293 lines
8.7 KiB
C++
293 lines
8.7 KiB
C++
// -*-c++-*-
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/*
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* This application is open source and may be redistributed and/or modified
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* freely and without restriction, both in commericial and non commericial
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* applications,as long as this copyright notice is maintained.
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*
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* This application is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <osgText/Text>
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#include <osg/Geode>
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#include <osg/Group>
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#include <osg/Projection>
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#include <osg/Sequence>
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#include <osg/MatrixTransform>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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// create text drawable at 'pos'
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osg::Geode* createText(const std::string& str, const osg::Vec3& pos)
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{
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// text drawable
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osgText::Text* text = new osgText::Text;
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text->setFont(std::string("fonts/arial.ttf"));
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text->setPosition(pos);
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text->setText(str);
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// geode
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(text);
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return geode;
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}
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osg::Node* createTextGroup(const char** text)
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{
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osg::Group* group = new osg::Group;
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osg::Vec3 pos(120.0f, 800.0f, 0.0f);
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const osg::Vec3 delta(0.0f, -60.0f, 0.0f);
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// header
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const char** t = text;
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group->addChild(createText(*t++, pos));
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pos += delta;
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// remainder of text under sequence
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osg::Sequence* seq = new osg::Sequence;
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group->addChild(seq);
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while (*t) {
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seq->addChild(createText(*t++, pos));
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seq->setTime(seq->getNumChildren()-1, 2.0f);
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pos += delta;
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}
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// loop through all children
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seq->setInterval(osg::Sequence::LOOP, 0,-1);
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// real-time playback, repeat indefinitively
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seq->setDuration(1.0f, -1);
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// must be started explicitly
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seq->setMode(osg::Sequence::START);
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return group;
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}
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osg::Node* createHUD(osg::Node* node)
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{
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// absolute transform
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osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
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modelview_abs->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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modelview_abs->setMatrix(osg::Matrix::identity());
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modelview_abs->addChild(node);
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// 2D projection node
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osg::Projection* projection = new osg::Projection;
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projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
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projection->addChild(modelview_abs);
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// turn off lighting and depth test
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osg::StateSet* state = modelview_abs->getOrCreateStateSet();
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state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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state->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
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return projection;
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}
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osg::Node* createScaledNode(osg::Node* node, float targetScale)
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{
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// create scale matrix
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osg::MatrixTransform* transform = new osg::MatrixTransform;
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const osg::BoundingSphere& bsphere = node->getBound();
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float scale = targetScale / bsphere._radius;
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transform->setMatrix(osg::Matrix::scale(scale,scale,scale));
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transform->setDataVariance(osg::Object::STATIC);
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transform->addChild(node);
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// rescale normals
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osg::StateSet* state = transform->getOrCreateStateSet();
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state->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
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return transform;
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}
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osg::Sequence* createSequence(osg::ArgumentParser& arguments)
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{
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// assumes any remaining parameters are models
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osg::Sequence* seq = new osg::Sequence;
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for (int i = 1; i < arguments.argc(); ++i)
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{
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// load model
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osg::Node* node = osgDB::readNodeFile(arguments[i]);
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if (!node) {
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continue;
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}
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seq->addChild(createScaledNode(node, 100.0f));
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seq->setTime(seq->getNumChildren()-1, 1.0f);
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}
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// loop through all children
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seq->setInterval(osg::Sequence::LOOP, 0,-1);
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// real-time playback, repeat indefinitively
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seq->setDuration(1.0f, -1);
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return seq;
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}
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// event handler to control sequence
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class SequenceEventHandler : public osgGA::GUIEventHandler
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{
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public:
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SequenceEventHandler(osg::Sequence* seq)
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{
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_seq = seq;
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}
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// handle keydown events
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virtual bool handle(const osgGA::GUIEventAdapter& ea,
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osgGA::GUIActionAdapter&)
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{
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if (ea.getEventType() == osgGA::GUIEventAdapter::KEYDOWN) {
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switch (ea.getKey()) {
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case 'S':
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{
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osg::Sequence::SequenceMode mode = _seq->getMode();
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if (mode == osg::Sequence::STOP) {
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mode = osg::Sequence::START;
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std::cerr << "Start" << std::endl;
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}
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else if (mode == osg::Sequence::PAUSE) {
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mode = osg::Sequence::RESUME;
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std::cerr << "Resume" << std::endl;
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}
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else {
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mode = osg::Sequence::PAUSE;
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std::cerr << "Pause" << std::endl;
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}
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_seq->setMode(mode);
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}
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break;
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case 'L':
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{
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osg::Sequence::LoopMode mode;
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int begin, end;
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_seq->getInterval(mode, begin, end);
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if (mode == osg::Sequence::LOOP) {
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mode = osg::Sequence::SWING;
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std::cerr << "Swing" << std::endl;
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}
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else {
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mode = osg::Sequence::LOOP;
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std::cerr << "Loop" << std::endl;
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}
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_seq->setInterval(mode, begin, end);
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}
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break;
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default:
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break;
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}
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}
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return false;
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}
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// accept visits
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virtual void accept(osgGA::GUIEventHandlerVisitor&) {}
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private:
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osg::ref_ptr<osg::Sequence> _seq;
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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()->setDescription(arguments.getApplicationName()+" is the example which demonstrates use of osg::Sequence.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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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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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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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 occured when parsing the program aguments.
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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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// root
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osg::Group* rootNode = new osg::Group;
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// create info display
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const char* text[] = {
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"osg::Sequence Mini-Howto",
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"- can be used for simple flip-book-style animation",
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"- is subclassed from osg::Switch",
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"- assigns a display duration to each child",
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"- can loop or swing through an interval of it's children",
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"- can repeat the interval a number of times or indefinitively",
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"- press 'Shift-S' to start/pause/resume",
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"- press 'Shift-L' to toggle loop/swing mode",
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NULL
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};
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rootNode->addChild(createHUD(createTextGroup(text)));
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// add sequence of models from command line
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osg::Sequence* seq = createSequence(arguments);
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rootNode->addChild(seq);
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// add model to viewer.
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viewer.setSceneData(rootNode);
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// add event handler to control sequence
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viewer.getEventHandlerList().push_front(new SequenceEventHandler(seq));
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// create the windows and run the threads.
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viewer.realize();
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete before exit.
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viewer.sync();
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return 0;
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}
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