rnd-20040206-B-src

[rocksndiamonds.git] / src / libgame / system.h

diff --git a/src/libgame/system.h b/src/libgame/system.h
index 086f01c2aa11a5a73627878f7fca9f54c1831e82..f39eb1b1a546d4ab450160a008819f5562a0a2f3 100644 (file)
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -116,6 +116,11 @@
                                 (x) == MV_RIGHT ? MV_BIT_RIGHT :       \
                                 (x) == MV_UP    ? MV_BIT_UP    : MV_BIT_DOWN)
 
+#define MV_DIR_OPPOSITE(x)     ((x) == MV_LEFT  ? MV_RIGHT :           \
+                                (x) == MV_RIGHT ? MV_LEFT  :           \
+                                (x) == MV_UP    ? MV_DOWN  :           \
+                                (x) == MV_DOWN  ? MV_UP    : MV_NO_MOVING)
+
 
 /* values for animation mode (frame order and direction) */
 #define ANIM_NONE              0