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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/RegularGridVectorFieldGraphicsItem.h $
// $Id: include/CGAL/Qt/RegularGridVectorFieldGraphicsItem.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_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H
#define CGAL_QT_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H
#include <CGAL/license/GraphicsView.h>
#include <CGAL/Bbox_2.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 T, typename K>
class RegularGridVectorFieldGraphicsItem : public GraphicsItem
{
typedef typename T::Geom_traits Geom_traits;
typedef typename K::Point_2 Point_2;
typedef typename K::Vector_2 Vector_2;
typedef typename K::Segment_2 Segment_2;
public:
RegularGridVectorFieldGraphicsItem(T* t_);
void modelChanged();
public:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
const QPen& verticesPen() const
{
return vertices_pen;
}
const QPen& edgesPen() const
{
return edges_pen;
}
void setVerticesPen(const QPen& pen)
{
vertices_pen = pen;
}
void setEdgesPen(const QPen& pen)
{
edges_pen = pen;
}
bool visibleVertices() const
{
return visible_vertices;
}
void setVisibleVertices(const bool b)
{
visible_vertices = b;
update();
}
bool visibleEdges() const
{
return visible_edges;
}
void setVisibleEdges(const bool b)
{
visible_edges = b;
update();
}
protected:
void updateBoundingBox();
T * rg;
QPainter* m_painter;
PainterOstream<Geom_traits> painterostream;
QRectF bounding_rect;
QPen vertices_pen;
QPen edges_pen;
bool visible_edges;
bool visible_vertices;
};
template <typename T, typename K>
RegularGridVectorFieldGraphicsItem<T,K>::RegularGridVectorFieldGraphicsItem(T * t_)
: rg(t_), painterostream(0),
visible_edges(true), visible_vertices(true)
{
setVerticesPen(QPen(::Qt::red, 3.));
updateBoundingBox();
setZValue(3);
}
template <typename T, typename K>
QRectF
RegularGridVectorFieldGraphicsItem<T,K>::boundingRect() const
{
return bounding_rect;
}
template <typename T, typename K>
void
RegularGridVectorFieldGraphicsItem<T,K>::paint(QPainter *painter,
const QStyleOptionGraphicsItem * /*option*/,
QWidget * /*widget*/)
{
painterostream = PainterOstream<Geom_traits>(painter);
painter->setPen(this->edgesPen());
double w = rg->get_size().first;
double h = rg->get_size().second;
int nw = rg->get_dimension().first;
int nh = rg->get_dimension().second;
double dw = w/(nw-1);
double dh = h/(nh-1);
for(int i = 0; i < nw; i++){
for(int j = 0; j < nh; j++){
Vector_2 v = rg->get_field(i,j);
v = (dw*0.45) * v/sqrt(v*v);
painterostream << Segment_2(Point_2(i*dw,j*dh),
Point_2(i*dw,j*dw)+v);
}
}
painter->setPen(this->verticesPen());
QTransform matrix = painter->worldTransform();
painter->resetTransform();
for(int i = 0; i < nw; i++){
for(int j = 0; j < nh; j++){
painter->drawPoint(matrix.map(QPointF(i*dw, j*dh)));
}
}
}
// We let the bounding box only grow, so that when vertices get removed
// the maximal bbox gets refreshed in the GraphicsView
template <typename T, typename K>
void
RegularGridVectorFieldGraphicsItem<T,K>::updateBoundingBox()
{
bounding_rect = QRectF(0,
0,
rg->get_size().first,
rg->get_size().second);
}
template <typename T, typename K>
void
RegularGridVectorFieldGraphicsItem<T,K>::modelChanged()
{
update();
}
} // namespace Qt
} // namespace CGAL
#endif // CGAL_QT_REGULAR_GRID_VECTOR_FIELD_GRAPHICS_ITEM_H
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