105 lines
3.3 KiB
Dart
105 lines
3.3 KiB
Dart
import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:flutter_map/flutter_map.dart';
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import 'package:latlong2/latlong.dart';
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import 'package:flutter/services.dart' show rootBundle;
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// 🔥 1. 定义场站模型（核心）
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class DJIStation {
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/// 场站标识（对应瓦片目录名：assets/tiles/[name]）
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final String name;
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/// 场站显示名称（用于UI展示，如"一号场站"）
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final String displayName;
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const DJIStation({required this.name, required this.displayName});
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}
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/// 大疆高清瓦片图层组件（适配 flutter_map v6.x）
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class DJITileLayer extends StatefulWidget {
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/// 场站名称（对应 tiles/[stationName] 目录）
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final String stationName;
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/// 地图控制器（用于加载中心点后移动地图）
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final MapController mapController;
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const DJITileLayer({super.key, required this.stationName, required this.mapController});
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@override
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State<DJITileLayer> createState() => _DJITileLayerState();
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}
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class _DJITileLayerState extends State<DJITileLayer> {
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/// 场站中心点（从 parm/center.json 读取）
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LatLng? _stationCenter;
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/// 瓦片缩放级别范围
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final double _minZoom = 16;
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final double _maxZoom = 23;
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@override
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void initState() {
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super.initState();
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_loadStationCenter();
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}
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@override
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void didUpdateWidget(covariant DJITileLayer oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.stationName != widget.stationName) {
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_loadStationCenter();
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}
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}
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/// 从 assets/tiles/[stationName]/parm/center.json 读取中心点
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Future<void> _loadStationCenter() async {
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try {
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debugPrint("xsdscdvc");
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final String configPath = 'assets/tiles/${widget.stationName}/parm/center.json';
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debugPrint(configPath);
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final jsonString = await rootBundle.loadString('assets/tiles/liaoning/parm/center.json');
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debugPrint("$jsonString,jsonString");
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final Map<String, dynamic> centerJson = json.decode(jsonString);
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debugPrint("$centerJson,centerJson");
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final double lng = centerJson['lng'] ?? centerJson['lon'];
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final double lat = centerJson['lat'];
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final LatLng newCenter = LatLng(lat, lng);
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setState(() => _stationCenter = newCenter);
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widget.mapController.move(newCenter, 19);
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} catch (e) {
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debugPrint('加载${widget.stationName}中心点失败：$e');
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setState(() => _stationCenter = const LatLng(32.040644, 120.805718));
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}
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}
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@override
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Widget build(BuildContext context) {
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final String tileUrlTemplate = 'assets/tiles/${widget.stationName}/{z}/{x}/{y}.png';
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return TileLayer(
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urlTemplate: tileUrlTemplate,
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tileProvider: AssetTileProvider(), // 修复：直接使用类实例
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tms: true,
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minZoom: _minZoom,
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maxZoom: _maxZoom,
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);
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}
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}
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/// 修复：适配 v6.x 的 AssetTileProvider（移除过时的 TileLayerOptions）
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class AssetTileProvider extends TileProvider {
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@override
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ImageProvider<Object> getImage(TileCoordinates coords, TileLayer options) {
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// 修复：v6.x 中使用 TileCoordinates 替代 Coords，TileLayer 替代 TileLayerOptions
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final String path = options.urlTemplate!
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.replaceAll('{z}', coords.z.toString())
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.replaceAll('{x}', coords.x.toString())
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.replaceAll('{y}', coords.y.toString());
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debugPrint('加载大疆瓦片：$path');
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return AssetImage(path);
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}
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}
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