Method RenderOneCell

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx:962–1103

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bool vtkMatplotlibMathTextUtilities::RenderOneCell(vtkImageData* image, int bbox[4],
  std::int64_t rowStart, std::int64_t colStart, vtkSmartPyObject& pythonData,
  std::uint64_t pythonRows, std::uint64_t pythonCols, std::uint64_t cellRows,
  std::uint64_t cellCols, vtkTextProperty* tprop, const TextColors& tcolors)
{
  vtkDebugMacro("RenderOneCell start = ("
    << rowStart << "," << colStart << "). Drawing python data of size (" << pythonRows << ","
    << pythonCols << ") inside a cell of size (" << cellRows << "," << cellCols << ").");

  assert(cellCols >= pythonCols);
  assert(cellRows >= pythonRows);

  const std::int64_t rowEnd = rowStart - cellRows + 1;
  const std::int64_t colEnd = colStart + cellCols - 1;

  // Handle cell horizontal justification
  std::uint64_t colOffset;
  switch (tprop->GetJustification())
  {
    default:
    case VTK_TEXT_LEFT:
      colOffset = 0;
      break;
    case VTK_TEXT_CENTERED:
      colOffset = (cellCols - pythonCols) / 2;
      break;
    case VTK_TEXT_RIGHT:
      colOffset = (cellCols - pythonCols);
      break;
  }
  const std::int64_t pythonColStart = colStart + colOffset;
  const std::int64_t pythonColEnd = pythonColStart + pythonCols;

  // Handle cell vertical justification
  std::uint64_t rowOffset;
  switch (tprop->GetVerticalJustification())
  {
    default:
    case VTK_TEXT_BOTTOM:
      rowOffset = (cellRows - pythonRows);
      break;
    case VTK_TEXT_CENTERED:
      rowOffset = (cellRows - pythonRows) / 2;
      break;
    case VTK_TEXT_TOP:
      rowOffset = 0;
      break;
  }
  const std::int64_t pythonRowStart = rowStart - rowOffset;
  const std::int64_t pythonRowEnd = pythonRowStart - pythonRows;

  std::uint64_t ind = 0;
  for (std::int64_t row = rowStart; row >= rowEnd; --row)
  {
    for (std::int64_t col = colStart; col <= colEnd; ++col)
    {
      unsigned char* ptr = static_cast<unsigned char*>(image->GetScalarPointer(col, row, 0));