Method OnMouseMove

Interaction/Widgets/vtkSplineWidget.cxx:815–879

}

void vtkSplineWidget::OnMouseMove()
{
  // See whether we're active
  if (this->State == vtkSplineWidget::Outside || this->State == vtkSplineWidget::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, vpn[3];

  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
  if (this->State == vtkSplineWidget::Moving)
  {
    // Okay to process
    if (this->CurrentHandle)
    {
      this->MovePoint(prevPickPoint, pickPoint);
    }
    else // Must be moving the spline
    {
      this->Translate(prevPickPoint, pickPoint);
    }
  }
  else if (this->State == vtkSplineWidget::Scaling)
  {
    this->Scale(prevPickPoint, pickPoint, X, Y);
  }
  else if (this->State == vtkSplineWidget::Spinning)
  {
    camera->GetViewPlaneNormal(vpn);
    this->Spin(prevPickPoint, pickPoint, vpn);
  }

  if (this->ProjectToPlane)
  {
    this->ProjectPointsToPlane();
  }