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432
packages/idraw/lib/p17/s02.dart
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432
packages/idraw/lib/p17/s02.dart
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import 'dart:math';
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// import 'dart:ui' as ui;
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import 'package:dio/dio.dart';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'dart:convert' show json;
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/// create by 张风捷特烈 on 2020/11/5
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/// contact me by email 1981462002@qq.com
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/// 说明:
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class Paper extends StatelessWidget {
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const Paper({super.key});
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@override
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Widget build(BuildContext context) {
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return Container(
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color: Colors.white,
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alignment: Alignment.center,
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child: const ChinaMap(),
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);
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}
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}
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class ChinaMap extends StatefulWidget {
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const ChinaMap({super.key});
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@override
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_ChinaMapState createState() => _ChinaMapState();
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}
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class _ChinaMapState extends State<ChinaMap> {
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final String url = 'https://geo.datav.aliyun.com/areas_v2/bound/100000_full.json'; //全国点位详细信息
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//请求点位信息地址
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Future<MapRoot?> getMapRoot() async {
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try {
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final Response response = await Dio().get(url);
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if (response.data != null) {
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return MapRoot.fromJson(response.data);
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} else {
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return null;
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}
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} catch (e) {
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print(e);
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return null;
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}
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}
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late Future<MapRoot?> _future;
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@override
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void initState() {
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super.initState();
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_future = getMapRoot();
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}
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@override
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Widget build(BuildContext context) {
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return FutureBuilder<MapRoot?>(
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future: _future,
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builder: (context, async) {
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print(async.hasData);
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if (async.hasData) {
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return CustomPaint(
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size: Size(500, 400),
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painter: MapPainter(mapRoot: async.data),
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);
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} else {
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return CupertinoActivityIndicator();
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}
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},
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);
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}
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}
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class MapPainter extends CustomPainter {
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final MapRoot? mapRoot; //点位信息
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late Paint _paint;
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final List<Color> colors = [Colors.red, Colors.yellow, Colors.blue, Colors.green];
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int colorIndex = 0;
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MapPainter({required this.mapRoot}) {
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_paint = Paint()
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..strokeWidth = 0.1
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..isAntiAlias = true;
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}
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@override
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void paint(Canvas canvas, Size size) {
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if(mapRoot == null) return;
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if(mapRoot!.features ==null) return;
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canvas.clipRect(
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Rect.fromPoints(Offset.zero, Offset(size.width, size.height)));
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canvas.translate(size.width / 2, size.height / 2);
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double dx = mapRoot!.features![0]?.geometry?.coordinates[0][0][0].dx??0;
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double dy = mapRoot!.features![0]?.geometry?.coordinates[0][0][0].dy??0;
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canvas.translate( -dx, -dy);
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double rate = 0.65;
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canvas.translate(-700*rate, 350*rate);
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canvas.scale(8*rate, -10.5*rate);
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_drawMap(canvas, size);
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}
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void _drawMap(Canvas canvas, Size size) {
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//全国省份循环
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for (int i = 0; i < mapRoot!.features!.length; i++) {
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var features = mapRoot!.features![i];
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if(features ==null) return;
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PaintingStyle style;
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Color color = Colors.black;
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style = PaintingStyle.fill;
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Path path = Path();
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if (features.properties?.name == "台湾省" ||
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features.properties?.name == "海南省" ||
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features.properties?.name == "河北省" ||
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features.properties?.name == "") { //海南和台湾和九段线
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Path otherPath = Path();
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features.geometry?.coordinates.forEach((List<List<Offset>> lv3) {
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for (var lv2 in lv3) {
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otherPath.moveTo(lv2[0].dx, lv2[0].dy);
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// for (var lv1 in lv2) {
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// otherPath.lineTo(lv1.dx, lv1.dy); //优化一半点位
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// print("========${lv1}==============================");
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// }
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}
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});
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path.addPath(otherPath, Offset.zero);
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if (features.properties?.name == "") {
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style = PaintingStyle.stroke;
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color = Colors.black;
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} else {
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style = PaintingStyle.fill;
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color = colors[colorIndex % 4];
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}
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colorIndex++;
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} else {
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final Offset first = features.geometry?.coordinates[0][0][0]??Offset.zero;
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path.moveTo(first.dx, first.dy);
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if(features.geometry ==null) return;
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for (Offset d in features.geometry!.coordinates.first.first) {
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path.lineTo(d.dx, d.dy);
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}
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style = PaintingStyle.fill;
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color = colors[colorIndex % 4];
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colorIndex++;
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}
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canvas.drawPath(path, _paint..color = color..style = style); //绘制地图
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}
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}
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@override
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bool shouldRepaint(MapPainter oldDelegate) => oldDelegate.mapRoot != mapRoot;
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}
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class MapRoot {
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String type;
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String name;
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List<Features?>? features;
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MapRoot({
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required this.type,
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required this.name,
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required this.features,
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});
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static MapRoot? fromJson(jsonRes) {
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if (jsonRes == null) return null;
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List<Features?>? features = jsonRes['features'] is List ? [] : null;
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if (features != null) {
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for (var item in jsonRes['features']) {
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if (item != null) {
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features.add(Features.fromJson(item));
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}
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}
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}
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return MapRoot(
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type: jsonRes['type'],
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name: jsonRes['name'],
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features: features,
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);
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}
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Map<String, dynamic> toJson() => {
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'type': type,
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'name': name,
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'features': features,
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};
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@override
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String toString() {
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return json.encode(this);
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}
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}
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class Features {
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String type;
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Properties? properties;
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Geometry? geometry;
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Features({
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required this.type,
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required this.properties,
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required this.geometry,
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});
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static Features? fromJson(jsonRes) => jsonRes == null
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? null
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: Features(
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type: jsonRes['type'],
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properties: Properties.fromJson(jsonRes['properties']),
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geometry: Geometry.fromJson(jsonRes['geometry']),
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);
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Map<String, dynamic> toJson() => {
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'type': type,
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'properties': properties,
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'geometry': geometry,
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};
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@override
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String toString() {
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return json.encode(this);
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}
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}
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class Properties {
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String? adcode;
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String? name;
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List<double>? center;
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List<double>? centroid;
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int? childrenNum;
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String?level;
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Parent? parent;
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int? subFeatureIndex;
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List<int>? acroutes;
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Object? adchar;
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Properties({
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required this.adcode,
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required this.name,
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required this.center,
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required this.centroid,
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required this.childrenNum,
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required this.level,
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required this.parent,
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required this.subFeatureIndex,
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required this.acroutes,
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required this.adchar,
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});
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static Properties? fromJson(jsonRes) {
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if (jsonRes == null) return null;
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List<double>? center = jsonRes['center'] is List ? [] : null;
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if (center != null) {
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for (var item in jsonRes['center']) {
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if (item != null) {
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center.add(item);
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}
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}
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}
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List<double>? centroid = jsonRes['centroid'] is List ? [] : null;
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if (centroid != null) {
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for (var item in jsonRes['centroid']) {
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if (item != null) {
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centroid.add(item);
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}
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}
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}
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List<int>? acroutes = jsonRes['acroutes'] is List ? [] : null;
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if (acroutes != null) {
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for (var item in jsonRes['acroutes']) {
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if (item != null) {
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acroutes.add(item);
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}
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}
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}
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return Properties(
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adcode: jsonRes['adcode'],
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name: jsonRes['name'],
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center: center,
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centroid: centroid,
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childrenNum: jsonRes['childrenNum'],
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level: jsonRes['level'],
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parent: Parent.fromJson(jsonRes['parent']),
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subFeatureIndex: jsonRes['subFeatureIndex'],
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acroutes: acroutes,
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adchar: jsonRes['adchar'],
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);
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}
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Map<String, dynamic> toJson() => {
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'adcode': adcode,
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'name': name,
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'center': center,
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'centroid': centroid,
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'childrenNum': childrenNum,
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'level': level,
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'parent': parent,
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'subFeatureIndex': subFeatureIndex,
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'acroutes': acroutes,
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'adchar': adchar,
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};
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@override
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String toString() {
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return json.encode(this);
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}
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}
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class Parent {
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int adcode;
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Parent({
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required this.adcode,
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});
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static Parent? fromJson(jsonRes) => jsonRes == null
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? null
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: Parent(
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adcode: jsonRes['adcode'],
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);
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Map<String, dynamic> toJson() => {
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'adcode': adcode,
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};
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@override
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String toString() {
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return json.encode(this);
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}
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}
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class Geometry {
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String type;
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List<List<List<Offset>>> coordinates;
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Geometry({
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required this.type,
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required this.coordinates,
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});
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static Geometry? fromJson(jsonRes) {
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if (jsonRes == null) return null;
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List<List<List<Offset>>>? coordinates =
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jsonRes['coordinates'] is List ? [] : null;
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bool fourLever =false;
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if (jsonRes['coordinates'] is List) {
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if (jsonRes['coordinates'][0] is List){
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if (jsonRes['coordinates'][0][0] is List){
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if (jsonRes['coordinates'][0][0][0] is List){
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fourLever =true;
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}
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}
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}
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}
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if(!fourLever){
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if (coordinates != null) {
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for (var level0 in jsonRes['coordinates']) {
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List<List<Offset>> lever0=[];
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if (level0 != null) {
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List<Offset> items1 = [];
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for (var item1 in level0 is List ? level0 : []) {
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if (item1 != null) {
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Offset items2 = Offset(item1[0], item1[1]);
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items1.add(items2);
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}
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lever0.add(items1);
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}
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}
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coordinates.add(lever0);
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}
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}
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}else{
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if (coordinates != null) {
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for (var level0 in jsonRes['coordinates']) {
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if (level0 != null) {
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List<List<Offset>> items1 = [];
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for (var item1 in level0 is List ? level0 : []) {
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if (item1 != null) {
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List<Offset> items2 = [];
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for (var item2 in item1 is List ? item1 : []) {
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if (item2 != null && item2 is List) {
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Offset items3 = Offset(item2[0], item2[1]);
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items2.add(items3);
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} else {
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items2.add(Offset.zero);
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}
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items1.add(items2);
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}
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}
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coordinates.add(items1);
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}
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}
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}
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}
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}
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return Geometry(
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type: jsonRes['type'],
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coordinates: coordinates??[],
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);
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}
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Map<String, dynamic> toJson() => {
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'type': type,
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'coordinates': coordinates,
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};
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@override
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String toString() {
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return json.encode(this);
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}
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}
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