package com.stylefeng.guns.modular.system.util;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 电子围栏工具类
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*/
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public class ElectricFenceUtil {
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/**
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* @return
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*/
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public static boolean monitorElectricFenc(String coordinate, String locations){
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return areaMonitoring(coordinate, locations);
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}
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public static boolean areaMonitoring(String coordinate, String lonLat){
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boolean flag = false;
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String[] split = coordinate.split(";");
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List<Double> pointsX = new ArrayList<>();
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List<Double> pointsY = new ArrayList<>();
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for (String s : split) {
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pointsX.add(Double.valueOf(s.split(",")[0]));
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pointsY.add(Double.valueOf(s.split(",")[1]));
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}
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String lon1 = lonLat.split(",")[0];
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String lat1 = lonLat.split(",")[1];
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boolean inPolygon = isInPolygon(Double.valueOf(lon1), Double.valueOf(lat1), pointsX, pointsY);
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if (inPolygon){
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flag = true;
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}
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return flag;
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}
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/**
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// * 判断点是否在多边形内
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// * @param px 测试点
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// * @param polygonXA 多边形的点
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// * @return boolean true:在多边形内, false:在多边形外
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// * @throws
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// * @Title: IsPointInPoly
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// */
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public static boolean isInPolygon(double px, double py,List<Double> polygonXA, List<Double> polygonYA) {
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boolean isInside = false;
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double ESP = 1e-9;
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int count = 0;
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double linePoint1x;
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double linePoint1y;
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double linePoint2x = 180;
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double linePoint2y;
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linePoint1x = px;
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linePoint1y = py;
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linePoint2y = py;
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for (int i = 0; i < polygonXA.size() - 1; i++) {
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double cx1 = polygonXA.get(i);
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double cy1 = polygonYA.get(i);
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double cx2 = polygonXA.get(i + 1);
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double cy2 = polygonYA.get(i + 1);
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if (isPointOnLine(px, py, cx1, cy1, cx2, cy2)) {
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return true;
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}
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if (Math.abs(cy2 - cy1) < ESP) {
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continue;
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}
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if (isPointOnLine(cx1, cy1, linePoint1x, linePoint1y, linePoint2x,
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linePoint2y)) {
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if (cy1 > cy2)
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count++;
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} else if (isPointOnLine(cx2, cy2, linePoint1x, linePoint1y,
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linePoint2x, linePoint2y)) {
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if (cy2 > cy1)
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count++;
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} else if (isIntersect(cx1, cy1, cx2, cy2, linePoint1x,
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linePoint1y, linePoint2x, linePoint2y)) {
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count++;
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}
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}
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if (count % 2 == 1) {
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isInside = true;
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}
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return isInside;
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}
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public static double Multiply(double px0, double py0, double px1, double py1,
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double px2, double py2) {
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return ((px1 - px0) * (py2 - py0) - (px2 - px0) * (py1 - py0));
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}
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public static boolean isPointOnLine(double px0, double py0, double px1,
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double py1, double px2, double py2) {
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boolean flag = false;
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double ESP = 1e-9;
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if ((Math.abs(Multiply(px0, py0, px1, py1, px2, py2)) < ESP)
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&& ((px0 - px1) * (px0 - px2) <= 0)
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&& ((py0 - py1) * (py0 - py2) <= 0)) {
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flag = true;
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}
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return flag;
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}
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public static boolean isIntersect(double px1, double py1, double px2, double py2,
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double px3, double py3, double px4, double py4) {
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boolean flag = false;
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double d = (px2 - px1) * (py4 - py3) - (py2 - py1) * (px4 - px3);
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if (d != 0) {
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double r = ((py1 - py3) * (px4 - px3) - (px1 - px3) * (py4 - py3))
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/ d;
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double s = ((py1 - py3) * (px2 - px1) - (px1 - px3) * (py2 - py1))
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/ d;
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if ((r >= 0) && (r <= 1) && (s >= 0) && (s <= 1)) {
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flag = true;
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}
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}
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return flag;
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}
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}
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