48e0c4df23
Change-Id: Ic804938fc352291d011800d21e549c10acac66fb Reviewed-by: Lars Knoll <lars.knoll@digia.com>
150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** 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 Digia Plc and its Subsidiary(-ies) 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 "edge.h"
|
|
#include "node.h"
|
|
|
|
#include <math.h>
|
|
|
|
#include <QPainter>
|
|
|
|
static const double Pi = 3.14159265358979323846264338327950288419717;
|
|
static double TwoPi = 2.0 * Pi;
|
|
|
|
//! [0]
|
|
Edge::Edge(Node *sourceNode, Node *destNode)
|
|
: arrowSize(10)
|
|
{
|
|
setAcceptedMouseButtons(0);
|
|
source = sourceNode;
|
|
dest = destNode;
|
|
source->addEdge(this);
|
|
dest->addEdge(this);
|
|
adjust();
|
|
}
|
|
//! [0]
|
|
|
|
//! [1]
|
|
Node *Edge::sourceNode() const
|
|
{
|
|
return source;
|
|
}
|
|
|
|
Node *Edge::destNode() const
|
|
{
|
|
return dest;
|
|
}
|
|
//! [1]
|
|
|
|
//! [2]
|
|
void Edge::adjust()
|
|
{
|
|
if (!source || !dest)
|
|
return;
|
|
|
|
QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0));
|
|
qreal length = line.length();
|
|
|
|
prepareGeometryChange();
|
|
|
|
if (length > qreal(20.)) {
|
|
QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length);
|
|
sourcePoint = line.p1() + edgeOffset;
|
|
destPoint = line.p2() - edgeOffset;
|
|
} else {
|
|
sourcePoint = destPoint = line.p1();
|
|
}
|
|
}
|
|
//! [2]
|
|
|
|
//! [3]
|
|
QRectF Edge::boundingRect() const
|
|
{
|
|
if (!source || !dest)
|
|
return QRectF();
|
|
|
|
qreal penWidth = 1;
|
|
qreal extra = (penWidth + arrowSize) / 2.0;
|
|
|
|
return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(),
|
|
destPoint.y() - sourcePoint.y()))
|
|
.normalized()
|
|
.adjusted(-extra, -extra, extra, extra);
|
|
}
|
|
//! [3]
|
|
|
|
//! [4]
|
|
void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
|
|
{
|
|
if (!source || !dest)
|
|
return;
|
|
|
|
QLineF line(sourcePoint, destPoint);
|
|
if (qFuzzyCompare(line.length(), qreal(0.)))
|
|
return;
|
|
//! [4]
|
|
|
|
//! [5]
|
|
// Draw the line itself
|
|
painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
|
|
painter->drawLine(line);
|
|
//! [5]
|
|
|
|
//! [6]
|
|
// Draw the arrows
|
|
double angle = ::acos(line.dx() / line.length());
|
|
if (line.dy() >= 0)
|
|
angle = TwoPi - angle;
|
|
|
|
QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize,
|
|
cos(angle + Pi / 3) * arrowSize);
|
|
QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
|
|
cos(angle + Pi - Pi / 3) * arrowSize);
|
|
QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize,
|
|
cos(angle - Pi / 3) * arrowSize);
|
|
QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize,
|
|
cos(angle - Pi + Pi / 3) * arrowSize);
|
|
|
|
painter->setBrush(Qt::black);
|
|
painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2);
|
|
painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2);
|
|
}
|
|
//! [6]
|