Method Paint

Rendering/Matplotlib/Testing/Cxx/TestStringToPath.cxx:65–107

This function aims to test the primitives provided by the 2D API.

// This function aims to test the primitives provided by the 2D API.
bool StringToPathContextTest::Paint(vtkContext2D* painter)
{
  // RGB color lookup table by path point code:
  double color[4][3];
  color[vtkPath::MOVE_TO][0] = 1.0;
  color[vtkPath::MOVE_TO][1] = 0.0;
  color[vtkPath::MOVE_TO][2] = 0.0;
  color[vtkPath::LINE_TO][0] = 0.0;
  color[vtkPath::LINE_TO][1] = 1.0;
  color[vtkPath::LINE_TO][2] = 0.0;
  color[vtkPath::CONIC_CURVE][0] = 0.0;
  color[vtkPath::CONIC_CURVE][1] = 0.0;
  color[vtkPath::CONIC_CURVE][2] = 1.0;
  color[vtkPath::CUBIC_CURVE][0] = 1.0;
  color[vtkPath::CUBIC_CURVE][1] = 0.0;
  color[vtkPath::CUBIC_CURVE][2] = 1.0;

  vtkPoints* points = this->Path->GetPoints();
  vtkIntArray* codes = this->Path->GetCodes();

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

  // scaling factor and offset to ensure that the points will fit the view:
  double scale = 5.16591;
  double offset = 20.0;

  // Draw the control points, colored by codes:
  double point[3];
  painter->GetPen()->SetWidth(2);
  for (vtkIdType i = 0; i < points->GetNumberOfPoints(); ++i)
  {
    points->GetPoint(i, point);
    int code = codes->GetValue(i);

    painter->GetPen()->SetColorF(color[code]);
    painter->DrawPoint(point[0] * scale + offset, point[1] * scale + offset);
  }

  return true;
}