functioning mvp

1 files changed, 85 insertions, 0 deletions

diff --git a/cavegen.c b/cavegen.c
new file mode 100644
index 0000000..11a88cb
--- /dev/null
+++ b/cavegen.c
@@ -0,0 +1,85 @@
+#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
+            }
+        }
+    }
+}