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Introduced a TerrainHandler that adjust the sameple ratio and vertical scale

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of terrain interactively using the 'r','R' and 'v','V' keys respecitvely.
This commit is contained in:
Robert Osfield 2008-05-27 15:28:39 +00:00
parent 1519d0d546
commit aee0e8dc37
1 changed files with 64 additions and 1 deletions
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65
examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
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@ -181,6 +181,58 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
};
// 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 )
{
// use an ArgumentParser object to manage the program arguments.
@ -188,6 +240,12 @@ int main( int argc, char **argv )
// 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)) {}
// add all the event handlers to the viewer
@ -259,11 +317,16 @@ int main( int argc, char **argv )
{
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);
unsigned int numLayers = 1;