From 63e855562c5f4e25f18744df652632d3400063dc Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Thu, 28 Apr 2022 08:23:07 +0200
Subject: [PATCH] fixed the problem where apeirogons got outside boundary

---
 arbitrile.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arbitrile.cpp b/arbitrile.cpp
index e6c18504..13780edc 100644
--- a/arbitrile.cpp
+++ b/arbitrile.cpp
@@ -1234,7 +1234,7 @@ struct hrmap_arbi : hrmap {
   hyperpoint get_corner(cell *c, int cid, ld cf) override {
     auto& sh = arb::current_or_slided().shapes[arb::id_of(c->master)];
     int id = gmod(cid, c->type);
-    if(sh.angles[id] <= 0)
+    if(sh.angles[gmod(id-1, c->type)] <= 0)
       return sh.vertices[id];
     return normalize(C0 + (sh.vertices[id] - C0) * 3 / cf);
     }