From 4648780eb184ed69cb38ccd61905fefe4233d76d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 26 Apr 2020 11:02:27 +0200
Subject: [PATCH] fixed Butterflies in non-orientable geometries

---
 monstermove.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/monstermove.cpp b/monstermove.cpp
index 6e0da9bc..0bb73239 100644
--- a/monstermove.cpp
+++ b/monstermove.cpp
@@ -354,8 +354,9 @@ EX int angledist(int t, int d1, int d2) {
   return dd;
   }
 
-EX int angledistButterfly(int t, int d1, int d2) {
+EX int angledistButterfly(int t, int d1, int d2, bool mirrored) {
   int dd = d1 - d2;
+  if(mirrored) dd = -dd;
   while(dd<0) dd += t;
   return dd;
   }
@@ -485,7 +486,7 @@ EX int moveval(cell *c1, cell *c2, int d, flagtype mf) {
   if(m == moBat && batsAfraid(c2)) return 790;
   
   if(m == moButterfly)
-    return 1500 + angledistButterfly(c1->type, c1->mondir, d);
+    return 1500 + angledistButterfly(c1->type, c1->mondir, d, c1->monmirror);
   
   if(m == moRagingBull && c1->mondir != NODIR)
     return 1500 - bulldist(c2);