Can't hide rulers from specific 3d Views (with python)

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1

I’m having trouble displaying an Annotation Ruler in only certain 3D views.

For example, when using the Dual 3D Layout, I quickly create both a Fiducial and Ruler. If I input the following up the python interactor, the Fiducial disappears from the second 3D view (as expected):

getNode('vtkMRMLMarkupsFiducialNode1').GetDisplayNode().AddViewNodeID('vtkMRMLViewNode1')

However, if I input the following for the AnnotationRulerNode, the ruler does not disappear from the second 3D View:

getNode('vtkMRMLAnnotationRulerNode1').GetDisplayNode().AddViewNodeID('vtkMRMLViewNode1')

The ruler node actually has 3 display nodes, so I tried it on all 3, but it still did not work:

getNode('vtkMRMLAnnotationRulerNode1').GetNthDisplayNode(0).AddViewNodeID('vtkMRMLViewNode1')
getNode('vtkMRMLAnnotationRulerNode1').GetNthDisplayNode(1).AddViewNodeID('vtkMRMLViewNode1')
getNode('vtkMRMLAnnotationRulerNode1').GetNthDisplayNode(2).AddViewNodeID('vtkMRMLViewNode1')

And finally, the ruler automatically appears under a hierarchy, so I also tried the following, but again without success:

getNode('vtkMRMLAnnotationHierarchyNode2').GetDisplayNode().AddViewNodeID('vtkMRMLViewNode1')
getNode('vtkMRMLAnnotationHierarchyNode1').GetDisplayNode().AddViewNodeID('vtkMRMLViewNode1')

I also removed the ruler from the hierarchy, and tried all of the above, but it did not work. Is there something I am missing, or is this a bug in Slicer?

Thanks,
Brian

2

You may try calling RemoveAllViewNodeIDs before adding node IDs.

Annotation rulers are being phased out. In recent Slicer Preview Releases you can use Markups lines instead.

3

Hi Brian,

I encountered the same case not long before. I did a silly way to go through all rulers and check their names to let decide show or hide:

  value = 0 # hide
  value = 1 # show
  for i in range(NumofRulers):
        nodeName = 'Line-Ruler_No'+str(i+1)  # ruler Node's name
        node = slicer.util.getNode(nodeName)
        if node:
             node.SetDisplayVisibility(value)

Hope it helps.

4

Thanks. I ended up using Markup Lines, and everything works as expected

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