X-Git-Url: https://plomlompom.com/repos/foo.html?a=blobdiff_plain;ds=sidebyside;f=src%2Fyx_uint16.h;h=d055a6d4c7a3df45ba1b4de482532bb42156f633;hb=00a7727e37e2d80ff115f03e7971a92c66edcd96;hp=a8707618cadb8ed1e8309f46ee960d5478962261;hpb=f222ace2f2441b21a3c29741483d8018294820a4;p=plomrogue
diff --git a/src/yx_uint16.h b/src/yx_uint16.h
index a870761..d055a6d 100644
--- a/src/yx_uint16.h
+++ b/src/yx_uint16.h
@@ -1,10 +1,33 @@
+/* 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
-struct yx_uint16 {
- uint16_t y;
- uint16_t x; };
+#include /* for uint8_t, uint16_t */
+
+
+
+/* Coordinates for maps of max. 65536x65536 cells. */
+struct yx_uint16
+{
+ uint16_t y;
+ uint16_t x;
+};
+
+
+
+/* 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);
+
+/* Return yx_uint16 coordinate one step from "yx" in direction "dir" (east: 'E',
+ * west: 'W', north: 'N', south: 'S'). An invalid dir leaves "yx" unchanged.
+ */
+extern struct yx_uint16 mv_yx_in_dir(char dir, struct yx_uint16 yx);
+
-extern char yx_uint16_cmp (struct yx_uint16, struct yx_uint16);
#endif