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来源：互联网发布：恭亲王奕欣知乎编辑：程序博客网时间：2024/06/06 09:32

鼠标操作

opencv中使用鼠标进行交互。
鼠标操作与滑动条的消息映射方式很类似，都是通过一个中介函数配合一个回调函数来实现的。

#include <opencv2/opencv.hpp>using namespace cv;#define WINDOW_NAME "程序窗口"void on_MouseHandle(int event, int x, int y, int flags, void *param);void DrawRectangle(cv::Mat& img, cv::Rect box);void ShowHelpText();Rect g_rectangle;bool g_bDrawingBox = false;RNG g_rng(12345);int main(){    g_rectangle = Rect(-1, -1, 0, 0);    Mat srcImage(600, 800, CV_8UC3), tempImage;    srcImage.copyTo(tempImage);    g_rectangle = Rect(-1, -1, 0, 0);    srcImage = Scalar::all(0);    namedWindow(WINDOW_NAME);    setMouseCallback(WINDOW_NAME, on_MouseHandle, (void*)&srcImage);    while (1)    {        srcImage.copyTo(tempImage);        if (g_bDrawingBox)            DrawRectangle(tempImage, g_rectangle);        imshow(WINDOW_NAME, tempImage);        if (waitKey(10) == 27) break;    }    return 0;}void on_MouseHandle(int event, int x, int y, int flags, void * param)//鼠标回调函数{    Mat & image = *(cv::Mat*) param;    switch (event)    {    case EVENT_MOUSEMOVE:        {               //鼠标移动消息                if (g_bDrawingBox)//是否进行绘制                    {                            g_rectangle.width = x - g_rectangle.x;                            g_rectangle.height = y - g_rectangle.y;                    }        }        break;        //左键按下消息    case EVENT_LBUTTONDOWN:    {          g_bDrawingBox = true;          g_rectangle = Rect(x, y, 0, 0);    }        break;    //左键抬起消息    case EVENT_LBUTTONUP:    {        g_bDrawingBox = false;        if (g_rectangle.width < 0)            {                g_rectangle.x += g_rectangle.width;                g_rectangle.width *= -1;            }        if (g_rectangle.height < 0)            {                g_rectangle.y += g_rectangle.height;                g_rectangle.height *= -1;            }        DrawRectangle(image, g_rectangle);        break;    }    }}void DrawRectangle(cv::Mat& img, cv::Rect box)//自定义矩形绘制函数{    rectangle(img, box.tl(), box.br(), Scalar(g_rng.uniform(0, 255), g_rng.uniform(0, 255), g_rng.uniform(0, 255)));//随机颜色}

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