321 lines
11 KiB
C++
321 lines
11 KiB
C++
/* OpenSceneGraph example, osgpick.
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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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/* osgpick sample
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* demonstrate use of osgUtil/PickVisitor for picking in a HUD or
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* in a 3d scene,
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*/
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#include <osgUtil/Optimizer>
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#include <osgDB/ReadFile>
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#include <osgViewer/Viewer>
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#include <osgViewer/CompositeViewer>
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#include <osgGA/TerrainManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgGA/AnimationPathManipulator>
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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 <osg/Material>
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#include <osg/Geode>
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#include <osg/BlendFunc>
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#include <osg/Depth>
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#include <osg/Projection>
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#include <osg/MatrixTransform>
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#include <osg/Camera>
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#include <osg/io_utils>
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#include <osgText/Text>
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#include <sstream>
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// class to handle events with a pick
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class PickHandler : public osgGA::GUIEventHandler {
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public:
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PickHandler(osgText::Text* updateText):
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_updateText(updateText) {}
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~PickHandler() {}
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bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa);
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virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea);
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void setLabel(const std::string& name)
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{
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if (_updateText.get()) _updateText->setText(name);
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}
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protected:
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osg::ref_ptr<osgText::Text> _updateText;
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};
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bool PickHandler::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::PUSH):
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{
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osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
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if (view) pick(view,ea);
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return false;
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}
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case(osgGA::GUIEventAdapter::KEYDOWN):
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{
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if (ea.getKey()=='c')
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{
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osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
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osg::ref_ptr<osgGA::GUIEventAdapter> event = new osgGA::GUIEventAdapter(ea);
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event->setX((ea.getXmin()+ea.getXmax())*0.5);
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event->setY((ea.getYmin()+ea.getYmax())*0.5);
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if (view) pick(view,*event);
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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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void PickHandler::pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea)
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{
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osgUtil::LineSegmentIntersector::Intersections intersections;
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std::string gdlist="";
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float x = ea.getX();
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float y = ea.getY();
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if (view->computeIntersections(x,y,intersections))
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{
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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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std::ostringstream os;
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if (!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty()))
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{
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// the geodes are identified by name.
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os<<"Object \""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
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}
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else if (hitr->drawable.valid())
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{
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os<<"Object \""<<hitr->drawable->className()<<"\""<<std::endl;
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}
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os<<" local coords vertex("<< hitr->getLocalIntersectPoint()<<")"<<" normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl;
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os<<" world coords vertex("<< hitr->getWorldIntersectPoint()<<")"<<" normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl;
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const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = hitr->indexList;
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for(unsigned int i=0;i<vil.size();++i)
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{
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os<<" vertex indices ["<<i<<"] = "<<vil[i]<<std::endl;
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}
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gdlist += os.str();
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}
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}
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setLabel(gdlist);
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}
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osg::Node* createHUD(osgText::Text* updateText)
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{
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// create the hud. derived from osgHud.cpp
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// adds a set of quads, each in a separate Geode - which can be picked individually
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// eg to be used as a menuing/help system!
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// Can pick texts too!
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osg::Camera* hudCamera = new osg::Camera;
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hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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hudCamera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
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hudCamera->setViewMatrix(osg::Matrix::identity());
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hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
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hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
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std::string timesFont("fonts/times.ttf");
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// turn lighting off for the text and disable depth test to ensure its always ontop.
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osg::Vec3 position(150.0f,800.0f,0.0f);
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osg::Vec3 delta(0.0f,-60.0f,0.0f);
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{
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osg::Geode* geode = new osg::Geode();
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
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geode->setName("simple");
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hudCamera->addChild(geode);
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setText("Picking in Head Up Displays is simple!");
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text->setPosition(position);
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position += delta;
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}
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for (int i=0; i<5; i++) {
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osg::Vec3 dy(0.0f,-30.0f,0.0f);
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osg::Vec3 dx(120.0f,0.0f,0.0f);
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osg::Geode* geode = new osg::Geode();
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"};
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osg::Geometry *quad=new osg::Geometry;
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
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std::string name="subOption";
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name += " ";
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name += std::string(opts[i]);
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geode->setName(name);
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osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad
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osg::Vec4Array* colors = new osg::Vec4Array;
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colors = new osg::Vec4Array;
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colors->push_back(osg::Vec4(0.8-0.1*i,0.1*i,0.2*i, 1.0));
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quad->setColorArray(colors);
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quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
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(*vertices)[0]=position;
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(*vertices)[1]=position+dx;
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(*vertices)[2]=position+dx+dy;
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(*vertices)[3]=position+dy;
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quad->setVertexArray(vertices);
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quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
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geode->addDrawable(quad);
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hudCamera->addChild(geode);
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position += delta;
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}
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{ // this displays what has been selected
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osg::Geode* geode = new osg::Geode();
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
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geode->setName("The text label");
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geode->addDrawable( updateText );
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hudCamera->addChild(geode);
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updateText->setCharacterSize(20.0f);
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updateText->setFont(timesFont);
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updateText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
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updateText->setText("");
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updateText->setPosition(position);
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updateText->setDataVariance(osg::Object::DYNAMIC);
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position += delta;
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}
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return hudCamera;
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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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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
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// if not loaded assume no arguments passed in, try use default mode instead.
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if (!scene) scene = osgDB::readNodeFile("fountain.osg");
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osg::ref_ptr<osg::Group> group = dynamic_cast<osg::Group*>(scene.get());
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if (!group)
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{
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group = new osg::Group;
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group->addChild(scene.get());
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}
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osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
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// add the HUD subgraph.
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group->addChild(createHUD(updateText.get()));
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if (arguments.read("--CompositeViewer"))
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{
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osg::ref_ptr<osgViewer::View> view = new osgViewer::View;
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// add the handler for doing the picking
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view->addEventHandler(new PickHandler(updateText.get()));
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// set the scene to render
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view->setSceneData(group.get());
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view->setUpViewAcrossAllScreens();
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osgViewer::CompositeViewer viewer;
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viewer.addView(view.get());
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return viewer.run();
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}
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else
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{
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osgViewer::Viewer viewer;
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// add all 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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unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
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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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num = keyswitchManipulator->getNumMatrixManipulators();
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keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
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++keyForAnimationPath;
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}
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}
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keyswitchManipulator->selectMatrixManipulator(num);
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viewer.setCameraManipulator( keyswitchManipulator.get() );
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}
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// add the handler for doing the picking
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viewer.addEventHandler(new PickHandler(updateText.get()));
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// set the scene to render
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viewer.setSceneData(group.get());
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return viewer.run();
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}
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}
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