56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
"""Umrechnung zwischen gtadb-Weltkoordinaten, Kacheln und Mosaikpixeln.
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Spiegelt src/world/coords.js. Beide Seiten müssen dieselben Werte liefern.
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"""
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import re
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TILE_PX = 256
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WORLD_HALF = 16384
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CHUNK_SIZE = 250
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SLICE = {"x0": -1000, "x1": 2000, "y0": -500, "y1": 2500}
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def tile_for_world(x: float, y: float) -> tuple[int, int]:
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return (int((WORLD_HALF - y) // TILE_PX), int((x + WORLD_HALF) // TILE_PX))
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def slice_tiles() -> list[tuple[int, int]]:
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r0, c0 = tile_for_world(SLICE["x0"], SLICE["y1"])
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r1, c1 = tile_for_world(SLICE["x1"] - 1, SLICE["y0"] + 1)
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return [(r, c) for r in range(r0, r1 + 1) for c in range(c0, c1 + 1)]
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def mosaic_origin_px() -> tuple[int, int]:
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"""Pixelversatz der Ausschnittsecke innerhalb des ungeschnittenen Kachelrasters."""
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r0, c0 = tile_for_world(SLICE["x0"], SLICE["y1"])
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return (SLICE["x0"] + WORLD_HALF - c0 * TILE_PX, (WORLD_HALF - SLICE["y1"]) - r0 * TILE_PX)
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def pixel_to_world(px: int, py: int) -> tuple[float, float]:
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return (SLICE["x0"] + px, SLICE["y1"] - py)
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CHUNKS_PER_SIDE = (SLICE["x1"] - SLICE["x0"]) // CHUNK_SIZE # 12
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CHUNK_COLUMNS = "ABCDEFGHIJKL"
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# [0-9] statt \d: in Python passt \d auch auf andere Ziffernzeichen wie ١ oder １, in JavaScript nicht.
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_CHUNK_NAME = re.compile(r"([A-La-l])([1-9][0-9]?)")
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def _is_index(k) -> bool:
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return isinstance(k, int) and not isinstance(k, bool) and 0 <= k < CHUNKS_PER_SIDE
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def chunk_name(i: int, j: int) -> str | None:
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"""Planquadrat-Name wie src/world/coords.js: Spalte A–L aus i, Zeile 1–12 aus j. A1 = Nordwest."""
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if not (_is_index(i) and _is_index(j)):
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return None
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return f"{CHUNK_COLUMNS[i]}{j + 1}"
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def parse_chunk_name(name: str) -> tuple[int, int] | None:
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"""Umkehrung von chunk_name. Akzeptiert Kleinschreibung, None außerhalb A1–L12."""
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match = _CHUNK_NAME.fullmatch(str(name))
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if not match or int(match.group(2)) > CHUNKS_PER_SIDE:
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return None
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return CHUNK_COLUMNS.index(match.group(1).upper()), int(match.group(2)) - 1
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