From 36c71eb583751f37e3b7701deaa25610e6e7c17e Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 27 Mar 2022 20:44:45 +0200
Subject: [PATCH] prevent a crash when entering '(0,0)' in Archimedean

---
 archimedean.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/archimedean.cpp b/archimedean.cpp
index f3580da6..ac1baa56 100644
--- a/archimedean.cpp
+++ b/archimedean.cpp
@@ -1439,6 +1439,10 @@ EX void show() {
 void archimedean_tiling::get_nom_denom(int& anom, int& adenom) {
   int nom = 2 - N, denom = 2;
   for(int f: faces) {
+    if(f == 0) {
+      /* prevent a crash */
+      anom = 1; adenom = 1; return;
+      }
     int g = gcd(denom, f);
     nom = (nom * f + denom) / g;
     denom = denom / g * f;