mirror of https://github.com/CGAL/cgal
147 lines
3.1 KiB
C++
147 lines
3.1 KiB
C++
#ifndef CGAL_QT_NEAREST_NEIGHBOR_H
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#define CGAL_QT_NEAREST_NEIGHBOR_H
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#include <vector>
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsScene>
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#include <QGraphicsEllipseItem>
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#include <QEvent>
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#include <QPen>
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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
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#include <CGAL/Qt/GraphicsViewInput.h>
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#include <CGAL/Qt/PointsGraphicsItem.h>
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namespace CGAL {
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namespace Qt {
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template <typename T>
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class NearestNeighbor : public GraphicsViewInput
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{
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typedef typename T::Point_d Point_2;
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public:
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NearestNeighbor(QGraphicsScene* s, typename T::Tree * t_, QObject* parent, int N);
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~NearestNeighbor();
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void setPen(const QPen& pen);
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void show();
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void hide();
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void setN(int n)
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{
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N = n;
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}
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protected:
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virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
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bool eventFilter(QObject *obj, QEvent *event);
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private:
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int N;
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typename T::Tree * t;
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QGraphicsScene *scene_;
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QGraphicsEllipseItem* circle;
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std::vector<Point_2> points;
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CGAL::Qt::PointsGraphicsItem<std::vector<Point_2> > * pgi;
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};
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template <typename T>
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NearestNeighbor<T>::NearestNeighbor(QGraphicsScene* s,
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typename T::Tree * t,
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QObject* parent,
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int N)
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: GraphicsViewInput(parent), N(N), t(t), scene_(s)
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{
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pgi = new PointsGraphicsItem<std::vector<Point_2> >(&points);
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pgi->setVerticesPen(QPen(::Qt::red, 3, ::Qt::SolidLine, ::Qt::RoundCap, ::Qt::RoundJoin));
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pgi->setZValue(10);
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scene_->addItem(pgi);
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circle = new QGraphicsEllipseItem();
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circle->hide();
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scene_->addItem(circle);
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}
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template <typename T>
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NearestNeighbor<T>::~NearestNeighbor()
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{
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}
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template <typename T>
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void
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NearestNeighbor<T>::setPen(const QPen& pen)
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{
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circle->setPen(pen);
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}
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template <typename T>
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void
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NearestNeighbor<T>::show()
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{
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circle->show();
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}
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template <typename T>
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void
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NearestNeighbor<T>::hide()
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{
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circle->hide();
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}
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template <typename T>
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void
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NearestNeighbor<T>::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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if(t->empty()){
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points.clear();
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circle->hide();
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return;
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}
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Point_2 query(event->scenePos().x(), event->scenePos().y());
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T search(*t, query, N);
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points.clear();
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double sr = 0;
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for(typename T::iterator it = search.begin(); it != search.end(); ++it){
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if(sr < it->second){
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points.push_back(it->first);
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sr = it->second;
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}
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}
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pgi->modelChanged();
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typename CGAL::Kernel_traits<Point_2>::Kernel::Circle_2 c(query, sr);
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CGAL::Bbox_2 bb = c.bbox();
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circle->setRect(bb.xmin(), bb.ymin(), bb.xmax()-bb.xmin(), bb.ymax()-bb.ymin());
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circle->show();
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}
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template <typename T>
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bool
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NearestNeighbor<T>::eventFilter(QObject *obj, QEvent *event)
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{
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if (event->type() == QEvent::GraphicsSceneMouseMove) {
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QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
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mouseMoveEvent(mouseEvent);
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return false; // don't consume the event
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} else{
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// standard event processing
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return QObject::eventFilter(obj, event);
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}
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}
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} // namespace Qt
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} // namespace CGAL
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#endif // CGAL_QT_NEAREST_NEIGHBOR_H
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