Method WriteFile

IO/Image/vtkPostScriptWriter.cxx:104–179

}

void vtkPostScriptWriter::WriteFile(
  ostream* file, vtkImageData* data, int extent[6], int wExtent[6])
{
  int idxC, idx0, idx1, idx2;
  unsigned char* ptr;
  unsigned long count = 0;
  unsigned long target;
  float progress = this->Progress;
  float area;
  static int itemsperline = 0;
  const char* hexits = "0123456789abcdef";

  // Make sure we actually have data.
  if (!data->GetPointData()->GetScalars())
  {
    vtkErrorMacro(<< "Could not get data from input.");
    return;
  }

  // take into consideration the scalar type
  switch (data->GetScalarType())
  {
    case VTK_UNSIGNED_CHAR:
      break;
    default:
      vtkErrorMacro("PostScriptWriter only accepts unsigned char scalars!");
      return;
  }

  area = ((extent[5] - extent[4] + 1) * (extent[3] - extent[2] + 1) * (extent[1] - extent[0] + 1)) /
    ((wExtent[5] - wExtent[4] + 1) * (wExtent[3] - wExtent[2] + 1) * (wExtent[1] - wExtent[0] + 1));

  int numComponents = data->GetNumberOfScalarComponents();
  // ignore alpha
  int maxComponent = numComponents;
  if (numComponents == 2)
  {
    maxComponent = 1;
  }
  if (numComponents == 4)
  {
    maxComponent = 3;
  }
  target =
    (unsigned long)((extent[5] - extent[4] + 1) * (extent[3] - extent[2] + 1) / (50.0 * area));
  target++;

  for (idx2 = extent[4]; idx2 <= extent[5]; ++idx2)
  {
    for (idx1 = extent[3]; idx1 >= extent[2]; idx1--)
    {
      if (!(count % target))
      {
        this->UpdateProgress(progress + count / (50.0 * target));
      }
      count++;
      // write out components one at a time because
      for (idxC = 0; idxC < maxComponent; idxC++)