package com.mayiketang.demo.ditu;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Jisuan {
/**
* 地球半径
*/
private static double EARTH_RADIUS = 6378138.0;
private static double rad(double d) {
return d * Math.PI / 180.0;
}
/**
* 计算是否在圆上（单位/千米）
*
* @param radius 半径
* @param lat1 纬度
* @param lng1 经度
* @return double
* @throws
* @Title: GetDistance
* @Description: TODO()
*/
public static boolean isInCircle(double radius, double lat1, double lng1, double lat2, double lng2) {
double radLat1 = rad(lat1);
double radLat2 = rad(lat2);
double a = radLat1 - radLat2;
double b = rad(lng1) - rad(lng2);
double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
s = s * EARTH_RADIUS;
s = Math.round(s * 10000) / 10000;
if (s > radius) {//不在圆上
return false;
} else {
return true;
}
}
public static void main(String[] args) {
//eg:圆形
boolean inCircle = isInCircle(2497.2017066855014, 116.390615, 39.933416, 116.405994, 39.916263);
System.out.println(inCircle);
//eg:多边形
// 被检测的经纬度点
Map<String, String> orderLocation = new HashMap<String, String>();
orderLocation.put("X", "217.228117");
orderLocation.put("Y", "31.830429");
// 商业区域（百度多边形区域经纬度集合）
String partitionLocation = "31.839064_117.219116,31.83253_117.219403,31.828511_117.218146,31.826763_117.219259,31.826118_117.220517,31.822713_117.23586,31.822958_117.238375,31.838512_117.23798,31.839617_117.226194,31.839586_117.222925";
System.out.println(isInPolygon(orderLocation, partitionLocation));
}
/**
* 是否在矩形区域内
* @Title: isInArea
* @Description: TODO()
* @param lat 测试点经度
* @param lng 测试点纬度
* @param minLat 纬度范围限制1
* @param maxLat 纬度范围限制2
* @param minLng 经度限制范围1
* @param maxLng 经度范围限制2
* @return
* @return boolean
* @throws
*/
public static boolean isInRectangleArea(double lat,double lng,double minLat,
double maxLat,double minLng,double maxLng){
if(isInRange(lat, minLat, maxLat)){//如果在纬度的范围内
if(minLng*maxLng>0){
if(isInRange(lng, minLng, maxLng)){
return true;
}else {
return false;
}
}else {
if(Math.abs(minLng)+Math.abs(maxLng)<180){
if(isInRange(lng, minLng, maxLng)){
return true;
}else {
return false;
}
}else{
double left = Math.max(minLng, maxLng);
double right = Math.min(minLng, maxLng);
if(isInRange(lng, left, 180)||isInRange(lng, right,-180)){
return true;
}else {
return false;
}
}
}
}else{
return false;
}
}
/**
* 判断是否在经纬度范围内
* @Title: isInRange
* @Description: TODO()
* @param point
* @param left
* @param right
* @return
* @return boolean
* @throws
*/
public static boolean isInRange(double point, double left,double right){
if(point>=Math.min(left, right)&&point<=Math.max(left, right)){
return true;
}else {
return false;
}
}
/**
* 判断当前位置是否在多边形区域内
*
* @param orderLocation 当前点
* @param partitionLocation 区域顶点
* @return
*/
public static boolean isInPolygon(Map orderLocation, String partitionLocation) {
double p_x = Double.parseDouble((String) orderLocation.get("X"));
double p_y = Double.parseDouble((String) orderLocation.get("Y"));
Point2D.Double point = new Point2D.Double(p_x, p_y);
List<Point2D.Double> pointList = new ArrayList<Point2D.Double>();
String[] strList = partitionLocation.split(",");
for (String str : strList) {
String[] points = str.split("_");
double polygonPoint_x = Double.parseDouble(points[1]);
double polygonPoint_y = Double.parseDouble(points[0]);
Point2D.Double polygonPoint = new Point2D.Double(polygonPoint_x, polygonPoint_y);
pointList.add(polygonPoint);
}
return IsPtInPoly(point, pointList);
}
/**
* 判断点是否在多边形内，如果点位于多边形的顶点或边上，也算做点在多边形内，直接返回true
*
* @param point 检测点
* @param pts 多边形的顶点
* @return 点在多边形内返回true, 否则返回false
*/
public static boolean IsPtInPoly(Point2D.Double point, List<Point2D.Double> pts) {
int N = pts.size();
boolean boundOrVertex = true; //如果点位于多边形的顶点或边上，也算做点在多边形内，直接返回true
int intersectCount = 0;//cross points count of x
double precision = 2e-10; //浮点类型计算时候与0比较时候的容差
Point2D.Double p1, p2;//neighbour bound vertices
Point2D.Double p = point; //当前点
p1 = pts.get(0);//left vertex
for (int i = 1; i <= N; ++i) {//check all rays
if (p.equals(p1)) {
return boundOrVertex;//p is an vertex
}
p2 = pts.get(i % N);//right vertex
if (p.x < Math.min(p1.x, p2.x) || p.x > Math.max(p1.x, p2.x)) {//ray is outside of our interests
p1 = p2;
continue;//next ray left point
}
if (p.x > Math.min(p1.x, p2.x) && p.x < Math.max(p1.x, p2.x)) {//ray is crossing over by the algorithm (common part of)
if (p.y <= Math.max(p1.y, p2.y)) {//x is before of ray
if (p1.x == p2.x && p.y >= Math.min(p1.y, p2.y)) {//overlies on a horizontal ray
return boundOrVertex;
}
if (p1.y == p2.y) {//ray is vertical
if (p1.y == p.y) {//overlies on a vertical ray
return boundOrVertex;
} else {//before ray
++intersectCount;
}
} else {//cross point on the left side
double xinters = (p.x - p1.x) * (p2.y - p1.y) / (p2.x - p1.x) + p1.y;//cross point of y
if (Math.abs(p.y - xinters) < precision) {//overlies on a ray
return boundOrVertex;
}
if (p.y < xinters) {//before ray
++intersectCount;
}
}
}
} else {//special case when ray is crossing through the vertex
if (p.x == p2.x && p.y <= p2.y) {//p crossing over p2
Point2D.Double p3 = pts.get((i + 1) % N); //next vertex
if (p.x >= Math.min(p1.x, p3.x) && p.x <= Math.max(p1.x, p3.x)) {//p.x lies between p1.x & p3.x
++intersectCount;
} else {
intersectCount += 2;
}
}
}
p1 = p2;//next ray left point
}
if (intersectCount % 2 == 0) {//偶数在多边形外
return false;
} else { //奇数在多边形内
return true;
}
}
}