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from __future__ import print_function, absolute_import, division
# STDLIB
import codecs
import functools
import itertools
import math
import os
import random
import sys
# THIRD-PARTY
import numpy as np
from numpy.testing import assert_array_almost_equal
# LOCAL
from .. import polygon
from .test_shared import resolve_imagename
GRAPH_MODE = False
ROOT_DIR = os.path.join(os.path.dirname(__file__), 'data')
class union_test:
def __init__(self, lon_0, lat_0, proj='ortho'):
self._lon_0 = lon_0
self._lat_0 = lat_0
self._proj = proj
def __call__(self, func):
@functools.wraps(func)
def run(*args, **kwargs):
if GRAPH_MODE:
from mpl_toolkits.basemap import Basemap
from matplotlib import pyplot as plt
polys = func(*args, **kwargs)
unions = []
num_permutations = math.factorial(len(polys))
step_size = int(max(float(num_permutations) / 20.0, 1.0))
if GRAPH_MODE:
print("%d permutations" % num_permutations)
areas = [x.area() for x in polys]
for i, permutation in enumerate(
itertools.islice(
itertools.permutations(polys),
None, None, step_size)):
filename = '%s_union_%04d.svg' % (
func.__name__, i)
print(filename)
union = polygon.SphericalPolygon.multi_union(
permutation)
unions.append(union)
union_area = union.area()
print(union._points)
print(permutation[0]._points)
if GRAPH_MODE:
fig = plt.figure()
m = Basemap(projection=self._proj,
lon_0=self._lon_0,
lat_0=self._lat_0)
m.drawmapboundary(fill_color='white')
m.drawparallels(np.arange(-90., 90., 20.))
m.drawmeridians(np.arange(0., 420., 20.))
union.draw(m, color='red', linewidth=3)
for poly in permutation:
poly.draw(m, color='blue', alpha=0.5)
plt.savefig(filename)
fig.clear()
print(union_area, areas)
assert np.all(union_area * 1.1 >= areas)
lengths = np.array([len(x._points) for x in unions])
assert np.all(lengths == [lengths[0]])
areas = np.array([x.area() for x in unions])
assert_array_almost_equal(areas, areas[0], 1)
return run
@union_test(0, 90)
def test1():
from astropy.io import fits
fits = fits.open(resolve_imagename(ROOT_DIR, '1904-66_TAN.fits'))
header = fits[0].header
poly1 = polygon.SphericalPolygon.from_wcs(
header, 1, crval=[0, 87])
poly2 = polygon.SphericalPolygon.from_wcs(
header, 1, crval=[20, 89])
poly3 = polygon.SphericalPolygon.from_wcs(
header, 1, crval=[175, 89])
poly4 = polygon.SphericalPolygon.from_cone(
90, 70, 10, steps=50)
return [poly1, poly2, poly3, poly4]
@union_test(0, 90)
def test2():
poly1 = polygon.SphericalPolygon.from_cone(0, 60, 7, steps=16)
poly2 = polygon.SphericalPolygon.from_cone(0, 72, 7, steps=16)
poly3 = polygon.SphericalPolygon.from_cone(20, 60, 7, steps=16)
poly4 = polygon.SphericalPolygon.from_cone(20, 72, 7, steps=16)
poly5 = polygon.SphericalPolygon.from_cone(35, 55, 7, steps=16)
poly6 = polygon.SphericalPolygon.from_cone(60, 60, 3, steps=16)
return [poly1, poly2, poly3, poly4, poly5, poly6]
def test5():
from astropy.io import fits
from astropy import wcs as pywcs
A = fits.open(os.path.join(ROOT_DIR, '2chipA.fits.gz'))
wcs = pywcs.WCS(A[1].header, fobj=A)
chipA1 = polygon.SphericalPolygon.from_wcs(wcs)
wcs = pywcs.WCS(A[4].header, fobj=A)
chipA2 = polygon.SphericalPolygon.from_wcs(wcs)
null_union = chipA1.union(chipA2)
def test6():
from astropy.io import fits
from astropy import wcs as pywcs
A = fits.open(os.path.join(ROOT_DIR, '2chipC.fits.gz'))
wcs = pywcs.WCS(A[1].header, fobj=A)
chipA1 = polygon.SphericalPolygon.from_wcs(wcs)
wcs = pywcs.WCS(A[4].header, fobj=A)
chipA2 = polygon.SphericalPolygon.from_wcs(wcs)
null_union = chipA1.union(chipA2)
@union_test(0, 90)
def test7():
from astropy.io import fits
from astropy import wcs as pywcs
A = fits.open(os.path.join(ROOT_DIR, '2chipA.fits.gz'))
wcs = pywcs.WCS(A[1].header, fobj=A)
chipA1 = polygon.SphericalPolygon.from_wcs(wcs)
wcs = pywcs.WCS(A[4].header, fobj=A)
chipA2 = polygon.SphericalPolygon.from_wcs(wcs)
B = fits.open(os.path.join(ROOT_DIR, '2chipB.fits.gz'))
wcs = pywcs.WCS(B[1].header, fobj=B)
chipB1 = polygon.SphericalPolygon.from_wcs(wcs)
wcs = pywcs.WCS(B[4].header, fobj=B)
chipB2 = polygon.SphericalPolygon.from_wcs(wcs)
return [chipA1, chipA2, chipB1, chipB2]
@union_test(0, 90)
def test8():
from astropy.io import fits
fits = fits.open(resolve_imagename(ROOT_DIR, '1904-66_TAN.fits'))
header = fits[0].header
poly1 = polygon.SphericalPolygon.from_wcs(
header, 1)
poly2 = polygon.SphericalPolygon.from_wcs(
header, 1)
return [poly1, poly2]
def test_union_empty():
p = polygon.SphericalPolygon.from_cone(
random.randrange(-180, 180),
random.randrange(20, 90),
random.randrange(5, 16),
steps=16)
p2 = p.union(polygon.SphericalPolygon([]))
assert_array_almost_equal(p2._points, p._points)
def test_difficult_unions():
# Tests a number of intersections of real data that have been
# problematic in previous revisions of sphere
fname = resolve_imagename(ROOT_DIR, "difficult_intersections.txt")
with open(fname, 'rb') as fd:
lines = fd.readlines()
def to_array(line):
x = np.frombuffer(codecs.decode(line.strip(), 'hex_codec'), dtype='<f8')
return x.reshape((len(x) // 3, 3))
polys = []
for i in range(0, len(lines), 2):
points, inside, = [
to_array(line) for line in lines[i:i+2]]
poly = polygon.SphericalPolygon(points, inside)
polys.append(poly)
polygon.SphericalPolygon.multi_union(polys[:len(polys)//2])
if __name__ == '__main__':
if '--profile' not in sys.argv:
GRAPH_MODE = True
from mpl_toolkits.basemap import Basemap
from matplotlib import pyplot as plt
functions = [(k, v) for k, v in globals().items() if k.startswith('test')]
functions.sort()
for k, v in functions:
v()
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