微信小程序开发学习之--地图绘制行政区域图

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: [{longitude:116.6212, latitude:41.0283},{longitude:116.6157, latitude:41.053},{longitude:116.6309, latitude:41.0608},{longitude:116.6896, latitude:41.0445},{longitude:116.6988, latitude:41.0208},{longitude:116.6777, latitude:40.9715},{longitude:116.7224, latitude:40.9273},{longitude:116.7134, latitude:40.9103},{longitude:116.7796, latitude:40.8771},{longitude:116.8047, latitude:40.8409},{longitude:116.8207, latitude:40.8483},{longitude:116.8762, latitude:40.8212},{longitude:116.8925, latitude:40.7803},{longitude:116.9251, latitude:40.7729},{longitude:116.9266, latitude:40.7449},{longitude:116.9696, latitude:40.7064},{longitude:117.0311, latitude:40.6921},{longitude:117.1107, latitude:40.7082},{longitude:117.2071, latitude:40.695},{longitude:117.3179, latitude:40.6578},{longitude:117.4092, latitude:40.6873},{longitude:117.5143, latitude:40.6611},{longitude:117.5004, latitude:40.6362},{longitude:117.462, latitude:40.6531},{longitude:117.4489, latitude:40.6515},{longitude:117.4482, latitude:40.6278},{longitude:117.4212, latitude:40.6354},{longitude:117.4218, latitude:40.5694},{longitude:117.3877, latitude:40.5608},{longitude:117.3502, latitude:40.5822},{longitude:117.3118, latitude:40.578},{longitude:117.2495, latitude:40.5482},{longitude:117.2629, latitude:40.513},{longitude:117.2187, latitude:40.5143},{longitude:117.2085, latitude:40.5009},{longitude:117.2354, latitude:40.4575},{longitude:117.2641, latitude:40.4415},{longitude:117.2341, latitude:40.4172},{longitude:117.2407, latitude:40.3944},{longitude:117.2243, latitude:40.3709},{longitude:117.2428, latitude:40.3698},{longitude:117.2749, latitude:40.3326},{longitude:117.2955, latitude:40.2782},{longitude:117.3317, latitude:40.2897},{longitude:117.3455, latitude:40.2349},{longitude:117.39, latitude:40.228},{longitude:117.3784, latitude:40.2103},{longitude:117.3933, latitude:40.2036},{longitude:117.3805, latitude:40.1963},{longitude:117.4069, latitude:40.1858},{longitude:117.3517, latitude:40.1732},{longitude:117.3606, latitude:40.157},{longitude:117.3473, latitude:40.1356},{longitude:117.3117, latitude:40.1394},{longitude:117.2744, latitude:40.1058},{longitude:117.2493, latitude:40.1165},{longitude:117.2112, latitude:40.0966},{longitude:117.1992, latitude:40.0673},{longitude:117.1855, latitude:40.085},{longitude:117.1803, latitude:40.0695},{longitude:117.1564, latitude:40.0787},{longitude:117.1392, latitude:40.0641},{longitude:117.0856, latitude:40.0751},{longitude:117.0218, latitude:40.0296},{longitude:116.9304, latitude:40.0553},{longitude:116.8707, latitude:40.0411},{longitude:116.8502, latitude:40.055},{longitude:116.8227, latitude:40.0465},{longitude:116.82, latitude:40.0283},{longitude:116.7778, latitude:40.0324},{longitude:116.7572, latitude:39.9633},{longitude:116.7826, latitude:39.9476},{longitude:116.7871, latitude:39.8868},{longitude:116.8041, latitude:39.8779},{longitude:116.8123, latitude:39.8897},{longitude:116.9002, latitude:39.8316},{longitude:116.9028, latitude:39.8483},{longitude:116.9174, latitude:39.8469},{longitude:116.9363, latitude:39.7951},{longitude:116.9536, latitude:39.7876},{longitude:116.8995, latitude:39.7587},{longitude:116.9167, latitude:39.7314},{longitude:116.8828, latitude:39.7186},{longitude:116.9065, latitude:39.6776},{longitude:116.8499, latitude:39.6676},{longitude:116.8512, latitude:39.6523},{longitude:116.8269, latitude:39.6382},{longitude:116.8354, latitude:39.617},{longitude:116.79, latitude:39.6105},{longitude:116.7851, latitude:39.5935},{longitude:116.7254, latitude:39.6242},{longitude:116.7006, latitude:39.621},{longitude:116.7263, latitude:39.5978},{longitude:116.7106, latitude:39.588},{longitude:116.694, latitude:39.6017},{longitude:116.6205, latitude:39.6017},{longitude:116.6079, latitude:39.6247},{longitude:116.5659, latitude:39.6198},{longitude:116.5623, latitude:39.6017},{longitude:116.5244, latitude:39.5965},{longitude:116.5274, latitude:39.5732},{longitude:116.5085, latitude:39.5511},{longitude:116.4709, latitude:39.5546},{longitude:116.4772, latitude:39.5344},{longitude:116.4368, latitude:39.5264},{longitude:116.4438, latitude:39.5099},{longitude:116.4017, latitude:39.528},{longitude:116.4229, latitude:39.4966},{longitude:116.4125, latitude:39.4817},{longitude:116.4441, latitude:39.4822},{longitude:116.4561, latitude:39.4589},{longitude:116.4344, latitude:39.4428},{longitude:116.3367, latitude:39.4561},{longitude:116.3056, latitude:39.4895},{longitude:116.2579, latitude:39.5005},{longitude:116.2462, latitude:39.5572},{longitude:116.204, latitude:39.5888},{longitude:116.1541, latitude:39.586},{longitude:116.1304, latitude:39.5677},{longitude:116.1014, latitude:39.5801},{longitude:116.0353, latitude:39.5718},{longitude:116.0164, latitude:39.5881},{longitude:115.9952, latitude:39.5771},{longitude:115.9784, latitude:39.5957},{longitude:115.9793, latitude:39.5724},{longitude:115.9575, latitude:39.5609},{longitude:115.9102, latitude:39.6008},{longitude:115.9117, latitude:39.5695},{longitude:115.8904, latitude:39.5686},{longitude:115.8877, latitude:39.5507},{longitude:115.8555, latitude:39.555},{longitude:115.8192, latitude:39.5308},{longitude:115.8287, latitude:39.507},{longitude:115.7521, latitude:39.5117},{longitude:115.7385, latitude:39.5463},{longitude:115.6921, latitude:39.5658},{longitude:115.6893, latitude:39.599},{longitude:115.6672, latitude:39.6156},{longitude:115.6573, latitude:39.6001},{longitude:115.5799, latitude:39.5895},{longitude:115.5452, latitude:39.6186},{longitude:115.5145, latitude:39.5918},{longitude:115.5224, latitude:39.64},{longitude:115.4782, latitude:39.6523},{longitude:115.5001, latitude:39.6909},{longitude:115.4924, latitude:39.7387},{longitude:115.4399, latitude:39.7521},{longitude:115.4249, latitude:39.7745},{longitude:115.4832, latitude:39.7987},{longitude:115.5071, latitude:39.7837},{longitude:115.5522, latitude:39.7947},{longitude:115.5693, latitude:39.8138},{longitude:115.5143, latitude:39.8377},{longitude:115.5292, latitude:39.8755},{longitude:115.509, latitude:39.8842},{longitude:115.5205, latitude:39.9022},{longitude:115.4807, latitude:39.9358},{longitude:115.4262, latitude:39.9504},{longitude:115.4545, latitude:40.0297},{longitude:115.5522, latitude:40.0792},{longitude:115.5576, latitude:40.0951},{longitude:115.5907, latitude:40.0964},{longitude:115.5991, latitude:40.12},{longitude:115.7411, latitude:40.1322},{longitude:115.777, latitude:40.1776},{longitude:115.8066, latitude:40.1533},{longitude:115.8519, latitude:40.148},{longitude:115.8481, latitude:40.184},{longitude:115.8721, latitude:40.1872},{longitude:115.8981, latitude:40.2364},{longitude:115.9689, latitude:40.2639},{longitude:115.9228, latitude:40.3247},{longitude:115.9183, latitude:40.3539},{longitude:115.8593, latitude:40.3624},{longitude:115.8604, latitude:40.3757},{longitude:115.7708, latitude:40.4426},{longitude:115.7822, latitude:40.4921},{longitude:115.736, latitude:40.5038},{longitude:115.7532, latitude:40.5388},{longitude:115.7906, latitude:40.5609},{longitude:115.8198, latitude:40.5593},{longitude:115.8277, latitude:40.5873},{longitude:115.8854, latitude:40.5952},{longitude:115.9078, latitude:40.6173},{longitude:115.9668, latitude:40.6063},{longitude:115.9834, latitude:40.5788},{longitude:116.0256, latitude:40.6067},{longitude:116.03, latitude:40.5974},{longitude:116.1217, latitude:40.6292},{longitude:116.1106, latitude:40.6469},{longitude:116.1349, latitude:40.6671},{longitude:116.1646, latitude:40.6634},{longitude:116.1779, latitude:40.7079},{longitude:116.2338, latitude:40.7591},{longitude:116.2476, latitude:40.7918},{longitude:116.2734, latitude:40.7629},{longitude:116.3089, latitude:40.7519},{longitude:116.3295, latitude:40.7738},{longitude:116.4617, latitude:40.7698},{longitude:116.4572, latitude:40.7983},{longitude:116.3344, latitude:40.9046},{longitude:116.3342, latitude:40.9213},{longitude:116.3703, latitude:40.9437},{longitude:116.3985, latitude:40.906},{longitude:116.4742, latitude:40.8961},{longitude:116.4475, latitude:40.9538},{longitude:116.4562, latitude:40.9813},{longitude:116.5163, latitude:40.9752},{longitude:116.5633, latitude:40.9936},{longitude:116.5988, latitude:40.9747},{longitude:116.6145, latitude:40.9833},{longitude:116.6212, latitude:41.0283}],fillColor: "#4F94CD33",fillColor: "#ffff0033",strokeColor: "#FFF",strokeWidth: 2,zIndex: 5,}]	},onLoad: function () {this.mapCtx = wx.createMapContext('mapId')this.setData({polygon: this.data.polygon,});},
})

get