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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/PolylinesGraphicsItem.h $
// $Id: include/CGAL/Qt/PolylinesGraphicsItem.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_POLYLINES_GRAPHICS_ITEM_H
#define CGAL_QT_POLYLINES_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 <QGraphicsScene>
#include <QPainter>
#include <QStyleOption>
namespace CGAL {
namespace Qt {
template <typename P>
class PolylinesGraphicsItem : public GraphicsItem
{
typedef typename P::value_type Polyline;
typedef typename Polyline::value_type Point_2;
typedef typename CGAL::Kernel_traits<Point_2>::Kernel Traits;
typedef typename Traits::Segment_2 Segment_2;
public:
PolylinesGraphicsItem(P* 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;
}
bool drawVertices() const
{
return draw_vertices;
}
void setDrawVertices(const bool b)
{
draw_vertices = b;
update();
}
const QPen& edgesPen() const
{
return edges_pen;
}
void setEdgesPen(const QPen& pen)
{
edges_pen = pen;
}
protected:
void updateBoundingBox();
P * polylines;
QPainter* m_painter;
PainterOstream<Traits> painterostream;
QRectF bounding_rect;
QPen vertices_pen;
QPen edges_pen;
bool draw_edges;
bool draw_vertices;
};
template <typename P>
PolylinesGraphicsItem<P>::PolylinesGraphicsItem(P * p_)
: polylines(p_), painterostream(0),
draw_edges(true), draw_vertices(true)
{
setVerticesPen(QPen(::Qt::red, 3.));
updateBoundingBox();
setZValue(3);
}
template <typename P>
QRectF
PolylinesGraphicsItem<P>::boundingRect() const
{
return bounding_rect;
}
template <typename P>
void
PolylinesGraphicsItem<P>::paint(QPainter *painter,
const QStyleOptionGraphicsItem * /*option*/,
QWidget * /*widget*/)
{
painterostream = PainterOstream<Traits>(painter);
painter->setPen(this->edgesPen());
for(typename P::iterator it = polylines->begin();
it != polylines->end();
it++){
Polyline & pl = *it;
typename Polyline::iterator pit = pl.begin();
Point_2 p = *pit;
++pit;
for(; pit != pl.end(); ++pit){
const Point_2 &q = *pit;
painterostream << Segment_2(p, q);
p = q;
}
}
}
// We let the bounding box only grow, so that when vertices get removed
// the maximal bbox gets refreshed in the GraphicsView
template <typename P>
void
PolylinesGraphicsItem<P>::updateBoundingBox()
{
Converter<Traits> convert;
prepareGeometryChange();
if(polylines->size() == 0){
return;
}
Bbox_2 bb = CGAL::bounding_box(polylines->begin()->begin(), polylines->begin()->end()).bbox();
for(typename P::iterator it = polylines->begin();
it != polylines->end();
++it){
bb = bb + CGAL::bounding_box(it->begin(), it->end()).bbox();;
}
bounding_rect = convert(bb);
}
template <typename P>
void
PolylinesGraphicsItem<P>::modelChanged()
{
updateBoundingBox();
update();
}
} // namespace Qt
} // namespace CGAL
#endif // CGAL_QT_POLYLINES_GRAPHICS_ITEM_H
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