Method DrawPathPS

Rendering/GL2PSOpenGL2/vtkOpenGLGL2PSHelperImpl.cxx:796–936

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

//------------------------------------------------------------------------------
void vtkOpenGLGL2PSHelperImpl::DrawPathPS(vtkPath* path, double rasterPos[3], double windowPos[2],
  unsigned char rgba[4], double scale[2], double rotateAngle, float strokeWidth,
  const std::string& label)
{
  vtkFloatArray* points = vtkArrayDownCast<vtkFloatArray>(path->GetPoints()->GetData());
  vtkIntArray* codes = path->GetCodes();

  if (points->GetNumberOfTuples() != codes->GetNumberOfTuples())
  {
    return;
  }

  std::stringstream out;
  out.setf(std::ios_base::left | std::ios_base::fixed);
  constexpr int floatPrec = 2;
  constexpr int floatWidth = 6;
  out.precision(floatPrec);
  out.width(floatWidth);

  float curveto[3][2];
  float curX = 0;
  float curY = 0;

  float* pt = points->GetPointer(0);
  int* code = codes->GetPointer(0);

  // These are only used in an assertion, ifdef silences warning on non-debug
  // builds
#ifndef NDEBUG
  float* ptBegin = pt;
  int* codeBegin = code;
#endif
  int* codeEnd = code + codes->GetNumberOfTuples();
  if (!label.empty())
  {
    out << "% " << label << endl;
  }
  out << "gsave" << endl;
  out << "initmatrix" << endl;
  out << windowPos[0] << " " << windowPos[1] << " translate" << endl;
  if (scale)
  {
    out << scale[0] << " " << scale[1] << " scale" << endl;
  }
  out << rotateAngle << " rotate" << endl;
  out << "newpath" << endl;
  while (code < codeEnd)
  {
    assert(pt - ptBegin == (code - codeBegin) * 3);

    switch (static_cast<vtkPath::ControlPointType>(*code))
    {
      case vtkPath::MOVE_TO:
        curX = *pt;
        curY = *(++pt);
        ++pt; // Flush z
        out << curX << " " << curY << " moveto\n";
        break;