cd46a2daf5
Update files using old header.LGPL3 to header.LGPL Update files using old FDL template to use new one Update files using old BSD template to use new one Change-Id: I36a78272516f9953d02956522f285b40adfc8915 Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
159 lines
5.2 KiB
C++
159 lines
5.2 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
**
|
|
** BSD License Usage
|
|
** Alternatively, you may use this file under the terms of the BSD license
|
|
** as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of The Qt Company Ltd nor the names of its
|
|
** contributors may be used to endorse or promote products derived
|
|
** from this software without specific prior written permission.
|
|
**
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
|
|
#include "arrow.h"
|
|
|
|
#include <math.h>
|
|
|
|
#include <QPen>
|
|
#include <QPainter>
|
|
|
|
const qreal Pi = 3.14;
|
|
|
|
//! [0]
|
|
Arrow::Arrow(DiagramItem *startItem, DiagramItem *endItem, QGraphicsItem *parent)
|
|
: QGraphicsLineItem(parent)
|
|
{
|
|
myStartItem = startItem;
|
|
myEndItem = endItem;
|
|
setFlag(QGraphicsItem::ItemIsSelectable, true);
|
|
myColor = Qt::black;
|
|
setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
|
|
}
|
|
//! [0]
|
|
|
|
//! [1]
|
|
QRectF Arrow::boundingRect() const
|
|
{
|
|
qreal extra = (pen().width() + 20) / 2.0;
|
|
|
|
return QRectF(line().p1(), QSizeF(line().p2().x() - line().p1().x(),
|
|
line().p2().y() - line().p1().y()))
|
|
.normalized()
|
|
.adjusted(-extra, -extra, extra, extra);
|
|
}
|
|
//! [1]
|
|
|
|
//! [2]
|
|
QPainterPath Arrow::shape() const
|
|
{
|
|
QPainterPath path = QGraphicsLineItem::shape();
|
|
path.addPolygon(arrowHead);
|
|
return path;
|
|
}
|
|
//! [2]
|
|
|
|
//! [3]
|
|
void Arrow::updatePosition()
|
|
{
|
|
QLineF line(mapFromItem(myStartItem, 0, 0), mapFromItem(myEndItem, 0, 0));
|
|
setLine(line);
|
|
}
|
|
//! [3]
|
|
|
|
//! [4]
|
|
void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *,
|
|
QWidget *)
|
|
{
|
|
if (myStartItem->collidesWithItem(myEndItem))
|
|
return;
|
|
|
|
QPen myPen = pen();
|
|
myPen.setColor(myColor);
|
|
qreal arrowSize = 20;
|
|
painter->setPen(myPen);
|
|
painter->setBrush(myColor);
|
|
//! [4] //! [5]
|
|
|
|
QLineF centerLine(myStartItem->pos(), myEndItem->pos());
|
|
QPolygonF endPolygon = myEndItem->polygon();
|
|
QPointF p1 = endPolygon.first() + myEndItem->pos();
|
|
QPointF p2;
|
|
QPointF intersectPoint;
|
|
QLineF polyLine;
|
|
for (int i = 1; i < endPolygon.count(); ++i) {
|
|
p2 = endPolygon.at(i) + myEndItem->pos();
|
|
polyLine = QLineF(p1, p2);
|
|
QLineF::IntersectType intersectType =
|
|
polyLine.intersect(centerLine, &intersectPoint);
|
|
if (intersectType == QLineF::BoundedIntersection)
|
|
break;
|
|
p1 = p2;
|
|
}
|
|
|
|
setLine(QLineF(intersectPoint, myStartItem->pos()));
|
|
//! [5] //! [6]
|
|
|
|
double angle = ::acos(line().dx() / line().length());
|
|
if (line().dy() >= 0)
|
|
angle = (Pi * 2) - angle;
|
|
|
|
QPointF arrowP1 = line().p1() + QPointF(sin(angle + Pi / 3) * arrowSize,
|
|
cos(angle + Pi / 3) * arrowSize);
|
|
QPointF arrowP2 = line().p1() + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
|
|
cos(angle + Pi - Pi / 3) * arrowSize);
|
|
|
|
arrowHead.clear();
|
|
arrowHead << line().p1() << arrowP1 << arrowP2;
|
|
//! [6] //! [7]
|
|
painter->drawLine(line());
|
|
painter->drawPolygon(arrowHead);
|
|
if (isSelected()) {
|
|
painter->setPen(QPen(myColor, 1, Qt::DashLine));
|
|
QLineF myLine = line();
|
|
myLine.translate(0, 4.0);
|
|
painter->drawLine(myLine);
|
|
myLine.translate(0,-8.0);
|
|
painter->drawLine(myLine);
|
|
}
|
|
}
|
|
//! [7]
|