highlightseries.cpp Example File

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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 "highlightseries.h"

  using namespace QtDataVisualization;

  const float darkRedPos = 1.0f;
  const float redPos = 0.8f;
  const float yellowPos = 0.6f;
  const float greenPos = 0.4f;
  const float darkGreenPos = 0.2f;

  HighlightSeries::HighlightSeries()
      : m_width(100),
        m_height(100)
  {
      setDrawMode(QSurface3DSeries::DrawSurface);
      setFlatShadingEnabled(true);
      setVisible(false);
  }

  HighlightSeries::~HighlightSeries()
  {
  }

  void HighlightSeries::setTopographicSeries(TopographicSeries *series)
  {
      m_topographicSeries = series;
      m_srcWidth = m_topographicSeries->dataProxy()->array()->at(0)->size();
      m_srcHeight = m_topographicSeries->dataProxy()->array()->size();

      QObject::connect(m_topographicSeries, &QSurface3DSeries::selectedPointChanged,
                       this, &HighlightSeries::handlePositionChange);
  }

  void HighlightSeries::handlePositionChange(const QPoint &position)
  {
      m_position = position;

      if (position == invalidSelectionPosition()) {
          setVisible(false);

          return;
      }

      int halfWidth = m_width / 2;
      int halfHeight = m_height / 2;

      int startX = position.y() - halfWidth;
      if (startX < 0 )
          startX = 0;
      int endX = position.y() + halfWidth;
      if (endX > (m_srcWidth - 1))
          endX = m_srcWidth - 1;
      int startZ = position.x() - halfHeight;
      if (startZ < 0 )
          startZ = 0;
      int endZ = position.x() + halfHeight;
      if (endZ > (m_srcHeight - 1))
          endZ = m_srcHeight - 1;

      QSurfaceDataProxy *srcProxy = m_topographicSeries->dataProxy();
      const QSurfaceDataArray &srcArray = *srcProxy->array();

      QSurfaceDataArray *dataArray = new QSurfaceDataArray;
      dataArray->reserve(endZ - startZ);
      for (int i = startZ; i < endZ; i++) {
          QSurfaceDataRow *newRow = new QSurfaceDataRow(endX - startX);
          QSurfaceDataRow *srcRow = srcArray.at(i);
          for (int j = startX, p = 0; j < endX; j++, p++) {
              QVector3D pos = srcRow->at(j).position();
              (*newRow)[p].setPosition(QVector3D(pos.x(), pos.y() + 0.1f, pos.z()));
          }
          *dataArray << newRow;
      }

      dataProxy()->resetArray(dataArray);
      setVisible(true);
  }

  void HighlightSeries::handleGradientChange(float value)
  {
      float ratio = m_minHeight / value;

      QLinearGradient gr;
      gr.setColorAt(0.0f, Qt::black);
      gr.setColorAt(darkGreenPos * ratio, Qt::darkGreen);
      gr.setColorAt(greenPos * ratio, Qt::green);
      gr.setColorAt(yellowPos * ratio, Qt::yellow);
      gr.setColorAt(redPos * ratio, Qt::red);
      gr.setColorAt(darkRedPos * ratio, Qt::darkRed);

      setBaseGradient(gr);
      setColorStyle(Q3DTheme::ColorStyleRangeGradient);
  }