最近我需要使用react+ts绘制一个界面，里面需要以中国地图的形式展示区块链从2019-2024年这五年的备案以及注销情况，所以研究了一下这方面的工作，初步有了一些成果，所以现在做一些分享，希望对大家有帮助！
在这篇博客中，我们将介绍如何使用 React 和 TypeScript 绘制中国地图。教程分为三个部分：介绍 GeoJSON 文件，使用 React 封装 ChinaMap 组件，以及分享遇到的坑和解决方法。
1.GeoJSON 简介与基础语法
1.什么是 GeoJSON？
GeoJSON 是一种基于 JSON（JavaScript Object Notation）格式的开放标准，用于表示各种地理数据结构。它可以表示点、线、多边形以及多点、多线、多边形集合等复杂的地理数据类型。GeoJSON 广泛用于 Web 地图应用程序中，因其易读性和与 JSON 的兼容性而受到欢迎。
2.GeoJSON 的基本结构
一个典型的 GeoJSON 文件包括以下几个部分：
- FeatureCollection：一个要素集合，用于包含多个地理要素。
- Feature：一个单独的地理要素，包含几何数据和属性信息。
- Geometry：几何数据，可以是点、线、多边形等。
- Properties：属性信息，用于描述几何数据的属性。
下面是一个基本的 GeoJSON 示例，包含一个多边形（Polygon）：
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"name": "中国"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[73.5, 18.2],
[135.1, 18.2],
[135.1, 53.6],
[73.5, 53.6],
[73.5, 18.2]
]
]
}
}
]
}
3.GeoJSON 基础语法
-
FeatureCollection
FeatureCollection是 GeoJSON 文件的顶级对象，用于包含多个Feature。{ "type": "FeatureCollection", "features": [ // 这里包含多个 Feature 对象 ] } -
Feature
Feature是一个包含几何数据和属性的对象。每个Feature都有一个geometry和一个properties对象。{ "type": "Feature", "properties": { "name": "某地名" }, "geometry": { "type": "Polygon", // 几何类型，可以是 Point, LineString, Polygon 等 "coordinates": [ // 坐标数组，根据几何类型不同格式也不同 ] } } -
Geometry
Geometry包含地理要素的几何数据，主要有以下几种类型：-
Point：表示一个点。
{ "type": "Point", "coordinates": [102.0, 0.5] } -
LineString：表示一条线，由一系列坐标点组成。
{ "type": "LineString", "coordinates": [ [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0] ] } -
Polygon：表示一个多边形，由一系列坐标点组成的闭合环。
{ "type": "Polygon", "coordinates": [ [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ] ] } -
MultiPoint：表示多个点。
{ "type": "MultiPoint", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] } -
MultiLineString：表示多条线。
{ "type": "MultiLineString", "coordinates": [ [ [100.0, 0.0], [101.0, 1.0] ], [ [102.0, 2.0], [103.0, 3.0] ] ] } -
MultiPolygon：表示多个多边形。
{ "type": "MultiPolygon", "coordinates": [ [ [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ] ], [ [ [102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0] ] ] ] }
-
-
Properties
Properties是一个对象，用于描述几何数据的属性，可以包含任意的键值对。{ "properties": { "name": "某地名", "population": 1000000 } }
4.GeoJSON 常见应用场景
- 地图绘制：GeoJSON 常用于 Web 地图应用中，用于绘制地理边界、标记点和路线等。
- 地理数据分析：GeoJSON 可以与 GIS（地理信息系统）结合，用于空间数据分析和可视化。
- 数据交换：GeoJSON 是一种标准化的数据格式，适用于地理数据的交换和共享。
通过以上内容，应该对 GeoJSON 有了一个初步的了解。
接下来，我们可以继续学习如何在 React 项目中使用 GeoJSON 数据绘制中国地图。
2.用React封装ChinaMap组件
1.下载echarts
使用npm或者yarn下载echarts
1.npm下载
npm install echarts
2.yarn下载
yarn add echarts
2.下载china地图的jeojson
由第一部分介绍可知，GeoJSON是一种以json形式表示地理位置的文件，常用于地图的绘制。
因此，如果要绘制中国地图，从GeoJSON的角度出发，就是需要构建一个FeatureCollection对象，里面包含多个Feature对象，每一个Feature都是一个Polygon多边形。
具体的json文件可以去阿里的阿里可视化中心下载。
我这里直接给出对应的china.json文件，具体如下：
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"id": "xin_jiang",
"properties": {
"name": "新疆",
"cp": [84.9023, 41.748],
"childNum": 18
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[96.416, 42.7588],
[96.416, 42.7148],
[95.9766, 42.4951],
[96.0645, 42.3193],
[96.2402, 42.2314],
[95.9766, 41.9238],
[95.2734, 41.6162],
[95.1855, 41.792],
[94.5703, 41.4844],
[94.043, 41.0889],
[93.8672, 40.6934],
[93.0762, 40.6494],
[92.6367, 39.6387],
[92.373, 39.3311],
[92.373, 39.1113],
[92.373, 39.0234],
[90.1758, 38.4961],
[90.3516, 38.2324],
[90.6152, 38.3203],
[90.5273, 37.8369],
[91.0547, 37.4414],
[91.3184, 37.0898],
[90.7031, 36.7822],
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[91.0547, 36.0791],
[90.8789, 36.0352],
[90, 36.2549],
[89.9121, 36.0791],
[89.7363, 36.0791],
[89.209, 36.2988],
[88.7695, 36.3428],
[88.5938, 36.4746],
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[86.2207, 36.167],
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[82.4414, 35.7275],
[82.002, 35.332],
[81.6504, 35.2441],
[80.4199, 35.4199],
[80.2441, 35.2881],
[80.332, 35.1563],
[80.2441, 35.2002],
[79.8926, 34.8047],
[79.8047, 34.4971],
[79.1016, 34.4531],
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[78.2227, 34.7168],
[78.0469, 35.2441],
[78.0469, 35.5078],
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[76.2012, 35.8154],
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[75.4102, 36.958],
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[73.4766, 39.375],
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[73.916, 39.6826],
[73.8281, 39.7705],
[74.0039, 40.0342],
[74.8828, 40.3418],
[74.7949, 40.5176],
[75.2344, 40.4297],
[75.5859, 40.6494],
[75.7617, 40.2979],
[76.377, 40.3857],
[76.9043, 41.001],
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[86.8359, 49.1309],
[87.8027, 49.1748],
[87.8906, 48.999],
[87.7148, 48.9111],
[88.0664, 48.7354],
[87.9785, 48.6035],
[88.5059, 48.3838],
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[89.1211, 47.9883],
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[90.0879, 47.8564],
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[90.7031, 45.7471],
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[90.8789, 45.2197],
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[93.5156, 44.9561],
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[95.8887, 43.2422],
[96.3281, 42.9346],
[96.416, 42.7588]
]
]
}
},
{
"type": "Feature",
"id": "xi_zang",
"properties": {
"name": "西藏",
"cp": [88.7695, 31.6846],
"childNum": 7
},
"geometry": {
"type": "Polygon",
"coordinates": [
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]
]
}
},
{
"type": "Feature",
"id": "nei_meng_gu",
"properties": {
"name": "内蒙古",
"cp": [117.5977, 44.3408],
"childNum": 12
},
"geometry": {
"type": "Polygon",
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3.ChinaMap子组件封装
这部分代码中，我下载的china.json文件和tsx文件在同一目录下，因此可以直接使用import china from ‘./china.json’;导入，具体的导入需要根据你下载的china.json存储路径来修改！
import china from './china.json';
import * as echarts from 'echarts'; //全局引入 ，可按需引入
import { useEffect, useRef } from 'react';
const ChinaMap = (props) => {
const chartRef = useRef();
const topNumber = props.data[0].value;
const bottomNumber = props.data[props.data.length - 1].value;
const echartsMapClick = () => {
//点击地图模块逻辑事件
};
const mapOption = (mapName, data) => {
const myChart = echarts.init(chartRef.current);
echarts.registerMap(mapName, data);
const option = {
tooltip: {
backgroundColor: 'rgba(21, 24, 45, 0.9)', // 提示框浮层的背景颜色。
textStyle: {
// 提示框浮层的文本样式。
color: '#fff',
fontSize: 14,
},
extraCssText: 'border-color: rgba(21, 24, 45, 0.9);',
formatter: function (params) {
//数据格式化
const val = params.value ? params.value : 0;
if (params.value) {
return (
params.name + '<br />' + params.seriesName + ':' + val
);
} else {
return '暂无数据';
}
},
},
visualMap: {
min: 0,
max: topNumber,
left: 'left',
top: 'bottom',
text: [topNumber, bottomNumber ], //取值范围的文字
inRange: {
color: ['#D2DDFF', '#6E92FF'], //取值范围的颜色
},
show: true, //图注
},
geo: {
map: 'china',
roam: false, //不开启缩放和平移
zoom: 1.23, //视角缩放比例
label: {
normal: {
show: true,
fontSize: '10',
color: 'rgba(0,0,0,0.7)',
},
},
itemStyle: {
normal: {
borderColor: 'rgba(0, 0, 0, 0.2)',
},
emphasis: {
areaColor: '#4BD6C7', //鼠标选择区域颜色
shadowOffsetX: 0,
shadowOffsetY: 0,
shadowBlur: 20,
borderWidth: 0,
shadowColor: 'rgba(0, 0, 0, 0.5)',
},
},
},
series: [
{
name:'人口',
type: 'map',
geoIndex: 0,
data: props.data,
},
],
};
myChart.setOption(option); //绘图
//点击画布内还是画布外
myChart.getZr().on('click', (params) => {
if (params.target) {
myChart.on('click', echartsMapClick); //增加点击事件
}
});
};
const loadingChina = () => {
mapOption('china', china); //初始化-创建中国地图
};
useEffect(() => {
loadingChina();
}, [props.data]);
return <div style={{ width: '100%', minHeight: '500px' }} ref={chartRef} />;
};
export default ChinaMap;
4.父组件应用
创建一个新的React组件，直接在return中返回地图组件，但是需要带上数据！
// 使用 Map
<ChainMap data={dataList} />
具体的数据格式按照
const list = [{'name':'武汉','value':20000},{'name':'重庆','value':4000}];
3.遇到的坑和解决方法
-
地图无法显示：确保
leaflet.css被正确引入，且容器的高度和宽度被设置（例如通过style属性）。 -
GeoJSON 数据格式问题：如果 GeoJSON 数据格式不正确，地图可能不会显示。确保你的 GeoJSON 文件是有效的，可以使用 GeoJSONLint 来验证。
-
地图中心和缩放级别：根据你的需要调整地图的中心点和缩放级别。在中国地图的例子中，我们选择了
[35.86166, 104.195397]作为中心点，缩放级别为4。 -
性能问题：如果 GeoJSON 数据非常大，可能会导致性能问题。可以考虑简化 GeoJSON 数据或使用
react-leaflet提供的其他优化技术。
上面这些问题我倒是没遇到，但是我渲染完数据之后，发现有时候加载地图那个界面有时候会加载不出来，经过排查后发现：问题出现在这一段代码中
visualMap: {
min: 0,
max: topNumber,
left: 'left',
top: 'bottom',
text: [topNumber, bottomNumber ], //取值范围的文字
inRange: {
color: ['#D2DDFF', '#6E92FF'], //取值范围的颜色
},
show: true, //图注
}
为什么会出现上面的问题呢，因为，后面接入系统后，地图中的数据是通过请求后端接口获得的，而如果有时候因为各种原因后端没有及时返回数据，那么这个max:topNumber 就没有对应的数值，那么加载地图就会直接报错
SyntaxError: Failed to execute 'addColorStop' on 'CanvasGradient': The value provided ('undefined') could not be parsed as a color.
具体解决方法，在给topNumber赋值时，不要直接给它赋值，要考虑如果后端没有获取到数据的i情况，具体如下所示：
const values = props.data.map((item) => item.value);
const hasValues = values.length > 0;
const topNumber = hasValues ? Math.max(...values) : 0;
const bottomNumber = hasValues ? Math.min(...values) : 0;
