Method BuildRepresentation

Interaction/Widgets/vtkPolyLineRepresentation.cxx:44–83

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//------------------------------------------------------------------------------
void vtkPolyLineRepresentation::BuildRepresentation()
{
  this->ValidPick = 1;
  // TODO: Avoid unnecessary rebuilds.
  // Handles have changed position, re-compute the points
  vtkPoints* points = this->PolyLineSource->GetPoints();
  if (points->GetNumberOfPoints() != this->NumberOfHandles)
  {
    points->SetNumberOfPoints(this->NumberOfHandles);
  }

  vtkBoundingBox bbox;
  for (int i = 0; i < this->NumberOfHandles; ++i)
  {
    double pt[3];
    this->PointHandles[i]->GetPosition(pt);
    points->SetPoint(i, pt);
    bbox.AddPoint(pt);
  }
  this->PolyLineSource->SetClosed(this->Closed);
  this->PolyLineSource->Modified();
  points->Modified();

  // Update end arrow direction
  if (this->Directional && this->NumberOfHandles >= 2)
  {
    vtkVector3d pt1, pt2;
    this->PointHandles[this->NumberOfHandles - 1]->GetPosition(pt1.GetData());
    this->PointHandles[this->NumberOfHandles - 2]->GetPosition(pt2.GetData());
    pt1 = pt1 - pt2;
    this->PointHandles[this->NumberOfHandles - 1]->SetDirection(pt1.GetData());
  }

  double bounds[6];
  bbox.GetBounds(bounds);
  this->InitialLength = sqrt((bounds[1] - bounds[0]) * (bounds[1] - bounds[0]) +
    (bounds[3] - bounds[2]) * (bounds[3] - bounds[2]) +
    (bounds[5] - bounds[4]) * (bounds[5] - bounds[4]));
  this->SizeHandles();
}

//------------------------------------------------------------------------------
void vtkPolyLineRepresentation::SetNumberOfHandles(int npts)