Moved more stuff into yx_uint16 library.

[plomrogue] / src / yx_uint16.c

diff --git a/src/yx_uint16.c b/src/yx_uint16.c
index afcab4db7a17d064a1faa36890576845bbd572b3..0d607cb9da63eca1aace7ffaaa9c762d7028478d 100644 (file)
--- a/src/yx_uint16.c
+++ b/src/yx_uint16.c
@@ -6,3 +6,11 @@ extern char yx_uint16_cmp (struct yx_uint16 a, struct yx_uint16 b) {
   if (a.y == b.y && a.x == b.x) return 1;
   else                          return 0; }
 
+extern struct yx_uint16 mv_yx_in_dir (char d, struct yx_uint16 yx) {
+// Return yx coordinates one step to the direction d of yx.
+  if      (d == NORTH) yx.y--;
+  else if (d == EAST)  yx.x++;
+  else if (d == SOUTH) yx.y++;
+  else if (d == WEST)  yx.x--;
+  return yx; }
+