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Fixing empty areas with low number of points #17

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Fixing empty areas with low number of points #17

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2b98c2c
Fixing empty areas with low number of points
davide-f Sep 17, 2021
a12bb4e
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davide-f Sep 17, 2021
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25 changes: 20 additions & 5 deletions vresutils/graph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -469,7 +469,8 @@ def get_voronoi_regions(G, outline=None):
G = voronoi_partition(G, Polygon(outline))
return list(get_node_attributes(G, 'region').values())

def voronoi_partition_pts(points, outline, no_multipolygons=False):
def voronoi_partition_pts(points, outline, no_multipolygons=False,
add_bounds_shape=True, multiplier=5):
"""
Compute the polygons of a voronoi partition of `points` within the
polygon `outline`
Expand All @@ -480,6 +481,12 @@ def voronoi_partition_pts(points, outline, no_multipolygons=False):
outline : Polygon
no_multipolygons : bool (default: False)
If true, replace each MultiPolygon by its largest component
add_bounds_shape : bool (default: True)
If true, the maximum size of the Voronoi cell is extended
to possibly match the outline shape
multiplier : float (default: 5)
default of the multiplier to choose the size of the Voronoi cell
with respect to the points and the polygon considered

Returns
-------
Expand All @@ -496,13 +503,21 @@ def voronoi_partition_pts(points, outline, no_multipolygons=False):
xspan = xmax - xmin
yspan = ymax - ymin

if add_bounds_shape:
# check bounds of the shape
minx_o, miny_o, maxx_o, maxy_o = outline.boundary.bounds
xmin = min(xmin, minx_o)
ymin = min(ymin, miny_o)
xmax = min(xmax, maxx_o)
ymax = min(ymax, maxy_o)

# to avoid any network positions outside all Voronoi cells, append
# the corners of a rectangle framing these points
vor = Voronoi(np.vstack((points,
[[xmin-3.*xspan, ymin-3.*yspan],
[xmin-3.*xspan, ymax+3.*yspan],
[xmax+3.*xspan, ymin-3.*yspan],
[xmax+3.*xspan, ymax+3.*yspan]])))
[[xmin-multiplier*xspan, ymin-multiplier*yspan],
[xmin-multiplier*xspan, ymax+multiplier*yspan],
[xmax+multiplier*xspan, ymin-multiplier*yspan],
[xmax+multiplier*xspan, ymax+multiplier*yspan]])))

polygons = []
for i in range(len(points)):
Expand Down