Opencv中RotatedRect和ellipse的角度方向

版本：opencv-4.7.0-windows
Opencv中，大多数时候，逆时针旋转是正方向，但在RotatedRect和ellipse中，顺时针旋转是正方向。

//RotatedRect的角度参数是顺时针为正方向
RotatedRect(const Point2f& center, const Size2f& size, float angle);//ellipse的angle、startAngle、endAngle都是顺时针为正方向
void ellipse(InputOutputArray img, Point center, Size axes,double angle, double startAngle, double endAngle,const Scalar& color, int thickness = 1,int lineType = LINE_8, int shift = 0);

源码说明：
在这里插入图片描述
代码测试：

#include <opencv2/opencv.hpp>
int main()
{
#pragma region RotatedRect顺时针为正cv::Mat image = cv::Mat(500, 500, CV_8UC3, cv::Scalar(255,255,255));cv::Scalar color(0, 0, 255); cv::Point2f center1 = cv::Point2f(100, 100);cv::Size2f axes1 = cv::Size2f(100, 50);cv::RotatedRect rotatedRect(center1, axes1, 0);cv::Point2f vertices[4];rotatedRect.points(vertices);for (int i = 0; i < 4; i++) {cv::line(image, vertices[i], vertices[(i + 1) % 4], color, 1, cv::LINE_AA);}cv::Point2f center2 = cv::Point2f(300, 100);cv::RotatedRect rotatedRect1(center2, axes1, 5);rotatedRect1.points(vertices);for (int i = 0; i < 4; i++) {cv::line(image, vertices[i], vertices[(i + 1) % 4], color, 1, cv::LINE_AA);}
#pragma endregion#pragma region ellipse顺时针为正cv::Point center3 = cv::Point(50,300);int radius1 = 50;int startAngle = 0;int endAngle = 90;cv::ellipse(image, center3, cv::Size(radius1, radius1), 0, startAngle, endAngle, color, 5, cv::LINE_AA);cv::Point center4 = cv::Point(250, 300);endAngle = 180;cv::ellipse(image, center4, cv::Size(radius1, radius1), 0, startAngle, endAngle, color, 5, cv::LINE_AA);cv::Point center5 = cv::Point(400, 300);cv::ellipse(image, center5, cv::Size(radius1, radius1), 30, startAngle, endAngle, color, 5, cv::LINE_AA);cv::imshow("Image", image);cv::waitKey(0);cv::destroyAllWindows();
#pragma region ellipse顺时针为正
}