Method ReadVrtFile

IO/Geometry/vtkProStarReader.cxx:137–204

read in the points from the .vrt file ---------------------------------------------------------------------------*\ Line 1: PROSTAR_VERTEX [newline] Line 2: 0 0 0 0 0 0 0 [newline] Body: [newline] \*---------------------------------------------------------------------------*/

\*---------------------------------------------------------------------------*/
bool vtkProStarReader::ReadVrtFile(vtkUnstructuredGrid* output, idMapping& mapPointId)
{
  mapPointId.clear();
  FILE* in = this->OpenFile(".vrt");
  if (in == nullptr)
  {
    return false;
  }

  constexpr int MAX_LINE = 1024;
  char rawLine[MAX_LINE];

  int errorCount = 0;
  vtk::scan_result_type<std::string_view, int> resultLabel;
  if (fgets(rawLine, MAX_LINE, in) != nullptr && strncmp(rawLine, "PROSTAR_VERTEX", 14) == 0 &&
    fgets(rawLine, MAX_LINE, in) != nullptr &&
    ((resultLabel = vtk::scan_int<int>(std::string_view(rawLine)))) && resultLabel->value() >= 4000)
  {
    vtkDebugMacro(<< "Got PROSTAR_VERTEX header");
  }
  else
  {
    vtkErrorMacro(<< "Error reading header for PROSTAR_VERTEX file");
    ++errorCount;
  }
  int lineLabel = resultLabel->value();

  vtkPoints* points = vtkPoints::New();
  // don't know the number of points a priori -- just pick some number
  points->Allocate(10000, 20000);

  int lineNr = 2;
  float xyz[3];
  vtkIdType nodeCount = 0;

  while (!errorCount && fgets(rawLine, MAX_LINE, in) != nullptr)
  {
    ++lineNr;
    auto result =
      vtk::scan<int, float, float, float>(std::string_view(rawLine), "{:d} {:f} {:f} {:f}");
    if (result)
    {
      std::tie(lineLabel, xyz[0], xyz[1], xyz[2]) = result->values();
      xyz[0] *= this->ScaleFactor;
      xyz[1] *= this->ScaleFactor;
      xyz[2] *= this->ScaleFactor;

      points->InsertNextPoint(xyz);
      vtkIdType nodeId = lineLabel;
      mapPointId.insert(std::make_pair(nodeId, nodeCount));
      ++nodeCount;
    }
    else
    {
      vtkErrorMacro(<< "Error reading point at line " << lineNr);
      ++errorCount;
    }
  }