不知道大家有没有感觉就是在做微信小程序地图功能时刚刚接触时候真的感觉好迷茫呀，文档看不懂，资料找不到，就很难受呀，比如我现在的功能就想想绘制出一个区域的轮廓图，主要是为了显眼，效果图如下：就是绘画出北京的轮廓图，蛋黄酥一样的这块。说清楚了我功能之后就开始说怎么实现了（源码码估计会放在程序的最后一段）。
开发思路
1.首先查看官方文档（点进去看就可以了好多配置，不一一细说）
微信小程序地图开发文档
2.看了官方文档后我还是不知道怎么弄，但是我确定用“polygon”这个东西来绘画出轮廓，这个参数大概的意思就是指定一系列坐标点，根据 points 坐标数据生成闭合多边形，我理解的意思就是你要用很多点，用点成线的形式在地图上描点。出线。
3.知道怎么绘画出轮廓之后，又迷茫了我怎么才能得到点，百度很久后有个大神给出方案
数据可视化平台 点进去看到自己想要的城市，导出点，把点加工下，得到轮廓数据，比如我是用的北京的\后期贴代码上来，直接看就ok。
4.有数据 后就开始写代码，直接上代码 (源码地址就在下一行)微信小程序绘制行政区轮廓图小程序: 用微信小程序内部的map来绘制行政区轮廓范围
（1）html 代码，很简单没啥子东西，就配置配置参数，不懂的话就去看官方文档
<map
id="mapId"
class="map"
latitude="{{latitude}}"
longitude="{{longitude}}"
bindmarkertap="onMarkerTap"
bindcallouttap="onCalloutTap"
bindlabeltap="onLabelTap"
scale='7.5'
polygons="{{polygon}}"
>
</map>
<view class="btn-area service">
<button bindtap="removeMarkers">
移除参与聚合点的marker
</button>
<button bindtap="addMarkers">
添加聚合点marker
</button>
</view>（2）css代码
.map {
width: 100%;
height: 300px;
}
.btn-area {
margin: 10px;
display: flex;
flex-wrap: wrap;
border: 1px solid #ccc;
}
button {
display: inline-block;
margin: 10px 5px;
}
（3）js代码这块比较重要呀（给自己看，太简单了哈哈哈哈哈哈哈哈哈，不过我就想一个人自娱自乐）
const app = getApp()
const img = '../image/location.png'
Page({
data: {
//中心经度
latitude: 40.2,
//中心纬度
longitude: 116.324520,
//polygons 多边形
polygon:[{
points: [
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],
fillColor: "#4F94CD33",
fillColor: "#ffff0033",
strokeColor: "#FFF",
strokeWidth: 2,
zIndex: 5,
}]
},
onLoad: function () {
this.mapCtx = wx.createMapContext('mapId')
this.setData({
polygon: this.data.polygon,
});
},
})
get
