opencv-cv::Point：二维/三维点类

cv::Point3i p;  //创建三维点对象
    cv::Point2i p1;  //创建二维点对象
    /*
    i  表示坐标点的数据类型     i是32-bit integer
    f是32-bit floating-point number
    b是unsigned character
    s是short integer
    d是64-bit floating-point number
*/

    cv::Point3i p2(10,20,40);
    cv::Point3f p3(p2);  //拷贝构造
    
    cv::Point3i p4(1,2,3);
    
    qDebug()<<p3.x<<"   "<<p3.y<<"   "<<p3.z;  //成员访问