<!DOCTYPE html>
<html lang="en">
<head>
<!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="http://api.map.baidu.com/api?v=2.0&ak=vN5VO8968DYOBd28UNSxQSlC4V83Rc5"></script>
<script type="text/javascript" src="http://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">
#container{height:207px;179px;}
</style>
</head>
<body>
<div id="container"></div>
</body>
</html>
<script type="text/javascript">
var map = new BMap.Map("container"); // 创建地图实例
var point = new BMap.Point(108.25, 33.05);
map.centerAndZoom(point, 9); // 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
//石泉老街 108.25281,33.04371
//燕翔洞 108.160726,32.800537
//子午银滩 108.07572,33.272254
//中坝大峡谷 108.138825,32.918189
//后柳水乡 108.230534,32.937468
//熨斗古镇 108.169116,32.802236
var points =[
{"lng":"108.25281","lat":"33.04371","count":"10123456778"},
{"lng":"108.160726","lat":"32.800537","count":"23450"},
{"lng":"108.07572","lat":"33.272254","count":"23450"},
{"lng":"108.138825","lat":"32.918189","count":"230"},
{"lng":"108.230534","lat":"32.937468","count":"234560"},
{"lng":"108.169116","lat":"32.802236","count":"23450"},
];
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});
closeHeatmap();
//判断浏览区是否支持canvas
function isSupportCanvas(){
var elem = document.createElement('canvas');
return !!(elem.getContext && elem.getContext('2d'));
}
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});
}
heatmapOverlay.show();
</script>