//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;
}