GeoPo Location Encode in Java. - Android Map

Android examples for Map:Location

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Description

GeoPo Location Encode in Java.

Demo Code

/* ------------------------------------------------------------------------
 * Copyright 2010, Handy Codeworks LLC/*from  ww  w  .ja  v a 2 s . co  m*/
 *
 * 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.java2s;

public class Main {
    /**
     * GeoPo Encode in Java.
     *
     * @param lat latitude
     * @param lng longnitude
     * @param scale scale of map
     * @return geopo code
     */
    public static String encode(double lat, double lng, int scale) {

        // 64characters (number + big and small letter + hyphen + underscore).
        final String chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_";

        StringBuffer geopo = new StringBuffer();

        lat = (lat + 90) / 180 * Math.pow(8, 10);
        lng = (lng + 180) / 360 * Math.pow(8, 10);

        for (int i = 0; i < scale; i++) {
            geopo.append(chars.charAt((int) (Math.floor(lat
                    / Math.pow(8, 9 - i) % 8) + Math.floor(lng
                    / Math.pow(8, 9 - i) % 8) * 8)));
        }

        return geopo.toString();

    }
}

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