added Polygon::add(), Polygon::containsPoint(); initial attempt at rendering Extrude objects

git-svn-id: svn://anubis/fart/trunk@272 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Scene-load.cc

@@ -642,15 +642,19 @@ refptr<Polygon> Scene::processNGon(refptr<Node> node)
     refptr<Polygon> p = new Polygon();
     double radius = node->getChildren()[0]->getNumber();
     int n = node->getInteger();
+    int step = n < 0 ? -1 : 1;
+    n = abs(n);
     if (n < 3)
         n = 3;
+    int pos = 0;
     double astep = 2.0 * M_PI / n;
     for (int i = 0; i < n; i++)
     {
         p->push_back(new Vector(
-                    radius * cos(i * astep),
-                    radius * sin(i * astep),
+                    radius * cos(pos * astep),
+                    radius * sin(pos * astep),
                     0.0));
+        pos += step;
     }
     return p;
 }