Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *   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.
 */

public class Main {
    static double pi = 3.1415926535897932384626;
    static double a = 6378245.0;
    static double ee = 0.00669342162296594323;

    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 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;
    }

    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;
    }
}