def __init__(self, *args, **kwargs):
"""
Initializes on the given sequence -- may take lists, tuples, NumPy arrays
of X,Y pairs, or Point objects. If Point objects are used, ownership is
_not_ transferred to the LineString object.
Examples:
ls = LineString((1, 1), (2, 2))
ls = LineString([(1, 1), (2, 2)])
ls = LineString(array([(1, 1), (2, 2)]))
ls = LineString(Point(1, 1), Point(2, 2))
"""
# If only one argument provided, set the coords array appropriately
if len(args) == 1: coords = args[0]
else: coords = args
if isinstance(coords, (tuple, list)):
# Getting the number of coords and the number of dimensions -- which
# must stay the same, e.g., no LineString((1, 2), (1, 2, 3)).
ncoords = len(coords)
if coords: ndim = len(coords[0])
else: raise TypeError('Cannot initialize on empty sequence.')
self._checkdim(ndim)
# Incrementing through each of the coordinates and verifying
for i in xrange(1, ncoords):
if not isinstance(coords[i], (tuple, list, Point)):
raise TypeError('each coordinate should be a sequence (list or tuple)')
if len(coords[i]) != ndim: raise TypeError('Dimension mismatch.')
numpy_coords = False
elif numpy and isinstance(coords, numpy.ndarray):
shape = coords.shape # Using numpy's shape.
if len(shape) != 2: raise TypeError('Too many dimensions.')
self._checkdim(shape[1])
ncoords = shape[0]
ndim = shape[1]
numpy_coords = True
else:
raise TypeError('Invalid initialization input for LineStrings.')
# Creating a coordinate sequence object because it is easier to
# set the points using GEOSCoordSeq.__setitem__().
cs = GEOSCoordSeq(capi.create_cs(ncoords, ndim), z=bool(ndim==3))
for i in xrange(ncoords):
if numpy_coords: cs[i] = coords[i,:]
elif isinstance(coords[i], Point): cs[i] = coords[i].tuple
else: cs[i] = coords[i]
# If SRID was passed in with the keyword arguments
srid = kwargs.get('srid', None)
# Calling the base geometry initialization with the returned pointer
# from the function.
super(LineString, self).__init__(self._init_func(cs.ptr), srid=srid)
def _create_point(self, ndim, coords):
"""
Create a coordinate sequence, set X, Y, [Z], and create point
"""
if ndim < 2 or ndim > 3:
raise TypeError('Invalid point dimension: %s' % str(ndim))
cs = capi.create_cs(c_uint(1), c_uint(ndim))
i = iter(coords)
capi.cs_setx(cs, 0, i.next())
capi.cs_sety(cs, 0, i.next())
if ndim == 3: capi.cs_setz(cs, 0, i.next())
return capi.create_point(cs)
def _create_point(self, ndim, coords):
"""
Create a coordinate sequence, set X, Y, [Z], and create point
"""
if ndim < 2 or ndim > 3:
raise TypeError('Invalid point dimension: %s' % str(ndim))
cs = capi.create_cs(c_uint(1), c_uint(ndim))
i = iter(coords)
capi.cs_setx(cs, 0, i.next())
capi.cs_sety(cs, 0, i.next())
if ndim == 3: capi.cs_setz(cs, 0, i.next())
return capi.create_point(cs)
def _set_list(self, length, items):
ndim = self._cs.dims
hasz = self._cs.hasz # I don't understand why these are different
# create a new coordinate sequence and populate accordingly
cs = GEOSCoordSeq(capi.create_cs(length, ndim), z=hasz)
for i, c in enumerate(items):
cs[i] = c
ptr = self._init_func(cs.ptr)
if ptr:
capi.destroy_geom(self.ptr)
self.ptr = ptr
self._post_init(self.srid)
else:
# can this happen?
raise GEOSException('Geometry resulting from slice deletion was invalid.')
def _create_point(cls, ndim, coords):
"""
Create a coordinate sequence, set X, Y, [Z], and create point
"""
if not ndim:
return capi.create_point(None)
if ndim < 2 or ndim > 3:
raise TypeError("Invalid point dimension: %s" % ndim)
cs = capi.create_cs(c_uint(1), c_uint(ndim))
i = iter(coords)
capi.cs_setx(cs, 0, next(i))
capi.cs_sety(cs, 0, next(i))
if ndim == 3:
capi.cs_setz(cs, 0, next(i))
return capi.create_point(cs)
def __init__(self, *args, **kwargs):
"""
Initialize on the given sequence -- may take lists, tuples, NumPy arrays
of X,Y pairs, or Point objects. If Point objects are used, ownership is
_not_ transferred to the LineString object.
Examples:
ls = LineString((1, 1), (2, 2))
ls = LineString([(1, 1), (2, 2)])
ls = LineString(array([(1, 1), (2, 2)]))
ls = LineString(Point(1, 1), Point(2, 2))
"""
# If only one argument provided, set the coords array appropriately
if len(args) == 1:
coords = args[0]
else:
coords = args
if not (isinstance(coords, (tuple, list)) or numpy and isinstance(coords, numpy.ndarray)):
raise TypeError('Invalid initialization input for LineStrings.')
# If SRID was passed in with the keyword arguments
srid = kwargs.get('srid')
ncoords = len(coords)
if not ncoords:
super().__init__(self._init_func(None), srid=srid)
return
if ncoords < self._minlength:
raise ValueError(
'%s requires at least %d points, got %s.' % (
self.__class__.__name__,
self._minlength,
ncoords,
)
)
if isinstance(coords, (tuple, list)):
# Getting the number of coords and the number of dimensions -- which
# must stay the same, e.g., no LineString((1, 2), (1, 2, 3)).
ndim = None
# Incrementing through each of the coordinates and verifying
for coord in coords:
if not isinstance(coord, (tuple, list, Point)):
raise TypeError('Each coordinate should be a sequence (list or tuple)')
if ndim is None:
ndim = len(coord)
self._checkdim(ndim)
elif len(coord) != ndim:
raise TypeError('Dimension mismatch.')
numpy_coords = False
else:
shape = coords.shape # Using numpy's shape.
if len(shape) != 2:
raise TypeError('Too many dimensions.')
self._checkdim(shape[1])
ndim = shape[1]
numpy_coords = True
# Creating a coordinate sequence object because it is easier to
# set the points using its methods.
cs = GEOSCoordSeq(capi.create_cs(ncoords, ndim), z=bool(ndim == 3))
point_setter = cs._set_point_3d if ndim == 3 else cs._set_point_2d
for i in range(ncoords):
if numpy_coords:
point_coords = coords[i, :]
elif isinstance(coords[i], Point):
point_coords = coords[i].tuple
else:
point_coords = coords[i]
point_setter(i, point_coords)
# Calling the base geometry initialization with the returned pointer
# from the function.
super().__init__(self._init_func(cs.ptr), srid=srid)
def __init__(self, *args, **kwargs):
"""
Initializes on the given sequence -- may take lists, tuples, NumPy arrays
of X,Y pairs, or Point objects. If Point objects are used, ownership is
_not_ transferred to the LineString object.
Examples:
ls = LineString((1, 1), (2, 2))
ls = LineString([(1, 1), (2, 2)])
ls = LineString(array([(1, 1), (2, 2)]))
ls = LineString(Point(1, 1), Point(2, 2))
"""
# If only one argument provided, set the coords array appropriately
if len(args) == 1:
coords = args[0]
else:
coords = args
if isinstance(coords, (tuple, list)):
# Getting the number of coords and the number of dimensions -- which
# must stay the same, e.g., no LineString((1, 2), (1, 2, 3)).
ncoords = len(coords)
if coords:
ndim = len(coords[0])
else:
raise TypeError('Cannot initialize on empty sequence.')
self._checkdim(ndim)
# Incrementing through each of the coordinates and verifying
for i in range(1, ncoords):
if not isinstance(coords[i], (tuple, list, Point)):
raise TypeError(
'each coordinate should be a sequence (list or tuple)')
if len(coords[i]) != ndim:
raise TypeError('Dimension mismatch.')
numpy_coords = False
elif numpy and isinstance(coords, numpy.ndarray):
shape = coords.shape # Using numpy's shape.
if len(shape) != 2:
raise TypeError('Too many dimensions.')
self._checkdim(shape[1])
ncoords = shape[0]
ndim = shape[1]
numpy_coords = True
else:
raise TypeError('Invalid initialization input for LineStrings.')
# Creating a coordinate sequence object because it is easier to
# set the points using GEOSCoordSeq.__setitem__().
cs = GEOSCoordSeq(capi.create_cs(ncoords, ndim), z=bool(ndim == 3))
for i in range(ncoords):
if numpy_coords:
cs[i] = coords[i, :]
elif isinstance(coords[i], Point):
cs[i] = coords[i].tuple
else:
cs[i] = coords[i]
# If SRID was passed in with the keyword arguments
srid = kwargs.get('srid')
# Calling the base geometry initialization with the returned pointer
# from the function.
super(LineString, self).__init__(self._init_func(cs.ptr), srid=srid)
from ctypes import c_uint
self._checkdim(ndim)
elif len(coord) != ndim:
raise TypeError('Dimension mismatch.')
numpy_coords = False
else:
shape = coords.shape # Using numpy's shape.
if len(shape) != 2:
raise TypeError('Too many dimensions.')
self._checkdim(shape[1])
ndim = shape[1]
numpy_coords = True
# Creating a coordinate sequence object because it is easier to
<<<<<<< HEAD
# set the points using GEOSCoordSeq.__setitem__().
cs = GEOSCoordSeq(capi.create_cs(ncoords, ndim), z=bool(ndim == 3))
for i in range(ncoords):
if numpy_coords:
cs[i] = coords[i, :]
elif isinstance(coords[i], Point):
cs[i] = coords[i].tuple
else:
cs[i] = coords[i]
# Calling the base geometry initialization with the returned pointer
# from the function.
super(LineString, self).__init__(self._init_func(cs.ptr), srid=srid)
def __iter__(self):
"Allows iteration over this LineString."
from django.contrib.gis.geos import prototypes as capi
