Method Paint

Charts/Core/vtkPlotParallelCoordinates.cxx:75–163

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkPlotParallelCoordinates::Paint(vtkContext2D* painter)
{
  // This is where everything should be drawn, or dispatched to other methods.
  vtkDebugMacro(<< "Paint event called in vtkPlotParallelCoordinates.");

  if (!this->Visible)
  {
    return false;
  }

  painter->ApplyPen(this->Pen);

  if (this->Storage->empty())
  {
    return false;
  }

  size_t cols = this->Storage->size();
  size_t rows = this->Storage->at(0).size();
  std::vector<vtkVector2f> line(cols);

  // Update the axis positions
  vtkChartParallelCoordinates* parent = vtkChartParallelCoordinates::SafeDownCast(this->Parent);

  for (size_t i = 0; i < cols; ++i)
  {
    this->Storage->AxisPos[i] =
      parent->GetAxis(int(i)) ? parent->GetAxis(int(i))->GetPoint1()[0] : 0;
  }

  vtkIdType selection = 0;
  vtkIdType id = 0;
  if (this->Selection)
  {
    vtkIdType selectionSize = this->Selection->GetNumberOfTuples();
    if (selectionSize)
    {
      this->Selection->GetTypedTuple(selection, &id);
    }
  }

  // Draw all of the lines
  painter->ApplyPen(this->Pen);
  int ncComps(0);
  if (this->ScalarVisibility && this->Colors)
  {
    ncComps = this->Colors->GetNumberOfComponents();
  }
  if (this->ScalarVisibility && this->Colors && ncComps == 4)
  {
    for (size_t i = 0, nc = 0; i < rows; ++i, nc += ncComps)
    {
      for (size_t j = 0; j < cols; ++j)
      {
        line[j].Set(this->Storage->AxisPos[j], (*this->Storage)[j][i]);
      }
      painter->GetPen()->SetColor(this->Colors->GetPointer(static_cast<vtkIdType>(nc)));
      painter->DrawPoly(line[0].GetData(), static_cast<int>(cols));