Qt 5.9 | Qt Data Visualization | Surface Example | surfacegraph.cpp Example File

Qt 5.9.9 Reference Documentation

# surfacegraph.cpp Example File

surface/surfacegraph.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 "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);
      }