content: /*
   *   Copyright (C)  2016 android@19code.com
   *
   *   Licensed under the Apache License, Version 2.0 (the "License");
   *   you may not use this file except in compliance with the License.
   *   You may obtain a copy of the License at
   *
   *       http://www.apache.org/licenses/LICENSE-2.0
   *
   *   Unless required by applicable law or agreed to in writing, software
   *   distributed under the License is distributed on an "AS IS" BASIS,
   *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *   See the License for the specific language governing permissions and
   *   limitations under the License.
   */
  
  package com.rsen.github.common;
  
  /**
   * https://github.com/wandergis/coordtransform javaScript Version
   */
  public class CoordinateTransformUtil {
      static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
      static double pi = 3.1415926535897932384626;
      static double a = 6378245.0;
      static double ee = 0.00669342162296594323;
  
      public static double[] bd09towgs84(double lng, double lat) {
          double[] gcj = bd09togcj02(lng, lat);
          double[] wgs84 = gcj02towgs84(gcj[0], gcj[1]);
          return wgs84;
      }
  
      public static double[] wgs84tobd09(double lng, double lat) {
          double[] gcj = wgs84togcj02(lng, lat);
          double[] bd09 = gcj02tobd09(gcj[0], gcj[1]);
          return bd09;
      }
  
      public static double[] gcj02tobd09(double lng, double lat) {
          double z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_pi);
          double theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_pi);
          double bd_lng = z * Math.cos(theta) + 0.0065;
          double bd_lat = z * Math.sin(theta) + 0.006;
          return new double[]{bd_lng, bd_lat};
      }
  
      public static double[] bd09togcj02(double bd_lon, double bd_lat) {
          double x = bd_lon - 0.0065;
          double y = bd_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);
          double gg_lng = z * Math.cos(theta);
          double gg_lat = z * Math.sin(theta);
          return new double[]{gg_lng, gg_lat};
      }
  
      public static double[] wgs84togcj02(double lng, double lat) {
          if (out_of_china(lng, lat)) {
              return new double[]{lng, lat};
          }
          double dlat = transformlat(lng - 105.0, lat - 35.0);
          double dlng = transformlng(lng - 105.0, lat - 35.0);
          double radlat = lat / 180.0 * pi;
          double magic = Math.sin(radlat);
          magic = 1 - ee * magic * magic;
          double sqrtmagic = Math.sqrt(magic);
          dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * pi);
          dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * pi);
          double mglat = lat + dlat;
          double mglng = lng + dlng;
          return new double[]{mglng, mglat};
      }
  
      public static double[] gcj02towgs84(double lng, double lat) {
          if (out_of_china(lng, lat)) {
              return new double[]{lng, lat};
          }
          double dlat = transformlat(lng - 105.0, lat - 35.0);
          double dlng = transformlng(lng - 105.0, lat - 35.0);
          double radlat = lat / 180.0 * pi;
          double magic = Math.sin(radlat);
          magic = 1 - ee * magic * magic;
          double sqrtmagic = Math.sqrt(magic);
          dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * pi);
          dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * pi);
          double mglat = lat + dlat;
          double mglng = lng + dlng;
          return new double[]{lng * 2 - mglng, lat * 2 - mglat};
      }
  
      public static double transformlat(double lng, double lat) {
          double ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
          ret += (20.0 * Math.sin(6.0 * lng * pi) + 20.0 * Math.sin(2.0 * lng * pi)) * 2.0 / 3.0;
          ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
          ret += (160.0 * Math.sin(lat / 12.0 * pi) + 320 * Math.sin(lat * pi / 30.0)) * 2.0 / 3.0;
          return ret;
      }
  
      public static double transformlng(double lng, double lat) {
          double ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
          ret += (20.0 * Math.sin(6.0 * lng * pi) + 20.0 * Math.sin(2.0 * lng * pi)) * 2.0 / 3.0;
          ret += (20.0 * Math.sin(lng * pi) + 40.0 * Math.sin(lng / 3.0 * pi)) * 2.0 / 3.0;
          ret += (150.0 * Math.sin(lng / 12.0 * pi) + 300.0 * Math.sin(lng / 30.0 * pi)) * 2.0 / 3.0;
          return ret;
      }
  
      public static boolean out_of_china(double lng, double lat) {
          if (lng < 72.004 || lng > 137.8347) {
              return true;
          } else if (lat < 0.8293 || lat > 55.8271) {
              return true;
          }
          return false;
      }
  }
  