百度地图显示热力图

梦里梦外; 2023-08-17 17:03 157阅读 0赞

<!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},
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        {"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},
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        {"lng":116.419242,"lat":39.914509,"count":15},
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        {"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},
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        {"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>