1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
"""Multi-part collections of geometries."""
import shapely
from shapely.geometry.base import BaseGeometry, BaseMultipartGeometry
class GeometryCollection(BaseMultipartGeometry):
"""Collection of one or more geometries that can be of different types.
Parameters
----------
geoms : list
A list of shapely geometry instances, which may be of varying geometry
types.
Attributes
----------
geoms : sequence
A sequence of Shapely geometry instances
Examples
--------
Create a GeometryCollection with a Point and a LineString
>>> from shapely import GeometryCollection, LineString, Point
>>> p = Point(51, -1)
>>> l = LineString([(52, -1), (49, 2)])
>>> gc = GeometryCollection([p, l])
"""
__slots__ = []
def __new__(self, geoms=None):
"""Create a new GeometryCollection."""
if isinstance(geoms, BaseGeometry):
# TODO(shapely-2.0) do we actually want to split Multi-part geometries?
# this is needed for the split() tests
if hasattr(geoms, "geoms"):
geoms = geoms.geoms
else:
geoms = [geoms]
elif geoms is None or len(geoms) == 0:
# TODO better empty constructor
return shapely.from_wkt("GEOMETRYCOLLECTION EMPTY")
return shapely.geometrycollections(geoms)
@property
def __geo_interface__(self):
"""Return a GeoJSON-like mapping of the geometry collection."""
geometries = []
for geom in self.geoms:
geometries.append(geom.__geo_interface__)
return dict(type="GeometryCollection", geometries=geometries)
shapely.lib.registry[7] = GeometryCollection
|
