From dd701e28fa81bed61d94a748b108c866ee18bca8 Mon Sep 17 00:00:00 2001
From: Maxime Gimeno <maxime.gimeno@gmail.com>
Date: Tue, 2 Jun 2020 14:08:03 +0200
Subject: [PATCH] Fix Delaunay point removal

---
 .../TriangulationPointInputAndConflictZone.h         | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/GraphicsView/demo/Triangulation_2/TriangulationPointInputAndConflictZone.h b/GraphicsView/demo/Triangulation_2/TriangulationPointInputAndConflictZone.h
index ce85d87d9c2..b387e314025 100644
--- a/GraphicsView/demo/Triangulation_2/TriangulationPointInputAndConflictZone.h
+++ b/GraphicsView/demo/Triangulation_2/TriangulationPointInputAndConflictZone.h
@@ -37,6 +37,7 @@ protected:
   Converter<K> convert;
   QGraphicsScene *scene_;
   Point p;
+  bool do_insert;
 };
 
 
@@ -44,7 +45,7 @@ template <typename T>
 TriangulationPointInputAndConflictZone<T>::TriangulationPointInputAndConflictZone(QGraphicsScene* s,
                                                         T * dt_,
                                                         QObject* parent)
-  :  GraphicsViewInput(parent), dt(dt_), scene_(s)
+  :  GraphicsViewInput(parent), dt(dt_), scene_(s), do_insert(true)
 {}
 
 
@@ -54,6 +55,12 @@ template <typename T>
 void
 TriangulationPointInputAndConflictZone<T>::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
+  if(event->modifiers()  & ::Qt::ShiftModifier){
+    do_insert = false;
+    return;
+  }
+  else
+    do_insert = true;
   p = convert(event->scenePos());
   if(dt->dimension() < 2 ||
      event->modifiers() != 0 ||
@@ -91,7 +98,8 @@ TriangulationPointInputAndConflictZone<T>::mouseReleaseEvent(QGraphicsSceneMouse
     delete *it;
   }
   qfaces.clear();
-  Q_EMIT( generate(CGAL::make_object(p)));
+  if(do_insert)
+    Q_EMIT( generate(CGAL::make_object(p)));
 }