Added support for conrolling point size into slideshow3D.

examples/slideshow3D/PointsEventHandler.h

@@ -0,0 +1,49 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the GNU Public License (GPL) version 1.0 or 
+ * (at your option) any later version. 
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef POINTSEVENTHANDLER
+#define POINTSEVENTHANDLER 1
+
+#include <osg/StateSet>
+#include <osg/Point>
+
+#include <osgGA/GUIEventHandler>
+
+class PointsEventHandler : public osgGA::GUIEventHandler
+{
+    public:
+        PointsEventHandler();
+    
+        virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&);
+        
+        virtual void accept(osgGA::GUIEventHandlerVisitor& v);
+        
+        void getUsage(osg::ApplicationUsage& usage) const;
+        
+        void setStateSet(osg::StateSet* stateset) { _stateset=stateset; }
+        
+        osg::StateSet* getStateSet() { return _stateset.get(); }
+        
+        const osg::StateSet* getStateSet() const { return _stateset.get(); }
+        
+        void setPointSize(float psize);
+
+        float getPointSize() const;
+        
+        void changePointSize(float delta);
+        
+        osg::ref_ptr<osg::StateSet> _stateset;
+        osg::ref_ptr<osg::Point>    _point;
+
+};
+
+#endif