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osg点选框选对象

2020-02-24 13:06:32 作者：互联网

//点选 event事件虚函数调用的点选

void PointSelect( osgViewer::Viewer* viewer, const osgGA::GUIEventAdapter& ea )
{
   osgGroupPtr root = dynamic_cast<osg::Group*>(viewer->getSceneData());
   if (root.get() == NULL)
       return;
   //选中的对象
   osgNodePtr node;
   osgGroupPtr parent;
   //创建一个线段交集检测函数
   osgUtil::LineSegmentIntersector::Intersections intersections;
   if (viewer->computeIntersections(ea,intersections))
   {
       const osgUtil::LineSegmentIntersector::Intersection& hit =
           *intersections.begin();
       const osg::NodePath& nodePath = hit.nodePath;

       //得到选中对象
       node = (nodePath.size() >= 1) ? nodePath[nodePath.size()-1] : 0;
       parent = (nodePath.size() >= 2) ? dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]) : 0;

       if (picktype == PickGeometry)
       {
           //选择Drawable
           if (node.get() && hit.drawable.get())
           {
               parent = dynamic_cast<osg::Group*>(node.get());
               node = hit.drawable;
           }
       }
   }

}

//测标点框选 ex,ey为屏幕坐标
bool RectSearch( float ex, float ey ,osgViewer::Viewer* pViewer)
{
   double mx = ex;
   double my = ey;
   double w = max(dExpendX,1.0f);

   double h = max(dExpendY,1.0f);

   osgUtil::PolytopeIntersector* picker =
   new osgUtil::PolytopeIntersector( osgUtil::Intersector::WINDOW, mx-w, my-h, mx+w, my+h );

   osgUtil::IntersectionVisitor iv(picker);

pViewer->getCamera()->accept(iv);

   if (picker->containsIntersections())

   {

       osgUtil::PolytopeIntersector::Intersections sections = picker->getIntersections();
       std::set<osgUtil::PolytopeIntersector::Intersection>::iterator it = sections.begin();
       for (it; it != sections.end(); it++)
       {
           osgUtil::PolytopeIntersector::Intersection& hit = *it;
           //得到选中对象
           node = (nodePath.size() >= 1) ? nodePath[nodePath.size()-1] : 0;
           parent = (nodePath.size() >= 2) ? dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]) : 0;
           //如果需要选择Drawable
           {
               if (node.get() && hit.drawable.get())
               {
                   parent = dynamic_cast<osg::Group*>(node.get());
                   node = hit.drawable;
               }
           }
       }
   }
   if (vFeature.empty())
       return false;
   return true;
}

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标签：点选,node,hit,nodePath,get,osgUtil,框选,osg,size
来源： https://blog.csdn.net/snowwind_51/article/details/104475380

osg点选 框选对象

osg点选框选对象