change planarity to requires extra for pip installs

Author: tomvanmele

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * `compas_blender.artists.RobotModelArtist.collection` can be assigned as a Blender collection or a name.
 * Generalized the parameter `color` of `compas_blender.draw_texts` and various label drawing methods.
 * Changed `compas.IPY` to `compas.RHINO` in `orientation_rhino`.
+* Changed `planarity` to `requires_extra` for pip installations.
 
 ### Removed
 

requirements.txt

@@ -12,7 +12,6 @@ networkx
 numba
 numpy >= 1.15.4
 pillow
-planarity
 pycollada
 schema
 jsonschema

setup.py

@@ -66,7 +66,9 @@ def read(*names, **kwargs):
     zip_safe=False,
     install_requires=requirements,
     python_requires='>=2.7',
-    extras_require=optional_requirements,
+    extras_require={
+        'planarity': ['planarity'],
+    },
     entry_points={
         'console_scripts': [
             'compas_rpc=compas.rpc.__main__:main'

src/compas/datastructures/network/planarity.py

@@ -8,15 +8,15 @@
 
 from itertools import product
 
-import compas
+# import compas
 
 from compas.geometry import angle_vectors_xy
 from compas.geometry import is_intersection_segment_segment_xy
 from compas.geometry import is_ccw_xy
 from compas.geometry import subtract_vectors_xy
 
-if not compas.IPY:
-    import planarity
+# if not compas.IPY:
+#     import planarity
 
 
 __all__ = [
@@ -198,6 +198,12 @@ def network_is_planar(network):
     --------
     >>>
     """
+    try:
+        import planarity
+    except ImportError:
+        print("Planarity is not installed.")
+        raise
+
     return planarity.is_planar(list(network.edges()))