RotatedRect and Ellipse (Bug #425)

Hy just to say that this morning I try to use rotated rect and ellispe and I had two bad surprises:

First of all I have a painted a shape on an image, then I have find its shape, and finally I have tried to fit an Ellipse on the shape

This is the first part that seems to work okay

cv::vector< cv::vector< cv::Point > > vecPts;
findContours(img, vecPts, CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);
cv::RotatedRect rrect = cv::fitEllipse(cv::Mat(vecPts));

But now I have two problems:

1- I can't paint correctly the RotatedRect:

To paint I need to invert the angle:

rrect.angle*=-1;
cv::ellipse(img,rrect,cv::Scalar(0,0,255,0),2);

or if I use the other function I need to inverse the angle and divide the size by 2

cv::Size rSize= cv::Size(rrect.size.width/2,rrect.size.height/2);
cv::ellipse(img,rrect.center,rSize,-rrect.angle,0,360,cv::Scalar(0,255,255,255),2);

2- Another problems is using RotatedRect::points() method which doesn't work, and set me point somewhere else.

cv::Point2f rrPtsr4;
rrect.points(rrPts);

It seems to be the
float a = (float)cos(_angle)*0.5f;
float b = (float)sin(_angle)*0.5f;

that need to be changed in
float a = (float)sin(_angle)*0.5f;
float b = (float)cos(_angle)*0.5f;

in core/operations.hpp

I don't know which functions was a bad behaviour (the angle is bad in fitEllipse or is it bad at painting?
Why do I need to rescale the size of a rotated rect by 2?

Therefore I did not write any patch for this!!!

I hope it will help you guy.