RotatedRect类（旋转矩形）

C++: RotatedRect::RotatedRect(const
Point2f& center, const Size2f& size,
float angle)

Parameters:	center – The rectangle mass center. size – Width and height of the rectangle. angle – The rotation angle in a clockwise direction. When the angle is 0, 90, 180, 270 etc., the rectangle becomes an up-right rectangle.

C++: void RotatedRect::points(Point2f pts[]) const

Parameters:	pts – The points array for storing rectangle vertices.

C++: Rect boundingRect(InputArray points)

Parameters:	points – Input 2D point set, stored in std::vector or Mat.

The function calculates and returns the minimal up-right bounding rectangle for the specified point set.

示例如下：

#include <opencv2/opencv.hpp>

#include <iostream>

using namespace std;

using namespace cv;

int main()

{

Mat image(200, 200, CV_8UC3, Scalar(0));

RotatedRect rRect = RotatedRect(Point2f(100,100), Size2f(100,50), 30);

Point2f vertices[4];

rRect.points(vertices);

for (int i = 0; i < 4; i++)

line(image, vertices[i], vertices[(i+1)%4], Scalar(255,255,255));//白色矩形

Rect brect = rRect.boundingRect();

rectangle(image, brect, Scalar(255,0,0));

imshow("rectangles", image);

waitKey();

return 0;

}