9 int hexbin2(int horizontal, double width, double x, double y,
12 int hexbin(int horizontal, double width, double x, double y,
14 int hex_xy(struct hex *h);
15 int hex_iso(struct hex *h);
17 int hex_distance(struct hex *a, struct hex *b);
18 int hex_bearing(struct hex *a, struct hex *b);
19 int hex_at(struct hex *h, int distance, struct hex **list);
20 int hex_within(struct hex *h, int distance, struct hex **list);
21 int hex_dir(struct hex *h, int direction);