Qt 5.7 | Qt Data Visualization | Bars Example | graphmodifier.cpp Example File

Qt 5.7.1 Reference Documentation

# graphmodifier.cpp Example File

bars/graphmodifier.cpp

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      #include "graphmodifier.h"
      #include <QtDataVisualization/qcategory3daxis.h>
      #include <QtDataVisualization/qvalue3daxis.h>
      #include <QtDataVisualization/qbardataproxy.h>
      #include <QtDataVisualization/q3dscene.h>
      #include <QtDataVisualization/q3dcamera.h>
      #include <QtDataVisualization/qbar3dseries.h>
      #include <QtDataVisualization/q3dtheme.h>
      #include <QtCore/QTime>
      #include <QtWidgets/QComboBox>
      #include <QtCore/qmath.h>

      using namespace QtDataVisualization;

      const QString celsiusString = QString(QChar(0xB0)) + "C";

      GraphModifier::GraphModifier(Q3DBars *bargraph)
          : m_graph(bargraph),
            m_xRotation(0.0f),
            m_yRotation(0.0f),
            m_fontSize(30),
            m_segments(4),
            m_subSegments(3),
            m_minval(-20.0f),
            m_maxval(20.0f),
            m_temperatureAxis(new QValue3DAxis),
            m_yearAxis(new QCategory3DAxis),
            m_monthAxis(new QCategory3DAxis),
            m_primarySeries(new QBar3DSeries),
            m_secondarySeries(new QBar3DSeries),
            m_barMesh(QAbstract3DSeries::MeshBevelBar),
            m_smooth(false)
      {
          m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualitySoftMedium);
          m_graph->activeTheme()->setBackgroundEnabled(false);
          m_graph->activeTheme()->setFont(QFont("Times New Roman", m_fontSize));
          m_graph->activeTheme()->setLabelBackgroundEnabled(true);
          m_graph->setMultiSeriesUniform(true);

          m_months << "January" << "February" << "March" << "April" << "May" << "June" << "July" << "August" << "September" << "October" << "November" << "December";
          m_years << "2006" << "2007" << "2008" << "2009" << "2010" << "2011" << "2012" << "2013";

          m_temperatureAxis->setTitle("Average temperature");
          m_temperatureAxis->setSegmentCount(m_segments);
          m_temperatureAxis->setSubSegmentCount(m_subSegments);
          m_temperatureAxis->setRange(m_minval, m_maxval);
          m_temperatureAxis->setLabelFormat(QString(QStringLiteral("%.1f ") + celsiusString));
          m_temperatureAxis->setLabelAutoRotation(30.0f);
          m_temperatureAxis->setTitleVisible(true);

          m_yearAxis->setTitle("Year");
          m_yearAxis->setLabelAutoRotation(30.0f);
          m_yearAxis->setTitleVisible(true);
          m_monthAxis->setTitle("Month");
          m_monthAxis->setLabelAutoRotation(30.0f);
          m_monthAxis->setTitleVisible(true);

          m_graph->setValueAxis(m_temperatureAxis);
          m_graph->setRowAxis(m_yearAxis);
          m_graph->setColumnAxis(m_monthAxis);

          m_primarySeries->setItemLabelFormat(QStringLiteral("Oulu - @colLabel @rowLabel: @valueLabel"));
          m_primarySeries->setMesh(QAbstract3DSeries::MeshBevelBar);
          m_primarySeries->setMeshSmooth(false);

          m_secondarySeries->setItemLabelFormat(QStringLiteral("Helsinki - @colLabel @rowLabel: @valueLabel"));
          m_secondarySeries->setMesh(QAbstract3DSeries::MeshBevelBar);
          m_secondarySeries->setMeshSmooth(false);
          m_secondarySeries->setVisible(false);

          m_graph->addSeries(m_primarySeries);
          m_graph->addSeries(m_secondarySeries);

          changePresetCamera();

          resetTemperatureData();

          // Set up property animations for zooming to the selected bar
          Q3DCamera *camera = m_graph->scene()->activeCamera();
          m_defaultAngleX = camera->xRotation();
          m_defaultAngleY = camera->yRotation();
          m_defaultZoom = camera->zoomLevel();
          m_defaultTarget = camera->target();

          m_animationCameraX.setTargetObject(camera);
          m_animationCameraY.setTargetObject(camera);
          m_animationCameraZoom.setTargetObject(camera);
          m_animationCameraTarget.setTargetObject(camera);

          m_animationCameraX.setPropertyName("xRotation");
          m_animationCameraY.setPropertyName("yRotation");
          m_animationCameraZoom.setPropertyName("zoomLevel");
          m_animationCameraTarget.setPropertyName("target");

          int duration = 1700;
          m_animationCameraX.setDuration(duration);
          m_animationCameraY.setDuration(duration);
          m_animationCameraZoom.setDuration(duration);
          m_animationCameraTarget.setDuration(duration);

          // The zoom always first zooms out above the graph and then zooms in
          qreal zoomOutFraction = 0.3;
          m_animationCameraX.setKeyValueAt(zoomOutFraction, QVariant::fromValue(0.0f));
          m_animationCameraY.setKeyValueAt(zoomOutFraction, QVariant::fromValue(90.0f));
          m_animationCameraZoom.setKeyValueAt(zoomOutFraction, QVariant::fromValue(50.0f));
          m_animationCameraTarget.setKeyValueAt(zoomOutFraction,
                                                QVariant::fromValue(QVector3D(0.0f, 0.0f, 0.0f)));
      }

      GraphModifier::~GraphModifier()
      {
          delete m_graph;
      }

      void GraphModifier::resetTemperatureData()
      {
          // Set up data
          static const float tempOulu[8][12] = {
              {-6.7f, -11.7f, -9.7f, 3.3f, 9.2f, 14.0f, 16.3f, 17.8f, 10.2f, 2.1f, -2.6f, -0.3f},    // 2006
              {-6.8f, -13.3f, 0.2f, 1.5f, 7.9f, 13.4f, 16.1f, 15.5f, 8.2f, 5.4f, -2.6f, -0.8f},      // 2007
              {-4.2f, -4.0f, -4.6f, 1.9f, 7.3f, 12.5f, 15.0f, 12.8f, 7.6f, 5.1f, -0.9f, -1.3f},      // 2008
              {-7.8f, -8.8f, -4.2f, 0.7f, 9.3f, 13.2f, 15.8f, 15.5f, 11.2f, 0.6f, 0.7f, -8.4f},      // 2009
              {-14.4f, -12.1f, -7.0f, 2.3f, 11.0f, 12.6f, 18.8f, 13.8f, 9.4f, 3.9f, -5.6f, -13.0f},  // 2010
              {-9.0f, -15.2f, -3.8f, 2.6f, 8.3f, 15.9f, 18.6f, 14.9f, 11.1f, 5.3f, 1.8f, -0.2f},     // 2011
              {-8.7f, -11.3f, -2.3f, 0.4f, 7.5f, 12.2f, 16.4f, 14.1f, 9.2f, 3.1f, 0.3f, -12.1f},     // 2012
              {-7.9f, -5.3f, -9.1f, 0.8f, 11.6f, 16.6f, 15.9f, 15.5f, 11.2f, 4.0f, 0.1f, -1.9f}      // 2013
          };

          static const float tempHelsinki[8][12] = {
              {-3.7f, -7.8f, -5.4f, 3.4f, 10.7f, 15.4f, 18.6f, 18.7f, 14.3f, 8.5f, 2.9f, 4.1f},      // 2006
              {-1.2f, -7.5f, 3.1f, 5.5f, 10.3f, 15.9f, 17.4f, 17.9f, 11.2f, 7.3f, 1.1f, 0.5f},       // 2007
              {-0.6f, 1.2f, 0.2f, 6.3f, 10.2f, 13.8f, 18.1f, 15.1f, 10.1f, 9.4f, 2.5f, 0.4f},        // 2008
              {-2.9f, -3.5f, -0.9f, 4.7f, 10.9f, 14.0f, 17.4f, 16.8f, 13.2f, 4.1f, 2.6f, -2.3f},     // 2009
              {-10.2f, -8.0f, -1.9f, 6.6f, 11.3f, 14.5f, 21.0f, 18.8f, 12.6f, 6.1f, -0.5f, -7.3f},   // 2010
              {-4.4f, -9.1f, -2.0f, 5.5f, 9.9f, 15.6f, 20.8f, 17.8f, 13.4f, 8.9f, 3.6f, 1.5f},       // 2011
              {-3.5f, -3.2f, -0.7f, 4.0f, 11.1f, 13.4f, 17.3f, 15.8f, 13.1f, 6.4f, 4.1f, -5.1f},     // 2012
              {-4.8f, -1.8f, -5.0f, 2.9f, 12.8f, 17.2f, 18.0f, 17.1f, 12.5f, 7.5f, 4.5f, 2.3f}       // 2013
          };

          // Create data arrays
          QBarDataArray *dataSet = new QBarDataArray;
          QBarDataArray *dataSet2 = new QBarDataArray;
          QBarDataRow *dataRow;
          QBarDataRow *dataRow2;

          dataSet->reserve(m_years.size());
          for (int year = 0; year < m_years.size(); year++) {
              // Create a data row
              dataRow = new QBarDataRow(m_months.size());
              dataRow2 = new QBarDataRow(m_months.size());
              for (int month = 0; month < m_months.size(); month++) {
                  // Add data to the row
                  (*dataRow)[month].setValue(tempOulu[year][month]);
                  (*dataRow2)[month].setValue(tempHelsinki[year][month]);
              }
              // Add the row to the set
              dataSet->append(dataRow);
              dataSet2->append(dataRow2);
          }

          // Add data to the data proxy (the data proxy assumes ownership of it)
          m_primarySeries->dataProxy()->resetArray(dataSet, m_years, m_months);
          m_secondarySeries->dataProxy()->resetArray(dataSet2, m_years, m_months);
      }

      void GraphModifier::changeRange(int range)
      {
          if (range >= m_years.count())
              m_yearAxis->setRange(0, m_years.count() - 1);
          else
              m_yearAxis->setRange(range, range);
      }

      void GraphModifier::changeStyle(int style)
      {
          QComboBox *comboBox = qobject_cast<QComboBox *>(sender());
          if (comboBox) {
              m_barMesh = QAbstract3DSeries::Mesh(comboBox->itemData(style).toInt());
              m_primarySeries->setMesh(m_barMesh);
              m_secondarySeries->setMesh(m_barMesh);
          }
      }

      void GraphModifier::changePresetCamera()
      {
          m_animationCameraX.stop();
          m_animationCameraY.stop();
          m_animationCameraZoom.stop();
          m_animationCameraTarget.stop();

          // Restore camera target in case animation has changed it
          m_graph->scene()->activeCamera()->setTarget(QVector3D(0.0f, 0.0f, 0.0f));

          static int preset = Q3DCamera::CameraPresetFront;

          m_graph->scene()->activeCamera()->setCameraPreset((Q3DCamera::CameraPreset)preset);

          if (++preset > Q3DCamera::CameraPresetDirectlyBelow)
              preset = Q3DCamera::CameraPresetFrontLow;
      }

      void GraphModifier::changeTheme(int theme)
      {
          Q3DTheme *currentTheme = m_graph->activeTheme();
          currentTheme->setType(Q3DTheme::Theme(theme));
          emit backgroundEnabledChanged(currentTheme->isBackgroundEnabled());
          emit gridEnabledChanged(currentTheme->isGridEnabled());
          emit fontChanged(currentTheme->font());
          emit fontSizeChanged(currentTheme->font().pointSize());
      }

      void GraphModifier::changeLabelBackground()
      {
          m_graph->activeTheme()->setLabelBackgroundEnabled(!m_graph->activeTheme()->isLabelBackgroundEnabled());
      }

      void GraphModifier::changeSelectionMode(int selectionMode)
      {
          QComboBox *comboBox = qobject_cast<QComboBox *>(sender());
          if (comboBox) {
              int flags = comboBox->itemData(selectionMode).toInt();
              m_graph->setSelectionMode(QAbstract3DGraph::SelectionFlags(flags));
          }
      }

      void GraphModifier::changeFont(const QFont &font)
      {
          QFont newFont = font;
          m_graph->activeTheme()->setFont(newFont);
      }

      void GraphModifier::changeFontSize(int fontsize)
      {
          m_fontSize = fontsize;
          QFont font = m_graph->activeTheme()->font();
          font.setPointSize(m_fontSize);
          m_graph->activeTheme()->setFont(font);
      }

      void GraphModifier::shadowQualityUpdatedByVisual(QAbstract3DGraph::ShadowQuality sq)
      {
          int quality = int(sq);
          // Updates the UI component to show correct shadow quality
          emit shadowQualityChanged(quality);
      }

      void GraphModifier::changeLabelRotation(int rotation)
      {
          m_temperatureAxis->setLabelAutoRotation(float(rotation));
          m_monthAxis->setLabelAutoRotation(float(rotation));
          m_yearAxis->setLabelAutoRotation(float(rotation));
      }

      void GraphModifier::setAxisTitleVisibility(bool enabled)
      {
          m_temperatureAxis->setTitleVisible(enabled);
          m_monthAxis->setTitleVisible(enabled);
          m_yearAxis->setTitleVisible(enabled);
      }

      void GraphModifier::setAxisTitleFixed(bool enabled)
      {
          m_temperatureAxis->setTitleFixed(enabled);
          m_monthAxis->setTitleFixed(enabled);
          m_yearAxis->setTitleFixed(enabled);
      }

      void GraphModifier::zoomToSelectedBar()
      {
          m_animationCameraX.stop();
          m_animationCameraY.stop();
          m_animationCameraZoom.stop();
          m_animationCameraTarget.stop();

          Q3DCamera *camera = m_graph->scene()->activeCamera();
          float currentX = camera->xRotation();
          float currentY = camera->yRotation();
          float currentZoom = camera->zoomLevel();
          QVector3D currentTarget = camera->target();

          m_animationCameraX.setStartValue(QVariant::fromValue(currentX));
          m_animationCameraY.setStartValue(QVariant::fromValue(currentY));
          m_animationCameraZoom.setStartValue(QVariant::fromValue(currentZoom));
          m_animationCameraTarget.setStartValue(QVariant::fromValue(currentTarget));

          QPoint selectedBar = m_graph->selectedSeries()
                  ? m_graph->selectedSeries()->selectedBar()
                  : QBar3DSeries::invalidSelectionPosition();

          if (selectedBar != QBar3DSeries::invalidSelectionPosition()) {
              // Normalize selected bar position within axis range to determine target coordinates
              QVector3D endTarget;
              float xMin = m_graph->columnAxis()->min();
              float xRange = m_graph->columnAxis()->max() - xMin;
              float zMin = m_graph->rowAxis()->min();
              float zRange = m_graph->rowAxis()->max() - zMin;
              endTarget.setX((selectedBar.y() - xMin) / xRange * 2.0f - 1.0f);
              endTarget.setZ((selectedBar.x() - zMin) / zRange * 2.0f - 1.0f);

              // Rotate the camera so that it always points approximately to the graph center
              qreal endAngleX = qAtan(qreal(endTarget.z() / endTarget.x())) / M_PI * -180.0 + 90.0;
              if (endTarget.x() > 0.0f)
                  endAngleX -= 180.0f;
              float barValue = m_graph->selectedSeries()->dataProxy()->itemAt(selectedBar.x(),
                                                                              selectedBar.y())->value();
              float endAngleY = barValue >= 0.0f ? 30.0f : -30.0f;
              if (m_graph->valueAxis()->reversed())
                  endAngleY *= -1.0f;

              m_animationCameraX.setEndValue(QVariant::fromValue(float(endAngleX)));
              m_animationCameraY.setEndValue(QVariant::fromValue(endAngleY));
              m_animationCameraZoom.setEndValue(QVariant::fromValue(250));
              m_animationCameraTarget.setEndValue(QVariant::fromValue(endTarget));
          } else {
              // No selected bar, so return to the default view
              m_animationCameraX.setEndValue(QVariant::fromValue(m_defaultAngleX));
              m_animationCameraY.setEndValue(QVariant::fromValue(m_defaultAngleY));
              m_animationCameraZoom.setEndValue(QVariant::fromValue(m_defaultZoom));
              m_animationCameraTarget.setEndValue(QVariant::fromValue(m_defaultTarget));
          }

          m_animationCameraX.start();
          m_animationCameraY.start();
          m_animationCameraZoom.start();
          m_animationCameraTarget.start();
      }

      void GraphModifier::changeShadowQuality(int quality)
      {
          QAbstract3DGraph::ShadowQuality sq = QAbstract3DGraph::ShadowQuality(quality);
          m_graph->setShadowQuality(sq);
          emit shadowQualityChanged(quality);
      }

      void GraphModifier::rotateX(int rotation)
      {
          m_xRotation = rotation;
          m_graph->scene()->activeCamera()->setCameraPosition(m_xRotation, m_yRotation);
      }

      void GraphModifier::rotateY(int rotation)
      {
          m_yRotation = rotation;
          m_graph->scene()->activeCamera()->setCameraPosition(m_xRotation, m_yRotation);
      }

      void GraphModifier::setBackgroundEnabled(int enabled)
      {
          m_graph->activeTheme()->setBackgroundEnabled(bool(enabled));
      }

      void GraphModifier::setGridEnabled(int enabled)
      {
          m_graph->activeTheme()->setGridEnabled(bool(enabled));
      }

      void GraphModifier::setSmoothBars(int smooth)
      {
          m_smooth = bool(smooth);
          m_primarySeries->setMeshSmooth(m_smooth);
          m_secondarySeries->setMeshSmooth(m_smooth);
      }

      void GraphModifier::setSeriesVisibility(int enabled)
      {
          m_secondarySeries->setVisible(bool(enabled));
      }

      void GraphModifier::setReverseValueAxis(int enabled)
      {
          m_graph->valueAxis()->setReversed(enabled);
      }

      void GraphModifier::setReflection(bool enabled)
      {
          m_graph->setReflection(enabled);
      }