Method DrawPolygon

Interaction/Style/vtkInteractorStyleDrawPolygon.cxx:166–193

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//------------------------------------------------------------------------------
void vtkInteractorStyleDrawPolygon::DrawPolygon()
{
  vtkNew<vtkUnsignedCharArray> tmpPixelArray;
  tmpPixelArray->DeepCopy(this->PixelArray);
  unsigned char* pixels = tmpPixelArray->GetPointer(0);
  const int* size = this->Interactor->GetRenderWindow()->GetSize();

  // draw each line segment
  for (vtkIdType i = 0; i < this->Internal->GetNumberOfPoints() - 1; i++)
  {
    const vtkVector2i& a = this->Internal->GetPoint(i);
    const vtkVector2i& b = this->Internal->GetPoint(i + 1);

    this->Internal->DrawPixels(a, b, pixels, size);
  }

  // draw a line from the end to the start
  if (this->Internal->GetNumberOfPoints() >= 3)
  {
    const vtkVector2i& start = this->Internal->GetPoint(0);
    const vtkVector2i& end = this->Internal->GetPoint(this->Internal->GetNumberOfPoints() - 1);

    this->Internal->DrawPixels(start, end, pixels, size);
  }

  this->Interactor->GetRenderWindow()->SetPixelData(0, 0, size[0] - 1, size[1] - 1, pixels, 0);
  this->Interactor->GetRenderWindow()->Frame();
}

//------------------------------------------------------------------------------
void vtkInteractorStyleDrawPolygon::PrintSelf(ostream& os, vtkIndent indent)