Detailed explanation of rect class

If you create a Rect object rect(100, 50, 50, 100), that rect There will be the following functions ：

rect.area(); // return rect The area of 5000
rect.size(); // return rect The size of the [50 × 100]
rect.tl(); // return rect The coordinates of the upper left vertex of [100, 50]
rect.br(); // return rect The coordinates of the lower right vertex of [150, 150]
rect.width(); // return rect Width 50
rect.height(); // return rect Height 100
rect.x
rect.contains(Point(x, y)); // Returns a boolean variable , Judge rect Does it include Point(x, y) spot

// You can also find the intersection and union of two rectangles
rect = rect1 & rect2;
rect = rect1 | rect2;

// You can also pan and zoom the rectangle
rect = rect + Point(-100, 100); // translation , That is, the top left vertex x coordinate -100,y coordinate +100
rect = rect + Size(-100, 100); // The zoom , Top left vertex unchanged , Width -100, Height +100

// You can also compare rectangles , Returns a boolean variable
rect1 == rect2;
rect1 != rect2;

//OpenCV There seems to be no judgment in rect1 Whether in rect2 The function inside , So write one yourself
bool isInside(Rect rect1, Rect rect2)
{
return (rect1 == (rect1&rect2));
}

//OpenCV It seems that there is no function to obtain the center point of the rectangle , Or write one by yourself
Point getCenterPoint(Rect rect)
{
Point cpt;
cpt.x = rect.x + cvRound(rect.width/2.0);
cpt.y = rect.y + cvRound(rect.height/2.0);
return cpt;
}

// Scale around the center of the rectangle
Rect rectCenterScale(Rect rect, Size size)
{
rect = rect + size;
Point pt;
pt.x = cvRound(size.width/2.0);
pt.y = cvRound(size.height/2.0);
return (rect-pt);
}