From d2660432ee1958228b4841c4e9f78901787ee258 Mon Sep 17 00:00:00 2001
From: wenc000 <450292408@qq.com>
Date: Tue, 29 Oct 2019 23:44:07 +0800
Subject: [PATCH] =?UTF-8?q?PointUtil=E6=96=B0=E5=A2=9E=E7=BB=8F=E7=BA=AC?=
 =?UTF-8?q?=E5=BA=A6=E8=AE=A1=E7=AE=97=E8=B7=9D=E7=A6=BB=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../com/cm/common/utils/point/PointUtil.java  | 32 ++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/cloud-common/src/main/java/com/cm/common/utils/point/PointUtil.java b/cloud-common/src/main/java/com/cm/common/utils/point/PointUtil.java
index 60cfc6a..6ee6418 100644
--- a/cloud-common/src/main/java/com/cm/common/utils/point/PointUtil.java
+++ b/cloud-common/src/main/java/com/cm/common/utils/point/PointUtil.java
@@ -1,6 +1,7 @@
 package com.cm.common.utils.point;
 
 import java.awt.*;
+import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -16,6 +17,10 @@ import java.util.List;
  **/
 public class PointUtil {
 
+    private static final double EARTH_RADIUS = 637_1393.00D;
+    private static final double RADIAN = Math.PI / 180.00D;
+    private static final double HALF = 0.5D;
+
     /**
      * 点在多边形内
      *
@@ -133,6 +138,31 @@ public class PointUtil {
         return s;
     }
 
+    /**
+     * 计算距离，Point的x为纬度，y为经度
+     *
+     * @param point1
+     * @param point2
+     * @return
+     */
+    public static double getDistance(Point point1, Point point2) {
+        double lat1 = point1.getX();
+        double lon1 = point1.getY();
+        double lat2 = point2.getX();
+        double lon2 = point2.getY();
+        double x, y, a, b, distance;
+
+        lat1 *= RADIAN;
+        lat2 *= RADIAN;
+        x = lat1 - lat2;
+        y = lon1 - lon2;
+        y *= RADIAN;
+        a = Math.sin(x * HALF);
+        b = Math.sin(y * HALF);
+        distance = EARTH_RADIUS * Math.asin(Math.sqrt(a * a + Math.cos(lat1) * Math.cos(lat2) * b * b)) / HALF;
+        return new BigDecimal(distance).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
+    }
+
     public static void main(String[] args) {
         Point point = new Point(111.770495, 40.871839);
         List<Point> points = new ArrayList<>();
@@ -141,7 +171,7 @@ public class PointUtil {
         points.add(new Point(111.77202968235643, 40.86936472871906));
         points.add(new Point(111.77072713936697, 40.87228340534707));
 
-        System.out.println(PointUtil.isPointInPoly(point, points));
+        System.out.println(PointUtil.getDistance(new Point(111.76776160830235, 40.87164162798379), new Point(111.76940775314925, 40.868854144474206)));
 
     }