feat(extract): Chunk-Zuordnung in Python und Beschriftungsliste lesen

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/extract/tests/test_coords.py

@@ -1,7 +1,7 @@
 import json
 from pathlib import Path
 
-from leonida.coords import SLICE, chunk_name, parse_chunk_name, pixel_to_world, slice_tiles, tile_for_world
+from leonida.coords import SLICE, chunk_for_world, chunk_name, parse_chunk_name, pixel_to_world, slice_tiles, tile_for_world
 
 # Derselbe Beispielsatz wie tests/coords.test.js — JavaScript und Python dürfen nicht auseinanderlaufen.
 NAMES = json.loads((Path(__file__).resolve().parents[3] / "tests/fixtures/chunk-names.json").read_text())
@@ -48,3 +48,13 @@ def test_chunk_names_round_trip_for_all_144_chunks():
 def test_chunk_names_reject_invalid_index_types():
     for i, j in NAMES["invalidIndices"]:
         assert chunk_name(i, j) is None
+
+
+def test_chunk_for_world_matches_javascript():
+    # Dieselben Beispiele wie tests/coords.test.js: Ecken des Ausschnitts, der Downtown-Bezugspunkt aus
+    # data/districts.json in B9 und der höchste Turm, das Southeast Financial Center, in C12.
+    assert chunk_for_world(-1000, 2500) == (0, 0)
+    assert chunk_for_world(1999, -499) == (11, 11)
+    assert chunk_for_world(-511, 254) == (1, 8)
+    assert chunk_name(*chunk_for_world(-511, 254)) == "B9"
+    assert chunk_name(*chunk_for_world(-461.31, -460.1)) == "C12"