X-Git-Url: https://plomlompom.com/repos/foo.html?a=blobdiff_plain;f=src%2Fyx_uint16.h;h=29298e5ded0f4b97f79f12d2d5e3d04b5b934a37;hb=7e4f2cac6f5248676ad28017031605a5f1500098;hp=c1479c0054c1c035b03b437c190fed0253514f77;hpb=64e1bc2a874308530b7b45c33ed5d37f34f5f8be;p=plomrogue
diff --git a/src/yx_uint16.h b/src/yx_uint16.h
index c1479c0..29298e5 100644
--- a/src/yx_uint16.h
+++ b/src/yx_uint16.h
@@ -1,6 +1,38 @@
-struct yx_uint16 {
- uint16_t y;
- uint16_t x; };
+/* yx_uint16.h
+ *
+ * Structs and routines for coordinates and movement in 2-dimensional space
+ * (such as the ncurses screen and game maps).
+ */
-extern char yx_uint16_cmp (struct yx_uint16, struct yx_uint16);
+#ifndef YX_UINT16_H
+#define YX_UINT16_H
+
+
+#include /* for 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 a and b are equal, else 0. */
+extern char yx_uint16_cmp(struct yx_uint16 a, struct yx_uint16 b);
+
+/* Return yx_uint16 coordinate one step from coordinate yx in direction dir. */
+extern struct yx_uint16 mv_yx_in_dir(enum dir d, struct yx_uint16 yx);
+
+#endif