Merge pull request #486 from MarcCote/streamlines_tck

MRG: Support TCK streamlines file format

This PR adds support for MRtrix streamlines file to the Streamlines API (#391).

Eventually, in a future PR, I will add some functions that allows easy conversion between all different formats. For now, going from TRK to TCK is easy. See
https://gist.github.com/MarcCote/ea6842cc4c3950f7596fc3c8a0be0154

Converting from TCK to TRK requires additional information from a reference anatomy. See
https://gist.github.com/MarcCote/ebf0ae83a9202eb96d1dfbb949cd98af

Author: matthew-brett

.travis.yml

@@ -33,19 +33,19 @@ matrix:
     # Absolute minimum dependencies
     - python: 2.7
       env:
-        - DEPENDS="numpy==1.6.0" PYDICOM=0
+        - DEPENDS="numpy==1.7.1" PYDICOM=0
     # Absolute minimum dependencies plus oldest MPL
     # Check these against:
     # nibabel/info.py
     # doc/source/installation.rst
     # requirements.txt
     - python: 2.7
       env:
-        - DEPENDS="numpy==1.6.0 matplotlib==1.3.1" PYDICOM=0
+        - DEPENDS="numpy==1.7.1 matplotlib==1.3.1" PYDICOM=0
     # Minimum pydicom dependency
     - python: 2.7
       env:
-        - DEPENDS="numpy==1.6.0 pydicom==0.9.7 pillow==2.6"
+        - DEPENDS="numpy==1.7.1 pydicom==0.9.7 pillow==2.6"
     # test against numpy 1.7
     - python: 2.7
       env:

doc/source/installation.rst

@@ -87,7 +87,7 @@ Requirements
     .travis.yml
 
 *  Python_ 2.7, or >= 3.4
-*  NumPy_ 1.6 or greater
+*  NumPy_ 1.7 or greater
 *  Six_ 1.3 or greater
 *  SciPy_ (optional, for full SPM-ANALYZE support)
 *  PyDICOM_ 0.9.7 or greater (optional, for DICOM support)

nibabel/info.py

@@ -186,7 +186,7 @@ def cmp_pkg_version(version_str, pkg_version_str=__version__):
 # doc/source/installation.rst
 # requirements.txt
 # .travis.yml
-NUMPY_MIN_VERSION = '1.6.0'
+NUMPY_MIN_VERSION = '1.7.1'
 PYDICOM_MIN_VERSION = '0.9.7'
 SIX_MIN_VERSION = '1.3'
 

nibabel/streamlines/__init__.py

@@ -10,9 +10,12 @@
 from .tractogram_file import ExtensionWarning
 
 from .trk import TrkFile
+from .tck import TckFile
 
 # List of all supported formats
-FORMATS = {".trk": TrkFile}
+FORMATS = {".trk": TrkFile,
+           ".tck": TckFile
+           }
 
 
 def is_supported(fileobj):