[Insight-developers] Copying the state of the TimeVaryingVelocityFieldTransform

[Williams, Norman K]

I've been working on a patch to allow Transforms to be copied.  This
addresses a gap in the API for transforms: If you read a transform file,
you only have read-only access to the transforms.  You can manually copy
parameters from the const Transform to a newly instantiated transform of
the same type, but this raises two problems:

1. Transform state does not exist solely in the Parameters &
FixedParameters, for several types of Transform.  If you need to make a
copy you need to know how the internal state has been augmented with 'out
of band' parameters.

2. To copy a CompositeTransform, it would need to copy all its constituent
transforms.

Adding a Clone method gives us a way to copy transforms in a single
method, and the transforms themselves are responsible for overriding Clone
to make sure the entire state is transformed.

The TimeVaryingVelocityFieldTransform is the one case where I am not sure
about how to copy the internal state. It is a subclass of
DisplacementField, but it has an additional Image-like member, the
TimeVaryingVelocityField. Plus it also has an interpolator member. Do
these all need to be copied?
--
Kent Williams norman-k-williams at uiowa.edu






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