/usr/lib/python3/dist-packages/shapely/coords.py is in python3-shapely 1.6.4-1.
This file is owned by root:root, with mode 0o644.
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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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | """Coordinate sequence utilities
"""
import sys
from array import array
from ctypes import byref, c_double, c_uint
from shapely.geos import lgeos
from shapely.topology import Validating
if sys.version_info[0] < 3:
range = xrange
class CoordinateSequence(object):
"""
Iterative access to coordinate tuples from the parent geometry's coordinate
sequence.
Example:
>>> from shapely.wkt import loads
>>> g = loads('POINT (0.0 0.0)')
>>> list(g.coords)
[(0.0, 0.0)]
"""
# Attributes
# ----------
# _cseq : c_void_p
# Ctypes pointer to GEOS coordinate sequence
# _ndim : int
# Number of dimensions (2 or 3, generally)
# __p__ : object
# Parent (Shapely) geometry
_cseq = None
_ndim = None
__p__ = None
def __init__(self, parent):
self.__p__ = parent
def _update(self):
self._ndim = self.__p__._ndim
self._cseq = lgeos.GEOSGeom_getCoordSeq(self.__p__._geom)
def __len__(self):
self._update()
cs_len = c_uint(0)
lgeos.GEOSCoordSeq_getSize(self._cseq, byref(cs_len))
return cs_len.value
def __iter__(self):
self._update()
dx = c_double()
dy = c_double()
dz = c_double()
has_z = self._ndim == 3
for i in range(self.__len__()):
lgeos.GEOSCoordSeq_getX(self._cseq, i, byref(dx))
lgeos.GEOSCoordSeq_getY(self._cseq, i, byref(dy))
if has_z:
lgeos.GEOSCoordSeq_getZ(self._cseq, i, byref(dz))
yield (dx.value, dy.value, dz.value)
else:
yield (dx.value, dy.value)
def __getitem__(self, key):
self._update()
dx = c_double()
dy = c_double()
dz = c_double()
m = self.__len__()
has_z = self._ndim == 3
if isinstance(key, int):
if key + m < 0 or key >= m:
raise IndexError("index out of range")
if key < 0:
i = m + key
else:
i = key
lgeos.GEOSCoordSeq_getX(self._cseq, i, byref(dx))
lgeos.GEOSCoordSeq_getY(self._cseq, i, byref(dy))
if has_z:
lgeos.GEOSCoordSeq_getZ(self._cseq, i, byref(dz))
return (dx.value, dy.value, dz.value)
else:
return (dx.value, dy.value)
elif isinstance(key, slice):
res = []
start, stop, stride = key.indices(m)
for i in range(start, stop, stride):
lgeos.GEOSCoordSeq_getX(self._cseq, i, byref(dx))
lgeos.GEOSCoordSeq_getY(self._cseq, i, byref(dy))
if has_z:
lgeos.GEOSCoordSeq_getZ(self._cseq, i, byref(dz))
res.append((dx.value, dy.value, dz.value))
else:
res.append((dx.value, dy.value))
return res
else:
raise TypeError("key must be an index or slice")
@property
def ctypes(self):
self._update()
has_z = self._ndim == 3
n = self._ndim
m = self.__len__()
array_type = c_double * (m * n)
data = array_type()
temp = c_double()
for i in range(m):
lgeos.GEOSCoordSeq_getX(self._cseq, i, byref(temp))
data[n*i] = temp.value
lgeos.GEOSCoordSeq_getY(self._cseq, i, byref(temp))
data[n*i+1] = temp.value
if has_z:
lgeos.GEOSCoordSeq_getZ(self._cseq, i, byref(temp))
data[n*i+2] = temp.value
return data
def array_interface(self):
"""Provide the Numpy array protocol."""
if sys.byteorder == 'little':
typestr = '<f8'
elif sys.byteorder == 'big':
typestr = '>f8'
else:
raise ValueError(
"Unsupported byteorder: neither little nor big-endian")
ai = {
'version': 3,
'typestr': typestr,
'data': self.ctypes,
}
ai.update({'shape': (len(self), self._ndim)})
return ai
__array_interface__ = property(array_interface)
@property
def xy(self):
"""X and Y arrays"""
self._update()
m = self.__len__()
x = array('d')
y = array('d')
temp = c_double()
for i in range(m):
lgeos.GEOSCoordSeq_getX(self._cseq, i, byref(temp))
x.append(temp.value)
lgeos.GEOSCoordSeq_getY(self._cseq, i, byref(temp))
y.append(temp.value)
return x, y
class BoundsOp(Validating):
def __init__(self, *args):
pass
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)
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