Method GetMetrics

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx:642–722

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//------------------------------------------------------------------------------
bool vtkMatplotlibMathTextUtilities::GetMetrics(
  vtkTextProperty* tprop, const char* str, int dpi, vtkTextRenderer::Metrics& metrics)
{
  if (!this->IsAvailable())
  {
    vtkErrorMacro(<< "Matplotlib rendering is unavailable.");
    return false;
  }

  if (!this->MaskParser)
  {
    if (!this->InitializeMaskParser())
    {
      vtkErrorMacro(<< "MaskParser is not initialized!");
      return false;
    }
  }

  // Configure math text font
  if (!this->SetMathTextFont(tprop))
  {
    return false;
  }

  // Get the font property used for all non math text.
  vtkSmartPyObject pyFontProp(this->GetFontProperties(tprop));
  if (this->CheckForError(pyFontProp))
  {
    return false;
  }

  // First, parse the string
  GridOfStrings strGrid;
  std::size_t maxNumberOfCells;
  if (!this->ParseString(str, strGrid, maxNumberOfCells))
  {
    vtkWarningMacro(<< "Failed to parse string.");
    return false;
  }

  std::uint64_t rows = 0;
  std::uint64_t cols = 0;
  if (!this->ComputeRowsAndCols(
        strGrid, maxNumberOfCells, tprop, pyFontProp.GetPointer(), dpi, rows, cols))
  {
    vtkWarningMacro(<< "Failed to compute rows and cols.");
    return false;
  }

  vtkDebugMacro(<< "Calculating metrics for '" << str << "'");

  int extent[4];
  this->GetJustifiedBBox(rows, cols, tprop, extent);

  // Determine the dimensions of the rotated image
  double angleDeg = tprop->GetOrientation();
  // Corners of original image
  double corners[4][2] = { { static_cast<double>(extent[0]), static_cast<double>(extent[2]) }, // TL