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做地图开发，往往需要掌握专题地图制作的技能。今天用OpenLayers6来做一个热力图的效果。
页面效果：
代码部分:
<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>热力图</title>
<link rel="stylesheet" href="/css/ol.css">
<script src="/js/ol.js"></script>
<script src="heatmap.js"></script>
<script type="text/javascript">
window.onload = function () {map();}
</script>
<style>
#map{
position: fixed;
100%;
height: 100%;
}
</style>
</head>
<body>
<form style="position: absolute;left: 200px;z-index: 999;color: blue;">
<label>半径大小</label>
<input id="radius" type="range" min="1" max="50" step="1" value="20" />
<label>模糊大小</label>
<input id="blur" type="range" min="1" max="50" step="1" value="25" />
</form>
<div id="map"></div>
</body>
</html>
JavaScript部分：
/*
* heatmap.js
*/
var map1;
function map(){
map1 = new ol.Map({
target: 'map', //地图容器div的id
loadTilesWhileInteracting: true,
layers: [],
view: new ol.View({
center: [12622513, 2636878], //地图初始中心点
zoom: 9, //地图初始显示级别
}),
controls: ol.control.defaults({}).extend([])
});
// 开始做热力图相关功能
let blur = document.getElementById("blur");
let radius = document.getElementById("radius");
var wandaVector = new ol.source.Vector({
url: "/热力图/wanda.geojson",
format: new ol.format.GeoJSON()
});
//定义热力图图层
let vector = new ol.layer.Heatmap({
source: wandaVector,
blur: parseInt(blur.value, 10),
radius: parseInt(radius.value, 10),
});
// 模糊按钮的回调函数
let blurHandler = function (){
vector.setBlur(parseInt(blur.value, 10));
};
blur.addEventListener("input", blurHandler);
blur.addEventListener("change", blurHandler);
// 半径按钮的回调函数
let radiusHandler = function () {
vector.setRadius(parseInt( radius.value, 10));
};
radius.addEventListener("input", radiusHandler);
radius.addEventListener("change", radiusHandler);
//添加OSM地图作为底图
var osm = new ol.layer.Tile({
source: new ol.source.OSM()
});
map1.addLayer(osm);
map1.addLayer(vector);
}
数据部分：wanda.geojson
{
"type": "FeatureCollection",
"name": "wanda",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "name": "万达影城(增城万达广场店)", "lng": 113.821841, "lat": 23.281847, "address": "广州市增城区荔城街增城大道69号万达广场F4" }, "geometry": { "type": "Point", "coordinates": [ 113.821841, 23.281847 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(南沙万达广场店)", "lng": 113.538016, "lat": 22.800097, "address": "广州市南沙区双山大道3号万达广场4层" }, "geometry": { "type": "Point", "coordinates": [ 113.538016, 22.800097 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(万胜广场店)", "lng": 113.388917, "lat": 23.103397, "address": "广东省广州市海珠区新港东路1236号万胜广场五层" }, "geometry": { "type": "Point", "coordinates": [ 113.388917, 23.103397 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(融创茂店)", "lng": 113.240693, "lat": 23.431699, "address": "广州市花都区凤凰北路63号融创茂购物中心3楼" }, "geometry": { "type": "Point", "coordinates": [ 113.240693, 23.431699 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(广州番禺万达广场店)", "lng": 113.356523, "lat": 23.012651, "address": "广州市番禺区南村镇汉溪大道东389号番禺万达广场4层" }, "geometry": { "type": "Point", "coordinates": [ 113.356523, 23.012651 ] } },
{ "type": "Feature", "properties": { "name": "万达影城（广州海珠万达广场店）", "lng": 113.320582, "lat": 23.089375, "address": "广州市海珠区广州大道南978号601铺" }, "geometry": { "type": "Point", "coordinates": [ 113.320582, 23.089375 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(白云万达广场店)", "lng": 113.273067, "lat": 23.178271, "address": "广州市白云区云城东路503号万达广场娱乐楼三层" }, "geometry": { "type": "Point", "coordinates": [ 113.273067, 23.178271 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(盈熙广场店)", "lng": 113.293956, "lat": 23.07975, "address": "广州市海珠区江南大道南689-709号盈熙广场2层" }, "geometry": { "type": "Point", "coordinates": [ 113.293956, 23.07975 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(萝岗万达店)", "lng": 113.47294, "lat": 23.174362, "address": "广州市黄埔区开创大道与科丰路交汇处万达广场F4" }, "geometry": { "type": "Point", "coordinates": [ 113.47294, 23.174362 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(万科广场店)", "lng": 113.411133, "lat": 23.172774, "address": "广州市天河区华观路天河万科广场4层" }, "geometry": { "type": "Point", "coordinates": [ 113.411133, 23.172774 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(广州万达影城番禺奥园广场店)", "lng": 113.365178, "lat": 22.929663, "address": "广州市番禺区桥南街福德路281号奥园广场三楼万达影城" }, "geometry": { "type": "Point", "coordinates": [ 113.365178, 22.929663 ] } },
{ "type": "Feature", "properties": { "name": "万达影城(亚运城广场店)", "lng": 113.482628, "lat": 22.94697, "address": "广东省广州市番禺区石楼镇康体路43号亚运城广场3楼" }, "geometry": { "type": "Point", "coordinates": [ 113.482628, 22.94697 ] } },
{ "type": "Feature", "properties": { "name": "广州永和万达电影城(永和里享家店)", "lng": 113.574286, "lat": 23.201214, "address": "广东省广州市黄埔区新业路23号" }, "geometry": { "type": "Point", "coordinates": [ 113.574286, 23.201214 ] } },
{ "type": "Feature", "properties": { "name": "万达国际影城(广州新塘万达广场店)", "lng": 113.624387, "lat": 23.158623, "address": "广州市增城区新塘镇新福路9号新塘万达广场4F万达影城" }, "geometry": { "type": "Point", "coordinates": [ 113.624387, 23.158623 ] } },
{ "type": "Feature", "properties": { "name": "万达影城", "lng": 113.237061, "lat": 23.430949, "address": "广州市花都区蓝楹街融创茂" }, "geometry": { "type": "Point", "coordinates": [ 113.237061, 23.430949 ] } }
]
}
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