X-Git-Url: https://plomlompom.com/repos/index.html?a=blobdiff_plain;f=src%2Fyx_uint16.h;h=86812f4ed03e1a14e32e65645d5278910096cdca;hb=7290dec4219eaa2325aa00ef6139f715743dba3a;hp=4751b683719636220275e2d4af3ac420d63ce13e;hpb=b944d403e356e444b47b0f5768406c0527151be0;p=plomrogue
diff --git a/src/yx_uint16.h b/src/yx_uint16.h
index 4751b68..86812f4 100644
--- a/src/yx_uint16.h
+++ b/src/yx_uint16.h
@@ -1,18 +1,47 @@
+/* yx_uint16.h
+ *
+ * Structs and routines for coordinates and movement in 2-dimensional space
+ * (such as the ncurses screen and game maps).
+ */
+
#ifndef YX_UINT16_H
#define YX_UINT16_H
-#include
+#include /* for uint8_t, uint16_t */
+
+
+
+/* Coordinates for maps of max. 65536x65536 cells. */
+struct yx_uint16
+{
+ uint16_t y;
+ uint16_t x;
+};
+
+
+
+/* Directions available for movement. */
+enum dir
+{
+ NORTH = 1,
+ EAST,
+ SOUTH,
+ WEST
+};
+
+
+
+/* Return 1 if two yx_uint16 coordinates at "a" and "b" are equal, else 0. */
+extern uint8_t yx_uint16_cmp(struct yx_uint16 * a, struct yx_uint16 * b);
+
+
-#define NORTH 1
-#define EAST 2
-#define SOUTH 3
-#define WEST 4
+/* Return yx_uint16 coordinate one step from coordinate yx in direction dir.
+ *
+ * If an invalid dir "d" is passed, "yx" remains unchanged.
+ */
+extern struct yx_uint16 mv_yx_in_dir(enum dir d, struct yx_uint16 yx);
-struct yx_uint16 {
- uint16_t y;
- uint16_t x; };
-extern char yx_uint16_cmp (struct yx_uint16, struct yx_uint16);
-extern struct yx_uint16 mv_yx_in_dir (char, struct yx_uint16);
#endif