main.cpp Example File

itemmodel/main.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:GPL$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3 or (at your option) any later version
 ** approved by the KDE Free Qt Foundation. The licenses are as published by
 ** the Free Software Foundation and appearing in the file LICENSE.GPL3
 ** included in the packaging of this file. Please review the following
 ** information to ensure the GNU General Public License requirements will
 ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtDataVisualization/q3dbars.h>
 #include <QtDataVisualization/qcategory3daxis.h>
 #include <QtDataVisualization/qitemmodelbardataproxy.h>
 #include <QtDataVisualization/qvalue3daxis.h>
 #include <QtDataVisualization/q3dscene.h>
 #include <QtDataVisualization/q3dcamera.h>
 #include <QtDataVisualization/qbar3dseries.h>
 #include <QtDataVisualization/q3dtheme.h>

 #include <QtWidgets/QApplication>
 #include <QtWidgets/QVBoxLayout>
 #include <QtWidgets/QTableWidget>
 #include <QtGui/QScreen>
 #include <QtCore/QRandomGenerator>
 #include <QtCore/QTimer>
 #include <QtGui/QFont>
 #include <QtCore/QDebug>
 #include <QtWidgets/QHeaderView>
 #include <QtWidgets/QMessageBox>

 #define USE_STATIC_DATA

 using namespace QtDataVisualization;

 class GraphDataGenerator : public QObject
 {
 public:
     explicit GraphDataGenerator(Q3DBars *bargraph, QTableWidget *tableWidget);
     ~GraphDataGenerator();

     void setupModel();
     void addRow();
     void changeStyle();
     void changePresetCamera();
     void changeTheme();
     void start();
     void selectFromTable(const QPoint &selection);
     void selectedFromTable(int currentRow, int currentColumn, int previousRow, int previousColumn);
     void fixTableSize();

 private:
     Q3DBars *m_graph;
     QTimer *m_dataTimer;
     int m_columnCount;
     int m_rowCount;
     QTableWidget *m_tableWidget; // not owned
 };

 GraphDataGenerator::GraphDataGenerator(Q3DBars *bargraph, QTableWidget *tableWidget)
     : m_graph(bargraph),
       m_dataTimer(0),
       m_columnCount(100),
       m_rowCount(50),
       m_tableWidget(tableWidget)
 {
     // Set up bar specifications; make the bars as wide as they are deep,
     // and add a small space between them
     m_graph->setBarThickness(1.0f);
     m_graph->setBarSpacing(QSizeF(0.2, 0.2));

 #ifndef USE_STATIC_DATA
     // Set up sample space; make it as deep as it's wide
     m_graph->rowAxis()->setRange(0, m_rowCount);
     m_graph->columnAxis()->setRange(0, m_columnCount);
     m_tableWidget->setColumnCount(m_columnCount);

     // Set selection mode to full
     m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemRowAndColumn);

     // Hide axis labels by explicitly setting one empty string as label list
     m_graph->rowAxis()->setLabels(QStringList(QString()));
     m_graph->columnAxis()->setLabels(QStringList(QString()));

     m_graph->seriesList().at(0)->setItemLabelFormat(QStringLiteral("@valueLabel"));
 #else
     // Set selection mode to slice row
     m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndRow | QAbstract3DGraph::SelectionSlice);

 #endif

     // Set theme
     m_graph->activeTheme()->setType(Q3DTheme::ThemeDigia);

     // Set font
     m_graph->activeTheme()->setFont(QFont("Impact", 20));

     // Set preset camera position
     m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront);
 }

 GraphDataGenerator::~GraphDataGenerator()
 {
     if (m_dataTimer) {
         m_dataTimer->stop();
         delete m_dataTimer;
     }
     delete m_graph;
 }

 void GraphDataGenerator::start()
 {
 #ifndef USE_STATIC_DATA
     m_dataTimer = new QTimer();
     m_dataTimer->setTimerType(Qt::CoarseTimer);
     QObject::connect(m_dataTimer, &QTimer::timeout, this, &GraphDataGenerator::addRow);
     m_dataTimer->start(0);
     m_tableWidget->setFixedWidth(m_graph->width());
 #else
     setupModel();

     // Table needs to be shown before the size of its headers can be accurately obtained,
     // so we postpone it a bit
     m_dataTimer = new QTimer();
     m_dataTimer->setSingleShot(true);
     QObject::connect(m_dataTimer, &QTimer::timeout, this, &GraphDataGenerator::fixTableSize);
     m_dataTimer->start(0);
 #endif
 }

 void GraphDataGenerator::setupModel()
 {
     // Set up row and column names
     QStringList days;
     days << "Monday" << "Tuesday" << "Wednesday" << "Thursday" << "Friday" << "Saturday" << "Sunday";
     QStringList weeks;
     weeks << "week 1" << "week 2" << "week 3" << "week 4" << "week 5";

     // Set up data         Mon  Tue  Wed  Thu  Fri  Sat  Sun
     float hours[5][7] = {{2.0f, 1.0f, 3.0f, 0.2f, 1.0f, 5.0f, 10.0f},     // week 1
                          {0.5f, 1.0f, 3.0f, 1.0f, 2.0f, 2.0f, 3.0f},      // week 2
                          {1.0f, 1.0f, 2.0f, 1.0f, 4.0f, 4.0f, 4.0f},      // week 3
                          {0.0f, 1.0f, 0.0f, 0.0f, 2.0f, 2.0f, 0.3f},      // week 4
                          {3.0f, 3.0f, 6.0f, 2.0f, 2.0f, 1.0f, 1.0f}};     // week 5

     // Add labels
     m_graph->rowAxis()->setTitle("Week of year");
     m_graph->rowAxis()->setTitleVisible(true);
     m_graph->columnAxis()->setTitle("Day of week");
     m_graph->columnAxis()->setTitleVisible(true);
     m_graph->valueAxis()->setTitle("Hours spent on the Internet");
     m_graph->valueAxis()->setTitleVisible(true);
     m_graph->valueAxis()->setLabelFormat("%.1f h");

     m_tableWidget->setRowCount(5);
     m_tableWidget->setColumnCount(7);
     m_tableWidget->setHorizontalHeaderLabels(days);
     m_tableWidget->setVerticalHeaderLabels(weeks);
     m_tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     m_tableWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     m_tableWidget->setCurrentCell(-1, -1);
     m_tableWidget->setSelectionMode(QAbstractItemView::SingleSelection);

     for (int week = 0; week < weeks.size(); week++) {
         for (int day = 0; day < days.size(); day++) {
             QModelIndex index = m_tableWidget->model()->index(week, day);
             m_tableWidget->model()->setData(index, hours[week][day]);
         }
     }
 }

 void GraphDataGenerator::addRow()
 {
     m_tableWidget->model()->insertRow(0);
     if (m_tableWidget->model()->rowCount() > m_rowCount)
         m_tableWidget->model()->removeRow(m_rowCount);
     for (int i = 0; i < m_columnCount; i++) {
         QModelIndex index = m_tableWidget->model()->index(0, i);
         m_tableWidget->model()->setData(index,
             ((float)i / (float)m_columnCount) / 2.0f +
                                         (float)(QRandomGenerator::global()->bounded(30)) / 100.0f);
     }
     m_tableWidget->resizeColumnsToContents();
 }

 void GraphDataGenerator::selectFromTable(const QPoint &selection)
 {
     m_tableWidget->setFocus();
     m_tableWidget->setCurrentCell(selection.x(), selection.y());
 }

 void GraphDataGenerator::selectedFromTable(int currentRow, int currentColumn,
                                            int previousRow, int previousColumn)
 {
     Q_UNUSED(previousRow)
     Q_UNUSED(previousColumn)
     m_graph->seriesList().at(0)->setSelectedBar(QPoint(currentRow, currentColumn));
 }

 void GraphDataGenerator::fixTableSize()
 {
     int width = m_tableWidget->horizontalHeader()->length();
     width += m_tableWidget->verticalHeader()->width();
     m_tableWidget->setFixedWidth(width + 2);
     int height = m_tableWidget->verticalHeader()->length();
     height += m_tableWidget->horizontalHeader()->height();
     m_tableWidget->setFixedHeight(height + 2);
 }

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
     Q3DBars *graph = new Q3DBars();
     QWidget *container = QWidget::createWindowContainer(graph);

     if (!graph->hasContext()) {
         QMessageBox msgBox;
         msgBox.setText("Couldn't initialize the OpenGL context.");
         msgBox.exec();
         return -1;
     }

     QSize screenSize = graph->screen()->size();
     container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 2));
     container->setMaximumSize(screenSize);
     container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     container->setFocusPolicy(Qt::StrongFocus);

     QWidget widget;
     QVBoxLayout *layout = new QVBoxLayout(&widget);
     QTableWidget *tableWidget = new QTableWidget(&widget);
     layout->addWidget(container, 1);
     layout->addWidget(tableWidget, 1, Qt::AlignHCenter);

     tableWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     tableWidget->setAlternatingRowColors(true);
     widget.setWindowTitle(QStringLiteral("Hours spent on the Internet"));

     // Since we are dealing with QTableWidget, the model will already have data sorted properly
     // into rows and columns, so we simply set useModelCategories property to true to utilize this.
     QItemModelBarDataProxy *proxy = new QItemModelBarDataProxy(tableWidget->model());
     proxy->setUseModelCategories(true);
     QBar3DSeries *series = new QBar3DSeries(proxy);
     series->setMesh(QAbstract3DSeries::MeshPyramid);
     graph->addSeries(series);

     GraphDataGenerator generator(graph, tableWidget);
     QObject::connect(series, &QBar3DSeries::selectedBarChanged, &generator,
                      &GraphDataGenerator::selectFromTable);
     QObject::connect(tableWidget, &QTableWidget::currentCellChanged, &generator,
                      &GraphDataGenerator::selectedFromTable);

     widget.show();
     generator.start();
     return app.exec();
 }