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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/GraphicsViewCircleInput.h $
// $Id: include/CGAL/Qt/GraphicsViewCircleInput.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_GRAPHICS_VIEW_CIRCLE_INPUT_H
#define CGAL_QT_GRAPHICS_VIEW_CIRCLE_INPUT_H
#include <CGAL/license/GraphicsView.h>
#include <QGraphicsView>
#include <QRectF>
#include <QPointF>
#include <QGraphicsItem>
#include <QGraphicsEllipseItem>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>
#include <QKeyEvent>
#include <CGAL/Qt/Converter.h>
#include <CGAL/Qt/GraphicsViewInput.h>
#include <CGAL/array.h>
namespace CGAL {
namespace Qt {
template <typename K>
class GraphicsViewCircleInput : public GraphicsViewInput
{
public:
GraphicsViewCircleInput(QObject *parent, QGraphicsScene* s, int pointsOnCircle=1);
protected:
virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
virtual void keyPressEvent(QKeyEvent *event);
bool eventFilter(QObject *obj, QEvent *event);
private:
typedef typename K::Point_2 Point_2;
int m_pointsOnCircle; // 1, 2 or 3
int count;
QGraphicsEllipseItem *qcircle;
QPointF qp, qq, qr;
Point_2 p, q, r;
QGraphicsScene *scene_;
Converter<K> convert;
};
template <typename K>
GraphicsViewCircleInput<K>::GraphicsViewCircleInput(QObject *parent, QGraphicsScene* s, int pointsOnCircle)
: GraphicsViewInput(parent), m_pointsOnCircle(pointsOnCircle),
count(0), qcircle(new QGraphicsEllipseItem()), scene_(s)
{
qcircle->setPen(QPen(::Qt::red, 0, ::Qt::SolidLine, ::Qt::RoundCap, ::Qt::RoundJoin));
qcircle->hide();
s->addItem(qcircle);
}
template <typename K>
void
GraphicsViewCircleInput<K>::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if(event->modifiers() & ::Qt::ShiftModifier){
return;
}
if(m_pointsOnCircle < 3){
if(count == 0){
qp = event->scenePos();
p = convert(qp);
count = 1;
} else {
qq = event->scenePos();
if(qp != qq){
qcircle->hide();
q = convert(qq);
if(m_pointsOnCircle == 1){
typename K::FT sd = squared_distance(p,q);
Q_EMIT generate(CGAL::make_object(std::make_pair(p, sd)));
} else {
Q_EMIT generate(CGAL::make_object(std::make_pair(p, q)));
}
count = 0;
}
}
} else {
if(count == 0){
qp = event->scenePos();
p = convert(qp);
count = 1;
} else if(count == 1){
qq = event->scenePos();
if(qp != qq){
q = convert(qq);
count = 2;
}
} else { // count == 2
qr = event->scenePos();
r = convert(qr);
typename K::Collinear_2 collinear;
if(! collinear(p,q,r)){
Q_EMIT generate(CGAL::make_object(CGAL::make_array(p,q,r)));
count = 0;
}
}
}
}
template <typename K>
void
GraphicsViewCircleInput<K>::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
CGAL::Bbox_2 bb;
typename K::Construct_circle_2 construct_circle;
if(count == 0){
qcircle->hide();
return;
} else if(count == 1) {
qq = event->scenePos();
q = convert(qq);
if(qp == qq){
qcircle->hide();
return;
} else {
if(m_pointsOnCircle == 1){
typename K::FT sd = squared_distance(p,q);
bb = construct_circle(p, sd).bbox();
} else {
bb = construct_circle(p, q).bbox();
}
}
} else { // count == 2
qr = event->scenePos();
r = convert(qr);
typename K::Collinear_2 collinear;
if(collinear(p,q,r)){
qcircle->hide();
return;
} else {
bb = construct_circle(p, q, r).bbox();
}
}
qcircle->setRect(bb.xmin(), bb.ymin(), bb.xmax()-bb.xmin(), bb.ymax()-bb.ymin());
qcircle->show();
}
template <typename K>
void
GraphicsViewCircleInput<K>::keyPressEvent ( QKeyEvent * event )
{
if(event->key() == ::Qt::Key_Delete){
if(count>0){
--count;
}
}
}
template <typename K>
bool
GraphicsViewCircleInput<K>::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::GraphicsSceneMousePress) {
QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
mousePressEvent(mouseEvent);
return true;
} else if (event->type() == QEvent::GraphicsSceneMouseMove) {
QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
mouseMoveEvent(mouseEvent);
return true;
} else if (event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
keyPressEvent(keyEvent);
return true;
} else if(event->type() == QEvent::GraphicsSceneMouseDoubleClick) {
QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
qp = mouseEvent->scenePos();
p = convert(qp);
Q_EMIT generate(CGAL::make_object(std::make_pair(p, 0.0)));
count = 0;
return true;
} else{
// standard event processing
return QObject::eventFilter(obj, event);
}
}
} // namespace Qt
} // namespace CGAL
#endif // CGAL_QT_GRAPHICS_VIEW_CIRCLE_INPUT_H
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