#
# Copyright (C) 2008, 2020, 2021, 2024
# Smithsonian Astrophysical Observatory
#
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
import logging
import numpy
from sherpa.utils import NoNewAttributesAfterInit
warning = logging.getLogger(__name__).warning
try:
from sherpa.astro.utils._wcs import pix2world, world2pix
except ImportError:
warning('WCS support is not available')
def pix2world(*args, **kwargs):
raise RuntimeError("No WCS support")
def world2pix(*args, **kwargs):
raise RuntimeError("No WCS support")
[docs]
class WCS(NoNewAttributesAfterInit):
def __init__(self, name, type, crval, crpix, cdelt,
crota=0.0, epoch=2000.0, equinox=2000.0):
self.name = name
self.type = type
self.crval = numpy.asarray(crval, dtype=float)
self.crpix = numpy.asarray(crpix, dtype=float)
self.cdelt = numpy.asarray(cdelt, dtype=float)
self.crota = crota
self.epoch = epoch
self.equinox = equinox
NoNewAttributesAfterInit.__init__(self)
def __repr__(self):
return ("<%s Coordinate instance '%s'>" %
(type(self).__name__, self.name))
def __str__(self):
val = [self.name,
' crval = %s' % numpy.array2string(self.crval, separator=',', precision=4, suppress_small=False),
' crpix = %s' % numpy.array2string(self.crpix, separator=',', precision=4, suppress_small=False),
' cdelt = %s' % numpy.array2string(self.cdelt, separator=',', precision=4, suppress_small=False)]
if self.type == 'WCS':
val.append(' crota = %g' % self.crota)
val.append(' epoch = %g' % self.epoch)
val.append(' equinox = %g' % self.equinox)
return '\n'.join(val)
[docs]
def apply(self, x0, x1):
x0, x1 = pix2world(self.type, x0, x1,
self.crpix, self.crval, self.cdelt,
self.crota, self.equinox, self.epoch)
return (x0, x1)
[docs]
def invert(self, x0, x1):
x0, x1 = world2pix(self.type, x0, x1,
self.crpix, self.crval, self.cdelt,
self.crota, self.equinox, self.epoch)
return (x0, x1)