@amap/amap-jsapi-loader 实现高德地图中添加多边围栏，并可编辑，编辑后获得围栏各个点的经纬度

先上一张效果图看看是不是大家想要的效果～ ❤️
希望其中的小点能帮助大家，主要看怎么绘制在地图上的代码即可
在这里插入图片描述

1.第一步要加入项目package.json中或者直接yarn install它都可以
想必大家应该都会

 "@amap/amap-jsapi-loader": "0.0.7"

2.加入项目中

import React, { PureComponent } from 'react';
import { Radio, Checkbox, Input, Button, message as AntMessage } from 'antd';
import AMapLoader from '@amap/amap-jsapi-loader';
import { services } from '@comall-backend-builder/core';
import './index.less';

const { api } = services;
type Geofence = {
    /**
     * 圆形围栏中心点,格式：longitude,latitude
     */
    center?: string;
    /**
     * 围栏名称
     */
    name: string;
    /**
     * 多边形围栏坐标点,格式:lon1,lat1;lon2,lat2;lon3,lat3
     */
    points: string;
    /**
     * 圆形围栏半径,单位：米。范围0~5000
     */
    radius?: number;
};
type GeofenceValue = {
    geofences: Array<Geofence>;
    scope: string;
    isEdit?: boolean;
};
const DEFAULTSCOPE = 'CUSTOM';
const DEFAULTNAME = '默认区域';
interface GeofencesProps {
    onChange: (data: GeofenceValue) => void;
    /**
     * 当前值
     */
    value: GeofenceValue;
    row: any;
}

interface GeofencesStates {
    /**
     * 当前地图实例
     */
    map: any;
    /**
     * 地图api
     */
    AMap: any;
    /**
     * 多边形对象集合
     */
    polygons: any;
    /**
     * 门店位置标记
     */
    marker: any;
    /**
     * 当前的门店维度
     */
    centerPosition: any;
    /**
     * 当前的门店名称
     */
    subsiteName: string;
}

export class Geofences extends PureComponent<GeofencesProps, GeofencesStates> {
    constructor(props: any) {
        super(props);

        this.state = {
            map: undefined,
            AMap: undefined,
            polygons: undefined,
            marker: undefined,
            centerPosition: undefined,
            subsiteName: '',
        };
    }

    componentDidMount() {
        this.initMap();
    }

    initMap = () => {
        api.get({}, { apiPath: '/admin/amap/config' }).then((result: any) => {
            AMapLoader.load({
                key: result.key, // 申请好的Web端开发者Key，首次调用 load 时必填
                version: '1.4.15', // 指定要加载的 JSAPI 的版本，缺省时默认为 1.4.15
                plugins: ['AMap.Marker', 'AMap.Polygon', 'AMap.PolyEditor'], // 需要使用的的插件列表，如比例尺'AMap.Scale'等
            })
                .then((AMap: any) => {
                    let map = new AMap.Map('mapContainer', {
                        zoom: 13,
                    });
                    this.initSubsiteCenterPosition(AMap, map);
                    this.setState({ AMap, map });
                })
                .catch((e: any) => {
                    console.log(e);
                });
        });
    };

    initSubsiteCenterPosition = (AMap: any, map: any) => {
        const result = {
            longitude: 150.644,
            latitude: -34.397
        }
        //以上是我们项目接口返回的一个点的经纬度，在此我就简单设置了
        let centerPosition = new AMap.LngLat(result.longitude, result.latitude); // 经纬度对象，也可以是经纬度构成的一维数组[116.39, 39.9]
        this.setState(
            {
                centerPosition: centerPosition,
            },
            () => {
                this.initGeofrences(AMap, map);
            }
        );
    };

    initGeofrences = (AMap: any, map: any) => {
        const { centerPosition, subsiteName } = this.state;
        //移除所有覆盖物
        const { polygons, marker } = this.state;
        if (polygons) {
            map.remove(polygons);
        }
        if (marker) {
            map.remove(marker);
        }

        // 创建一个 Marker 实例：
        let newMarker = new AMap.Marker({
            position: centerPosition,
            title: subsiteName,
            zIndex: 101,
            bubble: true,
        });
        // 将创建的点标记添加到已有的地图实例：
        map.add(newMarker);

        let newPolygons = [];
        const path = [
            centerPosition.offset(-1500, 1500),
            centerPosition.offset(1500, 1500),
            centerPosition.offset(1500, -1500),
            centerPosition.offset(-1500, -1500),
        ];

        let polygon = new AMap.Polygon({
            path: path,
            strokeColor: '#1791fc',
            strokeWeight: 6,
            strokeOpacity: 0.2,
            fillOpacity: 0.4,
            fillColor: '#1791fc',
            zIndex: 100,
            bubble: true,
        });
        newPolygons.push(polygon);

        map.add(newPolygons);
        // 缩放地图到合适的视野级别
        map.setFitView(newPolygons);

        //开启多边形编辑
        newPolygons.forEach((newPolygon, index) => {
            let newPolyEditor = new AMap.PolyEditor(map, newPolygon);
            newPolyEditor.open();

            newPolyEditor.on('addnode', () => {
                this.onPolygonChange(index);
            });

            newPolyEditor.on('adjust', () => {
                this.onPolygonChange(index);
            });

            newPolyEditor.on('removenode', () => {
                this.onPolygonChange(index);
            });
        });

        this.setState({
            map,
            polygons: newPolygons,
            marker: newMarker,
        });
        //回传默认值
        let points = this.getPoints(path);
        let newValue: GeofenceValue = {
            scope: DEFAULTSCOPE,
            geofences: [
                {
                    name: DEFAULTNAME,
                    points,
                },
            ],
        };
        this.onChange(newValue);
    };

    onChange = (data: GeofenceValue) => {
        const { onChange } = this.props;
        onChange(data);
    };

    onPolygonChange = (index: number) => {
        let { value } = this.props;
        const { polygons } = this.state;
        let geofences;
        let geofence;
        if (value) {
            geofences = value.geofences;
            geofence = geofences[index];

            let points;
            if (polygons && polygons[index]) {
                points = this.getPoints(polygons[index].getPath());
            }
            geofence = { ...geofence, points };

            geofences.splice(index, 1, geofence);

            value = { ...value, geofences: geofences };
            this.onChange(value);
        }
    };

    onChangeScope = () => {};

    onNameChange = (event: any, index: number) => {
        let { value } = this.props;
        let geofences;
        let geofence;
        if (value) {
            geofences = value.geofences;
            geofence = geofences[index];
            geofence = { ...geofence, name: event.target.value };

            geofences.splice(index, 1, geofence);

            value = { ...value, geofences: geofences };
            this.onChange(value);
        }
    };

    getPoints = (path: any) => {
        return path
            .map((point: any) => {
                return point.lng + ',' + point.lat;
            })
            .join(';');
    };

    addPolygon = () => {
        const { AMap, map, centerPosition } = this.state;
        const { value } = this.props;
        if (value && value.geofences && value.geofences.length >= 10) {
            AntMessage.warning('仅支持最多配置10个自定义范围');
            return;
        }
        if (AMap && map && centerPosition) {
            const path = [
                centerPosition.offset(-1500, 1500),
                centerPosition.offset(1500, 1500),
                centerPosition.offset(1500, -1500),
                centerPosition.offset(-1500, -1500),
            ];
            const points = this.getPoints(path);
            let geofences = value.geofences;
            geofences.push({
                name: DEFAULTNAME,
                points,
            });
            value.geofences = geofences;
            this.onChange(value);
            setTimeout(() => {
                this.initGeofrences(AMap, map);
            }, 1000);
        }
    };

    deletePolygon = (index: number) => {
        let { value } = this.props;
        const { AMap, map } = this.state;
        if (value && map) {
            const newGeofences = value.geofences.slice();
            newGeofences.splice(index, 1);
            value.geofences = newGeofences;
            this.onChange(value);
            setTimeout(() => {
                map.clearMap();
                this.initGeofrences(AMap, map);
            }, 1000);
        }
    };

    render() {
        const { value } = this.props;

        const geofences = value && value.geofences ? value.geofences : [];
        const scope = value && value.scope ? value.scope : DEFAULTSCOPE;
        return (
            <div className="geofences">
                <Radio.Group onChange={this.onChangeScope} value={scope}>
                    <Radio value={'CUSTOM'}>自定义配送范围</Radio>
                </Radio.Group>
                <div className="scope-tip">
                    可以自定义半径5公里内的区域，收货地址在配送范围外的买家，不可以选择下单
                </div>
                <div className="geofences-wrap">
                    <div className="map-container" id="mapContainer"></div>

                    {geofences && geofences.length > 0 && (
                        <div className="setting-wrap">
                            <div className="setting-geofences-wrap">
                                {geofences.map((geofence, index) => {
                                    return (
                                        <Checkbox key={index} checked>
                                            <Input
                                                onChange={(e) => {
                                                    this.onNameChange(e, index);
                                                }}
                                                style={{ width: 145 }}
                                                value={geofence.name}
                                                maxLength={10}
                                            />
                                            {index !== 0 && (
                                                <span
                                                    className="setting-delete"
                                                    onClick={this.deletePolygon.bind(this, index)}
                                                >
                                                    {services.language.getText('common.delete')}
                                                </span>
                                            )}
                                        </Checkbox>
                                    );
                                })}
                            </div>
                            <Button type="default" className="add-btn" onClick={this.addPolygon}>
                                添加配送区域
                            </Button>
                        </div>
                    )}
                </div>
            </div>
        );
    }
}