if (L.Proj) {
  L.CRS.Baidu = new L.Proj.CRS('EPSG:900913', '+proj=merc +a=6378206 +b=6356584.314245179 +lat_ts=0.0 +lon_0=0.0 +x_0=0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs', {
      resolutions: function () {
          var level = 19
          var res = [];
          res[0] = Math.pow(2, 18);
          for (var i = 1; i < level; i++) {
              res[i] = Math.pow(2, (18 - i))
          }
          return res;
      }(),
      origin: [0, 0],
      bounds: L.bounds([20037508.342789244, 0], [0, 20037508.342789244])
  });
}

L.TileLayer.ChinaProvider = L.TileLayer.extend({

  initialize: function(type, options) { // (type, Object)
      var providers = L.TileLayer.ChinaProvider.providers;

      options = options || {}

      var parts = type.split('.');

      var providerName = parts[0];
      var mapName = parts[1];
      var mapType = parts[2];

      var url = providers[providerName][mapName][mapType];
      options.subdomains = providers[providerName].Subdomains;
      options.key = options.key || providers[providerName].key;

      if ('tms' in providers[providerName]) {
          options.tms = providers[providerName]['tms']
      }

      L.TileLayer.prototype.initialize.call(this, url, options);
  },

  getTileUrl: function (coords) {
  var data = {
    s: this._getSubdomain(coords),
    x: coords.x,
    y: coords.y,
    z: this._getZoomForUrl(),
  };
  if (this._map && !this._map.options.crs.infinite) {
    var invertedY = this._globalTileRange.max.y - coords.y;
    if (this.options.tms) {
      data['y'] = invertedY;
    }
    data['-y'] = invertedY;
  }

      data.sx = data.x >> 4
      data.sy = (( 1 << data.z) - data.y) >> 4

  return L.Util.template(this._url, L.Util.extend(data, this.options));
},
});

L.TileLayer.ChinaProvider.providers = {
  TianDiTu: {
      Normal: {
          Map: "//t{s}.tianditu.gov.cn/DataServer?T=vec_w&X={x}&Y={y}&L={z}&tk={key}",
          Annotion: "//t{s}.tianditu.gov.cn/DataServer?T=cva_w&X={x}&Y={y}&L={z}&tk={key}"
      },
      Satellite: {
          Map: "//t{s}.tianditu.gov.cn/DataServer?T=img_w&X={x}&Y={y}&L={z}&tk={key}",
          Annotion: "//t{s}.tianditu.gov.cn/DataServer?T=cia_w&X={x}&Y={y}&L={z}&tk={key}"
      },
      Terrain: {
          Map: "//t{s}.tianditu.gov.cn/DataServer?T=ter_w&X={x}&Y={y}&L={z}&tk={key}",
          Annotion: "//t{s}.tianditu.gov.cn/DataServer?T=cta_w&X={x}&Y={y}&L={z}&tk={key}"
      },
      Subdomains: ['0', '1', '2', '3', '4', '5', '6', '7'],
      key: "174705aebfe31b79b3587279e211cb9a"
  },

  GaoDe: {
      Normal: {
          Map: '//webrd0{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}'
      },
      Satellite: {
          Map: '//webst0{s}.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}',
          Annotion: '//webst0{s}.is.autonavi.com/appmaptile?style=8&x={x}&y={y}&z={z}'
      },
      Subdomains: ["1", "2", "3", "4"]
  },

  Google: {
      Normal: {
          Map: "//www.google.cn/maps/vt?lyrs=m@189&gl=cn&x={x}&y={y}&z={z}"
      },
      Satellite: {
          Map: "//www.google.cn/maps/vt?lyrs=s@189&gl=cn&x={x}&y={y}&z={z}",
          Annotion: "//www.google.cn/maps/vt?lyrs=y@189&gl=cn&x={x}&y={y}&z={z}"
      },
      Subdomains: []
  },

  Geoq: {
      Normal: {
          Map: "//map.geoq.cn/ArcGIS/rest/services/ChinaOnlineCommunity/MapServer/tile/{z}/{y}/{x}",
          PurplishBlue: "//map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}",
          Gray: "//map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetGray/MapServer/tile/{z}/{y}/{x}",
          Warm: "//map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetWarm/MapServer/tile/{z}/{y}/{x}",
      },
      Theme: {
          Hydro: "//thematic.geoq.cn/arcgis/rest/services/ThematicMaps/WorldHydroMap/MapServer/tile/{z}/{y}/{x}"
      },
      Subdomains: []
  },

  OSM: {
      Normal: {
          Map: "//{s}.tile.osm.org/{z}/{x}/{y}.png",
      },
      Subdomains: ['a', 'b', 'c']
  },

  Baidu: {
      Normal: {
          Map: '//online{s}.map.bdimg.com/onlinelabel/?qt=tile&x={x}&y={y}&z={z}&styles=pl&scaler=1&p=1'
      },
      Satellite: {
          Map: '//shangetu{s}.map.bdimg.com/it/u=x={x};y={y};z={z};v=009;type=sate&fm=46',
          Annotion: '//online{s}.map.bdimg.com/tile/?qt=tile&x={x}&y={y}&z={z}&styles=sl&v=020'
      },
      Subdomains: '0123456789',
      tms: true
  },

  Tencent: {
      Normal: {
          Map: "//rt{s}.map.gtimg.com/tile?z={z}&x={x}&y={-y}&type=vector&styleid=3",
      },
      Satellite: {
          Map: "//p{s}.map.gtimg.com/sateTiles/{z}/{sx}/{sy}/{x}_{-y}.jpg",
      },
      Terrain: {
          Map: "//p{s}.map.gtimg.com/demTiles/{z}/{sx}/{sy}/{x}_{-y}.jpg"
      },
      Subdomains: '0123',
  }

};

L.tileLayer.chinaProvider = function(type, options) {
  return new L.TileLayer.ChinaProvider(type, options);
};

//坐标转换
L.CoordConver = function () {

    /**百度转84*/
    this.bd09_To_gps84 = function(lng, lat) {
        var gcj02 = this.bd09_To_gcj02(lng, lat);
        var map84 = this.gcj02_To_gps84(gcj02.lng, gcj02.lat);
        return map84;
    }
    /**84转百度*/
    this.gps84_To_bd09 = function (lng, lat) {
        var gcj02 = this.gps84_To_gcj02(lng, lat);
        var bd09 = this.gcj02_To_bd09(gcj02.lng, gcj02.lat);
        return bd09;
    }
    /**84转火星*/
    this.gps84_To_gcj02 = function (lng, lat) {
        var dLat = transformLat(lng - 105.0, lat - 35.0);
        var dLng = transformLng(lng - 105.0, lat - 35.0);
        var radLat = lat / 180.0 * pi;
        var magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        var sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLng = (dLng * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        var mgLat = lat + dLat;
        var mgLng = lng + dLng;
        var newCoord = {
            lng: mgLng,
            lat: mgLat
        };
        return newCoord;
    }
    /**火星转84*/
    this.gcj02_To_gps84 = function (lng, lat) {
        var coord = transform(lng, lat);
        var lontitude = lng * 2 - coord.lng;
        var latitude = lat * 2 - coord.lat;
        var newCoord = {
            lng: lontitude,
            lat: latitude
        };
        return newCoord;
    }
    /**火星转百度*/
    this.gcj02_To_bd09 = function (x, y) {
        var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        var bd_lng = z * Math.cos(theta) + 0.0065;
        var bd_lat = z * Math.sin(theta) + 0.006;
        var newCoord = {
            lng: bd_lng,
            lat: bd_lat
        };
        return newCoord;
    }
    /**百度转火星*/
    this.bd09_To_gcj02 = function (bd_lng, bd_lat) {
        var x = bd_lng - 0.0065;
        var y = bd_lat - 0.006;
        var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        var gg_lng = z * Math.cos(theta);
        var gg_lat = z * Math.sin(theta);
        var newCoord = {
            lng: gg_lng,
            lat: gg_lat
        };
        return newCoord;
    }

    var pi = 3.1415926535897932384626;
    var a = 6378245.0;
    var ee = 0.00669342162296594323;
    var x_pi = pi * 3000.0 / 180.0;
    var R = 6378137;

    function transform(lng, lat) {
        var dLat = transformLat(lng - 105.0, lat - 35.0);
        var dLng = transformLng(lng - 105.0, lat - 35.0);
        var radLat = lat / 180.0 * pi;
        var magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        var sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLng = (dLng * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        var mgLat = lat + dLat;
        var mgLng = lng + dLng;
        var newCoord = {
            lng: mgLng,
            lat: mgLat
        };
        return newCoord;
    }

    function transformLat(x, y) {
        var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    function transformLng(x, y) {
        var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }
}

L.coordConver = function () {
    return new L.CoordConver()
}


L.tileLayer.chinaProvider = function (type, options) {
    options = options || {}
    options.corrdType = getCorrdType(type);
    return new L.TileLayer.ChinaProvider(type, options);

    //获取坐标类型
    function getCorrdType(type) {
        var parts = type.split('.');
        var providerName = parts[0];
        var zbName = "wgs84"
        switch (providerName) {
            case "Tengxun":
            case "GaoDe":
            case "Pengjiang":
            case "GoogleCn": //google中国地图
            case "ArcgisCn":
            case "BingCn":
            case "Test":
                zbName = "gcj02";
                break;
            case "Baidu":
                zbName = "bd09";
                break;
            case "Carto":
            case "Thunderforest":
            case "OSM":
            case "TianDiTu":
            case "Jl1":
            case "Openrailway":
            case "Bing":
            case "Jiangmen":
            case "Google":
            case "mapbox":
                zbName = "wgs84";
                break;
        }
        return zbName;
    }
};

L.GridLayer.include({
    _setZoomTransform: function (level, _center, zoom) {
        var center = _center;

        if (center != undefined && this.options) {
            if (this.options.corrdType == 'gcj02') {
                center = L.coordConver().gps84_To_gcj02(_center.lng, _center.lat);
            } else if (this.options.corrdType == 'bd09') {
                center = L.coordConver().gps84_To_bd09(_center.lng, _center.lat);
            }
        }


        var scale = this._map.getZoomScale(zoom, level.zoom),
            translate = level.origin.multiplyBy(scale)
                .subtract(this._map._getNewPixelOrigin(center, zoom)).round();

        if (L.Browser.any3d) {
            L.DomUtil.setTransform(level.el, translate, scale);
        } else {
            L.DomUtil.setPosition(level.el, translate);
        }

    },
    _getTiledPixelBounds: function (_center) {
        var center = _center;

        if (center != undefined && this.options) {
            if (this.options.corrdType == 'gcj02') {
                center = L.coordConver().gps84_To_gcj02(_center.lng, _center.lat);
            } else if (this.options.corrdType == 'bd09') {
                center = L.coordConver().gps84_To_bd09(_center.lng, _center.lat);
            }
        }

        var map = this._map,
            mapZoom = map._animatingZoom ? Math.max(map._animateToZoom, map.getZoom()) : map.getZoom(),
            scale = map.getZoomScale(mapZoom, this._tileZoom),
            pixelCenter = map.project(center, this._tileZoom).floor(),
            halfSize = map.getSize().divideBy(scale * 2);

        return new L.Bounds(pixelCenter.subtract(halfSize), pixelCenter.add(halfSize));

    }
})