Qt 5.8 | Qt Data Visualization | Scatter Example | scatterdatamodifier.cpp Example File

Qt 5.8.0 Reference Documentation

# scatterdatamodifier.cpp Example File

scatter/scatterdatamodifier.cpp

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      #include "scatterdatamodifier.h"
      #include <QtDataVisualization/qscatterdataproxy.h>
      #include <QtDataVisualization/qvalue3daxis.h>
      #include <QtDataVisualization/q3dscene.h>
      #include <QtDataVisualization/q3dcamera.h>
      #include <QtDataVisualization/qscatter3dseries.h>
      #include <QtDataVisualization/q3dtheme.h>
      #include <QtCore/qmath.h>
      #include <QtWidgets/QComboBox>

      using namespace QtDataVisualization;

      //#define RANDOM_SCATTER // Uncomment this to switch to random scatter

      const int numberOfItems = 3600;
      const float curveDivider = 3.0f;
      const int lowerNumberOfItems = 900;
      const float lowerCurveDivider = 0.75f;

      ScatterDataModifier::ScatterDataModifier(Q3DScatter *scatter)
          : m_graph(scatter),
            m_fontSize(40.0f),
            m_style(QAbstract3DSeries::MeshSphere),
            m_smooth(true),
            m_itemCount(lowerNumberOfItems),
            m_curveDivider(lowerCurveDivider)
      {
          m_graph->activeTheme()->setType(Q3DTheme::ThemeEbony);
          QFont font = m_graph->activeTheme()->font();
          font.setPointSize(m_fontSize);
          m_graph->activeTheme()->setFont(font);
          m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualitySoftLow);
          m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront);

          QScatterDataProxy *proxy = new QScatterDataProxy;
          QScatter3DSeries *series = new QScatter3DSeries(proxy);
          series->setItemLabelFormat(QStringLiteral("@xTitle: @xLabel @yTitle: @yLabel @zTitle: @zLabel"));
          series->setMeshSmooth(m_smooth);
          m_graph->addSeries(series);

          addData();
      }

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

      void ScatterDataModifier::addData()
      {
          // Configure the axes according to the data
          m_graph->axisX()->setTitle("X");
          m_graph->axisY()->setTitle("Y");
          m_graph->axisZ()->setTitle("Z");

          QScatterDataArray *dataArray = new QScatterDataArray;
          dataArray->resize(m_itemCount);
          QScatterDataItem *ptrToDataArray = &dataArray->first();

      #ifdef RANDOM_SCATTER
          for (int i = 0; i < m_itemCount; i++) {
              ptrToDataArray->setPosition(randVector());
              ptrToDataArray++;
          }
      #else
          float limit = qSqrt(m_itemCount) / 2.0f;
          for (float i = -limit; i < limit; i++) {
              for (float j = -limit; j < limit; j++) {
                  ptrToDataArray->setPosition(QVector3D(i + 0.5f,
                                                        qCos(qDegreesToRadians((i * j) / m_curveDivider)),
                                                        j + 0.5f));
                  ptrToDataArray++;
              }
          }
      #endif

          m_graph->seriesList().at(0)->dataProxy()->resetArray(dataArray);
      }

      void ScatterDataModifier::changeStyle(int style)
      {
          QComboBox *comboBox = qobject_cast<QComboBox *>(sender());
          if (comboBox) {
              m_style = QAbstract3DSeries::Mesh(comboBox->itemData(style).toInt());
              if (m_graph->seriesList().size())
                  m_graph->seriesList().at(0)->setMesh(m_style);
          }
      }

      void ScatterDataModifier::setSmoothDots(int smooth)
      {
          m_smooth = bool(smooth);
          QScatter3DSeries *series = m_graph->seriesList().at(0);
          series->setMeshSmooth(m_smooth);
      }

      void ScatterDataModifier::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());
      }

      void ScatterDataModifier::changePresetCamera()
      {
          static int preset = Q3DCamera::CameraPresetFrontLow;

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

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

      void ScatterDataModifier::changeLabelStyle()
      {
          m_graph->activeTheme()->setLabelBackgroundEnabled(!m_graph->activeTheme()->isLabelBackgroundEnabled());
      }

      void ScatterDataModifier::changeFont(const QFont &font)
      {
          QFont newFont = font;
          newFont.setPointSizeF(m_fontSize);
          m_graph->activeTheme()->setFont(newFont);
      }

      void ScatterDataModifier::shadowQualityUpdatedByVisual(QAbstract3DGraph::ShadowQuality sq)
      {
          int quality = int(sq);
          emit shadowQualityChanged(quality); // connected to a checkbox in main.cpp
      }

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

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

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

      void ScatterDataModifier::toggleItemCount()
      {
          if (m_itemCount == numberOfItems) {
              m_itemCount = lowerNumberOfItems;
              m_curveDivider = lowerCurveDivider;
          } else {
              m_itemCount = numberOfItems;
              m_curveDivider = curveDivider;
          }
          m_graph->seriesList().at(0)->dataProxy()->resetArray(0);
          addData();
      }

      QVector3D ScatterDataModifier::randVector()
      {
          return QVector3D(
                      (float)(rand() % 100) / 2.0f - (float)(rand() % 100) / 2.0f,
                      (float)(rand() % 100) / 100.0f - (float)(rand() % 100) / 100.0f,
                      (float)(rand() % 100) / 2.0f - (float)(rand() % 100) / 2.0f);
      }