Method UpdateLUT

Examples/Emscripten/Cxx/GeometryViewer/GeometryViewer.cxx:803–829

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//------------------------------------------------------------------------------
void GeometryViewer::Internal::UpdateLUT()
{
  auto mapper = this->Actor->GetMapper();
  if (!mapper)
  {
    return;
  }
  std::array<double, 2> scalarRange;
  mapper->GetScalarRange(scalarRange.data());
  vtkNew<vtkColorTransferFunction> lut;
  lut->SetColorSpaceToHSV();
  vtkNew<vtkColorSeries> colorSeries;
  colorSeries->SetColorScheme(PresetNames.at(this->ColorMapPreset));
  auto numColors = colorSeries->GetNumberOfColors();
  for (int i = 0; i < numColors; ++i)
  {
    vtkColor3ub color = colorSeries->GetColor(i);
    double dColor[3];
    dColor[0] = static_cast<double>(color[0]) / 255.0;
    dColor[1] = static_cast<double>(color[1]) / 255.0;
    dColor[2] = static_cast<double>(color[2]) / 255.0;
    double t =
      scalarRange[0] + (scalarRange[1] - scalarRange[0]) / (static_cast<double>(numColors) - 1) * i;
    lut->AddRGBPoint(t, dColor[0], dColor[1], dColor[2]);
  }
  mapper->SetLookupTable(lut);
}

//------------------------------------------------------------------------------
void GeometryViewer::Internal::FetchAvailableDataArrays(vtkDataObject* dataObject)