Method OnMouseMove

Interaction/Widgets/vtkLineWidget.cxx:824–876

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

//------------------------------------------------------------------------------
void vtkLineWidget::OnMouseMove()
{
  // See whether we're active
  if (this->State == vtkLineWidget::Outside || this->State == vtkLineWidget::Start)
  {
    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
  this->ComputeWorldToDisplay(
    this->LastPickPosition[0], this->LastPickPosition[1], this->LastPickPosition[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
  int forward = 0;
  if (this->State == vtkLineWidget::MovingHandle)
  {
    forward = this->ForwardEvent(vtkCommand::MouseMoveEvent);
  }
  else if (this->State == vtkLineWidget::MovingLine)
  {
    forward = this->ForwardEvent(vtkCommand::MouseMoveEvent);
  }
  else if (this->State == vtkLineWidget::Scaling)
  {
    this->Scale(prevPickPoint, pickPoint, X, Y);
  }

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

//------------------------------------------------------------------------------
void vtkLineWidget::Scale(double* p1, double* p2, int vtkNotUsed(X), int Y)