403 lines
12 KiB
C++
403 lines
12 KiB
C++
// C++ source file - (C) 2003 Robert Osfield, released under the OSGPL.
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//
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// Simple example of use of osgViewer::GraphicsWindow + SimpleViewer
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// example that provides the user with control over view position with basic picking.
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#include <osg/Timer>
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#include <osg/io_utils>
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#include <osg/observer_ptr>
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#include <osgUtil/IntersectionVisitor>
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#include <osgUtil/PolytopeIntersector>
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#include <osgUtil/LineSegmentIntersector>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <osgGA/TrackballManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgViewer/SimpleViewer>
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#include <osgViewer/GraphicsWindow>
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#include <osgFX/Scribe>
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#include <iostream>
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class CreateModelToSaveVisitor : public osg::NodeVisitor
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{
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public:
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CreateModelToSaveVisitor():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
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{
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_group = new osg::Group;
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_addToModel = false;
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}
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virtual void apply(osg::Node& node)
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{
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osgFX::Scribe* scribe = dynamic_cast<osgFX::Scribe*>(&node);
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if (scribe)
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{
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for(unsigned int i=0; i<scribe->getNumChildren(); ++i)
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{
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_group->addChild(scribe->getChild(i));
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}
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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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osg::ref_ptr<osg::Group> _group;
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bool _addToModel;
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};
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class DeleteSelectedNodesVisitor : public osg::NodeVisitor
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{
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public:
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DeleteSelectedNodesVisitor():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
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{
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}
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virtual void apply(osg::Node& node)
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{
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osgFX::Scribe* scribe = dynamic_cast<osgFX::Scribe*>(&node);
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if (scribe)
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{
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_selectedNodes.push_back(scribe);
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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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void pruneSelectedNodes()
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{
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for(SelectedNodes::iterator itr = _selectedNodes.begin();
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itr != _selectedNodes.end();
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++itr)
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{
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osg::Node* node = itr->get();
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osg::Node::ParentList parents = node->getParents();
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for(osg::Node::ParentList::iterator pitr = parents.begin();
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pitr != parents.end();
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++pitr)
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{
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osg::Group* parent = *pitr;
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parent->removeChild(node);
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}
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}
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}
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typedef std::vector< osg::ref_ptr<osgFX::Scribe> > SelectedNodes;
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SelectedNodes _selectedNodes;
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};
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class ExitHandler : public osgGA::GUIEventHandler
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{
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public:
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ExitHandler():
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_done(false) {}
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bool done() const { return _done; }
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bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
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{
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYUP):
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{
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if (ea.getKey()==osgGA::GUIEventAdapter::KEY_Escape)
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{
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_done = true;
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}
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return false;
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}
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case(osgGA::GUIEventAdapter::CLOSE_WINDOW):
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case(osgGA::GUIEventAdapter::QUIT_APPLICATION):
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{
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_done = true;
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}
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default: break;
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}
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return false;
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}
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bool _done;
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};
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// class to handle events with a pick
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class PickHandler : public osgGA::GUIEventHandler
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{
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public:
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PickHandler():
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_mx(0.0),_my(0.0) {}
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~PickHandler() {}
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bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
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{
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osgViewer::SimpleViewer* viewer = dynamic_cast<osgViewer::SimpleViewer*>(&aa);
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if (!viewer) return false;
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYUP):
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{
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if (ea.getKey()=='s')
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{
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saveSelectedModel(viewer->getSceneData());
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}
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else if (ea.getKey()=='o')
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{
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osg::notify(osg::NOTICE)<<"Saved model to file 'saved_model.osg'"<<std::endl;
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osgDB::writeNodeFile(*(viewer->getSceneData()), "saved_model.osg");
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}
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else if (ea.getKey()==osgGA::GUIEventAdapter::KEY_Delete || ea.getKey()==osgGA::GUIEventAdapter::KEY_BackSpace)
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{
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osg::notify(osg::NOTICE)<<"Delete"<<std::endl;
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DeleteSelectedNodesVisitor dsnv;
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viewer->getSceneData()->accept(dsnv);
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dsnv.pruneSelectedNodes();
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}
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return false;
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}
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case(osgGA::GUIEventAdapter::PUSH):
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case(osgGA::GUIEventAdapter::MOVE):
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{
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_mx = ea.getX();
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_my = ea.getY();
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return false;
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}
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case(osgGA::GUIEventAdapter::RELEASE):
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{
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if (_mx == ea.getX() && _my == ea.getY())
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{
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// only do a pick if the mouse hasn't moved
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pick(ea,viewer);
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}
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return true;
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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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void pick(const osgGA::GUIEventAdapter& ea, osgViewer::SimpleViewer* viewer)
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{
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osg::Node* scene = viewer->getSceneData();
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if (!scene) return;
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osg::notify(osg::NOTICE)<<std::endl;
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osg::Node* node = 0;
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osg::Group* parent = 0;
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bool usePolytopePicking = false;
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if (usePolytopePicking)
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{
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#if 0
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// use window coordinates
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// remap the mouse x,y into viewport coordinates.
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osg::Viewport* viewport = viewer->getCamera()->getViewport();
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double mx = viewport->x() + (int)((double )viewport->width()*(ea.getXnormalized()*0.5+0.5));
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double my = viewport->y() + (int)((double )viewport->height()*(ea.getYnormalized()*0.5+0.5));
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// half width, height.
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double w = 5.0f;
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double h = 5.0f;
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osgUtil::PolytopeIntersector* picker = new osgUtil::PolytopeIntersector( osgUtil::Intersector::WINDOW, mx-w, my-h, mx+w, my+h );
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#else
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double mx = ea.getXnormalized();
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double my = ea.getYnormalized();
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double w = 0.05;
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double h = 0.05;
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osgUtil::PolytopeIntersector* picker = new osgUtil::PolytopeIntersector( osgUtil::Intersector::PROJECTION, mx-w, my-h, mx+w, my+h );
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#endif
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osgUtil::IntersectionVisitor iv(picker);
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viewer->getCamera()->accept(iv);
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if (picker->containsIntersections())
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{
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osgUtil::PolytopeIntersector::Intersection intersection = picker->getFirstIntersection();
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osg::NodePath& nodePath = intersection.nodePath;
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node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
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parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
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if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
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}
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}
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else
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{
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#if 0
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// use non dimensional coordinates - in projection/clip space
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osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector( osgUtil::Intersector::PROJECTION, ea.getXnormalized(),ea.getYnormalized() );
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#else
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// use window coordinates
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// remap the mouse x,y into viewport coordinates.
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osg::Viewport* viewport = viewer->getCamera()->getViewport();
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float mx = viewport->x() + (int)((float)viewport->width()*(ea.getXnormalized()*0.5f+0.5f));
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float my = viewport->y() + (int)((float)viewport->height()*(ea.getYnormalized()*0.5f+0.5f));
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osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector( osgUtil::Intersector::WINDOW, mx, my );
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#endif
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osgUtil::IntersectionVisitor iv(picker);
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viewer->getCamera()->accept(iv);
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if (picker->containsIntersections())
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{
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osgUtil::LineSegmentIntersector::Intersection intersection = picker->getFirstIntersection();
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osg::notify(osg::NOTICE)<<"Picked "<<intersection.localIntersectionPoint<<std::endl;
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osg::NodePath& nodePath = intersection.nodePath;
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node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
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parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
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if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
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}
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}
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// now we try to decorate the hit node by the osgFX::Scribe to show that its been "picked"
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if (parent && node)
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{
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std::cout<<" parent "<<parent->className()<<std::endl;
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osgFX::Scribe* parentAsScribe = dynamic_cast<osgFX::Scribe*>(parent);
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if (!parentAsScribe)
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{
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// node not already picked, so highlight it with an osgFX::Scribe
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osgFX::Scribe* scribe = new osgFX::Scribe();
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scribe->addChild(node);
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parent->replaceChild(node,scribe);
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}
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else
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{
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// node already picked so we want to remove scribe to unpick it.
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osg::Node::ParentList parentList = parentAsScribe->getParents();
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for(osg::Node::ParentList::iterator itr=parentList.begin();
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itr!=parentList.end();
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++itr)
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{
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(*itr)->replaceChild(parentAsScribe,node);
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}
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}
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}
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}
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void saveSelectedModel(osg::Node* scene)
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{
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if (!scene) return;
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CreateModelToSaveVisitor cmtsv;
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scene->accept(cmtsv);
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if (cmtsv._group->getNumChildren()>0)
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{
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std::cout<<"Writing selected compoents to 'selected_model.osg'"<<std::endl;
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osgDB::writeNodeFile(*cmtsv._group, "selected_model.osg");
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}
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}
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protected:
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float _mx,_my;
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};
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int main( int argc, char **argv )
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{
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if (argc<2)
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{
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std::cout << argv[0] <<": requires filename argument." << std::endl;
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return 1;
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}
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// load the scene.
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFile(argv[1]);
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if (!loadedModel)
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{
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std::cout << argv[0] <<": No data loaded." << std::endl;
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return 1;
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}
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// create the window to draw to.
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osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
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traits->x = 200;
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traits->y = 200;
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traits->width = 800;
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traits->height = 600;
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traits->windowDecoration = true;
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traits->doubleBuffer = true;
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traits->sharedContext = 0;
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osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
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osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
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if (!gw)
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{
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osg::notify(osg::NOTICE)<<"Error: unable to create graphics window."<<std::endl;
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return 1;
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}
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gw->realize();
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gw->makeCurrent();
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// create the view of the scene.
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osgViewer::SimpleViewer viewer;
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viewer.setSceneData(loadedModel.get());
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viewer.setEventQueue(gw->getEventQueue());
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viewer.getEventQueue()->windowResize(traits->x,traits->y,traits->width,traits->height);
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// create a tracball manipulator to move the camera around in response to keyboard/mouse events
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viewer.setCameraManipulator( new osgGA::TrackballManipulator );
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osg::ref_ptr<osgGA::StateSetManipulator> statesetManipulator = new osgGA::StateSetManipulator;
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statesetManipulator->setStateSet(viewer.getSceneView()->getGlobalStateSet());
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viewer.addEventHandler(statesetManipulator.get());
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// add the pick handler
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viewer.addEventHandler(new PickHandler());
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// add the exit handler'
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ExitHandler* exitHandler = new ExitHandler;
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viewer.addEventHandler(exitHandler);
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viewer.init();
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// main loop (note, window toolkits which take control over the main loop will require a window redraw callback containing the code below.)
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while( gw->isRealized() && !exitHandler->done())
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{
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gw->checkEvents();
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viewer.frame();
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// Swap Buffers
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gw->swapBuffers();
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}
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return 0;
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}
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