surfacegraph.cpp Example File

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  #include "surfacegraph.h"

  #include <QtDataVisualization/QValue3DAxis>
  #include <QtDataVisualization/Q3DTheme>
  #include <QtGui/QImage>
  #include <QtCore/qmath.h>

  using namespace QtDataVisualization;

  const int sampleCountX = 50;
  const int sampleCountZ = 50;
  const int heightMapGridStepX = 6;
  const int heightMapGridStepZ = 6;
  const float sampleMin = -8.0f;
  const float sampleMax = 8.0f;

  SurfaceGraph::SurfaceGraph(Q3DSurface *surface)
      : m_graph(surface)
  {
      m_graph->setAxisX(new QValue3DAxis);
      m_graph->setAxisY(new QValue3DAxis);
      m_graph->setAxisZ(new QValue3DAxis);

      m_sqrtSinProxy = new QSurfaceDataProxy();
      m_sqrtSinSeries = new QSurface3DSeries(m_sqrtSinProxy);
      fillSqrtSinProxy();

      QImage heightMapImage(":/maps/mountain");
      m_heightMapProxy = new QHeightMapSurfaceDataProxy(heightMapImage);
      m_heightMapSeries = new QSurface3DSeries(m_heightMapProxy);
      m_heightMapSeries->setItemLabelFormat(QStringLiteral("(@xLabel, @zLabel): @yLabel"));
      m_heightMapProxy->setValueRanges(34.0f, 40.0f, 18.0f, 24.0f);
      m_heightMapWidth = heightMapImage.width();
      m_heightMapHeight = heightMapImage.height();
  }

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

  void SurfaceGraph::fillSqrtSinProxy()
  {
      float stepX = (sampleMax - sampleMin) / float(sampleCountX - 1);
      float stepZ = (sampleMax - sampleMin) / float(sampleCountZ - 1);

      QSurfaceDataArray *dataArray = new QSurfaceDataArray;
      dataArray->reserve(sampleCountZ);
      for (int i = 0 ; i < sampleCountZ ; i++) {
          QSurfaceDataRow *newRow = new QSurfaceDataRow(sampleCountX);
          // Keep values within range bounds, since just adding step can cause minor drift due
          // to the rounding errors.
          float z = qMin(sampleMax, (i * stepZ + sampleMin));
          int index = 0;
          for (int j = 0; j < sampleCountX; j++) {
              float x = qMin(sampleMax, (j * stepX + sampleMin));
              float R = qSqrt(z * z + x * x) + 0.01f;
              float y = (qSin(R) / R + 0.24f) * 1.61f;
              (*newRow)[index++].setPosition(QVector3D(x, y, z));
          }
          *dataArray << newRow;
      }

      m_sqrtSinProxy->resetArray(dataArray);
  }

  void SurfaceGraph::enableSqrtSinModel(bool enable)
  {
      if (enable) {
          m_sqrtSinSeries->setDrawMode(QSurface3DSeries::DrawSurfaceAndWireframe);
          m_sqrtSinSeries->setFlatShadingEnabled(true);

          m_graph->axisX()->setLabelFormat("%.2f");
          m_graph->axisZ()->setLabelFormat("%.2f");
          m_graph->axisX()->setRange(sampleMin, sampleMax);
          m_graph->axisY()->setRange(0.0f, 2.0f);
          m_graph->axisZ()->setRange(sampleMin, sampleMax);
          m_graph->axisX()->setLabelAutoRotation(30);
          m_graph->axisY()->setLabelAutoRotation(90);
          m_graph->axisZ()->setLabelAutoRotation(30);

          m_graph->removeSeries(m_heightMapSeries);
          m_graph->addSeries(m_sqrtSinSeries);

          // Reset range sliders for Sqrt&Sin
          m_rangeMinX = sampleMin;
          m_rangeMinZ = sampleMin;
          m_stepX = (sampleMax - sampleMin) / float(sampleCountX - 1);
          m_stepZ = (sampleMax - sampleMin) / float(sampleCountZ - 1);
          m_axisMinSliderX->setMaximum(sampleCountX - 2);
          m_axisMinSliderX->setValue(0);
          m_axisMaxSliderX->setMaximum(sampleCountX - 1);
          m_axisMaxSliderX->setValue(sampleCountX - 1);
          m_axisMinSliderZ->setMaximum(sampleCountZ - 2);
          m_axisMinSliderZ->setValue(0);
          m_axisMaxSliderZ->setMaximum(sampleCountZ - 1);
          m_axisMaxSliderZ->setValue(sampleCountZ - 1);
      }
  }

  void SurfaceGraph::enableHeightMapModel(bool enable)
  {
      if (enable) {
          m_heightMapSeries->setDrawMode(QSurface3DSeries::DrawSurface);
          m_heightMapSeries->setFlatShadingEnabled(false);

          m_graph->axisX()->setLabelFormat("%.1f N");
          m_graph->axisZ()->setLabelFormat("%.1f E");
          m_graph->axisX()->setRange(34.0f, 40.0f);
          m_graph->axisY()->setAutoAdjustRange(true);
          m_graph->axisZ()->setRange(18.0f, 24.0f);

          m_graph->axisX()->setTitle(QStringLiteral("Latitude"));
          m_graph->axisY()->setTitle(QStringLiteral("Height"));
          m_graph->axisZ()->setTitle(QStringLiteral("Longitude"));

          m_graph->removeSeries(m_sqrtSinSeries);
          m_graph->addSeries(m_heightMapSeries);

          // Reset range sliders for height map
          int mapGridCountX = m_heightMapWidth / heightMapGridStepX;
          int mapGridCountZ = m_heightMapHeight / heightMapGridStepZ;
          m_rangeMinX = 34.0f;
          m_rangeMinZ = 18.0f;
          m_stepX = 6.0f / float(mapGridCountX - 1);
          m_stepZ = 6.0f / float(mapGridCountZ - 1);
          m_axisMinSliderX->setMaximum(mapGridCountX - 2);
          m_axisMinSliderX->setValue(0);
          m_axisMaxSliderX->setMaximum(mapGridCountX - 1);
          m_axisMaxSliderX->setValue(mapGridCountX - 1);
          m_axisMinSliderZ->setMaximum(mapGridCountZ - 2);
          m_axisMinSliderZ->setValue(0);
          m_axisMaxSliderZ->setMaximum(mapGridCountZ - 1);
          m_axisMaxSliderZ->setValue(mapGridCountZ - 1);
      }
  }

  void SurfaceGraph::adjustXMin(int min)
  {
      float minX = m_stepX * float(min) + m_rangeMinX;

      int max = m_axisMaxSliderX->value();
      if (min >= max) {
          max = min + 1;
          m_axisMaxSliderX->setValue(max);
      }
      float maxX = m_stepX * max + m_rangeMinX;

      setAxisXRange(minX, maxX);
  }

  void SurfaceGraph::adjustXMax(int max)
  {
      float maxX = m_stepX * float(max) + m_rangeMinX;

      int min = m_axisMinSliderX->value();
      if (max <= min) {
          min = max - 1;
          m_axisMinSliderX->setValue(min);
      }
      float minX = m_stepX * min + m_rangeMinX;

      setAxisXRange(minX, maxX);
  }

  void SurfaceGraph::adjustZMin(int min)
  {
      float minZ = m_stepZ * float(min) + m_rangeMinZ;

      int max = m_axisMaxSliderZ->value();
      if (min >= max) {
          max = min + 1;
          m_axisMaxSliderZ->setValue(max);
      }
      float maxZ = m_stepZ * max + m_rangeMinZ;

      setAxisZRange(minZ, maxZ);
  }

  void SurfaceGraph::adjustZMax(int max)
  {
      float maxX = m_stepZ * float(max) + m_rangeMinZ;

      int min = m_axisMinSliderZ->value();
      if (max <= min) {
          min = max - 1;
          m_axisMinSliderZ->setValue(min);
      }
      float minX = m_stepZ * min + m_rangeMinZ;

      setAxisZRange(minX, maxX);
  }

  void SurfaceGraph::setAxisXRange(float min, float max)
  {
      m_graph->axisX()->setRange(min, max);
  }

  void SurfaceGraph::setAxisZRange(float min, float max)
  {
      m_graph->axisZ()->setRange(min, max);
  }

  void SurfaceGraph::changeTheme(int theme)
  {
      m_graph->activeTheme()->setType(Q3DTheme::Theme(theme));
  }

  void SurfaceGraph::setBlackToYellowGradient()
  {
      QLinearGradient gr;
      gr.setColorAt(0.0, Qt::black);
      gr.setColorAt(0.33, Qt::blue);
      gr.setColorAt(0.67, Qt::red);
      gr.setColorAt(1.0, Qt::yellow);

      m_graph->seriesList().at(0)->setBaseGradient(gr);
      m_graph->seriesList().at(0)->setColorStyle(Q3DTheme::ColorStyleRangeGradient);
  }

  void SurfaceGraph::setGreenToRedGradient()
  {
      QLinearGradient gr;
      gr.setColorAt(0.0, Qt::darkGreen);
      gr.setColorAt(0.5, Qt::yellow);
      gr.setColorAt(0.8, Qt::red);
      gr.setColorAt(1.0, Qt::darkRed);

      m_graph->seriesList().at(0)->setBaseGradient(gr);
      m_graph->seriesList().at(0)->setColorStyle(Q3DTheme::ColorStyleRangeGradient);
  }