Method ConvertDataArrayToString

IO/MINC/vtkMINCImageAttributes.cxx:253–350

------------------------------------------------------------------------------ This method also has to store the resulting string internally.

//------------------------------------------------------------------------------
// This method also has to store the resulting string internally.
const char* vtkMINCImageAttributes::ConvertDataArrayToString(vtkDataArray* array)
{
  const char* resultStr = "";
  vtkIdType n = array->GetNumberOfTuples();
  if (n == 0)
  {
    return resultStr;
  }

  int dataType = array->GetDataType();
  if (dataType == VTK_CHAR)
  {
    vtkCharArray* charArray = vtkArrayDownCast<vtkCharArray>(array);
    if (charArray)
    {
      resultStr = charArray->GetPointer(0);
      // Check to see if string has a terminal null (the null might be
      // part of the attribute, or stored in the following byte)
      if ((n > 0 && resultStr[n - 1] == '\0') || (charArray->GetSize() > n && resultStr[n] == '\0'))
      {
        return resultStr;
      }
    }
  }

  std::ostringstream os;

  for (vtkIdType i = 0; i < n; i++)
  {
    double val = array->GetComponent(i, 0);
    if (dataType == VTK_DOUBLE || dataType == VTK_FLOAT)
    {
      // Use NetCDF's usual precision for printing the values
      char storage[128];
      if (dataType == VTK_DOUBLE)
      {
        auto result = vtk::format_to_n(storage, 128, "{:.15g}", val);
        *result.out = '\0';
      }
      else
      {
        auto result = vtk::format_to_n(storage, 128, "{:.7g}", val);
        *result.out = '\0';
      }
      // Add a decimal if there isn't one, to distinguish from int
      for (char* cp = storage; *cp != '.'; cp++)
      {
        if (*cp == '\0')
        {
          *cp++ = '.';
          *cp = '\0';
          break;
        }
      }
      os << storage;
    }
    else if (dataType == VTK_CHAR)
    {