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# Make changes to this file, not the c-wrappers that Pyrex generates.
include "_pyproj.pxi"
#cimport c_numpy
#c_numpy.import_array()
def set_datapath(datapath):
cdef char *searchpath
bytestr = _strencode(datapath)
searchpath = bytestr
pj_set_searchpath(1, &searchpath)
cdef class Proj:
cdef projPJ projpj
cdef public object proj_version
cdef char *pjinitstring
cdef public object srs
def __cinit__(self, projstring):
# setup proj initialization string.
self.srs = projstring
bytestr = _strencode(projstring)
self.pjinitstring = bytestr
# initialize projection
self.projpj = pj_init_plus(self.pjinitstring)
if pj_errno != 0:
raise RuntimeError(pj_strerrno(pj_errno))
self.proj_version = PJ_VERSION/100.
def __dealloc__(self):
"""destroy projection definition"""
pj_free(self.projpj)
def __reduce__(self):
"""special method that allows pyproj.Proj instance to be pickled"""
return (self.__class__,(self.srs,))
def _fwd(self, object lons, object lats, radians=False, errcheck=False):
"""
forward transformation - lons,lats to x,y (done in place).
if radians=True, lons/lats are radians instead of degrees.
if errcheck=True, an exception is raised if the forward transformation is invalid.
if errcheck=False and the forward transformation is invalid, no exception is
raised and 1.e30 is returned.
"""
cdef projUV projxyout, projlonlatin
cdef Py_ssize_t buflenx, bufleny, ndim, i
cdef double u, v
cdef double *lonsdata, *latsdata
cdef void *londata, *latdata
# if buffer api is supported, get pointer to data buffers.
if PyObject_AsWriteBuffer(lons, &londata, &buflenx) <> 0:
raise RuntimeError
if PyObject_AsWriteBuffer(lats, &latdata, &bufleny) <> 0:
raise RuntimeError
# process data in buffer
if buflenx != bufleny:
raise RuntimeError("Buffer lengths not the same")
ndim = buflenx//_doublesize
lonsdata = <double *>londata
latsdata = <double *>latdata
for i from 0 <= i < ndim:
# if inputs are nan's, return big number.
if lonsdata[i] != lonsdata[i] or latsdata[i] != latsdata[i]:
lonsdata[i]=1.e30; latsdata[i]=1.e30
if errcheck:
raise RuntimeError('projection undefined')
continue
if radians:
projlonlatin.u = lonsdata[i]
projlonlatin.v = latsdata[i]
else:
projlonlatin.u = _dg2rad*lonsdata[i]
projlonlatin.v = _dg2rad*latsdata[i]
projxyout = pj_fwd(projlonlatin,self.projpj)
if errcheck and pj_errno != 0:
raise RuntimeError(pj_strerrno(pj_errno))
# since HUGE_VAL can be 'inf',
# change it to a real (but very large) number.
# also check for NaNs.
if projxyout.u == HUGE_VAL or\
projxyout.u != projxyout.u:
if errcheck:
raise RuntimeError('projection undefined')
lonsdata[i] = 1.e30
else:
lonsdata[i] = projxyout.u
if projxyout.v == HUGE_VAL or\
projxyout.u != projxyout.u:
if errcheck:
raise RuntimeError('projection undefined')
latsdata[i] = 1.e30
else:
latsdata[i] = projxyout.v
def _inv(self, object x, object y, radians=False, errcheck=False):
"""
inverse transformation - x,y to lons,lats (done in place).
if radians=True, lons/lats are radians instead of degrees.
if errcheck=True, an exception is raised if the inverse transformation is invalid.
if errcheck=False and the inverse transformation is invalid, no exception is
raised and 1.e30 is returned.
"""
cdef projUV projxyin, projlonlatout
cdef Py_ssize_t buflenx, bufleny, ndim, i
cdef double u, v
cdef void *xdata, *ydata
cdef double *xdatab, *ydatab
# if buffer api is supported, get pointer to data buffers.
if PyObject_AsWriteBuffer(x, &xdata, &buflenx) <> 0:
raise RuntimeError
if PyObject_AsWriteBuffer(y, &ydata, &bufleny) <> 0:
raise RuntimeError
# process data in buffer
# (for numpy/regular python arrays).
if buflenx != bufleny:
raise RuntimeError("Buffer lengths not the same")
ndim = buflenx//_doublesize
xdatab = <double *>xdata
ydatab = <double *>ydata
for i from 0 <= i < ndim:
# if inputs are nan's, return big number.
if xdatab[i] != xdatab[i] or ydatab[i] != ydatab[i]:
xdatab[i]=1.e30; ydatab[i]=1.e30
if errcheck:
raise RuntimeError('projection undefined')
continue
projxyin.u = xdatab[i]
projxyin.v = ydatab[i]
projlonlatout = pj_inv(projxyin,self.projpj)
if errcheck and pj_errno != 0:
raise RuntimeError(pj_strerrno(pj_errno))
# since HUGE_VAL can be 'inf',
# change it to a real (but very large) number.
# also check for NaNs.
if projlonlatout.u == HUGE_VAL or \
projlonlatout.u != projlonlatout.u:
if errcheck:
raise RuntimeError('projection undefined')
xdatab[i] = 1.e30
elif radians:
xdatab[i] = projlonlatout.u
else:
xdatab[i] = _rad2dg*projlonlatout.u
if projlonlatout.v == HUGE_VAL or \
projlonlatout.v != projlonlatout.v:
if errcheck:
raise RuntimeError('projection undefined')
ydatab[i] = 1.e30
elif radians:
ydatab[i] = projlonlatout.v
else:
ydatab[i] = _rad2dg*projlonlatout.v
# def _fwdn(self, c_numpy.ndarray lonlat, radians=False, errcheck=False):
# """
#forward transformation - lons,lats to x,y (done in place).
#Uses ndarray of shape ...,2.
#if radians=True, lons/lats are radians instead of degrees.
#if errcheck=True, an exception is raised if the forward
# transformation is invalid.
#if errcheck=False and the forward transformation is
# invalid, no exception is
# raised and 1.e30 is returned.
# """
# cdef projUV projxyout, projlonlatin
# cdef projUV *llptr
# cdef Py_ssize_t npts, i
# npts = c_numpy.PyArray_SIZE(lonlat)//2
# llptr = <projUV *>lonlat.data
# for i from 0 <= i < npts:
# if radians:
# projlonlatin = llptr[i]
# else:
# projlonlatin.u = _dg2rad*llptr[i].u
# projlonlatin.v = _dg2rad*llptr[i].v
# projxyout = pj_fwd(projlonlatin,self.projpj)
# if errcheck and pj_errno != 0:
# raise RuntimeError(pj_strerrno(pj_errno))
# # since HUGE_VAL can be 'inf',
# # change it to a real (but very large) number.
# if projxyout.u == HUGE_VAL:
# llptr[i].u = 1.e30
# else:
# llptr[i].u = projxyout.u
# if projxyout.v == HUGE_VAL:
# llptr[i].u = 1.e30
# else:
# llptr[i].v = projxyout.v
# def _invn(self, c_numpy.ndarray xy, radians=False, errcheck=False):
# """
#inverse transformation - x,y to lons,lats (done in place).
#Uses ndarray of shape ...,2.
#if radians=True, lons/lats are radians instead of degrees.
#if errcheck=True, an exception is raised if the inverse transformation is invalid.
#if errcheck=False and the inverse transformation is invalid, no exception is
#raised and 1.e30 is returned.
# """
# cdef projUV projxyin, projlonlatout
# cdef projUV *llptr
# cdef Py_ssize_t npts, i
# npts = c_numpy.PyArray_SIZE(xy)//2
# llptr = <projUV *>xy.data
# for i from 0 <= i < npts:
# projxyin = llptr[i]
# projlonlatout = pj_inv(projxyin, self.projpj)
# if errcheck and pj_errno != 0:
# raise RuntimeError(pj_strerrno(pj_errno))
# # since HUGE_VAL can be 'inf',
# # change it to a real (but very large) number.
# if projlonlatout.u == HUGE_VAL:
# llptr[i].u = 1.e30
# elif radians:
# llptr[i].u = projlonlatout.u
# else:
# llptr[i].u = _rad2dg*projlonlatout.u
# if projlonlatout.v == HUGE_VAL:
# llptr[i].v = 1.e30
# elif radians:
# llptr[i].v = projlonlatout.v
# else:
# llptr[i].v = _rad2dg*projlonlatout.v
def is_latlong(self):
# returns True if projection in geographic (lon/lat) coordinates
cdef int i
i = pj_is_latlong(self.projpj)
if i:
return True
else:
return False
def is_geocent(self):
# returns True if projection in geocentric (x/y) coordinates
cdef int i
i = pj_is_geocent(self.projpj)
if i:
return True
else:
return False
def _transform(Proj p1, Proj p2, inx, iny, inz, radians):
# private function to call pj_transform
cdef void *xdata, *ydata, *zdata
cdef double *xx, *yy, *zz
cdef Py_ssize_t buflenx, bufleny, buflenz, npts, i
if PyObject_AsWriteBuffer(inx, &xdata, &buflenx) <> 0:
raise RuntimeError
if PyObject_AsWriteBuffer(iny, &ydata, &bufleny) <> 0:
raise RuntimeError
if inz is not None:
if PyObject_AsWriteBuffer(inz, &zdata, &buflenz) <> 0:
raise RuntimeError
else:
buflenz = bufleny
if not (buflenx == bufleny == buflenz):
raise RuntimeError('x,y and z must be same size')
xx = <double *>xdata
yy = <double *>ydata
if inz is not None:
zz = <double *>zdata
npts = buflenx/8
if not radians and p1.is_latlong():
for i from 0 <= i < npts:
xx[i] = xx[i]*_dg2rad
yy[i] = yy[i]*_dg2rad
if inz is not None:
ierr = pj_transform(p1.projpj, p2.projpj, npts, 0, xx, yy, zz)
else:
ierr = pj_transform(p1.projpj, p2.projpj, npts, 0, xx, yy, NULL)
if ierr != 0:
raise RuntimeError(pj_strerrno(ierr))
if not radians and p2.is_latlong():
for i from 0 <= i < npts:
xx[i] = xx[i]*_rad2dg
yy[i] = yy[i]*_rad2dg
cdef _strencode(pystr,encoding='ascii'):
# encode a string into bytes. If already bytes, do nothing.
try:
return pystr.encode(encoding)
except AttributeError:
return pystr # already bytes?
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