#include?
#include?
#include?
#include?
#include?

#include?
#include?
#include?
#include?
#include?
#include?

#include?
#include?

#include?

class?PickingHandler?:?public?osgGA::GUIEventHandler?{
public:

????PickingHandler（）?{
????????m_xMouseCoordAtLastPress?=?-1;
????????m_yMouseCoordAtLastPress?=?-1;
????}

????//?EventHandler?interface
????virtual?bool?handle（const?osgGA::GUIEventAdapter&?ea?osgGA::GUIActionAdapter&?aa?osg::object*?osg::NodeVisitor*）?{
????????if?（ea.getEventType（）?==?osgGA::GUIEventAdapter::RELEASE?&&?ea.getButton（）?==?osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON）?{

????????????if?（m_xMouseCoordAtLastPress?!=?ea.getX（）?||?m_yMouseCoordAtLastPress?!=?ea.getY（））?{
????????????????return?false;
????????????}

????????????return?printDescriptionOfIntersectedDrawable（ea?aa）;


????????}?else?if?（ea.getEventType（）?==?osgGA::GUIEventAdapter::PUSH?&&?ea.getButton（）?==?osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON）?{
????????????m_xMouseCoordAtLastPress?=?ea.getX（）;
????????????m_yMouseCoordAtLastPress?=?ea.getY（）;
????????}

????????return?false;
????}

private:

????bool?printDescriptionOfIntersectedDrawable（const?osgGA::GUIEventAdapter&?ea?osgGA::GUIActionAdapter&?aa）?{

????????osgUtil::LineSegmentIntersector::Intersections?intersections;
#if?OSG_VERSION_GREATER_OR_EQUAL（332）

????????????if?（!aa.computeIntersections（ea?intersections））?{
????????????????return?false;
????????????}
#else
???????????return?false;
#endif


????????osgUtil::LineSegmentIntersector::Intersection?firstIntersection?=?*intersections.begin（）;

????????if?（firstIntersection.drawable?==?nullptr）?{
????????????return?false;
????????}

#if?OSG_VERSION_GREATER_OR_EQUAL（332）

????????if?（firstIntersection.drawable->getNumDescriptions（）?==?0）?{
????????????std::cout?<ription:“?<????????????return?true;
????????}

????????std::cout?<ription?of?intersected?drawable:“?<????????for?（const?std::string&?desc?:?firstIntersection.drawable->getDescriptions（））?{
????????????std::cout?<????????}
#else
????????std::cout?<getName（）<#endif
????????std::cout?<
????????return?true;
????}

????int?m_xMouseCoordAtLastPress;
????int?m_yMouseCoordAtLastPress;
};


int?main（int?argc?char?*argv[]）
{
????osg::setNotifyLevel（osg::WARN）;

????std::cout?<????osgDB::Registry::instance（）->getLibraryFilePathList（）.push_front（PLUGIN_BIN_DIR）;

????osgDB::Registry::instance（）->addFileExtensionAlias（“gml“?“citygml“）;

????if?（argc?????????std::cerr?<