Hi, all,
I noticed in osgpick.cpp that osgText::Text and osg::Geometry could be
picked, but when I add an osg::Geode with osg::ShapeDrawable into the HUD
camera, the picking does not work anymore.
I list the code as follows. It will be appreciated if anyone can point out
where the problem is or provide the correct way. Thanks in advance.
// g++ osgpick.cpp -Wall -O3 -W -I/usr/include -losgDB -losgGA
-losgViewer -losg -losgUtil -losgText -lOpenThreads -losgWidget -o
osgpick.out
#include <osgViewer/Viewer>
#include <osg/Geode>
#include <osg/MatrixTransform>
#include <osg/Camera>
#include <osg/io_utils>
#include <osg/ShapeDrawable>
#include <osgText/Text>
#include <sstream>
// class to handle events with a pick
class PickHandler : public osgGA::GUIEventHandler {
public:
PickHandler(osgText::Text* updateText):
_updateText(updateText) {}
~PickHandler() {}
bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&
aa);
virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter&
ea);
void setLabel(const std::string& name)
{
if (_updateText.get()) _updateText->setText(name);
}
protected:
osg::ref_ptr<osgText::Text> _updateText;
};
bool PickHandler::handle(const osgGA::GUIEventAdapter&
ea,osgGA::GUIActionAdapter& aa)
{
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::PUSH):
{
osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
if (view) pick(view,ea);
return false;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='c')
{
osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
osg::ref_ptr<osgGA::GUIEventAdapter> event = new
osgGA::GUIEventAdapter(ea);
event->setX((ea.getXmin()+ea.getXmax())*0.5);
event->setY((ea.getYmin()+ea.getYmax())*0.5);
if (view) pick(view,*event);
}
return false;
}
default:
return false;
}
}
void PickHandler::pick(osgViewer::View* view, const osgGA::GUIEventAdapter&
ea)
{
osgUtil::LineSegmentIntersector::Intersections intersections;
std::string gdlist="";
if (view->computeIntersections(ea,intersections))
{
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin();
hitr != intersections.end();
++hitr)
{
std::ostringstream os;
if (!hitr->nodePath.empty() &&
!(hitr->nodePath.back()->getName().empty()))
{
// the geodes are identified by name.
os<<"Object
\""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
}
else if (hitr->drawable.valid())
{
os<<"Object
\""<<hitr->drawable->className()<<"\""<<std::endl;
}
os<<" local coords vertex("<<
hitr->getLocalIntersectPoint()<<")"<<"
normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl;
os<<" world coords vertex("<<
hitr->getWorldIntersectPoint()<<")"<<"
normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl;
const osgUtil::LineSegmentIntersector::Intersection::IndexList&
vil = hitr->indexList;
for(unsigned int i=0;i<vil.size();++i)
{
os<<" vertex indices ["<<i<<"] =
"<<vil[i]<<std::endl;
}
gdlist += os.str();
}
}
setLabel(gdlist);
}
osg::Camera* createHUD(osgText::Text* updateText)
{
osg::Camera* hudCamera = new osg::Camera;
hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
hudCamera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
hudCamera->setViewMatrix(osg::Matrix::identity());
hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
std::string timesFont("fonts/times.ttf");
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");
hudCamera->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, osg::Array::BIND_OVERALL);
(*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);
hudCamera->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("The text label");
geode->addDrawable( updateText );
hudCamera->addChild(geode);
updateText->setCharacterSize(20.0f);
updateText->setFont(timesFont);
updateText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
updateText->setText("");
updateText->setPosition(position);
updateText->setDataVariance(osg::Object::DYNAMIC);
position += delta;
}
return hudCamera;
}
osg::Node* createScene() {
osg::ref_ptr<osg::Geode> node = new osg::Geode;
osg::ref_ptr<osg::ShapeDrawable> sphere = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(500,300,0), 100));
node->addDrawable(sphere.get());
return node.release();
}
int main( int argc, char **argv )
{
osg::ref_ptr<osg::Node> scene = createScene();
osg::ref_ptr<osg::Group> group = new osg::Group;
osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
osg::ref_ptr<osg::Camera> hud = createHUD(updateText.get());
hud->addChild(scene.get());
//group->addChild(scene.get());
group->addChild(hud.get());
osgViewer::Viewer viewer;
viewer.addEventHandler(new PickHandler(updateText.get()));
viewer.setSceneData(group.get());
return viewer.run();
}
--
Martin
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