scatt/scattnlay.pyx

#    Copyright (C) 2009-2017 Ovidio Pena <ovidio@bytesfall.com>
#    Copyright (C) 2013-2017 Konstantin Ladutenko <kostyfisik@gmail.com>
#
#    This file is part of python-scattnlay
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    The only additional remark is that we expect that all publications
#    describing work using this software, or all commercial products
#    using it, cite the following reference:
#    [1] O. Pena and U. Pal, "Scattering of electromagnetic radiation by
#        a multilayered sphere," Computer Physics Communications,
#        vol. 180, Nov. 2009, pp. 2348-2354.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

# distutils: language = c++
# distutils: sources = nmie.cc

from __future__ import division
import numpy as np
cimport numpy as np
from libcpp.vector cimport vector
from libcpp.vector cimport complex

cdef inline double *npy2c(np.ndarray a):
    assert a.dtype == np.float64

    if not (<object>a).flags["C_CONTIGUOUS"]: # Array is not contiguous, need to make contiguous copy
        a = a.copy('C')

    # Return data pointer
    return <double *>(a.data)

cdef extern from "py_nmie.h":
    cdef int ScattCoeffs(int L, int pl, vector[double] x, vector[complex] m, int nmax, double anr[], double ani[], double bnr[], double bni[])
    cdef int ExpansionCoeffs( int L,  int pl, vector[double] x,  vector[complex] m,
                     int nmax,
                    vector[vector[double] ]  alnr,
                    vector[vector[double] ]  alni,
                    vector[vector[double] ]  blnr,
                    vector[vector[double] ]  blni,
                    vector[vector[double] ]  clnr,
                    vector[vector[double] ]  clni,
                    vector[vector[double] ]  dlnr,
                    vector[vector[double] ]  dlni)
    # cdef int ExpansionCoeffs(int L, int pl, vector[double] x, vector[complex] m, int nmax, double alnr[], double alni[], double blnr[], double blni[], double clnr[], double clni[], double dlnr[], double dlni[])
    cdef int nMie(int L, int pl, vector[double] x, vector[complex] m, int nTheta, vector[double] Theta, int nmax, double *Qext, double *Qsca, double *Qabs, double *Qbk, double *Qpr, double *g, double *Albedo, double S1r[], double S1i[], double S2r[], double S2i[])
    cdef int nField(int L, int pl, vector[double] x, vector[complex] m, int nmax, int mode_n, int mode_type, int nCoords, vector[double] Xp, vector[double] Yp, vector[double] Zp, double Erx[], double Ery[], double Erz[], double Eix[], double Eiy[], double Eiz[], double Hrx[], double Hry[], double Hrz[], double Hix[], double Hiy[], double Hiz[])

def scattcoeffs(np.ndarray[np.float64_t, ndim = 2] x, np.ndarray[np.complex128_t, ndim = 2] m, np.int_t nmax, np.int_t pl = -1):
    cdef Py_ssize_t i

    cdef np.ndarray[np.int_t, ndim = 1] terms = np.zeros(x.shape[0], dtype = np.int)

    cdef np.ndarray[np.complex128_t, ndim = 2] an = np.zeros((x.shape[0], nmax), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 2] bn = np.zeros((x.shape[0], nmax), dtype = np.complex128)

    cdef np.ndarray[np.float64_t, ndim = 1] anr
    cdef np.ndarray[np.float64_t, ndim = 1] ani
    cdef np.ndarray[np.float64_t, ndim = 1] bnr
    cdef np.ndarray[np.float64_t, ndim = 1] bni

    for i in range(x.shape[0]):
        anr = np.zeros(nmax, dtype = np.float64)
        ani = np.zeros(nmax, dtype = np.float64)
        bnr = np.zeros(nmax, dtype = np.float64)
        bni = np.zeros(nmax, dtype = np.float64)

        terms[i] = ScattCoeffs(x.shape[1], pl, x[i].copy('C'), m[i].copy('C'), nmax, npy2c(anr), npy2c(ani), npy2c(bnr), npy2c(bni))

        an[i] = anr.copy('C') + 1.0j*ani.copy('C')
        bn[i] = bnr.copy('C') + 1.0j*bni.copy('C')

    return terms, an, bn

def expansioncoeffs(np.ndarray[np.float64_t, ndim = 2] x, np.ndarray[np.complex128_t, ndim = 2] m, np.int_t nmax, np.int_t pl = -1):
    cdef Py_ssize_t i
    cdef Py_ssize_t l

    cdef np.ndarray[np.int_t, ndim = 1] terms = np.zeros(x.shape[0], dtype = np.int)
    
    cdef np.ndarray[np.complex128_t, ndim = 3] aln = np.zeros((x.shape[0], x.shape[1]+1, nmax), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 3] bln = np.zeros((x.shape[0], x.shape[1]+1, nmax), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 3] cln = np.zeros((x.shape[0], x.shape[1]+1, nmax), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 3] dln = np.zeros((x.shape[0], x.shape[1]+1, nmax), dtype = np.complex128)

    cdef np.ndarray[np.float64_t, ndim = 2] alnr
    cdef np.ndarray[np.float64_t, ndim = 2] alni
    cdef np.ndarray[np.float64_t, ndim = 2] blnr
    cdef np.ndarray[np.float64_t, ndim = 2] blni
    cdef np.ndarray[np.float64_t, ndim = 2] clnr
    cdef np.ndarray[np.float64_t, ndim = 2] clni
    cdef np.ndarray[np.float64_t, ndim = 2] dlnr
    cdef np.ndarray[np.float64_t, ndim = 2] dlni

    for i in range(x.shape[0]):
        alnr = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        alni = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        blnr = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        blni = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        clnr = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        clni = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        dlnr = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)
        dlni = np.zeros((x.shape[1]+1,nmax), dtype = np.float64)

        terms[i] = ExpansionCoeffs(x.shape[1], pl, x[i].copy('C'), m[i].copy('C'), nmax, alnr, alni, blnr, blni, clnr, clni, dlnr, dlni)
        # terms[i] = ExpansionCoeffs(x.shape[1], pl, x[i].copy('C'), m[i].copy('C'), nmax, npy2c(alnr), npy2c(alni), npy2c(blnr), npy2c(blni), npy2c(clnr), npy2c(clni), npy2c(dlnr), npy2c(dlni))

        for l in range(x.shape[1]):
            aln[l][i] = alnr[l].copy('C') + 1.0j*alni[l].copy('C')
            bln[l][i] = blnr[l].copy('C') + 1.0j*blni[l].copy('C')

    return terms, aln, bln, cln, dln

def scattnlay(np.ndarray[np.float64_t, ndim = 2] x, np.ndarray[np.complex128_t, ndim = 2] m, np.ndarray[np.float64_t, ndim = 1] theta = np.zeros(0, dtype = np.float64), np.int_t nmax = -1, np.int_t pl = -1):
    cdef Py_ssize_t i

    cdef np.ndarray[np.int_t, ndim = 1] terms = np.zeros(x.shape[0], dtype = np.int)

    cdef np.ndarray[np.float64_t, ndim = 1] Qext = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] Qabs = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] Qsca = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] Qbk = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] Qpr = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] g = np.zeros(x.shape[0], dtype = np.float64)
    cdef np.ndarray[np.float64_t, ndim = 1] Albedo = np.zeros(x.shape[0], dtype = np.float64)

    cdef np.ndarray[np.complex128_t, ndim = 2] S1 = np.zeros((x.shape[0], theta.shape[0]), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 2] S2 = np.zeros((x.shape[0], theta.shape[0]), dtype = np.complex128)

    cdef np.ndarray[np.float64_t, ndim = 1] S1r
    cdef np.ndarray[np.float64_t, ndim = 1] S1i
    cdef np.ndarray[np.float64_t, ndim = 1] S2r
    cdef np.ndarray[np.float64_t, ndim = 1] S2i

    for i in range(x.shape[0]):
        S1r = np.zeros(theta.shape[0], dtype = np.float64)
        S1i = np.zeros(theta.shape[0], dtype = np.float64)
        S2r = np.zeros(theta.shape[0], dtype = np.float64)
        S2i = np.zeros(theta.shape[0], dtype = np.float64)

        terms[i] = nMie(x.shape[1], pl, x[i].copy('C'), m[i].copy('C'), theta.shape[0], theta.copy('C'), nmax, &Qext[i], &Qsca[i], &Qabs[i], &Qbk[i], &Qpr[i], &g[i], &Albedo[i], npy2c(S1r), npy2c(S1i), npy2c(S2r), npy2c(S2i))

        S1[i] = S1r.copy('C') + 1.0j*S1i.copy('C')
        S2[i] = S2r.copy('C') + 1.0j*S2i.copy('C')

    return terms, Qext, Qsca, Qabs, Qbk, Qpr, g, Albedo, S1, S2

def fieldnlay(np.ndarray[np.float64_t, ndim = 2] x, np.ndarray[np.complex128_t, ndim = 2] m, np.ndarray[np.float64_t, ndim = 2] coords, np.int_t nmax = -1, np.int_t mode_n = -1, np.int_t mode_type = -1, np.int_t pl = -1):
    cdef Py_ssize_t i

    cdef np.ndarray[np.int_t, ndim = 1] terms = np.zeros(x.shape[0], dtype = np.int)

    cdef np.ndarray[np.complex128_t, ndim = 3] E = np.zeros((x.shape[0], coords.shape[0], 3), dtype = np.complex128)
    cdef np.ndarray[np.complex128_t, ndim = 3] H = np.zeros((x.shape[0], coords.shape[0], 3), dtype = np.complex128)

    cdef np.ndarray[np.float64_t, ndim = 1] Erx
    cdef np.ndarray[np.float64_t, ndim = 1] Ery
    cdef np.ndarray[np.float64_t, ndim = 1] Erz
    cdef np.ndarray[np.float64_t, ndim = 1] Eix
    cdef np.ndarray[np.float64_t, ndim = 1] Eiy
    cdef np.ndarray[np.float64_t, ndim = 1] Eiz
    cdef np.ndarray[np.float64_t, ndim = 1] Hrx
    cdef np.ndarray[np.float64_t, ndim = 1] Hry
    cdef np.ndarray[np.float64_t, ndim = 1] Hrz
    cdef np.ndarray[np.float64_t, ndim = 1] Hix
    cdef np.ndarray[np.float64_t, ndim = 1] Hiy
    cdef np.ndarray[np.float64_t, ndim = 1] Hiz

    for i in range(x.shape[0]):
        Erx = np.zeros(coords.shape[0], dtype = np.float64)
        Ery = np.zeros(coords.shape[0], dtype = np.float64)
        Erz = np.zeros(coords.shape[0], dtype = np.float64)
        Eix = np.zeros(coords.shape[0], dtype = np.float64)
        Eiy = np.zeros(coords.shape[0], dtype = np.float64)
        Eiz = np.zeros(coords.shape[0], dtype = np.float64)
        Hrx = np.zeros(coords.shape[0], dtype = np.float64)
        Hry = np.zeros(coords.shape[0], dtype = np.float64)
        Hrz = np.zeros(coords.shape[0], dtype = np.float64)
        Hix = np.zeros(coords.shape[0], dtype = np.float64)
        Hiy = np.zeros(coords.shape[0], dtype = np.float64)
        Hiz = np.zeros(coords.shape[0], dtype = np.float64)

        terms[i] = nField(x.shape[1], pl, x[i].copy('C'), m[i].copy('C'), nmax, mode_n, mode_type, coords.shape[0], coords[:, 0].copy('C'), coords[:, 1].copy('C'), coords[:, 2].copy('C'), npy2c(Erx), npy2c(Ery), npy2c(Erz), npy2c(Eix), npy2c(Eiy), npy2c(Eiz), npy2c(Hrx), npy2c(Hry), npy2c(Hrz), npy2c(Hix), npy2c(Hiy), npy2c(Hiz))

        E[i] = np.vstack((Erx.copy('C') + 1.0j*Eix.copy('C'), Ery.copy('C') + 1.0j*Eiy.copy('C'), Erz.copy('C') + 1.0j*Eiz.copy('C'))).transpose()
        H[i] = np.vstack((Hrx.copy('C') + 1.0j*Hix.copy('C'), Hry.copy('C') + 1.0j*Hiy.copy('C'), Hrz.copy('C') + 1.0j*Hiz.copy('C'))).transpose()

    return terms, E, H