polygon.cpp

#include "polygon.h"

Polygon::Polygon(const std::vector<Eigen::Vector2d>& points)
{
	this->points = points;
}

Polygon::~Polygon()
{
}

bool Polygon::JudgePointInside(Eigen::Vector2d p)
{
	if (points.size() < 3) {
		return false;
	}
	if (find == 0) {
		minx = MAX_D;
		maxx = MIN_D;
		miny = MAX_D;
		maxy = MIN_D;
		for (int i = 0; i < points.size(); i++) {
			minx = std::min(points[i].x(), minx);
			maxx = std::max(points[i].x(), maxx);
			miny = std::min(points[i].y(), miny);
			maxy = std::max(points[i].y(), maxy);
		}
		find = 1;
	}
	if (p.x() < minx || p.x() > maxx || p.y() < miny || p.y() > maxy) return false;
	int i, j, c = 0;
	for (i = 0, j = points.size() - 1; i < points.size(); j = i++) {
		if (((points[i].y() > p.y()) != (points[j].y() > p.y())))
			if (p.x() < (points[j].x() - points[i].x()) * (p.y() - points[i].y()) / (points[j].y() - points[i].y()) + points[i].x())
				c = !c;
	}
	return c;
}

void Polygon::Draw(int index)
{
	//cv::Mat img(3000, 3000, CV_8UC3);
	//for (int i = 0; i < this->points.size() - 1; i++) {
	//	cv::line(img, cv::Point(this->points[i].x * 10 + 1500, this->points[i].y * 10 + 1500), cv::Point(this->points[i + 1].x * 10 + 1500, this->points[i + 1].y * 10 + 1500), cv::Scalar(0, 255, 255), 3);
	//}
	//cv::line(img, cv::Point(this->points[0].x * 10 + 1500, this->points[0].y * 10 + 1500), cv::Point(this->points[this->points.size() - 1].x * 10 + 1500, this->points[this->points.size() - 1].y * 10 + 1500), cv::Scalar(0, 255, 255), 3);
	//cv::imwrite("E:/OneDrive - mail.sdu.edu.cn/202012/DGraph/output/" + std::to_string(index) + ".jpg", img);
}