236 lines
7.1 KiB
C++
236 lines
7.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "graphwidget.h"
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#include "edge.h"
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#include "node.h"
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#include <QDebug>
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#include <QGraphicsScene>
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#include <QWheelEvent>
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#include <QTime>
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#include <math.h>
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//lint -e429 custodial pointer '' likely not freed nor returned
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//lint -e665 unparenthesized parameter
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//lint -e666 expression with side effects passed to repeated parameter
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//lint -e1524 new in constructor for class '' which has no explicit destructor
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//lint -e1793 invoking non-const member function
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GraphWidget::GraphWidget()
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: timerId(0)
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{
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qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
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QGraphicsScene *_scene = new QGraphicsScene(this);
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_scene->setItemIndexMethod(QGraphicsScene::NoIndex);
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_scene->setSceneRect(-400, -400, 800, 800);
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setScene(_scene);
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setCacheMode(CacheBackground);
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setViewportUpdateMode(BoundingRectViewportUpdate);
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setRenderHint(QPainter::Antialiasing);
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setTransformationAnchor(AnchorUnderMouse);
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setResizeAnchor(AnchorViewCenter);
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Node *node1 = new Node(this);
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Node *node2 = new Node(this);
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Node *node3 = new Node(this);
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Node *node4 = new Node(this);
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centerNode = new Node(this);
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Node *node6 = new Node(this);
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Node *node7 = new Node(this);
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Node *node8 = new Node(this);
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Node *node9 = new Node(this);
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_scene->addItem(node1);
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_scene->addItem(node2);
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_scene->addItem(node3);
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_scene->addItem(node4);
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_scene->addItem(centerNode);
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_scene->addItem(node6);
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_scene->addItem(node7);
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_scene->addItem(node8);
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_scene->addItem(node9);
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_scene->addItem(new Edge(centerNode, node1));
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_scene->addItem(new Edge(centerNode, node2));
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_scene->addItem(new Edge(centerNode, node3));
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_scene->addItem(new Edge(centerNode, node4));
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_scene->addItem(new Edge(centerNode, node6));
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_scene->addItem(new Edge(centerNode, node7));
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_scene->addItem(new Edge(centerNode, node8));
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_scene->addItem(new Edge(centerNode, node9));
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node1->setPos(-100, -100);
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node2->setPos(0, -100);
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node3->setPos(100, -100);
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node4->setPos(-100, 0);
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centerNode->setPos(0, 0);
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node6->setPos(100, 0);
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node7->setPos(-100, 100);
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node8->setPos(0, 100);
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node9->setPos(100, 100);
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scale(qreal(0.8), qreal(0.8));
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setMinimumSize(400, 400);
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setWindowTitle(tr("Elastic IDA Nodes"));
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}
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void GraphWidget::itemMoved()
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{
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if ( !timerId )
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timerId = startTimer(10);
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}
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void GraphWidget::keyPressEvent(QKeyEvent *_event)
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{
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switch ( _event->key() )
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{
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case Qt::Key_Up:
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centerNode->moveBy(0, -20);
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break;
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case Qt::Key_Down:
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centerNode->moveBy(0, 20);
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break;
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case Qt::Key_Left:
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centerNode->moveBy(-20, 0);
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break;
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case Qt::Key_Right:
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centerNode->moveBy(20, 0);
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break;
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case Qt::Key_Plus:
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scaleView(qreal(1.2));
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break;
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case Qt::Key_Minus:
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scaleView(1 / qreal(1.2));
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break;
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case Qt::Key_Space:
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case Qt::Key_Enter:
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foreach ( QGraphicsItem *item, scene()->items() )
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{
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if ( qgraphicsitem_cast<Node *>(item) )
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item->setPos(-150 + qrand() % 300, -150 + qrand() % 300);
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}
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break;
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default:
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QGraphicsView::keyPressEvent(_event);
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break;
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}
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}
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void GraphWidget::timerEvent(QTimerEvent *_event)
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{
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Q_UNUSED(_event);
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QList<Node *> nodes;
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foreach ( QGraphicsItem *item, scene()->items() )
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{
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if ( Node *node = qgraphicsitem_cast<Node *>(item) )
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nodes << node;
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}
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foreach ( Node *node, nodes )
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node->calculateForces();
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bool itemsMoved = false;
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foreach ( Node *node, nodes )
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{
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if ( node->_advance() )
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itemsMoved = true;
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}
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if ( !itemsMoved )
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{
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killTimer(timerId);
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timerId = 0;
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}
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}
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void GraphWidget::wheelEvent(QWheelEvent *_event)
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{
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scaleView(pow((double)2, -_event->delta() / 240.0));
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}
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void GraphWidget::drawBackground(QPainter *painter, const QRectF &_rect)
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{
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Q_UNUSED(_rect);
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// Shadow
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QRectF _sceneRect = this->sceneRect();
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QRectF rightShadow(_sceneRect.right(), _sceneRect.top() + 5, 5, _sceneRect.height());
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QRectF bottomShadow(_sceneRect.left() + 5, _sceneRect.bottom(), _sceneRect.width(), 5);
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if ( rightShadow.intersects(_rect) || rightShadow.contains(_rect) )
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painter->fillRect(rightShadow, Qt::darkGray);
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if ( bottomShadow.intersects(_rect) || bottomShadow.contains(_rect) )
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painter->fillRect(bottomShadow, Qt::darkGray);
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// Fill
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QLinearGradient gradient(_sceneRect.topLeft(), _sceneRect.bottomRight());
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gradient.setColorAt(0, Qt::white);
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gradient.setColorAt(1, Qt::lightGray);
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painter->fillRect(_rect.intersected(_sceneRect), gradient);
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painter->setBrush(Qt::NoBrush);
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painter->drawRect(_sceneRect);
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// Text
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QRectF textRect(_sceneRect.left() + 4, _sceneRect.top() + 4,
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_sceneRect.width() - 4, _sceneRect.height() - 4);
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QString message(tr("Click and drag the nodes around, and zoom with the mouse "
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"wheel or the '+' and '-' keys"));
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QFont _font = painter->font();
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_font.setBold(true);
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_font.setPointSize(14);
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painter->setFont(_font);
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painter->setPen(Qt::lightGray);
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painter->drawText(textRect.translated(2, 2), message);
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painter->setPen(Qt::black);
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painter->drawText(textRect, message);
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}
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void GraphWidget::scaleView(qreal scaleFactor)
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{
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qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
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if ( factor < 0.07 || factor > 100 )
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return;
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scale(scaleFactor, scaleFactor);
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}
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