316 lines
11 KiB
C++
316 lines
11 KiB
C++
// --c++--
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#include <osgDB/ReadFile>
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#include <osgUtil/Optimizer>
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#include <osgViewer/Viewer>
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#include <osg/CoordinateSystemNode>
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#include <osgText/Text>
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#include <osgManipulator/CommandManager>
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#include <osgManipulator/TabBoxDragger>
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#include <osgManipulator/TabPlaneDragger>
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#include <osgManipulator/TabPlaneTrackballDragger>
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#include <osgManipulator/TrackballDragger>
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#include <osgManipulator/Translate1DDragger>
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#include <osgManipulator/Translate2DDragger>
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#include <osgManipulator/TranslateAxisDragger>
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#include <iostream>
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osgManipulator::Dragger* createDragger(const std::string& name)
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{
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osgManipulator::Dragger* dragger = 0;
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if ("TabPlaneDragger" == name)
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{
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osgManipulator::TabPlaneDragger* d = new osgManipulator::TabPlaneDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else if ("TabPlaneTrackballDragger" == name)
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{
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osgManipulator::TabPlaneTrackballDragger* d = new osgManipulator::TabPlaneTrackballDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else if ("TrackballDragger" == name)
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{
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osgManipulator::TrackballDragger* d = new osgManipulator::TrackballDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else if ("Translate1DDragger" == name)
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{
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osgManipulator::Translate1DDragger* d = new osgManipulator::Translate1DDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else if ("Translate2DDragger" == name)
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{
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osgManipulator::Translate2DDragger* d = new osgManipulator::Translate2DDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else if ("TranslateAxisDragger" == name)
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{
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osgManipulator::TranslateAxisDragger* d = new osgManipulator::TranslateAxisDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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else
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{
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osgManipulator::TabBoxDragger* d = new osgManipulator::TabBoxDragger();
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d->setupDefaultGeometry();
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dragger = d;
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}
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return dragger;
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}
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osg::Node* createHUD()
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{
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osg::Geode* geode = new osg::Geode();
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std::string timesFont("fonts/arial.ttf");
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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osg::Vec3 position(50.0f,50.0f,0.0f);
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text->setPosition(position);
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text->setText("Use the Tab key to switch between the trackball and pick modes.");
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text->setFont(timesFont);
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osg::Camera* camera = new osg::Camera;
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// set the projection matrix
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camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
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// set the view matrix
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camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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camera->setViewMatrix(osg::Matrix::identity());
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// only clear the depth buffer
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camera->setClearMask(GL_DEPTH_BUFFER_BIT);
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// draw subgraph after main camera view.
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camera->setRenderOrder(osg::Camera::POST_RENDER);
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camera->addChild(geode);
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return camera;
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}
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osg::Node* addDraggerToScene(osg::Node* scene, osgManipulator::CommandManager* cmdMgr, const std::string& name)
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{
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scene->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
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osgManipulator::Selection* selection = new osgManipulator::Selection;
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selection->addChild(scene);
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osgManipulator::Dragger* dragger = createDragger(name);
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osg::Group* root = new osg::Group;
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root->addChild(dragger);
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root->addChild(selection);
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root->addChild(createHUD());
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float scale = scene->getBound().radius() * 1.6;
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dragger->setMatrix(osg::Matrix::scale(scale, scale, scale) *
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osg::Matrix::translate(scene->getBound().center()));
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cmdMgr->connect(*dragger, *selection);
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return root;
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}
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class PickModeHandler : public osgGA::GUIEventHandler
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{
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public:
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enum Modes
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{
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VIEW = 0,
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PICK
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};
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PickModeHandler():
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_mode(VIEW),
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_activeDragger(0)
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{
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}
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bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa,
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osg::Object*, osg::NodeVisitor*)
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{
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osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
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if (!view) return false;
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if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Tab &&
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ea.getEventType() == osgGA::GUIEventAdapter::KEYDOWN &&
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_activeDragger == 0)
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{
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_mode = ! _mode;
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}
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if (VIEW == _mode) return false;
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switch (ea.getEventType())
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{
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case osgGA::GUIEventAdapter::PUSH:
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{
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osgUtil::LineSegmentIntersector::Intersections intersections;
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_pointer.reset();
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if (view->computeIntersections(ea.getX(),ea.getY(),intersections))
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{
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_pointer.setCamera(view->getCamera());
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_pointer.setMousePosition(ea.getX(), ea.getY());
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for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin();
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hitr != intersections.end();
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++hitr)
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{
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_pointer.addIntersection(hitr->nodePath, hitr->getLocalIntersectPoint());
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}
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for (osg::NodePath::iterator itr = _pointer._hitList.front().first.begin();
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itr != _pointer._hitList.front().first.end();
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++itr)
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{
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osgManipulator::Dragger* dragger = dynamic_cast<osgManipulator::Dragger*>(*itr);
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if (dragger)
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{
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dragger->handle(_pointer, ea, aa);
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_activeDragger = dragger;
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break;
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}
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}
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}
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}
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case osgGA::GUIEventAdapter::DRAG:
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case osgGA::GUIEventAdapter::RELEASE:
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{
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if (_activeDragger)
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{
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_pointer._hitIter = _pointer._hitList.begin();
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_pointer.setCamera(view->getCamera());
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_pointer.setMousePosition(ea.getX(), ea.getY());
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_activeDragger->handle(_pointer, ea, aa);
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}
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break;
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}
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default:
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break;
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}
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if (ea.getEventType() == osgGA::GUIEventAdapter::RELEASE)
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{
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_activeDragger = 0;
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_pointer.reset();
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}
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return true;
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}
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private:
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unsigned int _mode;
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osgManipulator::Dragger* _activeDragger;
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osgManipulator::PointerInfo _pointer;
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};
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
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arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
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arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
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arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
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arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
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arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");
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arguments.getApplicationUsage()->addCommandLineOption("--dragger <draggername>","Use the specified dragger for manipulation");
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// construct the viewer.
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osgViewer::Viewer viewer;
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// if user request help write it out to cout.
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bool helpAll = arguments.read("--help-all");
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unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
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((helpAll || arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
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((helpAll || arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
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if (helpType)
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{
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arguments.getApplicationUsage()->write(std::cout, helpType);
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return 1;
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}
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// report any errors if they have occurred when parsing the program arguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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if (arguments.argc()<=1)
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{
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arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
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return 1;
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}
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std::string dragger_name = "TabBoxDragger";
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arguments.read("--dragger", dragger_name);
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osg::Timer_t start_tick = osg::Timer::instance()->tick();
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// read the scene from the list of file specified command line args.
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
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// if no model has been successfully loaded report failure.
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if (!loadedModel)
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{
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std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
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return 1;
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}
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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occurred when parsing the program arguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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}
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osg::Timer_t end_tick = osg::Timer::instance()->tick();
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std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;
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// optimize the scene graph, remove redundant nodes and state etc.
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osgUtil::Optimizer optimizer;
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optimizer.optimize(loadedModel.get());
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osg::ref_ptr<osgManipulator::CommandManager> cmdMgr = new osgManipulator::CommandManager;
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// pass the loaded scene graph to the viewer.
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viewer.setSceneData(addDraggerToScene(loadedModel.get(), cmdMgr.get(), dragger_name));
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viewer.addEventHandler(new PickModeHandler());
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return viewer.run();
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}
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