Added support for conrolling point size into slideshow3D.

2003-09-14 22:11:16 +00:00
parent 02bde1b175
commit a54537558c
5 changed files with 152 additions and 16 deletions
--- a/examples/slideshow3D/PointsEventHandler.cpp
+++ b/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);
+}