def neighbors(ctx, input):
"""Takes [x, y, z] tiles as input and writes adjacent
tiles on the same zoom level to stdout in the same form.
There are no ordering guarantees for the output tiles.
Input may be a compact newline-delimited sequences of JSON or
a pretty-printed ASCII RS-delimited sequence of JSON (like
https://tools.ietf.org/html/rfc8142 and
https://tools.ietf.org/html/rfc7159).
Example:
\b
echo "[486, 332, 10]" | mercantile neighbors
[485, 331, 10]
[485, 332, 10]
[485, 333, 10]
[486, 331, 10]
[486, 333, 10]
[487, 331, 10]
[487, 332, 10]
[487, 333, 10]
"""
src = normalize_input(input)
for line in iter_lines(src):
tile = json.loads(line)[:3]
tiles = mercantile.neighbors(tile)
for t in tiles:
output = json.dumps(t)
click.echo(output)
def test_neighbors_invalid():
x, y, z = 0, 166, 9
tiles = mercantile.neighbors(x, y, z)
assert len(tiles) == 8 - 3 # no top-left, left, bottom-left
assert all(t.z == z for t in tiles)
assert all(t.x - x in (-1, 0, 1) for t in tiles)
assert all(t.y - y in (-1, 0, 1) for t in tiles)
def test_neighbors():
x, y, z = 243, 166, 9
tiles = mercantile.neighbors(x, y, z)
assert len(tiles) == 8
assert all(t.z == z for t in tiles)
assert all(t.x - x in (-1, 0, 1) for t in tiles)
assert all(t.y - y in (-1, 0, 1) for t in tiles)
def test_root_neighbors_invalid():
x, y, z = 0, 0, 0
tiles = mercantile.neighbors(x, y, z)
assert len(tiles) == 0 # root tile has no neighbors