Method StringToPath

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx:1478–1711

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

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

  vtkDebugMacro(<< "Converting '" << str << "' into a vtkPath...");

  // Matplotlib path codes:
  const int pathStop = 0;
  const int pathMoveTo = 1;
  const int pathLineTo = 2;
  const int pathCurve3 = 3;
  const int pathCurve4 = 4;
  const int pathClosePoly = 0x4f;

  // List sizes:
  Py_ssize_t numCodes;
  Py_ssize_t numVerts;

  // Temp vars:
  float origin[2] = { 0.0, 0.0 };
  float vert[2];
  float delta[2] = { 0.0, 0.0 };
  int code;
  bool hasOrigin = false;

  // Bounding box for all control points, used for justification
  float cbox[4] = { VTK_FLOAT_MAX, VTK_FLOAT_MAX, VTK_FLOAT_MIN, VTK_FLOAT_MIN };

  // The path is always generated using a 100pt font @72 dpi. Use this factor to
  // recover the font.
  const float fontScale = (tprop->GetFontSize() / 100.f) * (dpi / 72.f);

  path->Reset();

  // Create the font property
  vtkSmartPyObject pyFontProp(this->GetFontProperties(tprop));
  if (this->CheckForError(pyFontProp))
  {
    return false;
  }

  vtkPythonScopeGilEnsurer gilEnsurer;
  vtkSmartPyObject pyResultTuple(PyObject_CallMethod(this->PathParser,
    const_cast<char*>("get_text_path"), const_cast<char*>("Osi"),