FGFS-4.1/OpenSceneGraph
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Added TerainHandler event handler to provide 'v'/'V' and 'r'/'R' key controls for change vertical scale and sample ratio respectively.

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This commit is contained in:
Robert Osfield 2010-03-29 08:49:20 +00:00
parent 8547536387
commit 31e526f253
1 changed files with 55 additions and 0 deletions
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55
examples/osgterrain/osgterrain.cpp
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@ -73,6 +73,58 @@ T* findTopMostNodeOfType(osg::Node* node)
return fnotv._foundNode;
}
// 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)
{
osg::ArgumentParser arguments(&argc, argv);
@ -156,6 +208,9 @@ int main(int argc, char** argv)
terrain->setVerticalScale(verticalScale);
terrain->setBlendingPolicy(blendingPolicy);
// register our custom handler for adjust Terrain settings
viewer.addEventHandler(new TerrainHandler(terrain));
// add a viewport to the viewer and attach the scene graph.
viewer.setSceneData( rootnode );