百度热力图

var SGheadMapPoints = {
    /*obj={ maxLng: minLng: maxLat: minLat: maxCount:最大人数 minCount:最小人数 total:点位数量 }*/
    get: function (obj) {
        var arr = [];
        obj.maxCount || (obj.maxCount = 100);/*默认最大游客数量1000人*/
        obj.minCount || (obj.minCount = 0); /*默认最小游客数量0*/
        obj.total || (obj.total = 50);/*默认50个点位*/
        for (var i = 0, len = obj.total; i < len; i++) {
            arr.push({lng: random.getDecimal(obj.maxLng, obj.minLng), lat: random.getDecimal(obj.maxLat, obj.minLat), count: random.getInteger(obj.maxCount, obj.minCount)});
        }
        return arr;
    }
};

/*热力图*/
function showHeatMap() {
    function isSupportCanvas() {
        var elem = document.createElement("canvas");
        return !!(elem.getContext && elem.getContext("2d"));
    }

    isSupportCanvas() || alert("您所使用的浏览器不能使用热力图功能~");
    var dt = map._map;/*长期需要修改的参数*/
    var zoom = 15;/*地图放大比例尺*/
    var center = [119.913334, 30.247953];/*景区中心坐标*/
    var right_top_center = [119.975245, 30.287816];/*景区右上角坐标*/
    var left_bottom_center = [119.879235, 30.235411];/*景区左下角坐标*/
    var points = SGheadMapPoints.get({
        maxLng: right_top_center[0],
        minLng: left_bottom_center[0],
        maxLat: right_top_center[1],
        minLat: left_bottom_center[1],
        maxCount: 100,
        minCount: 0,
        total: 50
    });
    var point = new BMap.Point(center[0], center[1]);
    dt.centerAndZoom(point, zoom);
    dt.enableScrollWheelZoom();
    dt.setMapType(BMAP_SATELLITE_MAP);//加载百度默认卫星地图 
    dt.setMapStyle({style: 'midnight'});//高端黑、酷炫风格
    var rlt = new BMapLib.HeatmapOverlay({"radius": 20});
    dt.addOverlay(rlt),
        rlt.setDataSet({
            data: points,
            max: 10
        });/*max点位扩散程度（推荐10-100，值越小越聚拢）*/
}

showHeatMap();