// 高德地图工具类
var MapUtil = {
    /**
     * 添加地图边界
     * <pre>
     * config:
     *      region: 行政区划代码
     *      areaName: 行政区划名称
     *      earecode: admin.earecode
     *
     * </pre>
     * @param {Object} map 高德地图 map 实例
     * @param {{ region:string,
     *          areaName:string,
     *          earecode:string}} config 配置
     */
    add_border: function (map, config) {
        var district;

        var areaDisLevel = config.earecode;
        var len = areaDisLevel.length;
        var areaName = '';
        if (len == 6) {
            areaDisLevel = 'district';
        } else if (len == 4) {
            areaDisLevel = 'city';
        } else {
            areaDisLevel = 'province';
            areaName = '河北省';
            config.areaName = areaName;
        }

        if (map != null) {
            var obj = MAP_BORDER_ARR[config.region];
            if (obj != null) {
                var polygon = new AMap.Polygon({
                    path: obj.borderArray,
                    fillColor: '#80d8ff', // 多边形填充颜色
                    strokeWeight: 5, // 线条宽度，默认为 1
                    fillOpacity: 0,
                    strokeColor: '#0091ea', // 线条颜色
                });

                map.add(polygon);
                if (obj.zoom) {
                    map.setZoom(10);
                }
                map.setCenter(obj.center);
            } else {
                var polygons = [];
                var name = config.areaName;
                AMap.service('AMap.DistrictSearch', function () {//回调函数
                    var opts = {
                        showbiz: false,
                        subdistrict: 0,   //获取边界不需要返回下级行政区
                        extensions: 'all'  //返回行政区边界坐标组等具体信息
                    };
                    district = new AMap.DistrictSearch(opts);
                    district.setLevel(areaDisLevel);//district、city、province、country
                    district.search(name, function (status, result) {
                        if (polygons == null || polygons.length == 0) {
                            map.remove(polygons); //清除上次结果
                            polygons = [];
                        }
                        var bounds = result.districtList[0].boundaries;
                        if (bounds) {
                            for (var i = 0, l = bounds.length; i < l; i++) {
                                //生成行政区划polygon
                                var polygon = new AMap.Polygon({
                                    strokeWeight: 5,
                                    path: bounds[i],
                                    fillOpacity: 0,
                                    fillColor: '#80d8ff',
                                    strokeColor: '#0091ea'
                                });
                                polygons.push(polygon);
                            }
                        }
                        map.add(polygons);
                        map.setFitView(polygons);//视口自适应
                    });
                });
            }

        }
    }
};