Run cd /home/ci/opencv
modules/imgproc/include/opencv2/imgproc.hpp:4163: trailing whitespace.
+specified point set. The angle of rotation represents the angle between the line connecting the starting 
modules/imgproc/include/opencv2/imgproc.hpp:4165: trailing whitespace.
+and the horizontal axis. This angle always falls between \f$[-90, 0)\f$ because, if the object 
modules/imgproc/include/opencv2/imgproc.hpp:4166: trailing whitespace.
+rotates more than a rect angle, the next edge is used to measure the angle. The starting and ending points change 
modules/imgproc/include/opencv2/imgproc.hpp:4176: trailing whitespace.
+The function finds the four vertices of a rotated rectangle. The four vertices are returned 
modules/imgproc/include/opencv2/imgproc.hpp:4177: trailing whitespace.
+in clockwise order starting from the point with greatest \f$y\f$. If two points have the 
Error: Process completed with exit code 2.

std::vector<cv::Point2f> v{{0.0, 0.0}, {0.0, 1.0}, {1.0, 2.0}, {1.0, 1.0}};
std::cout << cv::minAreaRect(v).angle << '\n';