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#include "cavegen.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#define MAX_STEPS 200
#define NUM_WALKERS 100
enum direction {
UP,
LEFT,
RIGHT,
DOWN,
NUM_DIRS,
};
void create_cave(
enum tile_type **map, struct point **open_tiles, int *num_open_tiles,
struct point *up, struct point *down
)
{
// create a map consisting entirely of walls
*map = malloc(sizeof(enum tile_type) * HEIGHT * WIDTH);
for (int i = 0; i < HEIGHT; ++i) {
for (int j = 0; j < WIDTH; ++j) {
(*map)[i * WIDTH + j] = WALL;
}
}
// start in the middle of the screen
int start_x = WIDTH / 2;
int start_y = HEIGHT / 2;
// make the starting point GROUND
(*map)[start_y * WIDTH + start_x] = GROUND;
*open_tiles = malloc(sizeof(struct point) * HEIGHT * WIDTH);
*num_open_tiles = 1;
(*open_tiles)[0].x = start_x;
(*open_tiles)[0].y = start_y;
for (int i = 0; i < NUM_WALKERS; ++i) {
// get a random open point
struct point curr_point = (*open_tiles)[rand() % *num_open_tiles];
int x_pos = curr_point.x;
int y_pos = curr_point.y;
// iterate until the walk exits the array or MAX_STEPS is reached
for (int j = 1; j < MAX_STEPS - 1 && x_pos < WIDTH - 1 && x_pos >= 1 &&
y_pos < HEIGHT - 1 && y_pos >= 1;
++j) {
// add new open point if the current point is still a wall
if ((*map)[y_pos * WIDTH + x_pos] == WALL) {
(*open_tiles)[*num_open_tiles].x = x_pos;
(*open_tiles)[*num_open_tiles].y = y_pos;
++(*num_open_tiles);
}
(*map)[y_pos * WIDTH + x_pos] = GROUND; // assign ground
// move in a random direction
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
}
}
}
// assign the up stair and remove from open tiles
int in = rand() % *num_open_tiles;
*up = (*open_tiles)[in];
(*open_tiles)[in] = (*open_tiles)[*num_open_tiles - 1];
--(*num_open_tiles);
(*map)[up->y * WIDTH + up->x] = UP_STAIR;
// assign the down stair and remove from open tiles
in = rand() % *num_open_tiles;
*down = (*open_tiles)[in];
(*open_tiles)[in] = (*open_tiles)[*num_open_tiles - 1];
--(*num_open_tiles);
(*map)[down->y * WIDTH + down->x] = DOWN_STAIR;
}
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