腾讯地图坐标转百度地图

1 - java代码

/** 
     * 坐标转换，腾讯地图转换成百度地图坐标 
     * @param lat 腾讯纬度 
     * @param lon 腾讯经度 
     * @return 返回结果：经度,纬度 
     */  
    public String map_tx2bd(double lat, double lon){  
        double bd_lat;  
        double bd_lon;  
        double x_pi=3.14159265358979324;  
        double x = lon, y = lat;  
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);  
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);  
        bd_lon = z * Math.cos(theta) + 0.0065;  
        bd_lat = z * Math.sin(theta) + 0.006;  

        System.out.println("bd_lat:"+bd_lat);  
        System.out.println("bd_lon:"+bd_lon);  
        return bd_lon+","+bd_lat;  
    }  


    /** 
     * 坐标转换，百度地图坐标转换成腾讯地图坐标 
     * @param lat  百度坐标纬度 
     * @param lon  百度坐标经度 
     * @return 返回结果：纬度,经度 
     */  
    public String map_bd2tx(double lat, double lon){  
        double tx_lat;  
        double tx_lon;  
        double x_pi=3.14159265358979324;  
        double x = lon - 0.0065, y = lat - 0.006;  
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);  
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);  
        tx_lon = z * Math.cos(theta);  
        tx_lat = z * Math.sin(theta);  
        return tx_lat+","+tx_lon;  
    }