# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
#
# Copyright(C) 2019 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
import numpy as np
from ..domain_tuple import DomainTuple
from ..domains.rg_space import RGSpace
from ..domains.unstructured_domain import UnstructuredDomain
from ..operators.linear_operator import LinearOperator
from ..sugar import from_global_data, makeDomain
class GridderMaker(object):
def __init__(self, dirty_domain, uv, eps=2e-13):
import nifty_gridder
dirty_domain = makeDomain(dirty_domain)
if (len(dirty_domain) != 1 or not isinstance(dirty_domain[0], RGSpace)
or not len(dirty_domain.shape) == 2):
raise ValueError("need dirty_domain with exactly one 2D RGSpace")
if uv.ndim != 2:
raise ValueError("uv must be a 2D array")
if uv.shape[1] != 2:
raise ValueError("second dimension of uv must have length 2")
dstx, dsty = dirty_domain[0].distances
# wasteful hack to adjust to shape required by nifty_gridder
uvw = np.empty((uv.shape[0], 3), dtype=np.float64)
uvw[:, 0:2] = uv
uvw[:, 2] = 0.
# Scale uv such that 0