Method SetNumberOfHandles

Interaction/Widgets/vtkSplineWidget.cxx:1158–1219

}

void vtkSplineWidget::SetNumberOfHandles(int npts)
{
  if (this->NumberOfHandles == npts)
  {
    return;
  }
  if (npts < 2)
  {
    vtkGenericWarningMacro(<< "vtkSplineWidget: minimum of 2 points required.");
    return;
  }

  double radius = this->HandleGeometry[0]->GetRadius();
  this->Initialize();

  this->NumberOfHandles = npts;

  // Create the handles
  this->Handle = new vtkActor*[this->NumberOfHandles];
  this->HandleGeometry = new vtkSphereSource*[this->NumberOfHandles];

  int i;
  double pt[3];
  double u[3];
  for (i = 0; i < this->NumberOfHandles; ++i)
  {
    this->HandleGeometry[i] = vtkSphereSource::New();
    this->HandleGeometry[i]->SetThetaResolution(16);
    this->HandleGeometry[i]->SetPhiResolution(8);
    vtkPolyDataMapper* handleMapper = vtkPolyDataMapper::New();
    handleMapper->SetInputConnection(this->HandleGeometry[i]->GetOutputPort());
    this->Handle[i] = vtkActor::New();
    this->Handle[i]->SetMapper(handleMapper);
    handleMapper->Delete();
    this->Handle[i]->SetProperty(this->HandleProperty);
    u[0] = i / (this->NumberOfHandles - 1.0);
    this->ParametricSpline->Evaluate(u, pt, nullptr);
    this->HandleGeometry[i]->SetCenter(pt);
    this->HandleGeometry[i]->SetRadius(radius);
    this->HandlePicker->AddPickList(this->Handle[i]);
  }

  this->BuildRepresentation();

  if (this->Interactor)
  {
    if (!this->CurrentRenderer)
    {
      this->SetCurrentRenderer(this->Interactor->FindPokedRenderer(
        this->Interactor->GetLastEventPosition()[0], this->Interactor->GetLastEventPosition()[1]));
    }
    if (this->CurrentRenderer != nullptr)
    {
      for (i = 0; i < this->NumberOfHandles; ++i)
      {
        this->CurrentRenderer->AddViewProp(this->Handle[i]);
      }
      this->SizeHandles();