Method OnMouseMove

Interaction/Widgets/vtkSphereWidget.cxx:407–460

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//------------------------------------------------------------------------------
void vtkSphereWidget::OnMouseMove()
{
  // See whether we're active
  if (this->State == vtkSphereWidget::Outside || this->State == vtkSphereWidget::Start)
  {
    return;
  }

  if (!this->Interactor)
  {
    return;
  }

  int X = this->Interactor->GetEventPosition()[0];
  int Y = this->Interactor->GetEventPosition()[1];

  // Do different things depending on state
  // Calculations everybody does
  double focalPoint[4], pickPoint[4], prevPickPoint[4];
  double z;

  vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
  if (!camera)
  {
    return;
  }

  // Compute the two points defining the motion vector
  camera->GetFocalPoint(focalPoint);
  this->ComputeWorldToDisplay(focalPoint[0], focalPoint[1], focalPoint[2], focalPoint);
  z = focalPoint[2];
  this->ComputeDisplayToWorld(double(this->Interactor->GetLastEventPosition()[0]),
    double(this->Interactor->GetLastEventPosition()[1]), z, prevPickPoint);
  this->ComputeDisplayToWorld(double(X), double(Y), z, pickPoint);

  // Process the motion
  if (this->State == vtkSphereWidget::Moving)
  {
    this->Translate(prevPickPoint, pickPoint);
  }
  else if (this->State == vtkSphereWidget::Scaling)
  {
    this->ScaleSphere(prevPickPoint, pickPoint, X, Y);
  }
  else if (this->State == vtkSphereWidget::Positioning)
  {
    this->MoveHandle(prevPickPoint, pickPoint, X, Y);
  }

  // Interact, if desired
  this->EventCallbackCommand->SetAbortFlag(1);
  this->InvokeEvent(vtkCommand::InteractionEvent, nullptr);
  this->Interactor->Render();
}

//------------------------------------------------------------------------------
void vtkSphereWidget::OnLeftButtonUp()