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#
# RemoteImage.py -- Mixin for images that live on a remote server
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from ginga.AstroImage import AstroImage, AstroHeader
class RemoteImage(AstroImage):
def __init__(self, proxy, metadata=None, logger=None,
#wcsclass=wcsClass, ioclass=ioClass,
inherit_primary_header=False):
self._proxy = proxy
self._shape = tuple([])
self.id = None
AstroImage.__init__(self, data_np=None, metadata=metadata,
logger=logger, #wcsclass=wcsClass, ioclass=ioClass,
inherit_primary_header=inherit_primary_header)
self._data = None
@property
def shape(self):
return self._shape
def load_file(self, filepath, numhdu=None, naxispath=None):
self.id = filepath
shape, header = self._proxy.load_file(filepath, numhdu=numhdu,
naxispath=naxispath)
self._shape = shape
ahdr = { key: header[key]['value'] for key in header.keys() }
# this will set our local wcs
self.update_keywords(ahdr)
def _set_minmax(self, noinf=False):
self.minval, self.maxval = self._proxy.get_minmax(self.id, noinf=False)
(self.minval_noinf,
self.maxval_noinf) = self._proxy.get_minmax(self.id, noinf=True)
def _get_data(self):
if self._data is None:
self._data = self._proxy.get_data(self.id)
return self._data
def _slice(self, view):
"""
Send view to remote server and do slicing there.
"""
if self._data is not None:
return self._data[view]
return self._proxy.get_view(self.id, view)
def get_data_xy(self, x, y):
# TODO: cache some points for faster response?
return self._proxy.get_data_xy(self.id, x, y)
def get_pixels_on_line(self, x1, y1, x2, y2):
return self._proxy.get_pixels_on_line(self.id, x1, y1, x2, y2)
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