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package com.seejoke.geo;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 坐标几何运算
 * @author zhiping.li
 * @date 2016/08/16
 */
public class GeoUtils {

	/**返回代为为米
	 * 算出两坐标位置的距离
	 * @param slat
	 * @param slon
	 * @param ulat
	 * @param ulon
	 * @return
	 */
	public static Double getDistence(Double slat, Double slon, Double ulat, Double ulon) {
		return 6378.137 * 2000 * Math.asin(Math.sqrt(
				Math.pow(Math.sin((slat * Math.PI / 180 - ulat * Math.PI / 180)/2), 2)
						+ Math.cos(slat * Math.PI / 180)
						* Math.cos(ulat * Math.PI / 180)
						* Math.pow(Math.sin((slon * Math.PI / 180 - ulon * Math.PI / 180)/2), 2)
		));
	}

	/** 检查一个坐标是否在多边形内     
	 * @param x 纬度 31.000... 
	 * @param y 经度 121.000...   
	 * @param polygonPoints 多边形边界的经纬度数组   
	 * @return     */  
	public static boolean isPointInPolygon(double x, double y, List> polygonPoints) {
		Point2D.Double geoPoint = buildPoint(x, y); 
		List geoPolygon = buildPolygon(polygonPoints); 
		return GeoUtils.isPointInPolygon(geoPoint, geoPolygon);
	}  
	/** 检查一个坐标是否在多边形内     * 
	 * @param point 检查的点坐标   
	 * @param polygon 参照的多边形   
	 * @return    
	 */   
	public static boolean isPointInPolygon(Point2D.Double point, List polygon) { 
		GeneralPath p = new GeneralPath();    
		Point2D.Double first = polygon.get(0);  
		p.moveTo(first.x, first.y);    
		polygon.remove(0);    
		polygon.forEach(d -> p.lineTo(d.x, d.y));
		p.lineTo(first.x, first.y);     
		p.closePath();      
		return p.contains(point);   
	}   
	/**  
	 * 构建一个坐标点   
	 * @param x 纬度 31.000... 
	 * @param y 经度 121.000...    
	 * @return   
	 */   
	public static Point2D.Double buildPoint(double x, double y) {    
		return new Point2D.Double(x, y); 
	}   

	/**构建一个多边形   
	 * @param polygonPoints  
	 * @return     */   
	public static List buildPolygon(List> polygonPoints) {      
		List geoPolygon = new ArrayList<>(); 
		polygonPoints.forEach(map -> geoPolygon.add(buildPoint(map.get("lon"), map.get("lat"))));
		return geoPolygon;  
	}
	public static void main(String[] args) {
		List> polygonPoints = new ArrayList<>();
		Map map = new HashMap<>();
		map.put("lon", 116.39665425);
		map.put("lat", 39.90045671);
		Map map1 = new HashMap<>();
		map1.put("lon", 116.39915943);
		map1.put("lat", 39.90053902);
		Map map2 = new HashMap<>();
		map2.put("lon", 116.39917016);
		map2.put("lat", 39.89993817);
		Map map3 = new HashMap<>();
		map3.put("lon", 116.39663815);
		map3.put("lat", 39.89988879);
		polygonPoints.add(map);
		polygonPoints.add(map1);
		polygonPoints.add(map2);
		polygonPoints.add(map3);
		System.out.println(isPointInPolygon(120.388431,32.261701,polygonPoints));
		//Point point5 = new Point(116.39791489,39.90019744);
	}
}