UpdateBot: Nightly -> 4.3

2013-09-05T03:32:08Z

Nightly -> 4.3

New page

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='''Developer FAQ: {{{1}}}'''=
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== How to systematically execute custom python code at startup ? ==

Each time Slicer starts, it will look up for a file named <code>.slicerrc.py</code> into your HOME folder.

See [[Documentation/{{documentation/version}}/FAQ/General#What_is_my_HOME_folder_.3F|What is my HOME folder ?]]

== How to save an image/volume using python ? ==

The module <code>slicer.util</code> provides methods allowing to save either a node or an entire scene:
* saveNode
* saveScene

For more details see:
* https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/util.py#L229-267
* https://github.com/Slicer/Slicer/blob/master/Base/Python/slicer/tests/test_slicer_util_save.py

== How to assign a volume to a Slice view ? ==

Assuming the <code>MRHead</code> sample data has been loaded, you could do the following:

<pre>
red_logic = slicer.app.layoutManager().sliceWidget("Red").sliceLogic()
red_cn = red_logic.GetSliceCompositeNode()
red_logic.GetSliceCompositeNode().SetBackgroundVolumeID(slicer.util.getNode('MRHead').GetID())
</pre>

Discussion: http://slicer-devel.65872.n3.nabble.com/Assign-volumes-to-views-tt4028694.html

== How to access vtkRenderer in Slicer 3D view ? ==

<pre>
renderer = slicer.app.layoutManager().threeDWidget(0).threeDView().renderWindow().GetRenderers().GetFirstRenderer()
</pre>

== Should I used 'old style' or 'new style' python classes in my scripted module ==

When python classes have no superclass specified they are 'old style' as described here [http://docs.python.org/2/reference/datamodel.html#new-style-and-classic-classes].

In general it doesn't matter for the classes in a scripted module, since they won't be subclassed either old or new style should be the same.

For other python code in slicer where you might be subclassing, it's better to use new style classes. See the class hierarchies in the [https://github.com/Slicer/Slicer/tree/master/Modules/Scripted/EditorLib EditorLib] and the [https://github.com/Slicer/Slicer/tree/master/Modules/Scripted/DICOM/DICOMLib DICOMLib] for examples.

== How to harden a transform ? ==

<pre>
>>> n = getNode('Bone')
>>> logic = slicer.vtkSlicerTransformLogic()
>>> logic.hardenTransform(n)
</pre>

Discussion: http://slicer-devel.65872.n3.nabble.com/Scripting-hardened-transforms-tt4029456.html

== Where can I find example scripts? ==

Have a look at [[Documentation/{{documentation/version}}/ScriptRepository]].

Documentation/4.3/Developers/FAQ/Python Scripting - Revision history

UpdateBot: Nightly -> 4.3