实际坐标、火星坐标、百度坐标互转

package com.jyt.infant.core.common;

import java.util.HashMap;
import java.util.Map;

/**
 * 
 * @ClassName: MarsCoordinateUtil
 * @Description: TODO(火星坐标转换)
 */
public class MarsCoordinateUtil {

	private double pi = 3.14159265358979324;
	private double a = 6378245.0;
	private double ee = 0.00669342162296594323;
	private double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

	/**
	 * 
	 * @Title: outOfChina
	 * @Description: TODO(天朝范围内)
	 * @param lat
	 * @param lon
	 * @return
	 */
	public boolean outOfChina(double lat, double lon) {
		if (lon < 72.004 || lon > 137.8347)
			return true;
		if (lat < 0.8293 || lat > 55.8271)
			return true;
		return false;
	}

	/**
	 * 
	 * @Title: transformLat
	 * @Description: TODO(偏移调整)
	 * @param x
	 * @param y
	 * @return
	 */
	public double transformLat(double x, double y) {
		double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));

		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
		ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;

		return ret;
	}

	/**
	 * 
	 * @Title: transformLon
	 * @Description: TODO(偏移调整)
	 * @param x
	 * @param y
	 * @return
	 */
	public double transformLon(double x, double y) {
		double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));

		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
		ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;

		return ret;
	}

	/**
	 * 
	 * @Title: transform2Mars
	 * @Description: TODO(地球坐标转换为火星坐标 )
	 * @param lat
	 * @param lon
	 * @return
	 */
	public Map<String, Double> transform2Mars(double lat, double lon) {
		Map<String, Double> map = new HashMap<String, Double>();

		if (!outOfChina(lat, lon)) {
			double dLat = transformLat(-105.0, lat - 35.0);
			double dLon = transformLon(lon - 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);
			dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);

			lat = lat + dLat;
			lon = lon + dLon;
		}

		map.put("latitude", lat);
		map.put("longitude", lon);

		return map;
	}

	/**
	 * 
	 * @Title: bdEncrypt
	 * @Description: TODO(火星坐标转换为百度坐标)
	 * @param lat
	 * @param lon
	 * @return
	 */

	public Map<String, Double> bdEncrypt(double lat, double lon) {
		Map<String, Double> map = new HashMap<String, Double>();

		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);

		lon = z * Math.cos(theta) + 0.0065;
		lat = z * Math.sin(theta) + 0.006;

		map.put("latitude", lat);
		map.put("longitude", lon);

		return map;
	}

	/**
	 * 
	 * @Title: bdDecrypt
	 * @Description: TODO(百度转火星)
	 * @param lat
	 * @param lon
	 * @return
	 */
	public Map<String, Double> bdDecrypt(double lat, double lon) {
		Map<String, Double> map = new HashMap<String, Double>();

		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);

		lon = z * Math.cos(theta);
		lat = z * Math.sin(theta);

		map.put("latitude", lat);
		map.put("longitude", lon);

		return map;
	}

}