鼠标（画矩形事件）

鼠标（画矩形事件）—不怎么样

 1 #include<iostream>
 2 #include<opencv2/opencv.hpp>
 3 
 4 #define WINDOW_NAME "鼠标事件窗口"
 5 
 6 using namespace std;
 7 using namespace cv;
 8 
 9 Rect g_rectangle;
10 bool g_bDrawingBox = false;
11 RNG g_rng(12345);
12 
13 void DrawRectangle(Mat &img, Rect box)
14 {
15     rectangle(img, box.tl(), box.br(), Scalar(g_rng.uniform(0, 255), g_rng.uniform(0, 255), g_rng.uniform(0, 255)));
16 }
17 
18 /*注意：不能在毁掉函数中写入未初始化的矩阵类，所以需要用时，需要写一个标志位，然后再在while(1)循环内使用*/
19 void onMouse(int event, int x, int y, int flag, void *param)
20 {
21     Mat &img = *(cv::Mat*)param;
22 
23     switch (event)
24     { 
25         //移动鼠标的时候
26     case CV_EVENT_MOUSEMOVE:
27     {
28                                if (g_bDrawingBox)
29                                {
30                                    g_rectangle.width = x - g_rectangle.x;
31                                    g_rectangle.height = y - g_rectangle.y;
32                                }
33     }
34         break;
35         //点击鼠标左键时
36     case CV_EVENT_LBUTTONDOWN:
37     {
38                                  g_bDrawingBox = true;
39                                  g_rectangle = Rect(x, y, 0, 0);
40     }
41         break;
42         //松开鼠标左键时
43     case CV_EVENT_LBUTTONUP:
44     {
45                                g_bDrawingBox = false;
46 
47                                DrawRectangle(img, g_rectangle);
48     }
49         break;
50     }
51 }
52 
53 int main()
54 {
55     Mat srcImage(600, 800, CV_8UC3);
56     Mat tempImage;
57 
58     srcImage.copyTo(tempImage);
59 
60     srcImage = Scalar::all(0);
61 
62     namedWindow(WINDOW_NAME);
63     setMouseCallback(WINDOW_NAME, onMouse, (void *)&srcImage);
64 
65     while (1)
66     {
67         srcImage.copyTo(tempImage);
68 
69         if (g_bDrawingBox)
70             DrawRectangle(tempImage, g_rectangle);
71 
72         imshow(WINDOW_NAME, tempImage);
73 
74         if(waitKey(10) == 27)
75             break;
76 
77         /*DrawRectangle(srcImage, g_rectangle);
78         imshow(WINDOW_NAME, srcImage);
79         if (waitKey(10) == 27)
80             break;*/
81     }
82 
83     return 0;
84 }