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  • 用鼠标在窗口中画方形的程序

    #include <cv.h>
    #include <highgui.h>
    void my_mouse_callback(int event, int x, int y, int flags, void* param);
    
    CvRect box;
    bool drawing_box = false;
    
    void draw_box(IplImage *img, CvRect rect)
    {
        cvRectangle(img, cvPoint(box.x, box.y), cvPoint(box.x + box.width, box.y + box.height), cvScalar(0xff, 0x00, 0x00));
    }
    int main()
    {
        box = cvRect(-1, -1, 0, 0);
        IplImage *image = cvCreateImage(cvSize(200, 200), IPL_DEPTH_8U, 3);
        cvZero(image);
        IplImage *temp = cvCloneImage(image);
        cvNamedWindow("Box Example");
        cvSetMouseCallback("Box Example", my_mouse_callback, (void*)image);
        while (1)
        {
            cvCopyImage(image, temp);
            if (drawing_box) draw_box(temp, box);
            cvShowImage("Box Example", temp);
            char c = cvWaitKey(15);
            if (c == 27) break;
        }
        cvReleaseImage(&image);
        cvReleaseImage(&temp);
        cvDestroyWindow("Box Example");
        return 0;
    }
    void my_mouse_callback(int event, int x, int y, int flags, void* param)
    {
        IplImage *image = (IplImage*)param;
        switch (event)
        {
        case CV_EVENT_MOUSEMOVE:{ //鼠标进行移动
            if (drawing_box)
            {
                box.width = x - box.x;
                box.height = y - box.y;
            }
        }
        break;
        case CV_EVENT_LBUTTONDOWN:
        {
            drawing_box = true;
            box = cvRect(x, y, 0, 0); //确定当前矩形的左上角 width和height不确定
        }
        break;
        case CV_EVENT_MBUTTONUP:{ //确定一个矩形
            drawing_box = false;
            if (box.width < 0) //设定矩形以左上角为基础 
            {
                box.x += box.width;
                box.width *= -1;
            }
            if (box.height < 0)
            {
                box.y += box.height;
                box.height *= -1;
            }
            draw_box(image, box);
        }
        break;
        }
    }
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  • 原文地址:https://www.cnblogs.com/chenyang920/p/5352841.html
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