From 3c4f2d82d926c9c19ece4c37e916c8debafa1d3c Mon Sep 17 00:00:00 2001
From: Radu Ursu <Radu.Ursu@sophia.inria.fr>
Date: Tue, 11 Feb 2003 10:09:44 +0000
Subject: [PATCH] fixed bug in new_window when tr1.number_of_vertices() <= 1

---
 .../Triangulation_2/triangulation_2.C         | 28 ++++++++++---------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/Packages/Qt_widget/demo/Qt_widget/Triangulation_2/triangulation_2.C b/Packages/Qt_widget/demo/Qt_widget/Triangulation_2/triangulation_2.C
index 33054655a05..6492feb5f97 100644
--- a/Packages/Qt_widget/demo/Qt_widget/Triangulation_2/triangulation_2.C
+++ b/Packages/Qt_widget/demo/Qt_widget/Triangulation_2/triangulation_2.C
@@ -231,19 +231,21 @@ private slots:
     Window *ed = new Window(500, 500);
     ed->setCaption("Layer");
     ed->show();
-    Vertex_iterator it = tr1.vertices_begin();
-    xmin = xmax = (*it).point().x();
-    ymin = ymax = (*it).point().y();
-    while(it != tr1.vertices_end()) {
-      if(xmin > (*it).point().x())
-	xmin = (*it).point().x();
-      if(xmax < (*it).point().x())
-	xmax = (*it).point().x();
-      if(ymin > (*it).point().y())
-	ymin = (*it).point().y();
-      if(ymax < (*it).point().y())
-	ymax = (*it).point().y();
-      it++;
+    if(tr1.number_of_vertices() > 1){
+      Vertex_iterator it = tr1.vertices_begin();
+      xmin = xmax = (*it).point().x();
+      ymin = ymax = (*it).point().y();
+      while(it != tr1.vertices_end()) {
+        if(xmin > (*it).point().x())
+	  xmin = (*it).point().x();
+        if(xmax < (*it).point().x())
+	  xmax = (*it).point().x();
+        if(ymin > (*it).point().y())
+	  ymin = (*it).point().y();
+        if(ymax < (*it).point().y())
+	  ymax = (*it).point().y();
+        it++;
+      }
     }
     ed->set_window(xmin, xmax, ymin, ymax);
     something_changed();