Qt 5.11 | Qt Data Visualization | Item Model Example | main.cpp Example File

Qt Data Visualization | Commercial or GPLv3

# main.cpp Example File

itemmodel/main.cpp

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      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
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      #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();
      }