225 lines
6.1 KiB
C++
225 lines
6.1 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2011 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.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** 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 Nokia Corporation 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 <QGraphicsScene>
|
|
#include <QGraphicsSceneMouseEvent>
|
|
#include <QPainter>
|
|
#include <QStyleOption>
|
|
|
|
#include "edge.h"
|
|
#include "node.h"
|
|
#include "graphwidget.h"
|
|
|
|
//! [0]
|
|
Node::Node(GraphWidget *graphWidget)
|
|
: graph(graphWidget)
|
|
{
|
|
setFlag(ItemIsMovable);
|
|
setFlag(ItemSendsGeometryChanges);
|
|
setCacheMode(DeviceCoordinateCache);
|
|
setZValue(-1);
|
|
}
|
|
//! [0]
|
|
|
|
//! [1]
|
|
void Node::addEdge(Edge *edge)
|
|
{
|
|
edgeList << edge;
|
|
edge->adjust();
|
|
}
|
|
|
|
QList<Edge *> Node::edges() const
|
|
{
|
|
return edgeList;
|
|
}
|
|
//! [1]
|
|
|
|
//! [2]
|
|
void Node::calculateForces()
|
|
{
|
|
if (!scene() || scene()->mouseGrabberItem() == this) {
|
|
newPos = pos();
|
|
return;
|
|
}
|
|
//! [2]
|
|
|
|
//! [3]
|
|
// Sum up all forces pushing this item away
|
|
qreal xvel = 0;
|
|
qreal yvel = 0;
|
|
foreach (QGraphicsItem *item, scene()->items()) {
|
|
Node *node = qgraphicsitem_cast<Node *>(item);
|
|
if (!node)
|
|
continue;
|
|
|
|
QPointF vec = mapToItem(node, 0, 0);
|
|
qreal dx = vec.x();
|
|
qreal dy = vec.y();
|
|
double l = 2.0 * (dx * dx + dy * dy);
|
|
if (l > 0) {
|
|
xvel += (dx * 150.0) / l;
|
|
yvel += (dy * 150.0) / l;
|
|
}
|
|
}
|
|
//! [3]
|
|
|
|
//! [4]
|
|
// Now subtract all forces pulling items together
|
|
double weight = (edgeList.size() + 1) * 10;
|
|
foreach (Edge *edge, edgeList) {
|
|
QPointF vec;
|
|
if (edge->sourceNode() == this)
|
|
vec = mapToItem(edge->destNode(), 0, 0);
|
|
else
|
|
vec = mapToItem(edge->sourceNode(), 0, 0);
|
|
xvel -= vec.x() / weight;
|
|
yvel -= vec.y() / weight;
|
|
}
|
|
//! [4]
|
|
|
|
//! [5]
|
|
if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
|
|
xvel = yvel = 0;
|
|
//! [5]
|
|
|
|
//! [6]
|
|
QRectF sceneRect = scene()->sceneRect();
|
|
newPos = pos() + QPointF(xvel, yvel);
|
|
newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));
|
|
newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));
|
|
}
|
|
//! [6]
|
|
|
|
//! [7]
|
|
bool Node::advance()
|
|
{
|
|
if (newPos == pos())
|
|
return false;
|
|
|
|
setPos(newPos);
|
|
return true;
|
|
}
|
|
//! [7]
|
|
|
|
//! [8]
|
|
QRectF Node::boundingRect() const
|
|
{
|
|
#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
|
|
// Add some extra space around the circle for easier touching with finger
|
|
qreal adjust = 30;
|
|
return QRectF( -10 - adjust, -10 - adjust,
|
|
20 + adjust * 2, 20 + adjust * 2);
|
|
#else
|
|
qreal adjust = 2;
|
|
return QRectF( -10 - adjust, -10 - adjust,
|
|
23 + adjust, 23 + adjust);
|
|
#endif
|
|
}
|
|
//! [8]
|
|
|
|
//! [9]
|
|
QPainterPath Node::shape() const
|
|
{
|
|
QPainterPath path;
|
|
#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
|
|
// Add some extra space around the circle for easier touching with finger
|
|
path.addEllipse( -40, -40, 80, 80);
|
|
#else
|
|
path.addEllipse(-10, -10, 20, 20);
|
|
#endif
|
|
return path;
|
|
}
|
|
//! [9]
|
|
|
|
//! [10]
|
|
void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
|
|
{
|
|
painter->setPen(Qt::NoPen);
|
|
painter->setBrush(Qt::darkGray);
|
|
painter->drawEllipse(-7, -7, 20, 20);
|
|
|
|
QRadialGradient gradient(-3, -3, 10);
|
|
if (option->state & QStyle::State_Sunken) {
|
|
gradient.setCenter(3, 3);
|
|
gradient.setFocalPoint(3, 3);
|
|
gradient.setColorAt(1, QColor(Qt::yellow).light(120));
|
|
gradient.setColorAt(0, QColor(Qt::darkYellow).light(120));
|
|
} else {
|
|
gradient.setColorAt(0, Qt::yellow);
|
|
gradient.setColorAt(1, Qt::darkYellow);
|
|
}
|
|
painter->setBrush(gradient);
|
|
|
|
painter->setPen(QPen(Qt::black, 0));
|
|
painter->drawEllipse(-10, -10, 20, 20);
|
|
}
|
|
//! [10]
|
|
|
|
//! [11]
|
|
QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
|
|
{
|
|
switch (change) {
|
|
case ItemPositionHasChanged:
|
|
foreach (Edge *edge, edgeList)
|
|
edge->adjust();
|
|
graph->itemMoved();
|
|
break;
|
|
default:
|
|
break;
|
|
};
|
|
|
|
return QGraphicsItem::itemChange(change, value);
|
|
}
|
|
//! [11]
|
|
|
|
//! [12]
|
|
void Node::mousePressEvent(QGraphicsSceneMouseEvent *event)
|
|
{
|
|
update();
|
|
QGraphicsItem::mousePressEvent(event);
|
|
}
|
|
|
|
void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
|
|
{
|
|
update();
|
|
QGraphicsItem::mouseReleaseEvent(event);
|
|
}
|
|
//! [12]
|