In Slicer: vtkMRMLMarkupsNode Class Reference, I found out that there is no “vtkMRMLMarkupsRulerNode”, I want to add the effect of “Ruler”(Line with tick marks), how can I achieve it?

As far as I know there are no tick marks on the Markups lines like there were on Annotation rulers. It would be a nice feature for both straight lines and curves to have configurable tick marks at regular intervals in world space.