NF added class to save streamlines in vtk format

[Jan-Schreiber]

This is a class that provides to save streamlines (as generated e.g. with eudx) in the vtk file format.
Some features are:

• setting an affine transform to save the streamlines in the
  data's coordinate system (rather than voxel coordinates)
• writing in ascii or binary file format
• saving colored streamlines for the local or global direction of the streamline
• decorating the streamlines with one value for every streamline (e.g. the streamline's length)
• decorating the streamline with a value for every vertex (e.g. the FA values)
• colors and decorations can be viewed e.g. with paraview (http://www.paraview.org/)
• errors are indicated by return code, no exceptions are thrown (or should I use exceptions?)

I am relatively new to python. So this is my initial project for dipy and a thorough review might be required.

[MarcCote]

I think streamlines related stuff should in the library NiBabel. More precisely. it could be part of this PR NiBabel - Streamlines API which tries to provide an uniform interface to all streamlines formats (TRK, VTK, TCK, ...).

[Garyfallidis]

@Jan-Schreiber thank you for this PR! Yes, we make strong effort that all file formats go to nibabel and all dMRI processing goes to dipy. Please coordinate with @MarcCote who has also made readers for VTK (but also TRK and TCK files) and see which problems you have probably solved that Marc hasn't done already. @matthew-brett is the lead developer of nibabel. I am sure he will be more than happy to help you on this. But first coordinate with Marc-Alex please. Thx Jan!!! :)

[Garyfallidis]

Guys, is it okay if I close this PR here. As this need to go to nibabel?

[Jan-Schreiber]

Ok for me.
I'll check nibabel

On 10/01/2014 08:17 PM, Eleftherios Garyfallidis wrote:

Guys, is it okay if I close this PR here. As this need to go to nibabel?

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[Garyfallidis]

Thank you @Jan-Schreiber . I will close this PR now. Let us know if you have dMRI processing code that you would like to share with the community in the future. Cheers!