Qt 5.7 | Qt Data Visualization | Custom Input Example | scatterdatamodifier.cpp Example File

Qt 5.7.1 Reference Documentation

# scatterdatamodifier.cpp Example File

custominput/scatterdatamodifier.cpp

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      #include "scatterdatamodifier.h"

      #include <QtDataVisualization/QScatterDataProxy>
      #include <QtDataVisualization/QValue3DAxis>
      #include <QtDataVisualization/Q3DScene>
      #include <QtDataVisualization/Q3DCamera>
      #include <QtDataVisualization/QScatter3DSeries>
      #include <QtDataVisualization/Q3DTheme>
      #include <QtCore/qmath.h>
      #include <QtCore/QTextStream>
      #include <QtCore/QDebug>

      using namespace QtDataVisualization;

      ScatterDataModifier::ScatterDataModifier(Q3DScatter *scatter)
          : m_graph(scatter),
            m_inputHandler(new CustomInputHandler())
      {
          m_graph->activeTheme()->setType(Q3DTheme::ThemeDigia);
          m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityMedium);
          m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront);

          m_graph->setAxisX(new QValue3DAxis);
          m_graph->setAxisY(new QValue3DAxis);
          m_graph->setAxisZ(new QValue3DAxis);

          m_graph->axisX()->setRange(-10.0f, 10.0f);
          m_graph->axisY()->setRange(-5.0f, 5.0f);
          m_graph->axisZ()->setRange(-5.0f, 5.0f);

          QScatter3DSeries *series = new QScatter3DSeries;
          series->setItemLabelFormat(QStringLiteral("@xLabel, @yLabel, @zLabel"));
          series->setMesh(QAbstract3DSeries::MeshCube);
          series->setItemSize(0.15f);
          m_graph->addSeries(series);

          m_animationCameraX = new QPropertyAnimation(m_graph->scene()->activeCamera(), "xRotation");
          m_animationCameraX->setDuration(20000);
          m_animationCameraX->setStartValue(QVariant::fromValue(0.0f));
          m_animationCameraX->setEndValue(QVariant::fromValue(360.0f));
          m_animationCameraX->setLoopCount(-1);

          QPropertyAnimation *upAnimation = new QPropertyAnimation(m_graph->scene()->activeCamera(), "yRotation");
          upAnimation->setDuration(9000);
          upAnimation->setStartValue(QVariant::fromValue(5.0f));
          upAnimation->setEndValue(QVariant::fromValue(45.0f));

          QPropertyAnimation *downAnimation = new QPropertyAnimation(m_graph->scene()->activeCamera(), "yRotation");
          downAnimation->setDuration(9000);
          downAnimation->setStartValue(QVariant::fromValue(45.0f));
          downAnimation->setEndValue(QVariant::fromValue(5.0f));

          m_animationCameraY = new QSequentialAnimationGroup();
          m_animationCameraY->setLoopCount(-1);
          m_animationCameraY->addAnimation(upAnimation);
          m_animationCameraY->addAnimation(downAnimation);

          m_animationCameraX->start();
          m_animationCameraY->start();

          // Give ownership of the handler to the graph and make it the active handler
          m_graph->setActiveInputHandler(m_inputHandler);

          m_selectionTimer = new QTimer(this);
          m_selectionTimer->setInterval(10);
          m_selectionTimer->setSingleShot(false);
          QObject::connect(m_selectionTimer, &QTimer::timeout, this,
                           &ScatterDataModifier::triggerSelection);
          m_selectionTimer->start();
      }

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

      void ScatterDataModifier::start()
      {
          addData();
      }

      void ScatterDataModifier::addData()
      {
          QVector<QVector3D> itemList;

          // Read data items from the file to QVector
          QTextStream stream;
          QFile dataFile(":/data/data.txt");
          if (dataFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
              stream.setDevice(&dataFile);
              while (!stream.atEnd()) {
                  QString line = stream.readLine();
                  if (line.startsWith("#")) // Ignore comments
                      continue;
                  QStringList strList = line.split(",", QString::SkipEmptyParts);
                  // Each line has three data items: xPos, yPos and zPos value
                  if (strList.size() < 3) {
                      qWarning() << "Invalid row read from data:" << line;
                      continue;
                  }
                  itemList.append(QVector3D(
                                       strList.at(0).trimmed().toFloat(),
                                       strList.at(1).trimmed().toFloat(),
                                       strList.at(2).trimmed().toFloat()));
              }
          } else {
              qWarning() << "Unable to open data file:" << dataFile.fileName();
          }

          // Add data from the QVector to datamodel
          QScatterDataArray *dataArray = new QScatterDataArray;
          dataArray->resize(itemList.count());
          QScatterDataItem *ptrToDataArray = &dataArray->first();
          for (int i = 0; i < itemList.count(); i++) {
              ptrToDataArray->setPosition(itemList.at(i));
              ptrToDataArray++;
          }

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

      void ScatterDataModifier::toggleCameraAnimation()
      {
          if (m_animationCameraX->state() != QAbstractAnimation::Paused) {
              m_animationCameraX->pause();
              m_animationCameraY->pause();
          } else {
              m_animationCameraX->resume();
              m_animationCameraY->resume();
          }
      }

      void ScatterDataModifier::triggerSelection()
      {
          m_graph->scene()->setSelectionQueryPosition(m_inputHandler->inputPosition());
      }

      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);
      }