Method OnMouseMove

Interaction/Widgets/vtkPointWidget.cxx:446–512

}

void vtkPointWidget::OnMouseMove()
{
  // See whether we're active
  if (this->State == vtkPointWidget::Outside || this->State == vtkPointWidget::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
  if (this->State == vtkPointWidget::Moving)
  {
    if (!this->WaitingForMotion || this->WaitCount++ > 3)
    {
      this->ConstraintAxis = this->DetermineConstraintAxis(this->ConstraintAxis, pickPoint);
      this->MoveFocus(prevPickPoint, pickPoint);
    }
    else
    {
      return; // avoid the extra render
    }
  }

  else if (this->State == vtkPointWidget::Scaling)
  {
    this->Scale(prevPickPoint, pickPoint, X, Y);
  }

  else if (this->State == vtkPointWidget::Translating)
  {
    if (!this->WaitingForMotion || this->WaitCount++ > 3)
    {
      this->ConstraintAxis = this->DetermineConstraintAxis(this->ConstraintAxis, pickPoint);
      this->Translate(prevPickPoint, pickPoint);
    }
    else
    {