(OpenCV, RotatedRect) How to make RotatedRect class

This is example class creation.

RotatedRect tRect(Point2f(p2.x, p2.y), Size2f(W,H), atan(mn.first)*180/3.1415);

In Here,
p2.x, p2.y is center coordinate.
in Size2f(W,H), W, H is withd and Height of rectangle.
at last, atan(mn.first)*180/3.1415 means degree, atan(mn.first) is some radian
*180/3.1415 means calculation radian to degree.

Simplify,

RotatedRect tRect(Point2f(centerX, cneterY), Size2f(W,H), rotation_degree);

Thank you.