109 lines
3.0 KiB
TypeScript
109 lines
3.0 KiB
TypeScript
// import { JsonAsset, BufferAsset, resources } from "cc";
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type MetaType = {
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MIN_LAT: number;
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MAX_LAT: number;
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MIN_LNG: number;
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MAX_LNG: number;
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STEP_DEG: number;
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ROWS: number;
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COLS: number;
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id2name: Record<string, string>;
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};
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let _ready = false;
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let _meta: MetaType | null = null;
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let _grid: Uint8Array | null = null;
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let _ID2NAME: Record<number, string> = {};
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/**
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* 初始化省份定位（游戏启动时调一次）
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* pathJson: resources 下的 json 路径，不含扩展名
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* pathBin: resources 下的 bin 路径，不含扩展名
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*/
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export function initProvinceLocator(
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pathJson: string = "geo/province_names",
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pathBin: string = "geo/province_grid"
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): Promise<void> {
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return new Promise((resolve, reject) => {
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// 1. 先加载 meta json
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cc.resources.load(pathJson, cc.JsonAsset, (err, jsonAsset) => {
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if (err) {
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console.error("[ProvinceLocator] 加载 JSON 失败", err);
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reject(err);
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return;
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}
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//@ts-ignore
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const meta = jsonAsset.json as MetaType;
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// 2. 再加载二进制网格
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cc.resources.load(pathBin, cc.BufferAsset, (err2, bufAsset) => {
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if (err2) {
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console.error("[ProvinceLocator] 加载 BIN 失败", err2);
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reject(err2);
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return;
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}
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// BufferAsset 的底层数据在 _nativeAsset 里，是 ArrayBuffer
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const arrayBuffer = (bufAsset as any)._nativeAsset as ArrayBuffer;
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const grid = new Uint8Array(arrayBuffer);
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_meta = meta;
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_grid = grid;
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_ID2NAME = {};
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for (const k in meta.id2name) {
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_ID2NAME[parseInt(k, 10)] = meta.id2name[k];
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}
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_ready = true;
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console.log(
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"[ProvinceLocator] 初始化成功，网格大小",
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meta.ROWS,
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"x",
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meta.COLS
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);
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resolve();
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});
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});
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});
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}
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/**
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* 根据经纬度返回省份名称
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* 调用前务必先 initProvinceLocator
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*/
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export function getProvinceName(lat: number, lng: number): string {
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if (!_ready || !_meta || !_grid) {
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console.warn("[ProvinceLocator] 尚未初始化，返回未知");
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return "其他";
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}
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const {
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MIN_LAT,
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MAX_LAT,
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MIN_LNG,
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MAX_LNG,
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STEP_DEG,
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ROWS,
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COLS,
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} = _meta;
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if (lat < MIN_LAT || lat > MAX_LAT || lng < MIN_LNG || lng > MAX_LNG) {
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return "其他";
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}
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let r = Math.floor((lat - MIN_LAT) / STEP_DEG);
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let c = Math.floor((lng - MIN_LNG) / STEP_DEG);
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// 边界保护
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if (r < 0) r = 0;
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if (r >= ROWS) r = ROWS - 1;
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if (c < 0) c = 0;
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if (c >= COLS) c = COLS - 1;
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const index = r * COLS + c;
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const pid = _grid[index];
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if (!pid) return "其他";
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return _ID2NAME[pid] || "其他";
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} |