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  • leaflet简单操作demo

    今天大意了解了一下leaflet这个开源的 JavaScript 库,很强大。

    结合腾讯地图,做了个简单的demo,作为一个学习的起点吧(各种API结合自身的业务)

    <!DOCTYPE html>
    <html>
    <head>
        <title>map</title>
    </head>
    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
    <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
    <style type="text/css">
        /*确定map容器的高度,宽度*/
        #map { height: 640px; width: 320px; }
    </style>
    <body>
    <!-- 地图容器 -->
    <div id="map"></div>
    <script type="text/javascript">
        //加载gis地图
        var southWest = [22.53491493,113.96075249],//地图西南点坐标
            northEast = [22.5587753,113.99362564],//地图东北点坐标
            bounds = L.latLngBounds(southWest, northEast);//地图边界
    
        //####设置地图设置地图中心和缩放级别
        var map = L.map('map',{
            zoomControl: false, //隐藏默认缩放按钮
             attributionControl: false,//隐藏copyright
             //center: new L.LatLng("22.54185077705975", "113.9806441116333"),//加载地图的中心点
            //zoom: "16",//默认显示层级
             maxBounds: bounds,//地图的边界
            maxZoom:"20",//最大显示层级
            minZoom:"1",//最小显示层级
             attribution: 'Map data &copy; <a href="http://www.cnblogs.com/liugx/p/7651379.html">szliugx</a>',//添加copyright,无效(已经禁用)
        }).setView(["22.54185077705975", "113.9806441116333"], 16);//默认显示16层级,设置默认加载中心点经纬度
    
    
        //####添加标注、圆形、多边形
        //添加标注
        var marker = L.marker([22.54383, 113.98049]).addTo(map);
        marker.bindPopup("<b>Hello world!</b><br>这是一个湖").openPopup();
    
        //#####添加圆形
        var circle = L.circle([22.5363, 113.98069], 50, {
         color: 'red',
         fillColor: '#f03',
         fillOpacity: 0.5
        }).addTo(map);
        //circle.bindPopup("这是圈圈").openPopup();
    
        // //#####添加多边形
        var polygon = L.polygon([
         [22.54784, 113.97779],
         [22.54685, 113.98079],
         [22.54649, 113.97899]
        ]).addTo(map);
        //polygon.bindPopup("土豪聚集地").openPopup();;
    
       //#####添加弹出气泡
       //xxx.bindPopup("xxx").openPopup();;
         
        //#####处理事件
        function onMapClick(e) {
         alert("You clicked the map at " + e.latlng);
        }
        map.on('click', onMapClick);
    
    
        L.TileLayer.WebDogTileLayer = L.TileLayer.extend({
            getTileUrl: function (tilePoint) {
                var urlArgs,
                    getUrlArgs = this.options.getUrlArgs;
    
                if (getUrlArgs) {
                    var urlArgs = getUrlArgs(tilePoint);
                } else {
                    urlArgs = {
                        z: tilePoint.z,
                        x: tilePoint.x,
                        y: tilePoint.y
                    };
                }
    
                return L.Util.template(this._url, L.extend(urlArgs, this.options, {s: this._getSubdomain(tilePoint)}));
            }
        });
    
        L.tileLayer.webdogTileLayer = function (url, options) {
            return new L.TileLayer.WebDogTileLayer(url, options);
        };
    
        var url = 'http://rt{s}.map.gtimg.com/realtimerender?z={z}&x={x}&y={y}&type=vector&style=0';
            options = {
                //分布式域名前缀标识
                subdomains: '012',
                //重写腾讯地图的瓦片图规则
                getUrlArgs: function (tilePoint) {
                    return {
                        z: tilePoint.z,
                        x: tilePoint.x,
                        y: Math.pow(2, tilePoint.z) - 1 - tilePoint.y
                    };
                }        
            };
        //L.tileLayer就是矢量瓦片底图,用对应的URL上找对应的z,y,x。而s是分布式服务器快速选取。最后,tileLayer图层要addTo(map)加载在地图观察器上。    
        L.tileLayer.webdogTileLayer(url, options).addTo(map);
    
    </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/liugx/p/7652435.html
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