236 lines
7.2 KiB
C++
236 lines
7.2 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 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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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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 <QtGui>
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#include <math.h>
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//! [0]
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GraphWidget::GraphWidget(QWidget *parent)
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: QGraphicsView(parent), timerId(0)
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{
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QGraphicsScene *scene = new QGraphicsScene(this);
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scene->setItemIndexMethod(QGraphicsScene::NoIndex);
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scene->setSceneRect(-200, -200, 400, 400);
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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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scale(qreal(0.8), qreal(0.8));
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setMinimumSize(400, 400);
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setWindowTitle(tr("Elastic Nodes"));
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//! [0]
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//! [1]
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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(node1, node2));
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scene->addItem(new Edge(node2, node3));
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scene->addItem(new Edge(node2, centerNode));
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scene->addItem(new Edge(node3, node6));
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scene->addItem(new Edge(node4, node1));
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scene->addItem(new Edge(node4, centerNode));
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scene->addItem(new Edge(centerNode, node6));
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scene->addItem(new Edge(centerNode, node8));
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scene->addItem(new Edge(node6, node9));
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scene->addItem(new Edge(node7, node4));
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scene->addItem(new Edge(node8, node7));
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scene->addItem(new Edge(node9, node8));
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node1->setPos(-50, -50);
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node2->setPos(0, -50);
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node3->setPos(50, -50);
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node4->setPos(-50, 0);
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centerNode->setPos(0, 0);
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node6->setPos(50, 0);
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node7->setPos(-50, 50);
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node8->setPos(0, 50);
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node9->setPos(50, 50);
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}
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//! [1]
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//! [2]
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void GraphWidget::itemMoved()
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{
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if (!timerId)
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timerId = startTimer(1000 / 25);
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}
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//! [2]
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//! [3]
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void GraphWidget::keyPressEvent(QKeyEvent *event)
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{
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switch (event->key()) {
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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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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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}
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}
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//! [3]
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//! [4]
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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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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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if (node->advance())
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itemsMoved = true;
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}
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if (!itemsMoved) {
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killTimer(timerId);
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timerId = 0;
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}
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}
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//! [4]
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//! [5]
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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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//! [5]
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//! [6]
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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.intersect(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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//! [6]
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//! [7]
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void GraphWidget::scaleView(qreal scaleFactor)
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{
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qreal factor = transform().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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//! [7]
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