From b51d11d0434955dc5863d5b49a8d9423d9b2bce0 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Thu, 1 Jul 2010 21:24:39 +0000
Subject: [PATCH] catch a few error conditions for extrudes and polygons

git-svn-id: svn://anubis/fart/trunk@271 7f9b0f55-74a9-4bce-be96-3c2cd072584d
---
 main/Scene-load.cc | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/main/Scene-load.cc b/main/Scene-load.cc
index 69b657e..a8d077a 100644
--- a/main/Scene-load.cc
+++ b/main/Scene-load.cc
@@ -569,6 +569,11 @@ refptr<Shape> Scene::processExtrude(refptr<Node> node)
         else if ( typeid(**it) == typeid(OffsetNode) )
         {
             double distance = (*it)->getNumber();
+            if (distance <= 0.0)
+            {
+                cerr << "Error: extrude distance must be positive" << endl;
+                exit(3);
+            }
             Vector scale(1, 1, 1);
             Vector position(0, 0, 0);
             for (Node_Iterator it2 = (*it)->getChildren().begin();
@@ -584,6 +589,11 @@ refptr<Shape> Scene::processExtrude(refptr<Node> node)
                     position = * (*it2)->getVector();
                 }
             }
+            if (scale[0] < 0.0 || scale[1] < 0.0)
+            {
+                cerr << "Error: extrude scale cannot be negative" << endl;
+                exit(3);
+            }
             extrude->addOffset(distance, scale, position);
         }
         else if ( (*it)->isMaterial() )
@@ -619,6 +629,11 @@ refptr<Polygon> Scene::processPolygon(refptr<Node> node)
             exit(3);
         }
     }
+    if (p->size() < 3)
+    {
+        cerr << "Error: Polygon with fewer than three points!" << endl;
+        exit(3);
+    }
     return p;
 }