Method WriteData

IO/GeoJSON/vtkGeoJSONWriter.cxx:233–505

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

//------------------------------------------------------------------------------
void vtkGeoJSONWriter::WriteData()
{
  ostream* fp;
  vtkPolyData* input = vtkPolyData::SafeDownCast(this->GetInput());

  vtkDebugMacro(<< "Writing vtk polygonal data to geojson file...");
  fp = this->OpenFile();
  if (!fp)
  {
    return;
  }

  this->WriterHelper->append("{\n");
  this->WriterHelper->append("\"type\": \"Feature\",\n");
  vtkDataArray* da = input->GetPointData()->GetScalars();
  if (!da)
  {
    da = input->GetPointData()->GetArray(0);
  }
  if (da)
  {
    switch (this->ScalarFormat)
    {
      case 0:
        this->WriterHelper->append("\"properties\": {\"ScalarFormat\": \"none\"},\n");
        break;
      case 1:
        this->WriterHelper->append("\"properties\": {\"ScalarFormat\": \"rgb\"},\n");
        break;
      case 2:
        double rng[2];
        da->GetRange(rng);
        this->WriterHelper->append(
          "\"properties\": {\"ScalarFormat\": \"values\", \"ScalarRange\": [");
        this->WriterHelper->append(rng[0]);
        this->WriterHelper->append(",");
        this->WriterHelper->append(rng[1]);
        this->WriterHelper->append("] },\n");
        break;
    }
  }
  else
  {
    this->WriterHelper->append("\"properties\": {\"ScalarFormat\": \"none\"},\n");
  }
  this->WriterHelper->append("\"geometry\":\n");
  this->WriterHelper->append("{\n");
  this->WriterHelper->append("\"type\": \"GeometryCollection\",\n");
  this->WriterHelper->append("\"geometries\":\n");
  this->WriterHelper->append("[\n");

  const vtkIdType* cellPts = nullptr;
  vtkIdType cellSize = 0;
  vtkIdType numlines, numpolys;
  numlines = input->GetLines()->GetNumberOfCells();
  numpolys = input->GetPolys()->GetNumberOfCells();

  // VERTS