def geos_multipoint_from_py(ob):
if isinstance(ob, MultiPoint):
return geos_geom_from_py(ob)
m = len(ob)
try:
n = len(ob[0])
except TypeError:
n = ob[0]._ndim
assert n == 2 or n == 3
# Array of pointers to point geometries
subs = (c_void_p * m)()
# add to coordinate sequence
for i in range(m):
coords = ob[i]
geom, ndims = point.geos_point_from_py(coords)
if lgeos.GEOSisEmpty(geom):
raise EmptyPartError("Can't create MultiPoint with empty component")
subs[i] = cast(geom, c_void_p)
return lgeos.GEOSGeom_createCollection(4, subs, m), n
def geos_multilinestring_from_py(ob):
# ob must be either a MultiLineString, a sequence, or
# array of sequences or arrays
if isinstance(ob, MultiLineString):
return geos_geom_from_py(ob)
obs = getattr(ob, 'geoms', ob)
L = len(obs)
assert L >= 1
exemplar = obs[0]
try:
N = len(exemplar[0])
except TypeError:
N = exemplar._ndim
if N not in (2, 3):
raise ValueError("Invalid coordinate dimensionality")
# Array of pointers to point geometries
subs = (c_void_p * L)()
# add to coordinate sequence
for l in range(L):
geom, ndims = linestring.geos_linestring_from_py(obs[l])
if lgeos.GEOSisEmpty(geom):
raise EmptyPartError(
"Can't create MultiLineString with empty component")
subs[l] = cast(geom, c_void_p)
return (lgeos.GEOSGeom_createCollection(5, subs, L), N)
def __new__(self, points=None):
if points is None:
# allow creation of empty multipoints, to support unpickling
# TODO better empty constructor
return shapely.from_wkt("MULTIPOINT EMPTY")
elif isinstance(points, MultiPoint):
return points
m = len(points)
subs = []
for i in range(m):
p = point.Point(points[i])
if p.is_empty:
raise EmptyPartError(
"Can't create MultiPoint with empty component")
subs.append(p)
if len(points) == 0:
return shapely.from_wkt("MULTIPOINT EMPTY")
return shapely.multipoints(subs)
def __new__(self, points=None):
"""
Parameters
----------
points : sequence
A sequence of (x, y [,z]) numeric coordinate pairs or triples or a
sequence of objects that implement the numpy array interface,
including instances of Point.
Example
-------
Construct a 2 point collection
>>> from shapely.geometry import Point
>>> ob = MultiPoint([[0.0, 0.0], [1.0, 2.0]])
>>> len(ob.geoms)
2
>>> type(ob.geoms[0]) == Point
True
"""
if points is None:
# allow creation of empty multipoints, to support unpickling
# TODO better empty constructor
return shapely.from_wkt("MULTIPOINT EMPTY")
elif isinstance(points, MultiPoint):
return points
m = len(points)
subs = []
for i in range(m):
p = point.Point(points[i])
if p.is_empty:
raise EmptyPartError(
"Can't create MultiPoint with empty component")
subs.append(p)
if len(points) == 0:
return shapely.from_wkt("MULTIPOINT EMPTY")
return shapely.multipoints(subs)
def __new__(self, lines=None):
if not lines:
# allow creation of empty multilinestrings, to support unpickling
# TODO better empty constructor
return shapely.from_wkt("MULTILINESTRING EMPTY")
elif isinstance(lines, MultiLineString):
return lines
lines = getattr(lines, "geoms", lines)
m = len(lines)
subs = []
for i in range(m):
line = linestring.LineString(lines[i])
if line.is_empty:
raise EmptyPartError(
"Can't create MultiLineString with empty component")
subs.append(line)
if len(lines) == 0:
return shapely.from_wkt("MULTILINESTRING EMPTY")
return shapely.multilinestrings(subs)
def __new__(self, lines=None):
"""
Parameters
----------
lines : sequence
A sequence of line-like coordinate sequences or objects that
provide the numpy array interface, including instances of
LineString.
Example
-------
Construct a collection containing one line string.
>>> lines = MultiLineString( [[[0.0, 0.0], [1.0, 2.0]]] )
"""
if not lines:
# allow creation of empty multilinestrings, to support unpickling
# TODO better empty constructor
return shapely.from_wkt("MULTILINESTRING EMPTY")
elif isinstance(lines, MultiLineString):
return lines
lines = getattr(lines, "geoms", lines)
m = len(lines)
subs = []
for i in range(m):
line = linestring.LineString(lines[i])
if line.is_empty:
raise EmptyPartError(
"Can't create MultiLineString with empty component")
subs.append(line)
if len(lines) == 0:
return shapely.from_wkt("MULTILINESTRING EMPTY")
return shapely.multilinestrings(subs)
