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// Copyright (c) 2008 GeometryFactory Sarl (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/GraphicsView/include/CGAL/Qt/PointsInKdTreeGraphicsItem.h $
// $Id: include/CGAL/Qt/PointsInKdTreeGraphicsItem.h 08b27d3db14 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Andreas Fabri <Andreas.Fabri@geometryfactory.com>
// Laurent Rineau <Laurent.Rineau@geometryfactory.com>
#ifndef CGAL_QT_POINTS_IN_KD_TREE_GRAPHICS_ITEM_H
#define CGAL_QT_POINTS_IN_KD_TREE_GRAPHICS_ITEM_H
#include <CGAL/license/GraphicsView.h>
#include <CGAL/Bbox_2.h>
#include <CGAL/bounding_box.h>
#include <CGAL/Qt/PainterOstream.h>
#include <CGAL/Qt/GraphicsItem.h>
#include <CGAL/Qt/Converter.h>
#include <CGAL/Fuzzy_iso_box.h>
#include <CGAL/iterator.h>
#include <QGraphicsScene>
#include <QPainter>
#include <QStyleOption>
namespace CGAL {
namespace Qt {
template <typename KdTree>
class PointsInKdTreeGraphicsItem : public GraphicsItem
{
typedef typename std::iterator_traits<typename KdTree::iterator>::value_type Point_2;
typedef typename CGAL::Kernel_traits<Point_2>::Kernel Traits;
typedef typename Traits::Iso_rectangle_2 Iso_rectangle_2;
typedef CGAL::Fuzzy_iso_box<typename KdTree::Traits> Fuzzy_iso_box;
// Instead of first collecting points into a container, and then draw them
// we use an output iterator that draws them on the fly
template <typename K>
class Draw
: public CGAL::cpp98::iterator<std::output_iterator_tag, void, void, void, void> {
QPainter* painter;
QTransform* matrix;
Converter<K> convert;
public:
Draw(QPainter* painter, QTransform* matrix)
: painter(painter), matrix(matrix)
{}
Draw& operator=(const Point_2& p)
{
QPointF point = matrix->map(convert(p));
painter->drawPoint(point);
return *this;
}
Draw& operator++()
{
return *this;
}
Draw& operator*()
{
return *this;
}
Draw& operator++(int)
{
return *this;
}
};
public:
PointsInKdTreeGraphicsItem(KdTree* p_);
void modelChanged();
public:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
const QPen& verticesPen() const
{
return vertices_pen;
}
void setVerticesPen(const QPen& pen)
{
vertices_pen = pen;
}
protected:
void updateBoundingBox();
KdTree * kdtree;
QPainter* m_painter;
PainterOstream<Traits> painterostream;
Converter<Traits> convert;
QRectF bounding_rect;
QPen vertices_pen;
bool draw_vertices;
};
template <typename KdTree>
PointsInKdTreeGraphicsItem<KdTree>::PointsInKdTreeGraphicsItem(KdTree * p_)
: kdtree(p_), painterostream(0), draw_vertices(true)
{
setVerticesPen(QPen(::Qt::red, 3.));
if(kdtree->size() == 0){
this->hide();
}
updateBoundingBox();
setZValue(3);
setFlag(QGraphicsItem::ItemUsesExtendedStyleOption, true);
}
template <typename KdTree>
QRectF
PointsInKdTreeGraphicsItem<KdTree>::boundingRect() const
{
return bounding_rect;
}
template <typename KdTree>
void
PointsInKdTreeGraphicsItem<KdTree>::paint(QPainter *painter,
const QStyleOptionGraphicsItem *option,
QWidget * /*widget*/)
{
Iso_rectangle_2 isor = convert(option->exposedRect);
Fuzzy_iso_box range(isor.vertex(0), isor.vertex(2));
painter->setPen(verticesPen());
QTransform matrix = painter->worldTransform();
painter->resetTransform();
Draw<Traits> draw(painter, &matrix);
kdtree->search(draw, range);
}
// We let the bounding box only grow, so that when vertices get removed
// the maximal bbox gets refreshed in the GraphicsView
template <typename KdTree>
void
PointsInKdTreeGraphicsItem<KdTree>::updateBoundingBox()
{
prepareGeometryChange();
if(kdtree->size() == 0){
return;
}
bounding_rect = convert(CGAL::bounding_box(kdtree->begin(), kdtree->end()));
}
template <typename KdTree>
void
PointsInKdTreeGraphicsItem<KdTree>::modelChanged()
{
if((kdtree->size() == 0) ){
this->hide();
} else if((kdtree->size() > 0) && (! this->isVisible())){
this->show();
}
updateBoundingBox();
update();
}
} // namespace Qt
} // namespace CGAL
#endif // CGAL_QT_POINTS_IN_KD_TREE_GRAPHICS_ITEM_H
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