS - 1 && x_pos < WIDTH - 1 && x_pos >= 1 &&
y_pos < HEIGHT - 1 && y_pos >= 1;
++j) {
if (!((*map)[y_pos * WIDTH + x_pos])) {
(*map)[y_pos * WIDTH + 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
}
}
}
}
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