/usr/lib/python2.7/dist-packages/pyraf/irafgwcs.py is in python-pyraf 2.1.14+dfsg-6.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 | """irafgwcs.py: WCS handling for graphics
This contains some peculiar code to work around bugs in splot (and
possibly other tasks) where the WCS for an existing plot gets changed
before the plot is cleared. I save the changed wcs in self.pending and
only commit the change when it appears to really be applicable.
$Id$
"""
from __future__ import division # confidence high
import struct, numpy, math
from stsci.tools.for2to3 import ndarr2bytes, tobytes, BNULLSTR, PY3K
from stsci.tools.irafglobals import IrafError
import irafinst
# global vars
_IRAF64BIT = False
_WCS_RECORD_SIZE = 0
# constants
WCS_SLOTS = 16
WCSRCSZ_vOLD_32BIT = 22
WCSRCSZ_v215_32BIT = 24
WCSRCSZ_v215_64BIT = 48
LINEAR = 0
LOG = 1
ELOG = 2
DEFINED = 1
CLIP = 2 # needed for this?
NEWFORMAT = 4
def init_wcs_sizes(forceResetTo=None):
""" Make sure global size var has been defined correctly """
global _WCS_RECORD_SIZE, _IRAF64BIT
# _WCS_RECORD_SIZE is 24 in v2.15, but was 22 in prior versions.
# It counts in 2 byte integers, ie. it was 11 shorts when it was size=22.
# Either way however, there are still only 11 pieces of information - in
# the case of size=24, it is padded by/in IRAF.
# The 64-bit case uses a size of 48.
#
# This function HAS TO BE FAST. It is called multiple times during a
# single plot. Do not check IRAF version unless absolutely necessary.
#
# See ticket #156 and http://iraf.net/phpBB2/viewtopic.php?p=1466296
if _WCS_RECORD_SIZE != 0 and forceResetTo == None:
return # been here already
# Given a value for _WCS_RECORD_SIZE ?
if forceResetTo:
if not forceResetTo in \
(WCSRCSZ_vOLD_32BIT, WCSRCSZ_v215_32BIT, WCSRCSZ_v215_64BIT):
raise IrafError("Unexpected value for wcs record size: "+\
str(forceResetTo))
_WCS_RECORD_SIZE = forceResetTo
_IRAF64BIT = _WCS_RECORD_SIZE == WCSRCSZ_v215_64BIT
return
# Define _WCS_RECORD_SIZE, based on IRAF ver - assume 32-bit for now
vertup = irafinst.getIrafVerTup()
_WCS_RECORD_SIZE = WCSRCSZ_vOLD_32BIT
if vertup[0] > 2 or vertup[1] > 14:
_WCS_RECORD_SIZE = WCSRCSZ_v215_32BIT
def elog(x):
"""Extended range log scale. Handles negative and positive values.
values between 10 and -10 are linearly scaled, values outside are
log scaled (with appropriate sign changes.
"""
if x > 10:
return math.log10(float(x))
elif x > -10.:
return x/10.
else:
return -math.log10(-float(x))
class IrafGWcs:
"""Class to handle the IRAF Graphics World Coordinate System
Structure"""
def __init__(self, arg=None):
self.wcs = None
self.pending = None
self.set(arg)
def commit(self):
if self.pending:
self.wcs = self.pending
self.pending = None
def clearPending(self):
self.pending = None
def __nonzero__(self):
self.commit()
return self.wcs is not None
def set(self, arg=None):
"""Set wcs from metacode stream"""
init_wcs_sizes()
if arg is None:
# commit immediately if arg=None
self.wcs = _setWCSDefault()
self.pending = None
# print "Default WCS set for plotting window."
return
# Even in v2.14, arg[] elements are of type int64, but here we cast to
# int16 and assume we lose no data
wcsStruct = arg[1:].astype(numpy.int16)
# Every time set() is called, reset the wcs sizes. We may be plotting
# with old-compiled 32-bit tasks, then with new-compiled 32-bit tasks,
# then with 64-bit tasks, all within the same PyRAF session.
init_wcs_sizes(forceResetTo=int(arg[0]/(1.*WCS_SLOTS)))
# Check that eveything is sized as expected
if arg[0] != len(wcsStruct):
raise IrafError("Inconsistency in length of WCS graphics struct: "+\
str(arg[0]))
if len(wcsStruct) != _WCS_RECORD_SIZE*WCS_SLOTS:
raise IrafError("Unexpected length of WCS graphics struct: "+\
str(len(wcsStruct)))
# Read through the input to populate self.pending
SZ = 2
if _IRAF64BIT: SZ = 4
self.pending = [None]*WCS_SLOTS
for i in xrange(WCS_SLOTS):
record = wcsStruct[_WCS_RECORD_SIZE*i:_WCS_RECORD_SIZE*(i+1)]
# read 8 4-byte floats from beginning of record
fvals = numpy.fromstring(ndarr2bytes(record[:8*SZ]),numpy.float32)
if _IRAF64BIT:
# seems to send an extra 0-valued int32 after each 4 bytes
fvalsView = fvals.reshape(-1,2).transpose()
if fvalsView[1].sum() != 0:
raise IrafError("Assumed WCS float padding is non-zero")
fvals = fvalsView[0]
# read 3 4-byte ints after that
ivals = numpy.fromstring(ndarr2bytes(record[8*SZ:11*SZ]),numpy.int32)
if _IRAF64BIT:
# seems to send an extra 0-valued int32 after each 4 bytes
ivalsView = ivals.reshape(-1,2).transpose()
if ivalsView[1].sum() != 0:
raise IrafError("Assumed WCS int padding is non-zero")
ivals = ivalsView[0]
self.pending[i] = tuple(fvals) + tuple(ivals)
if len(self.pending[i]) != 11:
raise IrafError("Unexpected WCS struct record length: "+\
str(len(self.pending[i])))
if self.wcs is None:
self.commit()
def pack(self):
"""Return the WCS in the original IRAF format (in bytes-string)"""
init_wcs_sizes()
self.commit()
wcsStruct = numpy.zeros(_WCS_RECORD_SIZE*WCS_SLOTS, numpy.int16)
pad = tobytes('\x00\x00\x00\x00')
if _IRAF64BIT:
pad = tobytes('\x00\x00\x00\x00\x00\x00\x00\x00')
for i in xrange(WCS_SLOTS):
x = self.wcs[i]
farr = numpy.array(x[:8],numpy.float32)
iarr = numpy.array(x[8:11],numpy.int32)
if _IRAF64BIT:
# see notes in set(); adding 0-padding after every data point
lenf = len(farr) # should be 8
farr_rs = farr.reshape(lenf,1) # turn array into single column
farr = numpy.append(farr_rs,
numpy.zeros((lenf,1), numpy.float32),
axis=1)
farr = farr.flatten()
leni = len(iarr) # should be 3
iarr_rs = iarr.reshape(leni,1) # turn array into single column
iarr = numpy.append(iarr_rs,
numpy.zeros((leni,1), numpy.int32),
axis=1)
iarr = iarr.flatten()
# end-pad?
if len(farr)+len(iarr) == (_WCS_RECORD_SIZE//2):
pad = BNULLSTR #for IRAF2.14 or prior; all new vers need end-pad
# Pack the wcsStruct - this will throw "ValueError: shape mismatch"
# if the padding doesn't bring the size out to exactly the
# correct length (_WCS_RECORD_SIZE)
wcsStruct[_WCS_RECORD_SIZE*i:_WCS_RECORD_SIZE*(i+1)] = \
numpy.fromstring(ndarr2bytes(farr)+ndarr2bytes(iarr)+pad, numpy.int16)
return ndarr2bytes(wcsStruct)
def transform(self, x, y, wcsID):
"""Transform x,y to wcs coordinates for the given
wcs (integer 0-16) and return as a 2-tuple"""
self.commit()
if wcsID == 0: return (x, y, wcsID)
# Since transformation is defined by a direct linear (or log) mapping
# between two rectangular windows, apply the usual linear
# interpolation.
# log scale does not affect the w numbers at all, a plot
# ranging from 10 to 10,000 will have wx1,wx2 = (10,10000),
# not (1,4)
return (self.transform1d(coord=x,dimension='x',wcsID=wcsID),
self.transform1d(coord=y,dimension='y',wcsID=wcsID),
wcsID)
def transform1d(self, coord, dimension, wcsID):
wx1, wx2, wy1, wy2, sx1, sx2, sy1, sy2, xt, yt, flag = \
self.wcs[wcsID-1]
if dimension == 'x':
w1,w2,s1,s2,type = wx1,wx2,sx1,sx2,xt
elif dimension == 'y':
w1,w2,s1,s2,type = wy1,wy2,sy1,sy2,yt
if (s2-s1) == 0.:
raise IrafError("IRAF graphics WCS is singular!")
fract = (coord-s1)/(s2-s1)
if type == LINEAR:
val = (w2-w1)*fract + w1
elif type == LOG:
lw2, lw1 = math.log10(w2), math.log10(w1)
lval = (lw2-lw1)*fract + lw1
val = 10**lval
elif type == ELOG:
# Determine inverse mapping to determine corresponding values of s to w
# This must be done to figure out which regime of the elog function the
# specified point is in. (cs*ew + c0 = s)
ew1, ew2 = elog(w1), elog(w2)
cs = (s2-s1)/(ew2-ew1)
c0 = s1 - cs*ew1
# linear part is between ew = 1 and -1, so just map those to s
s10p = cs + c0
s10m = -cs + c0
if coord > s10p: # positive log area
frac = (coord-s10p)/(s2-s10p)
val = 10.*(w2/10.)**frac
elif coord >= s10m and coord <= s10p: # linear area
frac = (coord-s10m)/(s10p-s10m)
val = frac*20 - 10.
else: # negative log area
frac = -(coord-s10m)/(s10m-s1)
val = -10.*(-w1/10.)**frac
else:
raise IrafError("Unknown or unsupported axis plotting type")
return val
def _isWcsDefined(self, i):
w = self.wcs[i]
if w[-1] & NEWFORMAT:
if w[-1] & DEFINED: return 1
else: return 0
else:
if w[4] or w[5] or w[6] or w[7]: return 0
else: return 1
def get(self, x, y, wcsID=None):
"""Returned transformed values of x, y using given wcsID or
closest WCS if none given. Return a tuple (wx,wy,wnum) where
wnum is the selected WCS (0 if none defined)."""
self.commit()
if wcsID is None:
wcsID = self._getWCS(x,y)
return self.transform(x,y,wcsID)
def _getWCS(self, x, y):
"""Return the WCS (16 max possible) that should be used to
transform x and y. Returns 0 if no WCS is defined."""
# The algorithm for determining which of multiple wcs's
# should be selected is thus (and is different in one
# respect from the IRAF cl):
#
# 1 determine which viewports x,y fall in
# 2 if more than one, the tie is broken by choosing the one
# whose center is closer.
# 3 in case of ties, the higher number wcs is chosen.
# 4 if inside none, the distance is computed to the nearest part
# of the viewport border, the one that is closest is chosen
# 5 in case of ties, the higher number wcs is chosen.
indexlist = []
# select subset of those wcs slots which are defined
for i in xrange(len(self.wcs)):
if self._isWcsDefined(i):
indexlist.append(i)
# if 0 or 1 found, we're done!
if len(indexlist) == 1:
return indexlist[0]+1
elif len(indexlist) == 0:
return 0
# look for viewports x,y is contained in
newindexlist = []
for i in indexlist:
x1,x2,y1,y2 = self.wcs[i][4:8]
if (x1 <= x <= x2) and (y1 <= y <= y2):
newindexlist.append(i)
# handle 3 cases
if len(newindexlist) == 1:
# unique, so done
return newindexlist[0]+1
# have to find minimum distance either to centers or to edge
dist = []
if len(newindexlist) > 1:
# multiple, find one with closest center
for i in newindexlist:
x1,x2,y1,y2 = self.wcs[i][4:8]
xcen = (x1+x2)/2
ycen = (y1+y2)/2
dist.append((xcen-x)**2 + (ycen-y)**2)
else:
# none, now look for closest border
newindexlist = indexlist
for i in newindexlist:
x1,x2,y1,y2 = self.wcs[i][4:8]
xdelt = min([abs(x-x1),abs(x-x2)])
ydelt = min([abs(y-y1),abs(y-y2)])
if x1 <= x <= x2:
dist.append(ydelt**2)
elif y1 <= y <= y2:
dist.append(xdelt**2)
else:
dist.append(xdelt**2 + ydelt**2)
# now return minimum distance viewport
# reverse is used to give priority to highest WCS value
newindexlist.reverse()
dist.reverse()
minDist = min(dist)
return newindexlist[dist.index(minDist)]+1
def _setWCSDefault():
"""Define default WCS for STDGRAPH plotting area."""
# set 8 4 byte floats
farr = numpy.array([0.,1.,0.,1.,0.,1.,0.,1.],numpy.float32)
# set 3 4 byte ints
iarr = numpy.array([LINEAR,LINEAR,CLIP+NEWFORMAT],numpy.int32)
wcsarr = tuple(farr)+tuple(iarr)
wcs = []
for i in xrange(WCS_SLOTS):
wcs.append(wcsarr)
return wcs
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