From d55edeb312675c05c9c3005633db0d5b4c191eb2 Mon Sep 17 00:00:00 2001
From: eadf <ead.fritz@gmail.com>
Date: Sat, 20 Mar 2021 20:57:56 +0100
Subject: [PATCH] Fixed a bug with color_exterior()

---
 example/voronoi_visualizer.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/example/voronoi_visualizer.cpp b/example/voronoi_visualizer.cpp
index 3049c387..89464d35 100644
--- a/example/voronoi_visualizer.cpp
+++ b/example/voronoi_visualizer.cpp
@@ -179,6 +179,11 @@ class GLWidget : public QGLWidget {
       return;
     }
     edge->color(EXTERNAL_COLOR);
+    if (edge->vertex1() == NULL && edge->vertex0() != NULL) {
+      // This edge leads to nowhere
+      // It's important to *not* color twin in this case
+      return;
+    }
     edge->twin()->color(EXTERNAL_COLOR);
     const VD::vertex_type* v = edge->vertex1();
     if (v == NULL || !edge->is_primary()) {