48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
from __future__ import annotations
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import json
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from pathlib import Path
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from engine.map import Map
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from engine.tile import TILE_LAYERS, Tile, TileLayerInstance
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def _layer_instances(fields: dict) -> dict[str, TileLayerInstance | None]:
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return {layer: (TileLayerInstance(def_id) if def_id else None) for layer, def_id in fields.items() if layer in TILE_LAYERS}
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class MapLoader:
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"""Builds Map graphs (including embedded sub-maps) from resources/defs/maps/*.json."""
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def __init__(self, maps_dir: Path):
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self.maps_dir = maps_dir
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self._cache: dict[str, Map] = {}
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def load(self, filename: str) -> Map:
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data = json.loads((self.maps_dir / filename).read_text())
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map_id = data["map_id"]
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if map_id in self._cache:
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return self._cache[map_id]
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m = Map(map_id, data["width"], data["height"], data["depth"], source_def=filename)
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self._cache[map_id] = m
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default_tile = data.get("default_tile", {})
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for z in range(m.depth):
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for y in range(m.height):
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for x in range(m.width):
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m.set_tile(x, y, z, Tile(**_layer_instances(default_tile)))
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for override in data.get("tiles", []):
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x, y, z = override["x"], override["y"], override["z"]
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fields = {k: v for k, v in override.items() if k not in ("x", "y", "z")}
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tile = m.get_tile(x, y, z)
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for layer, instance in _layer_instances(fields).items():
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tile.set_layer(layer, instance)
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for embedding in data.get("embeddings", []):
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child = self.load(embedding["map_file"])
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m.embed(child, tuple(embedding["anchor"]), embedding.get("rotation", 0))
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return m
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