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Rewrite generate procedure to be iterative instead of recursive

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Camden Dixie O'Brien 2024-11-04 22:08:11 +00:00
parent c2a043a8b1
commit 0720b2c0c2
1 changed files with 46 additions and 31 deletions
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77
main.c
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@ -26,6 +26,8 @@
#define GOAL (GRID_SIZE - 1)
#define MAX_PATH_LENGTH (MAZE_SIZE * MAZE_SIZE)
#define STACK_SIZE (MAZE_SIZE * MAZE_SIZE)
typedef enum { LEFT, RIGHT, UP, DOWN } dir_t;
typedef struct {
@ -75,41 +77,54 @@ static void draw_visited(vec2_t p)
XFlush(dpy);
}
static void generate(vec2_t start)
static bool in_bounds(vec2_t p)
{
dir_t visit[] = { LEFT, RIGHT, UP, DOWN };
for (int i = 3; i > 0; --i) {
const int r = rand() % (i + 1);
const dir_t tmp = visit[r];
visit[r] = visit[i];
visit[i] = tmp;
}
const bool valid_x = p.x >= 0 && p.x < GRID_SIZE;
const bool valid_y = p.y >= 0 && p.y < GRID_SIZE;
return valid_x && valid_y;
}
static bool finished_gen(vec2_t p)
{
vec2_t n;
for (int i = 0; i < 4; ++i) {
const vec2_t next = {
.x = start.x + steps[visit[i]].x,
.y = start.y + steps[visit[i]].y,
};
const vec2_t im = {
.x = (start.x + next.x) / 2,
.y = (start.y + next.y) / 2,
};
const bool x_in_bounds = next.x >= 0 && next.x < GRID_SIZE;
const bool y_in_bounds = next.y >= 0 && next.y < GRID_SIZE;
if (x_in_bounds && y_in_bounds) {
const bool is_wall = !maze[next.x][next.y].is_path;
if (is_wall) {
maze[next.x][next.y].is_path = true;
clear_path(next);
maze[im.x][im.y].is_path = true;
clear_path(im);
nanosleep(&gen_pause, NULL);
generate(next);
}
}
n.x = p.x + steps[i].x;
n.y = p.y + steps[i].y;
if (in_bounds(n) && !maze[n.x][n.y].is_path)
return false;
}
return true;
}
static void generate(vec2_t p)
{
vec2_t stack[STACK_SIZE], *sp = stack;
do {
if (finished_gen(p)) {
p = *(--sp);
continue;
}
vec2_t n;
do {
dir_t d = rand() % 4;
n.x = p.x + steps[d].x;
n.y = p.y + steps[d].y;
} while (!in_bounds(n) || maze[n.x][n.y].is_path);
const vec2_t im = {
.x = (p.x + n.x) / 2,
.y = (p.y + n.y) / 2,
};
maze[im.x][im.y].is_path = maze[n.x][n.y].is_path = true;
clear_path(im);
clear_path(n);
*sp++ = p;
p = n;
nanosleep(&gen_pause, NULL);
} while (sp != stack);
}
static bool solve(vec2_t start, vec2_t *path, vec2_t **end)