240 lines
8.0 KiB
C++
240 lines
8.0 KiB
C++
/* OpenSceneGraph example, osgterrain.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osg/ArgumentParser>
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#include <osgDB/ReadFile>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgGA/TrackballManipulator>
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#include <osgGA/FlightManipulator>
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#include <osgGA/DriveManipulator>
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#include <osgGA/KeySwitchMatrixManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgGA/AnimationPathManipulator>
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#include <osgGA/TerrainManipulator>
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#include <osgTerrain/Terrain>
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#include <osgTerrain/TerrainTile>
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#include <osgTerrain/GeometryTechnique>
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#include <osgTerrain/Layer>
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#include <iostream>
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template<class T>
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class FindTopMostNodeOfTypeVisitor : public osg::NodeVisitor
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{
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public:
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FindTopMostNodeOfTypeVisitor():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
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_foundNode(0)
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{}
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void apply(osg::Node& node)
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{
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T* result = dynamic_cast<T*>(&node);
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if (result)
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{
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_foundNode = result;
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}
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else
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{
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traverse(node);
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}
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}
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T* _foundNode;
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};
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template<class T>
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T* findTopMostNodeOfType(osg::Node* node)
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{
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if (!node) return 0;
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FindTopMostNodeOfTypeVisitor<T> fnotv;
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node->accept(fnotv);
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return fnotv._foundNode;
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}
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// class to handle events with a pick
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class TerrainHandler : public osgGA::GUIEventHandler {
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public:
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TerrainHandler(osgTerrain::Terrain* terrain):
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_terrain(terrain) {}
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bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
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{
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYDOWN):
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{
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if (ea.getKey()=='r')
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{
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_terrain->setSampleRatio(_terrain->getSampleRatio()*0.5);
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osg::notify(osg::NOTICE)<<"Sample ratio "<<_terrain->getSampleRatio()<<std::endl;
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return true;
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}
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else if (ea.getKey()=='R')
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{
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_terrain->setSampleRatio(_terrain->getSampleRatio()/0.5);
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osg::notify(osg::NOTICE)<<"Sample ratio "<<_terrain->getSampleRatio()<<std::endl;
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return true;
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}
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else if (ea.getKey()=='v')
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{
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_terrain->setVerticalScale(_terrain->getVerticalScale()*1.25);
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osg::notify(osg::NOTICE)<<"Vertical scale "<<_terrain->getVerticalScale()<<std::endl;
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return true;
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}
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else if (ea.getKey()=='V')
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{
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_terrain->setVerticalScale(_terrain->getVerticalScale()/1.25);
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osg::notify(osg::NOTICE)<<"Vertical scale "<<_terrain->getVerticalScale()<<std::endl;
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return true;
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}
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return false;
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}
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default:
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return false;
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}
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}
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protected:
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~TerrainHandler() {}
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osg::ref_ptr<osgTerrain::Terrain> _terrain;
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};
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int main(int argc, char** argv)
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{
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osg::ArgumentParser arguments(&argc, argv);
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// construct the viewer.
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osgViewer::Viewer viewer(arguments);
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// set up the camera manipulators.
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{
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osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
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keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
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keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
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keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
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keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
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std::string pathfile;
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char keyForAnimationPath = '5';
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while (arguments.read("-p",pathfile))
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{
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osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
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if (apm || !apm->valid())
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{
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unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
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keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
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keyswitchManipulator->selectMatrixManipulator(num);
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++keyForAnimationPath;
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}
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}
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viewer.setCameraManipulator( keyswitchManipulator.get() );
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}
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// add the state manipulator
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viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
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// add the stats handler
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viewer.addEventHandler(new osgViewer::StatsHandler);
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// add the record camera path handler
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viewer.addEventHandler(new osgViewer::RecordCameraPathHandler);
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// add the window size toggle handler
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viewer.addEventHandler(new osgViewer::WindowSizeHandler);
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// obtain the vertical scale
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float verticalScale = 1.0f;
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while(arguments.read("-v",verticalScale)) {}
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// obtain the sample ratio
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float sampleRatio = 1.0f;
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while(arguments.read("-r",sampleRatio)) {}
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osgTerrain::TerrainTile::BlendingPolicy blendingPolicy = osgTerrain::TerrainTile::INHERIT;
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std::string strBlendingPolicy;
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while(arguments.read("--blending-policy", strBlendingPolicy))
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{
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if (strBlendingPolicy == "INHERIT") blendingPolicy = osgTerrain::TerrainTile::INHERIT;
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else if (strBlendingPolicy == "DO_NOT_SET_BLENDING") blendingPolicy = osgTerrain::TerrainTile::DO_NOT_SET_BLENDING;
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else if (strBlendingPolicy == "ENABLE_BLENDING") blendingPolicy = osgTerrain::TerrainTile::ENABLE_BLENDING;
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else if (strBlendingPolicy == "ENABLE_BLENDING_WHEN_ALPHA_PRESENT") blendingPolicy = osgTerrain::TerrainTile::ENABLE_BLENDING_WHEN_ALPHA_PRESENT;
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}
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// load the nodes from the commandline arguments.
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osg::ref_ptr<osg::Node> rootnode = osgDB::readNodeFiles(arguments);
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if (!rootnode)
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{
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osg::notify(osg::NOTICE)<<"Warning: no valid data loaded, please specify a database on the command line."<<std::endl;
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return 1;
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}
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osg::ref_ptr<osgTerrain::Terrain> terrain = findTopMostNodeOfType<osgTerrain::Terrain>(rootnode.get());
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if (!terrain)
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{
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// no Terrain node present insert one above the loaded model.
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terrain = new osgTerrain::Terrain;
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// if CoordinateSystemNode is present copy it's contents into the Terrain, and discard it.
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osg::CoordinateSystemNode* csn = findTopMostNodeOfType<osg::CoordinateSystemNode>(rootnode.get());
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if (csn)
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{
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terrain->set(*csn);
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for(unsigned int i=0; i<csn->getNumChildren();++i)
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{
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terrain->addChild(csn->getChild(i));
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}
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}
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else
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{
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terrain->addChild(rootnode.get());
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}
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rootnode = terrain.get();
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}
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terrain->setSampleRatio(sampleRatio);
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terrain->setVerticalScale(verticalScale);
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terrain->setBlendingPolicy(blendingPolicy);
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// register our custom handler for adjust Terrain settings
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viewer.addEventHandler(new TerrainHandler(terrain.get()));
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// add a viewport to the viewer and attach the scene graph.
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viewer.setSceneData( rootnode.get() );
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// run the viewers main loop
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return viewer.run();
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}
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