Method SaveColorMap

Remoting/Views/vtkSMTransferFunctionProxy.cxx:943–1033

----------------------------------------------------------------------------

//----------------------------------------------------------------------------
bool vtkSMTransferFunctionProxy::SaveColorMap(vtkPVXMLElement* xml)
{
  if (!xml)
  {
    vtkWarningMacro("'xml' cannot be nullptr");
    return false;
  }

  xml->SetName("ColorMap");

  bool indexedLookup = vtkSMPropertyHelper(this, "IndexedLookup").GetAsInt() != 0;
  xml->AddAttribute("indexedLookup", indexedLookup ? "1" : "0");

  if (!indexedLookup)
  {
    std::string space = vtkSMPropertyHelper(this, "ColorSpace").GetAsString();
    if (space == "HSV" && vtkSMPropertyHelper(this, "HSVWrap").GetAsInt() == 1)
    {
      xml->AddAttribute("space", "Wrapped");
    }
    else
    {
      xml->AddAttribute("space", space.c_str());
    }
  }

  // Add the control points.
  vtkSMProperty* controlPointsProperty =
    indexedLookup ? this->GetProperty("IndexedColors") : GetControlPointsProperty(this);
  if (!controlPointsProperty)
  {
    return false;
  }

  vtkSMPropertyHelper cntrlPoints(controlPointsProperty);
  unsigned int num_elements = cntrlPoints.GetNumberOfElements();
  if (num_elements > 0)
  {
    if (indexedLookup)
    {
      // Save (r,g,b) tuples for categorical colors.
      std::vector<vtkTuple<double, 3>> points;
      points.resize(num_elements / 3);
      cntrlPoints.Get(points[0].GetData(), num_elements);

      for (size_t cc = 0; cc < points.size(); cc++)
      {
        vtkNew<vtkPVXMLElement> child;
        child->SetName("Point");
        child->AddAttribute("r", points[cc].GetData()[1]);
        child->AddAttribute("g", points[cc].GetData()[2]);
        child->AddAttribute("b", points[cc].GetData()[3]);
        child->AddAttribute("o", 1.0);
        xml->AddNestedElement(child);
      }
    }
    else
    {