qMRMLTransformSliders

Development
1

Hi all,
I have struggle with MRMLTransformSliders. since there are 3 sliders inside it, how we can access each slider’s value? Or if it is an attribute to extract transform matrix still is useful.
thanks

2

I guess I need to find them in findChildren attribute as:

import slicer
from qt import QSlider

# Create an instance of qMRMLTransformSliders
transformSliders = slicer.qMRMLTransformSliders()

# Find all sliders within the qMRMLTransformSliders widget
sliders = transformSliders.findChildren(QSlider)

# Access the translation sliders
translationSliders = sliders[0:3] # Assuming the translation sliders are the first three in the list

# Get the values of the translation sliders
lrTranslation = translationSliders[0].value()
paTranslation = translationSliders[1].value()
isTranslation = translationSliders[2].value()

3

I think it’s a better strategy to observe the transform node. Whenever there is a TransformModifiedEvent evoked by the transform node, you can take the transformation matrix (or vtkTransform) out of the transform node, and obtain the translation and rotation values using VTK.

1 Like
4

Thanks @ungi do you have any example for that?

5

You can find examples in the Slicer script repository for adding observers to nodes. In this case you need to observe the TransformModified event.

1 Like