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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/GraphicsViewLineInput.h $
// $Id: include/CGAL/Qt/GraphicsViewLineInput.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_LINE_INPUT_H
#define CGAL_QT_GRAPHICS_VIEW_LINE_INPUT_H
#include <CGAL/license/GraphicsView.h>
#include <QGraphicsView>
#include <QRectF>
#include <QPointF>
#include <QGraphicsItem>
#include <QGraphicsLineItem>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>
#include <QKeyEvent>
#include <CGAL/Qt/Converter.h>
#include <CGAL/Qt/GraphicsViewInput.h>
#include <CGAL/Qt/utility.h>
namespace CGAL {
namespace Qt {
template <typename K>
class GraphicsViewLineInput : public GraphicsViewInput
{
public:
GraphicsViewLineInput(QObject *parent, QGraphicsScene* s);
protected:
virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
virtual void keyPressEvent(QKeyEvent *event);
bool eventFilter(QObject *obj, QEvent *event);
private:
QRectF boundingRect();
QLineF qlinef();
bool second;
QGraphicsLineItem line;
QPointF qsp, qtp;
typename K::Point_2 sp, tp;
typename K::Line_2 l;
QGraphicsScene *scene_;
Converter<K> convert;
};
template <typename K>
QRectF
GraphicsViewLineInput<K>::boundingRect()
{
QRectF rect = CGAL::Qt::viewportsBbox(scene_);
return rect;
}
template <typename K>
GraphicsViewLineInput<K>::GraphicsViewLineInput(QObject *parent, QGraphicsScene* s)
: GraphicsViewInput(parent), second(false), scene_(s)
{}
template <typename K>
QLineF
GraphicsViewLineInput<K>::qlinef()
{
sp = convert(qsp);
tp = convert(qtp);
typename K::Line_2 l(sp,tp);
QRectF qrect(boundingRect());
typename K::Iso_rectangle_2 rect;
rect = convert(qrect);
Object o = intersection(l,rect);
typename K::Segment_2 s;
assign(s, o);
return convert(s);
}
template <typename K>
void
GraphicsViewLineInput<K>::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if(event->modifiers() & ::Qt::ShiftModifier){
return;
}
if(second){
qtp = event->scenePos();
sp = convert(qsp);
tp = convert(qtp);
scene_->removeItem(&line);
Q_EMIT generate(CGAL::make_object(typename K::Line_2(sp,tp)));
} else {
qsp = event->scenePos();
qtp = QPointF(qsp.x()+1, qsp.y());
line.setLine(qlinef());
scene_->addItem(&line);
}
second = !second;
}
template <typename K>
void
GraphicsViewLineInput<K>::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
qtp = event->scenePos();
if(qtp == qsp){
qtp = QPointF(qsp.x()+1, qsp.y());
}
line.setLine(qlinef());
}
template <typename K>
void
GraphicsViewLineInput<K>::keyPressEvent ( QKeyEvent * event )
{
if(event->key() != ::Qt::Key_Delete){ // need an anchored namespace to get away from CGAL::Qt
return;
}
if(second){
scene_->removeItem(&line);
second = false;
}
}
template <typename K>
bool
GraphicsViewLineInput<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{
// standard event processing
return QObject::eventFilter(obj, event);
}
}
} // namespace Qt
} // namespace CGAL
#endif // CGAL_QT_GRAPHICS_VIEW_LINE_INPUT_H
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