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Make pyhull an optional dependency #15

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Make pyhull an optional dependency #15

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9 changes: 8 additions & 1 deletion axi/paths.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,13 @@
from math import hypot
from pyhull.convex_hull import ConvexHull
from shapely import geometry

from .spatial import Index

try:
from pyhull.convex_hull import ConvexHull
except ImportError:
ConvexHull = None

def load_paths(filename):
paths = []
with open(filename) as fp:
Expand Down Expand Up @@ -121,6 +125,9 @@ def crop_paths(paths, x1, y1, x2, y2):
return result

def convex_hull(points):
if ConvexHull is None:
raise Exception('path.convex_hull() requires pyhull')

hull = ConvexHull(points)
vertices = set(i for v in hull.vertices for i in v)
return [hull.points[i] for i in vertices]
Expand Down