X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=mgraph.h;h=63fd5dca82ae60e4a78d865bcbb3cdad71a04527;hb=7bc1fc859f691dbd2194883ed3160411a082bbc8;hp=2267fdbda1ffcf59bbf7a9919c651bee46ffa6b0;hpb=b45f8ea848f5c92004637a794720d5f014077142;p=moebius2.git

diff --git a/mgraph.h b/mgraph.h
index 2267fdb..63fd5dc 100644
--- a/mgraph.h
+++ b/mgraph.h
@@ -129,10 +129,13 @@ int edge_reverse(int v1, int e);
   FOR_VERTEX((v1), loop)			\
     FOR_VEDGE((v1),(e),(v2))
 
-#define FOR_RIM_VERTEX(vy,vx,v, loop)		\
-  for ((vy)=0; (vy)<Y; (vy)+=Y-1)		\
+#define FOR_NEAR_RIM_VERTEX(vy,vx,v, disttorim, loop)		\
+  for ((vy)=(disttorim); (vy)<Y; (vy)+=Y-1-2*(disttorim))	\
     loop ((vx), 0, X, (v)= (vy)<<YSHIFT | (vx))
 
+#define FOR_RIM_VERTEX(vy,vx,v, loop)		\
+  FOR_NEAR_RIM_VERTEX((vy),(vx),(v), 0, loop)
+
 int vertices_span_join_p(int v0, int v1);
 
 typedef double Vertices[N][D3];