198 lines
6.3 KiB
Python
198 lines
6.3 KiB
Python
"""
|
|
This module houses the GEOSCoordSeq object, which is used internally
|
|
by GEOSGeometry to house the actual coordinates of the Point,
|
|
LineString, and LinearRing geometries.
|
|
"""
|
|
from ctypes import byref, c_double, c_uint
|
|
|
|
from django.contrib.gis.geos import prototypes as capi
|
|
from django.contrib.gis.geos.base import GEOSBase
|
|
from django.contrib.gis.geos.error import GEOSException
|
|
from django.contrib.gis.geos.libgeos import CS_PTR
|
|
from django.contrib.gis.shortcuts import numpy
|
|
|
|
|
|
class GEOSCoordSeq(GEOSBase):
|
|
"The internal representation of a list of coordinates inside a Geometry."
|
|
|
|
ptr_type = CS_PTR
|
|
|
|
def __init__(self, ptr, z=False):
|
|
"Initialize from a GEOS pointer."
|
|
if not isinstance(ptr, CS_PTR):
|
|
raise TypeError('Coordinate sequence should initialize with a CS_PTR.')
|
|
self._ptr = ptr
|
|
self._z = z
|
|
|
|
def __iter__(self):
|
|
"Iterate over each point in the coordinate sequence."
|
|
for i in range(self.size):
|
|
yield self[i]
|
|
|
|
def __len__(self):
|
|
"Return the number of points in the coordinate sequence."
|
|
return int(self.size)
|
|
|
|
def __str__(self):
|
|
"Return the string representation of the coordinate sequence."
|
|
return str(self.tuple)
|
|
|
|
def __getitem__(self, index):
|
|
"Return the coordinate sequence value at the given index."
|
|
self._checkindex(index)
|
|
return self._point_getter(index)
|
|
|
|
def __setitem__(self, index, value):
|
|
"Set the coordinate sequence value at the given index."
|
|
# Checking the input value
|
|
if isinstance(value, (list, tuple)):
|
|
pass
|
|
elif numpy and isinstance(value, numpy.ndarray):
|
|
pass
|
|
else:
|
|
raise TypeError('Must set coordinate with a sequence (list, tuple, or numpy array).')
|
|
# Checking the dims of the input
|
|
if self.dims == 3 and self._z:
|
|
n_args = 3
|
|
point_setter = self._set_point_3d
|
|
else:
|
|
n_args = 2
|
|
point_setter = self._set_point_2d
|
|
if len(value) != n_args:
|
|
raise TypeError('Dimension of value does not match.')
|
|
self._checkindex(index)
|
|
point_setter(index, value)
|
|
|
|
# #### Internal Routines ####
|
|
def _checkindex(self, index):
|
|
"Check the given index."
|
|
sz = self.size
|
|
if (sz < 1) or (index < 0) or (index >= sz):
|
|
raise IndexError('invalid GEOS Geometry index: %s' % index)
|
|
|
|
def _checkdim(self, dim):
|
|
"Check the given dimension."
|
|
if dim < 0 or dim > 2:
|
|
raise GEOSException('invalid ordinate dimension "%d"' % dim)
|
|
|
|
def _get_x(self, index):
|
|
return capi.cs_getx(self.ptr, index, byref(c_double()))
|
|
|
|
def _get_y(self, index):
|
|
return capi.cs_gety(self.ptr, index, byref(c_double()))
|
|
|
|
def _get_z(self, index):
|
|
return capi.cs_getz(self.ptr, index, byref(c_double()))
|
|
|
|
def _set_x(self, index, value):
|
|
capi.cs_setx(self.ptr, index, value)
|
|
|
|
def _set_y(self, index, value):
|
|
capi.cs_sety(self.ptr, index, value)
|
|
|
|
def _set_z(self, index, value):
|
|
capi.cs_setz(self.ptr, index, value)
|
|
|
|
@property
|
|
def _point_getter(self):
|
|
return self._get_point_3d if self.dims == 3 and self._z else self._get_point_2d
|
|
|
|
def _get_point_2d(self, index):
|
|
return (self._get_x(index), self._get_y(index))
|
|
|
|
def _get_point_3d(self, index):
|
|
return (self._get_x(index), self._get_y(index), self._get_z(index))
|
|
|
|
def _set_point_2d(self, index, value):
|
|
x, y = value
|
|
self._set_x(index, x)
|
|
self._set_y(index, y)
|
|
|
|
def _set_point_3d(self, index, value):
|
|
x, y, z = value
|
|
self._set_x(index, x)
|
|
self._set_y(index, y)
|
|
self._set_z(index, z)
|
|
|
|
# #### Ordinate getting and setting routines ####
|
|
def getOrdinate(self, dimension, index):
|
|
"Return the value for the given dimension and index."
|
|
self._checkindex(index)
|
|
self._checkdim(dimension)
|
|
return capi.cs_getordinate(self.ptr, index, dimension, byref(c_double()))
|
|
|
|
def setOrdinate(self, dimension, index, value):
|
|
"Set the value for the given dimension and index."
|
|
self._checkindex(index)
|
|
self._checkdim(dimension)
|
|
capi.cs_setordinate(self.ptr, index, dimension, value)
|
|
|
|
def getX(self, index):
|
|
"Get the X value at the index."
|
|
return self.getOrdinate(0, index)
|
|
|
|
def setX(self, index, value):
|
|
"Set X with the value at the given index."
|
|
self.setOrdinate(0, index, value)
|
|
|
|
def getY(self, index):
|
|
"Get the Y value at the given index."
|
|
return self.getOrdinate(1, index)
|
|
|
|
def setY(self, index, value):
|
|
"Set Y with the value at the given index."
|
|
self.setOrdinate(1, index, value)
|
|
|
|
def getZ(self, index):
|
|
"Get Z with the value at the given index."
|
|
return self.getOrdinate(2, index)
|
|
|
|
def setZ(self, index, value):
|
|
"Set Z with the value at the given index."
|
|
self.setOrdinate(2, index, value)
|
|
|
|
# ### Dimensions ###
|
|
@property
|
|
def size(self):
|
|
"Return the size of this coordinate sequence."
|
|
return capi.cs_getsize(self.ptr, byref(c_uint()))
|
|
|
|
@property
|
|
def dims(self):
|
|
"Return the dimensions of this coordinate sequence."
|
|
return capi.cs_getdims(self.ptr, byref(c_uint()))
|
|
|
|
@property
|
|
def hasz(self):
|
|
"""
|
|
Return whether this coordinate sequence is 3D. This property value is
|
|
inherited from the parent Geometry.
|
|
"""
|
|
return self._z
|
|
|
|
# ### Other Methods ###
|
|
def clone(self):
|
|
"Clone this coordinate sequence."
|
|
return GEOSCoordSeq(capi.cs_clone(self.ptr), self.hasz)
|
|
|
|
@property
|
|
def kml(self):
|
|
"Return the KML representation for the coordinates."
|
|
# Getting the substitution string depending on whether the coordinates have
|
|
# a Z dimension.
|
|
if self.hasz:
|
|
substr = '%s,%s,%s '
|
|
else:
|
|
substr = '%s,%s,0 '
|
|
return '<coordinates>%s</coordinates>' % \
|
|
''.join(substr % self[i] for i in range(len(self))).strip()
|
|
|
|
@property
|
|
def tuple(self):
|
|
"Return a tuple version of this coordinate sequence."
|
|
n = self.size
|
|
get_point = self._point_getter
|
|
if n == 1:
|
|
return get_point(0)
|
|
return tuple(get_point(i) for i in range(n))
|