highlightseries.cpp Example File

texturesurface/highlightseries.cpp
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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);
 }