def __setstate__(self, state):
"""WKB doesn't differentiate between LineString and LinearRing so we
need to move the coordinate sequence into the correct geometry type"""
super(LinearRing, self).__setstate__(state)
cs = lgeos.GEOSGeom_getCoordSeq(self.__geom__)
cs_clone = lgeos.GEOSCoordSeq_clone(cs)
lgeos.GEOSGeom_destroy(self.__geom__)
self.__geom__ = lgeos.GEOSGeom_createLinearRing(cs_clone)
def geos_geom_from_py(ob, create_func=None):
"""Helper function for geos_*_from_py functions in each geom type.
If a create_func is specified the coodinate sequence is cloned and a new
geometry is created with it, otherwise the geometry is cloned directly.
This behaviour is useful for converting between LineString and LinearRing
objects.
"""
if create_func is None:
geom = lgeos.GEOSGeom_clone(ob._geom)
else:
cs = lgeos.GEOSGeom_getCoordSeq(ob._geom)
cs = lgeos.GEOSCoordSeq_clone(cs)
geom = create_func(cs)
N = ob._ndim
return geom, N
def ctypes(self):
if not self._ctypes_data:
temp = c_double()
n = self._ndim
m = len(self.geoms)
array_type = c_double * (m * n)
data = array_type()
for i in range(m):
g = self.geoms[i]._geom
cs = lgeos.GEOSGeom_getCoordSeq(g)
lgeos.GEOSCoordSeq_getX(cs, 0, byref(temp))
data[n*i] = temp.value
lgeos.GEOSCoordSeq_getY(cs, 0, byref(temp))
data[n*i+1] = temp.value
if n == 3: # TODO: use hasz
lgeos.GEOSCoordSeq_getZ(cs, 0, byref(temp))
data[n*i+2] = temp.value
self._ctypes_data = data
return self._ctypes_data
def geos_point_from_py(ob, update_geom=None, update_ndim=0):
"""Create a GEOS geom from an object that is a Point, a coordinate sequence
or that provides the array interface.
Returns the GEOS geometry and the number of its dimensions.
"""
if isinstance(ob, Point):
return geos_geom_from_py(ob)
# Accept either (x, y) or [(x, y)]
if not hasattr(ob, '__getitem__'): # Iterators, e.g. Python 3 zip
ob = list(ob)
if isinstance(ob[0], tuple):
coords = ob[0]
else:
coords = ob
n = len(coords)
dx = c_double(coords[0])
dy = c_double(coords[1])
dz = None
if n == 3:
dz = c_double(coords[2])
if update_geom:
cs = lgeos.GEOSGeom_getCoordSeq(update_geom)
if n != update_ndim:
raise ValueError(
"Wrong coordinate dimensions; this geometry has dimensions: "
"%d" % update_ndim)
else:
cs = lgeos.GEOSCoordSeq_create(1, n)
# Because of a bug in the GEOS C API, always set X before Y
lgeos.GEOSCoordSeq_setX(cs, 0, dx)
lgeos.GEOSCoordSeq_setY(cs, 0, dy)
if n == 3:
lgeos.GEOSCoordSeq_setZ(cs, 0, dz)
if update_geom:
return None
else:
return lgeos.GEOSGeom_createPoint(cs), n
def __call__(self, this):
self._validate(this)
env = this.envelope
if env.geom_type == 'Point':
return env.bounds
cs = lgeos.GEOSGeom_getCoordSeq(env.exterior._geom)
cs_len = c_uint(0)
lgeos.GEOSCoordSeq_getSize(cs, byref(cs_len))
minx = 1.e+20
maxx = -1e+20
miny = 1.e+20
maxy = -1e+20
temp = c_double()
for i in range(cs_len.value):
lgeos.GEOSCoordSeq_getX(cs, i, byref(temp))
x = temp.value
if x < minx: minx = x
if x > maxx: maxx = x
lgeos.GEOSCoordSeq_getY(cs, i, byref(temp))
y = temp.value
if y < miny: miny = y
if y > maxy: maxy = y
return (minx, miny, maxx, maxy)
def _update(self):
self._ndim = self.__p__._ndim
self._cseq = lgeos.GEOSGeom_getCoordSeq(self.__p__._geom)
def geos_linearring_from_py(ob, update_geom=None, update_ndim=0):
# If a LinearRing is passed in, clone it and return
# If a LineString is passed in, clone the coord seq and return a
# LinearRing.
#
# NB: access to coordinates using the array protocol has been moved
# entirely to the speedups module.
if isinstance(ob, LineString):
if type(ob) == LinearRing:
return geos_geom_from_py(ob)
elif ob.is_closed and len(ob.coords) >= 4:
return geos_geom_from_py(ob, lgeos.GEOSGeom_createLinearRing)
else:
ob = list(ob.coords)
try:
m = len(ob)
except TypeError: # Iterators, e.g. Python 3 zip
ob = list(ob)
m = len(ob)
if m == 0:
return None
n = len(ob[0])
if m < 3:
raise ValueError("A LinearRing must have at least 3 coordinate tuples")
assert (n == 2 or n == 3)
# Add closing coordinates if not provided
if m == 3 or ob[0][0] != ob[-1][0] or ob[0][1] != ob[-1][1]:
M = m + 1
else:
M = m
# Create a coordinate sequence
if update_geom is not None:
if n != update_ndim:
raise ValueError(
"Coordinate dimensions mismatch: target geom has {} dims, "
"update geom has {} dims".format(n, update_ndim))
cs = lgeos.GEOSGeom_getCoordSeq(update_geom)
else:
cs = lgeos.GEOSCoordSeq_create(M, n)
# add to coordinate sequence
for i in range(m):
coords = ob[i]
# Because of a bug in the GEOS C API,
# always set X before Y
lgeos.GEOSCoordSeq_setX(cs, i, coords[0])
lgeos.GEOSCoordSeq_setY(cs, i, coords[1])
if n == 3:
try:
lgeos.GEOSCoordSeq_setZ(cs, i, coords[2])
except IndexError:
raise ValueError("Inconsistent coordinate dimensionality")
# Add closing coordinates to sequence?
if M > m:
coords = ob[0]
# Because of a bug in the GEOS C API,
# always set X before Y
lgeos.GEOSCoordSeq_setX(cs, M - 1, coords[0])
lgeos.GEOSCoordSeq_setY(cs, M - 1, coords[1])
if n == 3:
lgeos.GEOSCoordSeq_setZ(cs, M - 1, coords[2])
if update_geom is not None:
return None
else:
return lgeos.GEOSGeom_createLinearRing(cs), n
def geos_linestring_from_py(ob, update_geom=None, update_ndim=0):
# If a LineString is passed in, clone it and return
# If a LinearRing is passed in, clone the coord seq and return a
# LineString.
#
# NB: access to coordinates using the array protocol has been moved
# entirely to the speedups module.
if isinstance(ob, LineString):
if type(ob) == LineString:
return geos_geom_from_py(ob)
else:
return geos_geom_from_py(ob, lgeos.GEOSGeom_createLineString)
try:
m = len(ob)
except TypeError: # Iterators, e.g. Python 3 zip
ob = list(ob)
m = len(ob)
if m == 0:
return None
elif m == 1:
raise ValueError("LineStrings must have at least 2 coordinate tuples")
if m < 2:
raise ValueError("LineStrings must have at least 2 coordinate tuples")
def _coords(o):
if isinstance(o, Point):
return o.coords[0]
else:
return o
try:
n = len(_coords(ob[0]))
except TypeError:
raise ValueError("Input %s is the wrong shape for a LineString" %
str(ob))
assert n == 2 or n == 3
# Create a coordinate sequence
if update_geom is not None:
cs = lgeos.GEOSGeom_getCoordSeq(update_geom)
if n != update_ndim:
raise ValueError("Wrong coordinate dimensions; this geometry has "
"dimensions: %d" % update_ndim)
else:
cs = lgeos.GEOSCoordSeq_create(m, n)
# add to coordinate sequence
for i in range(m):
coords = _coords(ob[i])
# Because of a bug in the GEOS C API,
# always set X before Y
lgeos.GEOSCoordSeq_setX(cs, i, coords[0])
lgeos.GEOSCoordSeq_setY(cs, i, coords[1])
if n == 3:
try:
lgeos.GEOSCoordSeq_setZ(cs, i, coords[2])
except IndexError:
raise ValueError("Inconsistent coordinate dimensionality")
if update_geom is not None:
return None
else:
ptr = lgeos.GEOSGeom_createLineString(cs)
if not ptr:
raise ValueError(
"GEOSGeom_createLineString returned a NULL pointer")
return ptr, n
