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#! /usr/bin/env python
# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
from __future__ import print_function
from astrometry.util.index import *
from astrometry.util.sip import *
from astrometry.util.starutil_numpy import *
from astrometry.util.fits import *
from astrometry.libkd.spherematch import match
from numpy import *
from optparse import OptionParser
import sys
def allcombinations(fronts, backs):
#print 'fronts', fronts, 'backs', backs
if len(fronts) == 0:
return fronts
if len(backs) == 0:
return fronts
newf = []
for f in fronts:
for b in backs[0]:
newf.append(f + [b])
if len(newf) == 0:
return []
return allcombinations(newf, backs[1:])
#return allcombinations([f + [backs[0]] for f in fronts],
# backs[1:])
def whynot(field, index, qidx, wcs):
# find index stars in the field.
(ra,dec) = wcs.get_radec_center()
rad = arcsec2deg(wcs.get_pixel_scale() * hypot(wcs.get_width(), wcs.get_height()))
(xyz, radec, starinds) = index_search_stars(index, ra, dec, rad)
print('xyz', xyz.shape)
print('radec', radec.shape)
print('starinds', starinds.shape)
istars = tabledata()
istars.xyz = xyz
istars.radec = radec
istars.starind = starinds
W,H = wcs.get_width(), wcs.get_height()
pix = array([wcs.radec2pixelxy(r, d) for (r,d) in radec])
print('pix', pix.shape)
# within image bounds
I = (pix[:,0] > 0) * (pix[:,0] < W) * (pix[:,1] > 0) * (pix[:,1] < H)
# find nearby pairs of stars...
nsigma = 3
pixeljitter = 1
sigma = hypot(index.index_jitter / wcs.get_pixel_scale(), pixeljitter)
rad = nsigma * sigma
fieldxy = vstack((field.x, field.y)).T
print('field', fieldxy.shape)
(cinds, cdists) = match(pix, fieldxy, rad)
print('matches:', cinds.shape)
#print cdists.shape
corrs = tabledata()
corrs.dist = cdists[:,0]
corrs.star = starinds[cinds[:,0]]
corrs.field = cinds[:,1]
allquads = []
# All quads built from stars in the field...
for starind in starinds[I]:
#print qidx, starind
quads = qidxfile_get_quad_list(qidxfile_addr(qidx), starind)
#print 'quads:', quads.shape
allquads.append(quads)
allquads = unique(hstack(allquads))
print('%i unique quads touch stars in the field' % len(allquads))
'''
"quads" object: all quads that touch index stars in this field.
.quad : (int) quad index
.stars : (DQ x int) star indices
.starsinfield: (DQ x bool) stars in field
'''
quads = tabledata()
quads.quad = allquads
qstars = quadfile_get_stars_for_quads(quadfile_addr(index), quads.quad)
print('stars in quads:', qstars.shape)
#print qstars
quads.stars = qstars
quads.starsinfield = array([[s in starinds[I] for s in q] for q in qstars])
#print quads.starsinfield
allin = quads.starsinfield.min(axis=1)
#print quads.allin
quads.allin = allin
quadsin = quads[allin]
print('%i quads use stars that are in the field' % (len(quadsin)))
print('stars:', starinds)
c_s2f = {}
for c in corrs: #i in range(len(corrs)):
#print 'corr', c
if not c.star in c_s2f:
c_s2f[c.star] = []
c_s2f[c.star].append(c.field)
#c_s2f[corrs.star[i]]
#print c_s2f
# [[[213], [35], [265], [63]], [[186]], [[]], [[11], [19]], ...]
# For each quad, for each star in the quad, the list of field stars corresponding.
fq = []
for q in quadsin.stars:
fq1 = []
for s in q:
if s in c_s2f:
fq1.append(c_s2f[s])
else:
fq1.append([])
fq.append(fq1)
#print fq
# For each quad, the list of sets of field stars corresponding.
# [[[213, 35, 265, 63]], [], [],
fq2 = []
for q in fq:
#print 'q:', q
#ac = allcombinations([q[0]], q[1:])
#ac = allcombinations([[]], q)
#print '--> ac:', ac
fq2.append(allcombinations([[]], q))
#print fq2
quadsin.fq2 = fq2
hasf = array([len(x) > 0 for x in quadsin.fq2])
#print 'hasf:', hasf
okquads = quadsin[hasf]
#forder = argsort([max(x) for x in okquads.fq2])
#okquads = okquads[forder]
print('ok quads:', len(okquads))
print('quad nums:', okquads.quad)
print('stars:', okquads.stars)
print('field stars:', okquads.fq2)
#qmatches = table_data()
#fqs = []
#qs = []
#for okq,fq in zip(okquads, okquads.fq2):
# fqs = fqs + fq
# qs.append(okq)
#qmatches.fieldquad = fqs
qmatches = []
for okq,fqs in zip(okquads, okquads.fq2):
for fq in fqs:
#print 'field stars', fq
#print 'quad:', okq.quad
qmatches.append((fq, okq))
forder = argsort([max(fq) for fq,okq in qmatches])
#print 'forder', forder
print()
print('Quads in the order they will be found')
for i in forder:
fq,okq = qmatches[i]
print()
print('object', max(fq))
print('field stars', fq)
print('quad:', okq.quad)
# Index stars, by sweep (or "r" mag)...
# --which quads are they part of
#skdt = starkd_addr(index)
istars.sweep = array([startree_get_sweep(index.starkd, si) for si in istars.starind])
mystars = istars[I]
order = argsort(mystars.sweep)
print()
print()
print('Index stars:', end=' ')
for ms in mystars[order]:
print()
print('Star', ms.starind, 'sweep', ms.sweep, 'radec', ms.radec)
print('Field star(s) nearby:', len(c_s2f.get(ms.starind, [])))
for c in corrs[corrs.star == ms.starind]:
print(' field star', c.field, 'dist', c.dist, 'pixels')
myquads = quads[array([(ms.starind in q.stars) for q in quads])]
print('In %i quads' % len(myquads))
for q in myquads:
print(' quad %i: %i stars in the field' % (q.quad, sum(q.starsinfield)))
if q.allin:
print(' stars:', q.stars)
print(' correspondences for stars:', [c_s2f.get(s, None) for s in q.stars])
if __name__ == '__main__':
parser = OptionParser(usage='%prog <field> <index> <qidx> <wcs>')
opt, args = parser.parse_args()
if len(args) != 4:
parser.print_help()
sys.exit(-1)
fieldfn = args[0]
indexfn = args[1]
qidxfn = args[2]
wcsfn = args[3]
log_init(3)
field = fits_table(fieldfn)
index = index_load(indexfn, 0, None)
qidx = qidxfile_open(qidxfn)
wcs = Sip(filename=wcsfn)
whynot(field, index, qidx, wcs)
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