def test_nucleus(self):
for rdggs in [WGS84_123, WGS84_123_RADIANS]:
# Nuclei of children should be in correct position
# relative to parent cell in rHEALPix projection.
a = Cell(rdggs, (S, 7, 4, 1, 2, 1)) # Arbitrary cell.
w = a.width()
(x, y) = a.ul_vertex()
error = 1e-10
for (row, col) in product(list(range(3)), repeat=2):
s = str(row * 3 + col)
# Child cell in (row, column) position relative to a:
b = Cell(rdggs, list(a.suid) + [3 * row + col])
get = b.nucleus()
expect = (x + w / 6 + (w / 3) * col, y - w / 6 - (w / 3) * row)
self.assertTrue(rel_err(get, expect) < error)
def test_ul_vertex(self):
for rdggs in [WGS84_123, WGS84_123_RADIANS]:
# Should work for resolution 0 cells.
for X in rdggs.grid(0):
get = X.ul_vertex()
expect = rdggs.ul_vertex[X.suid[0]]
self.assertEqual(get, expect)
for X in rdggs.grid(0):
get = X.ul_vertex(plane=False)
p = rdggs.ul_vertex[X.suid[0]]
expect = rdggs.rhealpix(*p, inverse=True)
self.assertEqual(get, expect)
# Should work on children cells.
a = Cell(rdggs, (S, 2, 3))
l = a.resolution
x, y = a.ul_vertex()
w = rdggs.cell_width(l + 1)
error = 1e-10 # Error tolerance.
for (i, j) in product(list(range(3)), repeat=2):
b = Cell(rdggs, list(a.suid) + [i + 3 * j])
xx, yy = b.ul_vertex()
xp, yp = (x + i * w, y - j * w)
self.assertTrue(rel_err([xx, yy], [xp, yp]) < error)
a = Cell(rdggs, (S, 2, 3))
l = a.resolution
x, y = a.ul_vertex()
w = rdggs.cell_width(l + 1)
error = rdggs.ellipsoid.R_A * 1e-15 # Error tolerance.
for (i, j) in product(list(range(3)), repeat=2):
b = Cell(rdggs, list(a.suid) + [i + 3 * j])
xx, yy = b.ul_vertex(plane=False)
xp, yp = rdggs.rhealpix(x + i * w, y - j * w, inverse=True)
self.assertTrue(rel_err([xx, yy], [xp, yp]) < error)
