sctoff2xy(): New, factored out of sct_oninit()

[empserver] / src / lib / common / xy.c

diff --git a/src/lib/common/xy.c b/src/lib/common/xy.c
index 5bcdc407cfc870b9663ba007b451988bf6612237..ba34ccc60c1842ad80e3e775a150fab2df666a4c 100644 (file)
--- a/src/lib/common/xy.c
+++ b/src/lib/common/xy.c
@@ -28,7 +28,7 @@
  *
  *  Known contributors to this file:
  *     Dave Pare, 1989
- *     Markus Armbruster, 2004-2011
+ *     Markus Armbruster, 2004-2013
  */
 
 #include <config.h>
@@ -208,6 +208,12 @@ sctoff(coord x, coord y)
     return XYOFFSET(XNORM(x), YNORM(y));
 }
 
+void sctoff2xy(coord *x, coord *y, int off)
+{
+    *y = off * 2 / WORLD_X;
+    *x = off * 2 % WORLD_X + *y % 2;
+}
+
 coord
 xnorm(coord x)
 {