高德地图-热力地图-实现在地图上绘制热力区域与工具栏操作
站长
· 阅读数 63
哈喽，各位高贵的倔友们你们好呀(✪ω✪)，今天这一篇文章继续分享高德地图的内容，这是第三篇也是最后一篇关于高德地图内容的分享了，后续将继续带来一些新的其他类型的文章分享，期望能继续得到你的关注。那么，如果各位看官大大觉得本章还不错，也希望能给点个赞呗，我们话不多说，直接进入正题。
写在开头
高德地图的申请、安装与初始化我们在上一篇文章讲过，这里就不多说啦，直接来进入本章的主题内容。
同样的配方，同样的操作，搞起。
数据准备
这里小编先准备了一些测试数据，下面会以这种数据结构来编写逻辑，如果你真实的数据结构与此不同，可以自行再转换一下或者适当调整一下代码逻辑。
创建 data.js 文件：
const data = [
{
"province": "北京市",
"city": "北京城区",
"area": "西城区",
"append": "北京市北京城区西城区3",
"lng": "116.365868",
"lat": "39.912289",
"count": "10",
},
{
"province": "上海市",
"city": "上海城区",
"area": "静安区",
"append": "上海市上海城区静安区5",
"lng": "121.459384",
"lat": "31.247105",
"count": "2",
},
{
"province": "广东省",
"city": "广州市",
"area": "黄埔区",
"append": "广东省广州市黄埔区4",
"lng": "113.459749",
"lat": "23.106402",
"count": "20",
},
{
"province": "四川省",
"city": "成都市",
"area": "青羊区",
"append": "四川省成都市青羊区6",
"lng": "104.062499",
"lat": "30.674406",
"count": "1",
},
{
"province": "河北省",
"city": "石家庄市",
"area": "桥西区",
"append": "河北省石家庄市桥西区2",
"lng": "114.461154",
"lat": "38.004043",
"count": "2",
},
{
"province": "重庆市",
"city": "重庆城区",
"area": "涪陵区",
"append": "重庆市重庆城区涪陵区1",
"lng": "107.389298",
"lat": "29.703113",
"count": "2",
},
{
"province": "广西省",
"city": "桂林市",
"area": "七星区",
"append": "广西壮族自治区2",
"lng": "110.317826",
"lat": "25.252701",
"count": "10",
},
{
"province": "湖南省",
"city": "长沙市",
"area": "望城区",
"append": "湖南省长沙市望城区2",
"lng": "112.819549",
"lat": "28.347458",
"count": "20",
},
{
"province": "湖南省",
"city": "郴州市",
"area": "永兴县",
"append": "湖南省郴州市永兴县4",
"lng": "113.116528",
"lat": "26.127151",
"count": "12",
},
];
export default data;
绘制热力区域
地图上绘制热力图，我们依旧使用的是高德地图提供的对象，这次使用到的是 AMap.HeatMap 对象，但是该热力图是高德基于第三方 heatmap.js 来实现的，所以如果需要更详细的参数解释，可以直接去 heatmap.js 官方文档看看。
以下是高德地图文档中对 AMap.HeatMap 对象的参数说明，大部分是和 heatmap.js 参数一致的，你也可以自己上官网瞅瞅(✪ω✪)。
下面我们来看看以我们本章的数据，如何来绘制出热力图，直接来看看代码：
<template>
<div id="container" />
</template>
<script>
import AMapLoader from "@amap/amap-jsapi-loader";
import data from "./data.js";
export default {
data() {
return {
// map:null,
};
},
async mounted() {
await this.initMap();
this.drawHeatMap();
},
methods: {
/** @name 初始化地图 **/
initMap() {
return new Promise(resolve => {
window._AMapSecurityConfig = {
securityJsCode: '你的安全密钥',
}
AMapLoader.load({
key: '你的Key',
version: '2.0',
plugins: [
'AMap.HeatMap'
],
}).then((AMap)=>{
this.map = new AMap.Map('container', {
center: [110.17293, 35.20173],
zoom: 3.8,
});
this.map.on('complete', () => {
resolve();
});
}).catch(e=>{
console.log(e);
})
})
},
/** @name 根据地址从高德获取地址的经纬度信息 **/
geoCode(address) {
return new Promise(resolve => {
if (!geocoder) {
geocoder = new window.AMap.Geocoder();
}
geocoder.getLocation(address, (status, result) => {
if (status === 'complete' && result.geocodes.length) {
const lnglat = result.geocodes[0].location;
resolve(lnglat);
} else {
console.warn('根据地址查询位置失败：' + address);
}
});
});
},
/** @name 绘制热力地图 **/
async drawHeatMap() {
// 最大值
let max = 0;
// 转化热力需要的数据格式
const heatData = [];
for (const [index, address] of data.entries()) {
// 寻找最大值
if (max < address.count) {
max = address.count;
}
// 经纬度
let center = [address.lng, address.lat];
// 兼容缺失经纬度坐标的数据
if (!center[0] || !center[1]) {
// 前端通过高德API自行查经纬度
const result = await this.geoCode(address.append);
center = [result.lng, result.lat];
// 如果还是查不到经纬度，就放弃这个点
if (!center[0] || !center[1]) continue;
}
if (center[0] && center[1]) {
heatData.push({
lng: +center[0],
lat: +center[1],
count: address.count,
});
}
}
const densityInstance = new window.AMap.HeatMap(this.map, {
radius: 25,
opacity: [0, 0.8],
// 由外向内
gradient: {
0.2: 'blue',
0.4: 'rgb(117, 211, 248)',
0.6: 'rgb(0, 255, 0)',
0.8: '#ffea00',
1.0: 'red',
},
zIndex: 1,
});
densityInstance.setDataSet({
data: heatData,
max,
});
},
}
}
</script>
<style scoped>
#container {
width: 740px;
height: 500px;
}
</style>
注意，data.js 文件数据与前面两篇文章中的数据有所变化。
AMap.HeatMap 对象使用起来还是挺简单方便的，仅需要把数据转换成合适的结构丢进去就行了，上面可能唯一比较让人觉得不懂的是 count 与 max 参数代表着什么意思？
count：权重，可以简单理解为每条数据对比的那个字段值。max：权重的最大值，max可以不填，会默认取数据集count的最大值。
绑定交互事件
仅仅绘制静态的热力图还不能满足我们实际的业务需求（可恨的产品经理￣へ￣），还需要我们给这个热力图添加交互效果，例如以下的效果：
看着好像也挺简单？但由于高德地图对于热力图是不支持任何事件绑定监听的，这就需要绕点弯路了。
在上一篇文章中，我们学会了绘制散点并给它们绑定事件交互，只要将该功能迁移过来就行啦(✪ω✪)。so easy !!!
我们来看看具体的编码过程：
<script>
import AMapLoader from "@amap/amap-jsapi-loader";
import data from "./data.js";
let scatterInstanceAll = [];
export default {
...,
methods: {
...,
/** @name 绘制热力地图 **/
async drawHeatMap() {
let max = 0;
const heatData = [];
for (const [index, address] of data.entries()) {
if (max < address.count) {
max = address.count;
}
let center = [address.lng, address.lat];
if (!center[0] || !center[1]) {
const result = await this.geoCode(address.append);
center = [result.lng, result.lat];
if (!center[0] || !center[1]) continue;
}
if (center[0] && center[1]) {
heatData.push({
lng: +center[0],
lat: +center[1],
count: address.count,
});
// 绘制散点
const scatterInstance = new window.AMap.CircleMarker({
center,
radius: 6,
zIndex: index,
strokeWeight: 1,
strokeColor: '#FFFFFF',
strokeOpacity: 0,
fillColor: 'blue',
fillOpacity: 0,
cursor: 'pointer',
clickable: true,
extData: {
index,
address,
},
});
scatterInstance.setMap(this.map);
scatterInstanceAll.push(scatterInstance);
scatterInstance.on('mouseover', e => {
const extData = e.target._opts.extData;
// DOTO: 其他业务逻辑
scatterInstanceAll[extData.index].setOptions({
zIndex: scatterInstanceAll.length + 10,
strokeOpacity: 1,
fillOpacity: 0.8,
});
});
scatterInstance.on('mouseout', e => {
const extData = e.target._opts.extData;
// DOTO: 其他业务逻辑
scatterInstanceAll[extData.index].setOptions({
zIndex: extData.index,
strokeOpacity: 0,
fillOpacity: 0,
});
});
}
}
const densityInstance = new window.AMap.HeatMap(this.map, {
radius: 25,
opacity: [0, 0.8],
gradient: {
0.2: 'blue',
0.4: 'rgb(117, 211, 248)',
0.6: 'rgb(0, 255, 0)',
0.8: '#ffea00',
1.0: 'red',
},
zIndex: 1,
});
densityInstance.setDataSet({
data: heatData,
max,
});
},
}
}
</script>
上面小编把绘制过程与事件监听过程写上去了，至于其他业务交互逻辑就看你实际需求来完善了。
工具栏操作
接下来，我们再来完成一个工具栏的小功能作为结尾，直接随小编来看代码：
<template>
<div class="map">
<div id="container" />
<div class="tool-nav">
<div @click="toolClick('enlarge')" class="nav-item" title="放大">
<svg t="1691484120795" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5104" width="32" height="32"><path d="M640 456h-118.4V320a32 32 0 0 0-64 0v136H320a32 32 0 0 0 0 64h137.6V640a32 32 0 1 0 64 0v-120H640a32 32 0 1 0 0-64z" p-id="5105"></path><path d="M919.264 905.984l-138.912-138.912C851.808 692.32 896 591.328 896 480c0-229.376-186.624-416-416-416S64 250.624 64 480s186.624 416 416 416c95.008 0 182.432-32.384 252.544-86.208l141.44 141.44a31.904 31.904 0 0 0 45.248 0 32 32 0 0 0 0.032-45.248zM128 480C128 285.92 285.92 128 480 128s352 157.92 352 352-157.92 352-352 352S128 674.08 128 480z" p-id="5106"></path></svg>
</div>
<div @click="toolClick('reduce')" class="nav-item" title="缩小">
<svg t="1691484136916" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="6088" width="32" height="32"><path d="M919.264 905.984l-138.912-138.912C851.808 692.32 896 591.328 896 480c0-229.376-186.624-416-416-416S64 250.624 64 480s186.624 416 416 416c95.008 0 182.432-32.384 252.544-86.208l141.44 141.44a31.904 31.904 0 0 0 45.248 0 32 32 0 0 0 0.032-45.248zM128 480C128 285.92 285.92 128 480 128s352 157.92 352 352-157.92 352-352 352S128 674.08 128 480z" p-id="6089"></path><path d="M625.792 448H336a32 32 0 0 0 0 64h289.792a32 32 0 1 0 0-64z" p-id="6090"></path></svg>
</div>
<div @click="toolClick('fixed')" class="nav-item" title="固定">
<svg t="1691484253704" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="8498" width="32" height="32"><path d="M935.15 375.34c0-25.38-9.88-49.23-27.83-67.17L727.96 128.8c-37.04-37.04-97.31-37.04-134.35 0L338.53 383.89l-72.74-30.44c-35.71-14.94-76.48-6.91-103.85 20.46l-38.15 38.15c-37.04 37.04-37.04 97.31 0 134.35L282 704.62 127.5 859.13c-13.67 13.67-13.67 35.83 0 49.5 6.83 6.83 15.79 10.25 24.75 10.25s17.92-3.42 24.75-10.25l154.5-154.51 158.21 158.21c17.94 17.94 41.8 27.83 67.18 27.83s49.23-9.88 67.17-27.83l38.15-38.15c27.37-27.37 35.4-68.14 20.46-103.85l-30.44-72.74L907.32 442.5c17.95-17.93 27.83-41.79 27.83-67.16z m-77.33 17.67l-262.2 262.2c-15.85 15.85-20.5 39.45-11.85 60.12l34.32 82.02c3.93 9.4 1.82 20.13-5.38 27.33l-38.15 38.15c-4.72 4.72-11 7.32-17.68 7.32s-12.96-2.6-17.68-7.32L173.29 496.91c-9.75-9.75-9.75-25.61 0-35.36l38.15-38.15c4.8-4.8 11.16-7.34 17.65-7.34 3.25 0 6.54 0.64 9.68 1.95l82.02 34.32c20.68 8.65 44.28 4 60.12-11.85l262.2-262.2c9.75-9.75 25.61-9.75 35.36 0l179.36 179.36c9.74 9.77 9.74 25.63-0.01 35.37z" p-id="8499"></path></svg>
</div>
<div @click="toolClick('reset')" v-if="isZoomed" class="nav-item" title="重置">
<svg t="1691484362015" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="14076" width="32" height="32"><path d="M943.8 484.1c-17.5-13.7-42.8-10.7-56.6 6.8-5.7 7.3-8.5 15.8-8.6 24.4h-0.4c-0.6 78.3-26.1 157-78 223.3-124.9 159.2-356 187.1-515.2 62.3-31.7-24.9-58.2-54-79.3-85.9h77.1c22.4 0 40.7-18.3 40.7-40.7v-3c0-22.4-18.3-40.7-40.7-40.7H105.5c-22.4 0-40.7 18.3-40.7 40.7v177.3c0 22.4 18.3 40.7 40.7 40.7h3c22.4 0 40.7-18.3 40.7-40.7v-73.1c24.2 33.3 53 63.1 86 89 47.6 37.3 101 64.2 158.9 79.9 55.9 15.2 113.5 19.3 171.2 12.3 57.7-7 112.7-24.7 163.3-52.8 52.5-29 98-67.9 135.3-115.4 37.3-47.6 64.2-101 79.9-158.9 10.2-37.6 15.4-76 15.6-114.6h-0.1c-0.3-11.6-5.5-23.1-15.5-30.9zM918.7 135.2h-3c-22.4 0-40.7 18.3-40.7 40.7V249c-24.2-33.3-53-63.1-86-89-47.6-37.3-101-64.2-158.9-79.9-55.9-15.2-113.5-19.3-171.2-12.3-57.7 7-112.7 24.7-163.3 52.8-52.5 29-98 67.9-135.3 115.4-37.3 47.5-64.2 101-79.9 158.8-10.2 37.6-15.4 76-15.6 114.6h0.1c0.2 11.7 5.5 23.2 15.4 30.9 17.5 13.7 42.8 10.7 56.6-6.8 5.7-7.3 8.5-15.8 8.6-24.4h0.4c0.6-78.3 26.1-157 78-223.3 124.9-159.2 356-187.1 515.2-62.3 31.7 24.9 58.2 54 79.3 85.9h-77.1c-22.4 0-40.7 18.3-40.7 40.7v3c0 22.4 18.3 40.7 40.7 40.7h177.3c22.4 0 40.7-18.3 40.7-40.7V175.8c0.1-22.3-18.2-40.6-40.6-40.6z" p-id="14077"></path></svg>
</div>
</div>
</div>
</template>
<script>
import AMapLoader from "@amap/amap-jsapi-loader";
import data from "./data.js";
let scatterInstanceAll = [];
const ZOOM = 3.8;
export default {
data() {
return {
// map:null,
zoom: ZOOM,
fixed: false,
};
},
computed: {
/** @name 是否缩放过 **/
isZoomed() {
return this.zoom !== ZOOM;
}
},
...,
methods: {
...,
/** @name 工具栏点击 **/
toolClick(flag) {
switch (flag) {
case 'enlarge':
this.zoom++;
this.map.setZoom(this.zoom);
break;
case 'reduce':
this.zoom--;
this.map.setZoom(this.zoom);
break;
case 'fixed':
this.fixed = !this.fixed;
this.map.setStatus({
doubleClickZoom: this.fixed,
scrollWheel: this.fixed,
});
break;
case 'reset':
this.zoom = ZOOM;
this.map.setZoom(this.zoom);
break;
}
},
}
}
</script>
<style scoped>
.map {
width: 740px;
height: 500px;
position: relative;
display: flex;
justify-content: flex-start;
align-items: flex-start;
}
#container {
width: 100%;
height: 100%;
}
.tool-nav {
position: absolute;
right: 12px;
bottom: 12px;
display: flex;
}
.nav-item {
width: 30px;
height: 30px;
border-radius: 4px;
background-color: rgba(0, 0, 0, 0.5);
margin-left: 12px;
cursor: pointer;
display: flex;
justify-content: center;
align-items: center;
line-height: 1;
font-size: 17px;
fill: #fff;
}
.nav-item .icon {
width: 20px;
height: 20px;
}
</style>
完整源码
至此，本篇文章就写完啦，撒花撒花。
希望本文对你有所帮助，如有任何疑问，期待你的留言哦。 老样子，点赞+评论=你会了，收藏=你精通了。
转载自:https://juejin.cn/post/7267473295599222838