Method ToJSON

IO/CellGrid/vtkCellGridWriter.cxx:242–390

}

bool vtkCellGridWriter::ToJSON(nlohmann::json& data, vtkCellGrid* grid)
{
  // Iterate all the vtkDataSetAttributes held by the grid.
  // As we go, store a map from each array in each vtkDataSetAttributes
  // to a "location" for the array so we can refer to the arrays later
  // by a persistent name instead of by pointer.
  std::unordered_map<vtkAbstractArray*, vtkStringToken> arrayLocations;
  auto arrayGroups = nlohmann::json::object();
  for (const auto& entry : grid->GetArrayGroups())
  {
    std::string groupName;
    vtkStringToken groupToken(entry.first);
    if (!groupToken.Data().empty())
    {
      groupName = groupToken.Data();
    }
    else
    {
      std::ostringstream groupId;
      groupId << entry.first;
      groupName = groupId.str();
    }
    nlohmann::json arraysInGroup;

    // Fetch arrays serving in specific roles.
    vtkDataArray* groupScalars = entry.second->GetScalars();
    vtkDataArray* groupVectors = entry.second->GetVectors();
    vtkDataArray* groupTensors = entry.second->GetTensors();
    vtkDataArray* groupTCoords = entry.second->GetTCoords();
    vtkDataArray* groupTangents = entry.second->GetTangents();
    vtkDataArray* groupGlobalIds = entry.second->GetGlobalIds();
    vtkAbstractArray* groupPedigreeIds = entry.second->GetPedigreeIds();
    vtkDataArray* groupRationalWeights = entry.second->GetRationalWeights();
    vtkDataArray* groupHigherOrderDegrees = entry.second->GetHigherOrderDegrees();

    for (vtkIdType ii = 0; ii < entry.second->GetNumberOfArrays(); ++ii)
    {
      vtkAbstractArray* arr = entry.second->GetAbstractArray(ii);
      if (!arr)
      {
        continue;
      }
      arrayLocations[arr] = groupName;
      nlohmann::json arrayRecord{ { "name", arr->GetName() },
        { "tuples", arr->GetNumberOfTuples() }, { "components", arr->GetNumberOfComponents() },
        { "type", dataTypeToString(arr->GetDataType()) }, { "data", serializeArrayValues(arr) } };
      if (arr == groupScalars)
      {
        arrayRecord["default_scalars"] = true;
      }
      if (arr == groupVectors)
      {
        arrayRecord["default_vectors"] = true;
      }
      if (arr == groupTensors)
      {
        arrayRecord["default_tensors"] = true;
      }