Qt-OpenCV学习笔记--基本数据结构--Rect

一、构造

    cv::Rect r1;//空构造

    cv::Rect r2(r1);//拷贝构造

    //定义起点、宽度、高度
    int x = 10;
    int y = 10;
    int w = 100;
    int h = 100;
    cv::Rect r3(x,y,w,h);

    //定义起点和尺寸
    cv::Point p(10,10);
    cv::Size s(100,100);
    cv::Rect r4(p,s);

    //定义起点和终点
    cv::Point p_start(100,100);
    cv::Point p_end(200,200);
    cv::Rect r5(p_start,p_end);

二、取值

    //定义一个矩形
    int x = 10;
    int y = 10;
    int w = 100;
    int h = 100;
    cv::Rect r3(x,y,w,h);

    //取值
    int p = r3.x;
    int q = r3.y;
    int m = r3.width;
    int n = r3.height;

三、函数

    //定义一个矩形
    int p = r3.x;
    int q = r3.y;
    int m = r3.width;
    int n = r3.height;

    //矩形的面积
    int area = r3.area();

    //矩形的尺寸
    cv::Size size = r3.size();

    //矩形的左上点
    cv::Point a = r3.tl();

    //矩形的右下点
    cv::Point b = r3.br();

    //是否包含点a
    bool i = r3.contains(a);

四、几何运算

    //定义3个矩形 
    cv::Rect rect1;
    cv::Rect rect2;
    cv::Rect rect3;

    //交运算
    rect3 = rect1 & rect2;

    //并运算
    cv::Rect rect4;
    rect4 = rect1 | rect2;

    //偏移
    cv::Size xy;
    cv::Rect rect5;
    cv::Rect rect6;
    rect6 = rect5 + xy;

    //判断是否相等
    cv::Rect rect7;
    cv::Rect rect8;
    int eq = (rect7==rect8);