1 //轉換常數

  2     var x_pi = 3.14159265358979324 * 3000.0 / 180.0;

  3     var pi = 3.14159265358979324;

  4     var a = 6378245.0;

  5     var ee = 0.00669342162296594323;

  6

  7     function transformLon(x, y) {

  8         var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));

  9         ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;

 10         ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;

 11         ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;

 12         return ret;

 13     };

 14

 15     function transformLat(x, y) {

 16         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));

 17         ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;

 18         ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;

 19         ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;

 20         return ret;

 21     }

 22

 23     function outOfChina(lat, lon) {

 24         if (lon < 72.004 || lon > 137.8347)

 25             return true;

 26         if (lat < 0.8293 || lat > 55.8271)

 27             return true;

 28         return false;

 29     }

 30

 31 /*

 32  * WGS-84：是國際標準，GPS座標（Google Earth使用、或者GPS模組、天地圖）

 33  * GCJ-02：中國座標偏移標準，Google Map、高德、騰訊使用

 34  * BD-09：百度座標偏移標準，Baidu Map使用

 35 */

 36

 37     /**

 38      * wgLat 緯度

 39      * wgLon 經度

 40      * WGS-84 到 GCJ-02 的轉換（即 GPS 加偏）

 41      * */

 42     function wgs_gcj_encrypts(wgLat, wgLon) {

 43         var point={};

 44         if (outOfChina(wgLat, wgLon)) {

 45             point.lat=wgLat;

 46             point.lng=wgLon;

 47             return point;

 48         }

 49         var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);

 50         var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);

 51         var radLat = wgLat / 180.0 * pi;

 52         var magic = Math.sin(radLat);

 53         magic = 1 - ee * magic * magic;

 54         var sqrtMagic = Math.sqrt(magic);

 55         dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);

 56         dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);

 57         var lat = wgLat + dLat;

 58         var lon = wgLon + dLon;

 59         point.lat=lat;

 60         point.lon=lon;

 61         return point;

 62     };

 63

 64

 65     /**

 66      * wgLat 緯度

 67      * wgLon 經度

 68      * BD-09轉換GCJ-02

 69      * 百度轉google

 70      * */

 71     function bd_google_encrypt(bd_lat, bd_lon){

 72         var point={};

 73         var x = bd_lon - 0.0065;

 74         var y = bd_lat - 0.006;

 75         var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);

 76         var theta =Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);

 77         var gg_lon = z * Math.cos(theta);

 78         var gg_lat = z * Math.sin(theta);

 79         point.lat=gg_lat;

 80         point.lon=gg_lon;

 81         return point;

 82     };

 83

 84

 85     /**

 86      * gg_lat 緯度

 87      * gg_lon 經度

 88      * GCJ-02轉換BD-09

 89      * Google地圖經緯度轉百度地圖經緯度

 90      * */

 91     function google_bd_encrypt(gg_lat, gg_lon){

 92         var point={};

 93         var x = gg_lon;

 94         var y = gg_lat;

 95         var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);

 96         var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);

 97         var bd_lon = z * Math.cos(theta) + 0.0065;

 98         var bd_lat = z * Math.sin(theta) + 0.006;

 99         point.lat=bd_lat;

100         point.lon=bd_lon;

101         return point;

102     };

 1    //從伺服器獲取的（硬體/谷歌）的經緯度

 2         lngMy = Number(dataLocker.gps.lng);

 3         latMy = Number(dataLocker.gps.lat);

 4

 5         //呼叫上面程式碼中的wgs_gcj_encrypts方法轉成高德的經緯度

 6         var point = wgs_gcj_encrypts(latMy,lngMy);

 7

 8        //重新整理展示的手機端的高德地圖上

 9         latMy = point.lat.toFixed(6);

10         lngMy = point.lon.toFixed(6);

11         reLocate();