百度地图显示热力图

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我是靠谱客的博主香蕉黑夜，最近开发中收集的这篇文章主要介绍百度地图显示热力图，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <script type="text/javascript" src="//api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>
    <script type="text/javascript" src="//api.map.baidu.com/library/Heatmap/2.0/src/Heatmap_min.js"></script>
    <title>热力图功能示例</title>
    <style type="text/css">
		ul,li{list-style: none;margin:0;padding:0;float:left;}
		html{height:100%}
		body{height:100%;margin:0px;padding:0px;font-family:"微软雅黑";}
		#container{height:500px;width:100%;}
		#r-result{width:100%;}
    </style>	
</head>
<body>
	<div id="container"></div>
	<div id="r-result">
		<input type="button"  onclick="openHeatmap();" value="显示热力图"/><input type="button"  onclick="closeHeatmap();" value="关闭热力图"/>
	</div>
</body>
</html>
<script type="text/javascript">
    var map = new BMap.Map("container");          // 创建地图实例

    var point = new BMap.Point(116.418261, 39.921984);
    map.centerAndZoom(point, 15);             // 初始化地图，设置中心点坐标和地图级别
    map.enableScrollWheelZoom(); // 允许滚轮缩放
  
    var points =[
    {"lng":116.418261,"lat":39.921984,"count":50},
    {"lng":116.423332,"lat":39.916532,"count":51},
    {"lng":116.419787,"lat":39.930658,"count":15},
    {"lng":116.418455,"lat":39.920921,"count":40},
    {"lng":116.418843,"lat":39.915516,"count":100},
    {"lng":116.42546,"lat":39.918503,"count":6},
    {"lng":116.423289,"lat":39.919989,"count":18},
    {"lng":116.418162,"lat":39.915051,"count":80},
    {"lng":116.422039,"lat":39.91782,"count":11},
    {"lng":116.41387,"lat":39.917253,"count":7},
    {"lng":116.41773,"lat":39.919426,"count":42},
    {"lng":116.421107,"lat":39.916445,"count":4},
    {"lng":116.417521,"lat":39.917943,"count":27},
    {"lng":116.419812,"lat":39.920836,"count":23},
    {"lng":116.420682,"lat":39.91463,"count":60},
    {"lng":116.415424,"lat":39.924675,"count":8},
    {"lng":116.419242,"lat":39.914509,"count":15},
    {"lng":116.422766,"lat":39.921408,"count":25},
    {"lng":116.421674,"lat":39.924396,"count":21},
    {"lng":116.427268,"lat":39.92267,"count":1},
    {"lng":116.417721,"lat":39.920034,"count":51},
    {"lng":116.412456,"lat":39.92667,"count":7},
    {"lng":116.420432,"lat":39.919114,"count":11},
    {"lng":116.425013,"lat":39.921611,"count":35},
    {"lng":116.418733,"lat":39.931037,"count":22},
    {"lng":116.419336,"lat":39.931134,"count":4},
    {"lng":116.413557,"lat":39.923254,"count":5},
    {"lng":116.418367,"lat":39.92943,"count":3},
    {"lng":116.424312,"lat":39.919621,"count":100},
    {"lng":116.423874,"lat":39.919447,"count":87},
    {"lng":116.424225,"lat":39.923091,"count":32},
    {"lng":116.417801,"lat":39.921854,"count":44},
    {"lng":116.417129,"lat":39.928227,"count":21},
    {"lng":116.426426,"lat":39.922286,"count":80},
    {"lng":116.421597,"lat":39.91948,"count":32},
    {"lng":116.423895,"lat":39.920787,"count":26},
    {"lng":116.423563,"lat":39.921197,"count":17},
    {"lng":116.417982,"lat":39.922547,"count":17},
    {"lng":116.426126,"lat":39.921938,"count":25},
    {"lng":116.42326,"lat":39.915782,"count":100},
    {"lng":116.419239,"lat":39.916759,"count":39},
    {"lng":116.417185,"lat":39.929123,"count":11},
    {"lng":116.417237,"lat":39.927518,"count":9},
    {"lng":116.417784,"lat":39.915754,"count":47},
    {"lng":116.420193,"lat":39.917061,"count":52},
    {"lng":116.422735,"lat":39.915619,"count":100},
    {"lng":116.418495,"lat":39.915958,"count":46},
    {"lng":116.416292,"lat":39.931166,"count":9},
    {"lng":116.419916,"lat":39.924055,"count":8},
    {"lng":116.42189,"lat":39.921308,"count":11},
    {"lng":116.413765,"lat":39.929376,"count":3},
    {"lng":116.418232,"lat":39.920348,"count":50},
    {"lng":116.417554,"lat":39.930511,"count":15},
    {"lng":116.418568,"lat":39.918161,"count":23},
    {"lng":116.413461,"lat":39.926306,"count":3},
    {"lng":116.42232,"lat":39.92161,"count":13},
    {"lng":116.4174,"lat":39.928616,"count":6},
    {"lng":116.424679,"lat":39.915499,"count":21},
    {"lng":116.42171,"lat":39.915738,"count":29},
    {"lng":116.417836,"lat":39.916998,"count":99},
    {"lng":116.420755,"lat":39.928001,"count":10},
    {"lng":116.414077,"lat":39.930655,"count":14},
    {"lng":116.426092,"lat":39.922995,"count":16},
    {"lng":116.41535,"lat":39.931054,"count":15},
    {"lng":116.413022,"lat":39.921895,"count":13},
    {"lng":116.415551,"lat":39.913373,"count":17},
    {"lng":116.421191,"lat":39.926572,"count":1},
    {"lng":116.419612,"lat":39.917119,"count":9},
    {"lng":116.418237,"lat":39.921337,"count":54},
    {"lng":116.423776,"lat":39.921919,"count":26},
    {"lng":116.417694,"lat":39.92536,"count":17},
    {"lng":116.415377,"lat":39.914137,"count":19},
    {"lng":116.417434,"lat":39.914394,"count":43},
    {"lng":116.42588,"lat":39.922622,"count":27},
    {"lng":116.418345,"lat":39.919467,"count":8},
    {"lng":116.426883,"lat":39.917171,"count":3},
    {"lng":116.423877,"lat":39.916659,"count":34},
    {"lng":116.415712,"lat":39.915613,"count":14},
    {"lng":116.419869,"lat":39.931416,"count":12},
    {"lng":116.416956,"lat":39.925377,"count":11},
    {"lng":116.42066,"lat":39.925017,"count":38},
    {"lng":116.416244,"lat":39.920215,"count":91},
    {"lng":116.41929,"lat":39.915908,"count":54},
    {"lng":116.422116,"lat":39.919658,"count":21},
    {"lng":116.4183,"lat":39.925015,"count":15},
    {"lng":116.421969,"lat":39.913527,"count":3},
    {"lng":116.422936,"lat":39.921854,"count":24},
    {"lng":116.41905,"lat":39.929217,"count":12},
    {"lng":116.424579,"lat":39.914987,"count":57},
    {"lng":116.42076,"lat":39.915251,"count":70},
    {"lng":116.425867,"lat":39.918989,"count":8}];
   
    if(!isSupportCanvas()){
    	alert('热力图目前只支持有canvas支持的浏览器,您所使用的浏览器不能使用热力图功能~')
    }
	//详细的参数,可以查看heatmap.js的文档 https://github.com/pa7/heatmap.js/blob/master/README.md
	//参数说明如下:
	/* visible 热力图是否显示,默认为true
     * opacity 热力的透明度,1-100
     * radius 势力图的每个点的半径大小   
     * gradient  {JSON} 热力图的渐变区间 . gradient如下所示
     *	{
			.2:'rgb(0, 255, 255)',
			.5:'rgb(0, 110, 255)',
			.8:'rgb(100, 0, 255)'
		}
		其中 key 表示插值的位置, 0~1. 
		    value 为颜色值. 
     */
	heatmapOverlay = new BMapLib.HeatmapOverlay({"radius":20});
	map.addOverlay(heatmapOverlay);
	heatmapOverlay.setDataSet({data:points,max:100});
	//是否显示热力图
    function openHeatmap(){
        heatmapOverlay.show();
    }
	function closeHeatmap(){
        heatmapOverlay.hide();
    }
	closeHeatmap();
    function setGradient(){
     	/*格式如下所示:
		{
	  		0:'rgb(102, 255, 0)',
	 	 	.5:'rgb(255, 170, 0)',
		  	1:'rgb(255, 0, 0)'
		}*/
     	var gradient = {};
     	var colors = document.querySelectorAll("input[type='color']");
     	colors = [].slice.call(colors,0);
     	colors.forEach(function(ele){
			gradient[ele.getAttribute("data-key")] = ele.value; 
     	});
        heatmapOverlay.setOptions({"gradient":gradient});
    }
	//判断浏览区是否支持canvas
    function isSupportCanvas(){
        var elem = document.createElement('canvas');
        return !!(elem.getContext && elem.getContext('2d'));
    }
</script>