Added support for conrolling point size into slideshow3D.

examples/slideshow3D/GNUmakefile

@@ -4,6 +4,7 @@ include $(TOPDIR)/Make/makedefs
 CXXFILES =\
         SlideShowConstructor.cpp\
         SlideEventHandler.cpp\
+        PointsEventHandler.cpp\
         DefaultPresentation.cpp\
         ReaderWriterXML.cpp\
 	slideshow3D.cpp\

examples/slideshow3D/PointsEventHandler.cpp

@@ -0,0 +1,79 @@
+/* -*-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.
+*/
+
+#include "PointsEventHandler.h"
+
+PointsEventHandler::PointsEventHandler()
+{
+    _point = new osg::Point;
+    //_point->setDistanceAttenuation(osg::Vec3(0.0,0.0005,0.0f));
+    _point->setDistanceAttenuation(osg::Vec3(0.0,0.0000,0.000005f));
+}
+
+bool PointsEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
+{
+    switch(ea.getEventType())
+    {
+        case(osgGA::GUIEventAdapter::KEYDOWN):
+        {
+            if (ea.getKey()=='+' || ea.getKey()==osgGA::GUIEventAdapter::KEY_KP_Add)
+            {
+               changePointSize(1.0f);
+               return true;
+            }
+            else if (ea.getKey()=='-' || ea.getKey()==osgGA::GUIEventAdapter::KEY_KP_Subtract)
+            {
+               changePointSize(-1.0f);
+               return true;
+            }
+            break;
+        }
+        default:
+            break;
+    }
+    return false;
+}
+
+void PointsEventHandler::accept(osgGA::GUIEventHandlerVisitor& v)
+{
+    v.visit(*this);
+}
+
+void PointsEventHandler::getUsage(osg::ApplicationUsage& usage) const
+{
+    usage.addKeyboardMouseBinding("+","Increase point size");
+    usage.addKeyboardMouseBinding("-","Reduce point size");
+}
+
+float PointsEventHandler::getPointSize() const
+{
+    return _point->getSize();
+}
+
+void PointsEventHandler::setPointSize(float psize)
+{
+    if (psize>0.0)
+    {
+        _point->setSize(psize);
+        _stateset->setAttribute(_point.get());
+    }
+    else
+    {
+        _stateset->setAttribute(_point.get(),osg::StateAttribute::INHERIT);
+    }
+    std::cout<<"Point size "<<psize<<std::endl;
+}
+
+void PointsEventHandler::changePointSize(float delta)
+{
+    setPointSize(getPointSize()+delta);
+}

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

examples/slideshow3D/SlideEventHandler.h

@@ -1,10 +1,9 @@
 /* -*-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 OpenSceneGraph Public License (OSGPL) version 0.0 or 
- * (at your option) any later version.  The full license is in LICENSE file
- * included with this distribution, and on the openscenegraph.org website.
- * 
+ * 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 
@@ -79,6 +78,4 @@ class SlideEventHandler : public osgGA::GUIEventHandler
 
 };
 
-
-
 #endif

examples/slideshow3D/slideshow3D.cpp

@@ -1,19 +1,21 @@
 /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
  *
- * This application is open source and may be redistributed and/or modified   
- * freely and without restriction, both in commericial and non commericial applications,
- * as long as this copyright notice is maintained.
- * 
- * This application is distributed in the hope that it will be useful,
+ * 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
 */
 
 #include <osgDB/ReadFile>
 #include <osgUtil/Optimizer>
 #include <osgProducer/Viewer>
 
 #include "SlideEventHandler.h"
+#include "PointsEventHandler.h"
 
 extern osg::Node* createDefaultPresentation();
 
@@ -25,7 +27,7 @@ int main( int argc, char **argv )
 
     // set up the usage document, in case we need to print out how to use this program.
     arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
-    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the application for presenting 3D interactive slide shows.");
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
     arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
     arguments.getApplicationUsage()->addCommandLineOption("-a","Turn auto stepping on by default");
@@ -38,9 +40,6 @@ int main( int argc, char **argv )
     // set up the value with sensible default event handlers.
     viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
 
-    // get details on keyboard and mouse bindings used by the viewer.
-    viewer.getUsage(*arguments.getApplicationUsage());
-
     // read any time delay argument.
     float timeDelayBetweenSlides = 1.5f;
     while (arguments.read("-d",timeDelayBetweenSlides)) {}
@@ -55,6 +54,13 @@ int main( int argc, char **argv )
     seh->setAutoSteppingActive(autoSteppingActive);
     seh->setTimeDelayBetweenSlides(timeDelayBetweenSlides);
 
+    // register the handler for modifying the point size
+    PointsEventHandler* peh = new PointsEventHandler;
+    viewer.getEventHandlerList().push_front(peh);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
     // if user request help write it out to cout.
     if (arguments.read("-h") || arguments.read("--help"))
     {
@@ -106,6 +112,10 @@ int main( int argc, char **argv )
     // set the scene to render
     viewer.setSceneData(loadedModel.get());
 
+    // pass the global stateset to the point event handler so that it can
+    // alter the point size of all points in the scene.
+    peh->setStateSet(viewer.getGlobalStateSet());
+
     // create the windows and run the threads.
     viewer.realize();