Changeset 8366 for OpenSceneGraph/trunk/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp

Timestamp:

05/27/08 17:28:39 (5 years ago)

Author:

robert

Message:

Introduced a TerrainHandler? that adjust the sameple ratio and vertical scale
of terrain interactively using the 'r','R' and 'v','V' keys respecitvely.

Files:

• OpenSceneGraph/trunk/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp (modified) (3 diffs)

OpenSceneGraph/trunk/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp

@@ -182 +182 @@
 
 
+// class to handle events with a pick
+class TerrainHandler : public osgGA::GUIEventHandler {
+public: 
+
+    TerrainHandler(osgTerrain::Terrain* terrain):
+        _terrain(terrain) {}
+    
+    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
+    {
+        switch(ea.getEventType())
+        {
+            case(osgGA::GUIEventAdapter::KEYDOWN):
+            {   
+                if (ea.getKey()=='r')
+                {
+                    _terrain->setSampleRatio(_terrain->getSampleRatio()*0.5);
+                    osg::notify(osg::NOTICE)<<"Sample ratio "<<_terrain->getSampleRatio()<<std::endl;
+                    return true;
+                }
+                else if (ea.getKey()=='R')
+                {
+                    _terrain->setSampleRatio(_terrain->getSampleRatio()/0.5);
+                    osg::notify(osg::NOTICE)<<"Sample ratio "<<_terrain->getSampleRatio()<<std::endl;
+                    return true;
+                }
+                else if (ea.getKey()=='v')
+                {
+                    _terrain->setVerticalScale(_terrain->getVerticalScale()*1.25);
+                    osg::notify(osg::NOTICE)<<"Vertical scale "<<_terrain->getVerticalScale()<<std::endl;
+                    return true;
+                }
+                else if (ea.getKey()=='V')
+                {
+                    _terrain->setVerticalScale(_terrain->getVerticalScale()/1.25);
+                    osg::notify(osg::NOTICE)<<"Vertical scale "<<_terrain->getVerticalScale()<<std::endl;
+                    return true;
+                }
+
+                return false;
+            }    
+            default:
+                return false;
+        }
+    }
+    
+protected:
+
+    ~TerrainHandler() {}
+
+    osg::ref_ptr<osgTerrain::Terrain>  _terrain;
+};
+
 int main( int argc, char **argv )
 {
@@ -189 +241 @@
     // construct the viewer.
     osgViewer::Viewer viewer(arguments);
+    
+    float verticalScale = 1.0f;
+    while(arguments.read("-v",verticalScale)) {}
+    
+    float sampleRatio = 1.0f;
+    while(arguments.read("-r",sampleRatio)) {}
 
 
@@ -260 +318 @@
             terrain = new osgTerrain::Terrain;
             terrain->addChild(rootnode);
-            terrain->setSampleRatio(0.25f);
 
             rootnode = terrain;
         }    
+
+        terrain->setSampleRatio(sampleRatio);
+        terrain->setVerticalScale(verticalScale);
+
+        // register our custom handler for adjust Terrain settings        
+        viewer.addEventHandler(new TerrainHandler(terrain));
 
         osg::CoordinateSystemNode* csn = findTopMostNodeOfType<osg::CoordinateSystemNode>(rootnode);