From 29f2394ecbb6586965bf86e26e989b4e3f150329 Mon Sep 17 00:00:00 2001
From: tamasmeszaros <meszaros.q@gmail.com>
Date: Tue, 10 Mar 2020 13:31:27 +0100
Subject: [PATCH] Fix faulty nfp edge cache with argument > 1.0

in reaction to #3781
---
 src/libnest2d/include/libnest2d/placers/nfpplacer.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libnest2d/include/libnest2d/placers/nfpplacer.hpp b/src/libnest2d/include/libnest2d/placers/nfpplacer.hpp
index e44e1dae1..91f04cb93 100644
--- a/src/libnest2d/include/libnest2d/placers/nfpplacer.hpp
+++ b/src/libnest2d/include/libnest2d/placers/nfpplacer.hpp
@@ -278,6 +278,8 @@ template<class RawShape> class EdgeCache {
 
     inline Vertex coords(const ContourCache& cache, double distance) const {
         assert(distance >= .0 && distance <= 1.0);
+        if (cache.distances.empty() || cache.emap.empty()) return Vertex{};
+        if (distance > 1.0) distance = std::fmod(distance, 1.0);
 
         // distance is from 0.0 to 1.0, we scale it up to the full length of
         // the circumference