133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
|
|
** All rights reserved.
|
|
** Contact: Nokia Corporation (qt-info@nokia.com)
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:LGPL$
|
|
** Commercial Usage
|
|
** Licensees holding valid Qt Commercial licenses may use this file in
|
|
** accordance with the Qt Commercial License Agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and Nokia.
|
|
**
|
|
** GNU Lesser General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU Lesser
|
|
** General Public License version 2.1 as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.LGPL included in the
|
|
** packaging of this file. Please review the following information to
|
|
** ensure the GNU Lesser General Public License version 2.1 requirements
|
|
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
|
|
**
|
|
** In addition, as a special exception, Nokia gives you certain additional
|
|
** rights. These rights are described in the Nokia Qt LGPL Exception
|
|
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
|
|
**
|
|
** GNU General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU
|
|
** General Public License version 3.0 as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.GPL included in the
|
|
** packaging of this file. Please review the following information to
|
|
** ensure the GNU General Public License version 3.0 requirements will be
|
|
** met: http://www.gnu.org/copyleft/gpl.html.
|
|
**
|
|
** If you have questions regarding the use of this file, please contact
|
|
** Nokia at qt-info@nokia.com.
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include <QPainter>
|
|
|
|
#include "edge.h"
|
|
#include "node.h"
|
|
|
|
#include <math.h>
|
|
|
|
static const double Pi = 3.14159265358979323846264338327950288419717;
|
|
|
|
Edge::Edge(Node *sourceNode, Node *destNode)
|
|
: arrowSize(10)
|
|
{
|
|
setAcceptedMouseButtons(0);
|
|
source = sourceNode;
|
|
dest = destNode;
|
|
source->addEdge(this);
|
|
dest->addEdge(this);
|
|
adjust();
|
|
}
|
|
|
|
Edge::~Edge()
|
|
{
|
|
}
|
|
|
|
Node *Edge::sourceNode() const
|
|
{
|
|
return source;
|
|
}
|
|
|
|
void Edge::setSourceNode(Node *node)
|
|
{
|
|
source = node;
|
|
adjust();
|
|
}
|
|
|
|
Node *Edge::destNode() const
|
|
{
|
|
return dest;
|
|
}
|
|
|
|
void Edge::setDestNode(Node *node)
|
|
{
|
|
dest = node;
|
|
adjust();
|
|
}
|
|
|
|
void Edge::adjust()
|
|
{
|
|
if (!source || !dest)
|
|
return;
|
|
|
|
QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0));
|
|
qreal length = line.length();
|
|
prepareGeometryChange();
|
|
int ballSize = source->getBallSize();
|
|
if (length > qreal(ballSize)) {
|
|
QPointF edgeOffset((line.dx() * ballSize / 2) / length, (line.dy() * ballSize / 2) / length);
|
|
sourcePoint = line.p1() + edgeOffset;
|
|
destPoint = line.p2() - edgeOffset;
|
|
} else {
|
|
sourcePoint = destPoint = line.p1();
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
|
|
{
|
|
if (!source || !dest)
|
|
return;
|
|
|
|
QLineF line(sourcePoint, destPoint);
|
|
if (qFuzzyCompare(line.length(), qreal(0.)))
|
|
return;
|
|
|
|
// Draw the line itself
|
|
painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
|
|
painter->drawLine(line);
|
|
}
|