Mouse (Draw rectangle event)-Not much

1#include <iostream>2#include <opencv2/opencv.hpp>3 4 #defineWindow_name "Mouse Event window"5 6 using namespacestd;7 using namespaceCV;8 9 Rect G_rectangle;Ten BOOLG_bdrawingbox =false; OneRNG G_rng (12345); A  - voidDrawRectangle (Mat &img, Rect box) - { theRectangle (img, box.tl (), box.br (), Scalar (G_rng.uniform (0,255), G_rng.uniform (0,255), G_rng.uniform (0,255))); - } -  - /*Note: You cannot write an uninitialized matrix class in the Destroy function, so you need to write a flag bit and then use it within the while (1) loop .*/ + voidOnmouse (int Event,intXintYintFlagvoid*param) - { +Mat &img = * (cv::mat*) param; A  at     Switch(Event) -     {  -         //when moving the mouse -      CaseCv_event_mousemove: -     { -                                if(G_bdrawingbox) in                                { -G_rectangle.width = x-g_rectangle.x; toG_rectangle.height = y-g_rectangle.y; +                                } -     } the          Break; *         //When you click the left mouse button $      CaseCv_event_lbuttondown:Panax Notoginseng     { -G_bdrawingbox =true; theG_rectangle = Rect (x, Y,0,0); +     } A          Break; the         //when you release the left mouse button +      CaseCv_event_lbuttonup: -     { $G_bdrawingbox =false; $  - DrawRectangle (IMG, g_rectangle); -     } the          Break; -     }Wuyi } the  - intMain () Wu { -Mat Srcimage ( -, -, CV_8UC3); About Mat tempimage; $  - Srcimage.copyto (tempimage); -  -Srcimage = Scalar::all (0); A  + Namedwindow (window_name); theSetmousecallback (Window_name, Onmouse, (void*) &srcimage); -  $      while(1) the     { the Srcimage.copyto (tempimage); the  the         if(G_bdrawingbox) - DrawRectangle (Tempimage, g_rectangle); in  the imshow (Window_name, tempimage); the  About         if(Waitkey (Ten) == -) the              Break; the  the         /*DrawRectangle (Srcimage, g_rectangle); + imshow (Window_name, srcimage); - if (waitkey () = =) the Break ;*/Bayi     } the  the     return 0; -}

Mouse (Draw rectangle event)-not very good