294 lines
9.5 KiB
C++
294 lines
9.5 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
/* osgpick sample
|
|
* demonstrate use of osgUtil/PickVisitor for picking in a HUD or
|
|
* in a 3d scene,
|
|
*/
|
|
|
|
#include <osgUtil/Optimizer>
|
|
#include <osgDB/ReadFile>
|
|
#include <osgProducer/Viewer>
|
|
|
|
#include <osg/Material>
|
|
#include <osg/Geode>
|
|
#include <osg/BlendFunc>
|
|
#include <osg/Depth>
|
|
#include <osg/Projection>
|
|
#include <osg/MatrixTransform>
|
|
|
|
#include <osgText/Text>
|
|
|
|
#include <osgUtil/PickVisitor>
|
|
|
|
|
|
|
|
// class to handle events with a pick
|
|
class PickHandler : public osgGA::GUIEventHandler {
|
|
public:
|
|
|
|
PickHandler(osgProducer::OsgCameraGroup* cg,osgText::Text* updateText):
|
|
_cg(cg),
|
|
_updateText(updateText) {}
|
|
|
|
~PickHandler() {}
|
|
|
|
bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& us);
|
|
|
|
virtual void pick(const osgGA::GUIEventAdapter& ea);
|
|
|
|
void setLabel(const std::string& name)
|
|
{
|
|
if (_updateText.get()) _updateText->setText(name);
|
|
}
|
|
|
|
protected:
|
|
|
|
osgProducer::OsgCameraGroup *_cg;
|
|
osg::ref_ptr<osgText::Text> _updateText;
|
|
};
|
|
|
|
bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
|
|
{
|
|
switch(ea.getEventType())
|
|
{
|
|
case(osgGA::GUIEventAdapter::FRAME):
|
|
{
|
|
pick(ea);
|
|
}
|
|
return false;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void PickHandler::pick(const osgGA::GUIEventAdapter& ea)
|
|
{
|
|
// OK here is the interesting bit - How To Pick a Geode
|
|
// including geodes in a HUD under a Projection Matrix
|
|
osg::Node *scene=_cg->getSceneData();//main node of the scene.
|
|
if (scene)
|
|
{
|
|
float x=ea.getXnormalized();
|
|
float y=ea.getYnormalized();
|
|
|
|
Producer::Camera *cmm=_cg->getCamera(0);
|
|
osg::Matrix vum(osg::Matrix(cmm->getViewMatrix()) *
|
|
osg::Matrix(cmm->getProjectionMatrix())/* *
|
|
osg::Matrix::translate(1.0f,1.0f,1.0f) *
|
|
osg::Matrix::scale(0.5f,0.5f,0.5f)*/);
|
|
|
|
osgUtil::PickVisitor iv;
|
|
osgUtil::IntersectVisitor::HitList& hlist=iv.getHits(scene, vum, x,y);
|
|
std::string gdlist="";
|
|
if (iv.hits())
|
|
{
|
|
for(osgUtil::IntersectVisitor::HitList::iterator hitr=hlist.begin();
|
|
hitr!=hlist.end();
|
|
++hitr)
|
|
{
|
|
//osg::Vec3 ip = hitr->getLocalIntersectPoint();
|
|
//osg::Vec3 in = hitr->getLocalIntersectNormal();
|
|
osg::Geode* geode = hitr->_geode.get();
|
|
// the geodes are identified by name.
|
|
if (geode)
|
|
{
|
|
if (!geode->getName().empty())
|
|
{
|
|
gdlist=gdlist+" "+geode->getName();
|
|
}
|
|
else
|
|
{
|
|
gdlist=gdlist+" geode";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
setLabel(gdlist);
|
|
}
|
|
}
|
|
|
|
osg::Node* createHUD(osgText::Text* updateText)
|
|
{ // create the hud. derived from osgHud.cpp
|
|
// adds a set of quads, each in a separate Geode - which can be picked individually
|
|
// eg to be used as a menuing/help system!
|
|
// Can pick texts too!
|
|
osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
|
|
modelview_abs->setReferenceFrame(osg::Transform::RELATIVE_TO_ABSOLUTE);
|
|
modelview_abs->setMatrix(osg::Matrix::identity());
|
|
|
|
osg::Projection* projection = new osg::Projection;
|
|
projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
|
|
projection->addChild(modelview_abs);
|
|
|
|
|
|
std::string timesFont("fonts/times.ttf");
|
|
|
|
// turn lighting off for the text and disable depth test to ensure its always ontop.
|
|
osg::Vec3 position(150.0f,800.0f,0.0f);
|
|
osg::Vec3 delta(0.0f,-60.0f,0.0f);
|
|
|
|
{
|
|
osg::Geode* geode = new osg::Geode();
|
|
osg::StateSet* stateset = geode->getOrCreateStateSet();
|
|
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
|
|
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
|
|
geode->setName("simple");
|
|
modelview_abs->addChild(geode);
|
|
|
|
osgText::Text* text = new osgText::Text;
|
|
geode->addDrawable( text );
|
|
|
|
text->setFont(timesFont);
|
|
text->setText("Picking in Head Up Displays is simple !=]");
|
|
text->setPosition(position);
|
|
|
|
position += delta;
|
|
}
|
|
|
|
|
|
for (int i=0; i<5; i++) {
|
|
osg::Vec3 dy(0.0f,-30.0f,0.0f);
|
|
osg::Vec3 dx(120.0f,0.0f,0.0f);
|
|
osg::Geode* geode = new osg::Geode();
|
|
osg::StateSet* stateset = geode->getOrCreateStateSet();
|
|
const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"};
|
|
osg::Geometry *quad=new osg::Geometry;
|
|
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
|
|
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
|
|
std::string name="subOption";
|
|
name += " ";
|
|
name += std::string(opts[i]);
|
|
geode->setName(name);
|
|
osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad
|
|
osg::Vec4Array* colors = new osg::Vec4Array;
|
|
colors = new osg::Vec4Array;
|
|
colors->push_back(osg::Vec4(0.8-0.1*i,0.1*i,0.2*i, 1.0));
|
|
quad->setColorArray(colors);
|
|
quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
|
|
(*vertices)[0]=position;
|
|
(*vertices)[1]=position+dx;
|
|
(*vertices)[2]=position+dx+dy;
|
|
(*vertices)[3]=position+dy;
|
|
quad->setVertexArray(vertices);
|
|
quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
|
|
geode->addDrawable(quad);
|
|
modelview_abs->addChild(geode);
|
|
|
|
position += delta;
|
|
}
|
|
|
|
|
|
|
|
{ // this displays what has been selected
|
|
osg::Geode* geode = new osg::Geode();
|
|
osg::StateSet* stateset = geode->getOrCreateStateSet();
|
|
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
|
|
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
|
|
geode->setName("whatis");
|
|
geode->addDrawable( updateText );
|
|
modelview_abs->addChild(geode);
|
|
|
|
updateText->setFont(timesFont);
|
|
updateText->setText("whatis will tell you what is under the mouse");
|
|
updateText->setPosition(position);
|
|
|
|
position += delta;
|
|
}
|
|
|
|
return projection;
|
|
|
|
}
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
|
|
// use an ArgumentParser object to manage the program arguments.
|
|
osg::ArgumentParser arguments(&argc,argv);
|
|
|
|
// set up the usage document, in case we need to print out how to use this program.
|
|
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to do Head Up Displays.");
|
|
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] [filename] ...");
|
|
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
|
|
|
|
|
|
// construct the viewer.
|
|
osgProducer::Viewer viewer(arguments);
|
|
|
|
// set up the value with sensible default event handlers.
|
|
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
|
|
|
|
// get details on keyboard and mouse bindings used by the viewer.
|
|
viewer.getUsage(*arguments.getApplicationUsage());
|
|
|
|
// if user request help write it out to cout.
|
|
if (arguments.read("-h") || arguments.read("--help"))
|
|
{
|
|
arguments.getApplicationUsage()->write(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
// any option left unread are converted into errors to write out later.
|
|
arguments.reportRemainingOptionsAsUnrecognized();
|
|
|
|
// report any errors if they have occured when parsing the program aguments.
|
|
if (arguments.errors())
|
|
{
|
|
arguments.writeErrorMessages(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
// read the scene from the list of file specified commandline args.
|
|
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
|
|
|
|
osg::ref_ptr<osg::Group> group = dynamic_cast<osg::Group*>(scene.get());
|
|
if (!group)
|
|
{
|
|
group = new osg::Group;
|
|
group->addChild(scene.get());
|
|
}
|
|
|
|
osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
|
|
|
|
// add the HUD subgraph.
|
|
group->addChild(createHUD(updateText.get()));
|
|
|
|
// add the handler for doing the picking
|
|
viewer.getEventHandlerList().push_front(new PickHandler(&viewer,updateText.get()));
|
|
|
|
// set the scene to render
|
|
viewer.setSceneData(group.get());
|
|
|
|
// create the windows and run the threads.
|
|
viewer.realize();
|
|
|
|
while( !viewer.done() )
|
|
{
|
|
// wait for all cull and draw threads to complete.
|
|
viewer.sync();
|
|
|
|
// update the scene by traversing it with the the update visitor which will
|
|
// call all node update callbacks and animations.
|
|
viewer.update();
|
|
|
|
// fire off the cull and draw traversals of the scene.
|
|
viewer.frame();
|
|
|
|
}
|
|
|
|
// wait for all cull and draw threads to complete before exit.
|
|
viewer.sync();
|
|
|
|
return 0;
|
|
}
|