Qt 5.9 | Qt Data Visualization | Textured Surface Example | highlightseries.cpp Example File

Qt 5.9.9 Reference Documentation

# highlightseries.cpp Example File

texturesurface/highlightseries.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 "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);
      }