package com.yihu.jw.utils;

public class CountDistance {
    private static double EARTH_RADIUS = 6378.137;// 6378.137赤道半径6378137

    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }

    /**
     * 通过经纬度计算两点之间的距离(单位：米)
     * @param latone
     * @param lngone
     * @param lattwo
     * @param lngtwo
     * @return
     */
    public  double getDistance(double latone, double lngone, double lattwo, double lngtwo) {
        double radlatone = rad(latone);
        double radlattwo = rad(lattwo);
        double a = radlatone - radlattwo;
        double b = rad(lngone) - rad(lngtwo);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
                + Math.cos(radlatone) * Math.cos(radlattwo)
                * Math.pow(Math.sin(b / 2), 2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000d) / 10000d;
        s = s*1000;
        return s;
    }

}