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  • opencv鼠标绘制直线 C++版

    因为需要在图片上标记直线,所以从网上找了相应的参考资料。但大多都是c风格的,于是自己就写了一个c++风格的。

    opencv2.4.11,win8.1,vs2013

    #include <cv.h>  
    #include <highgui.h>   
    #include <string>
     
    cv::Mat src;
    cv::Mat dst;
    
    void on_mouse(int event, int x, int y, int flags, void* ustc)
    {
    	static CvPoint pre_pt = { -1, -1 };
    	static CvPoint cur_pt = { -1, -1 };
    
    	if (event == CV_EVENT_LBUTTONDOWN)
    	{
    		dst.copyTo(src);
    		pre_pt = cvPoint(x, y);
    		cv::circle(src, pre_pt, 3, cvScalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);
    		imshow("src", src);
    		src.copyTo(dst);
    	}
    	else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))
    	{
    		dst.copyTo(src);
    		cur_pt = cvPoint(x, y);
    		cv::line(src, pre_pt, cur_pt, cvScalar(0, 255, 0, 0), 1, CV_AA, 0);
    		imshow("src", src);
    	}
    	else if (event == CV_EVENT_LBUTTONUP)
    	{
    		dst.copyTo(src);
    		cur_pt = cvPoint(x, y);
    		cv::circle(src, cur_pt, 3, cvScalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);
    		cv::line(src, pre_pt, cur_pt, cvScalar(0, 255, 0, 0), 1, CV_AA, 0);
    		imshow("src", src);
    		src.copyTo(dst);
    	}
    }
    
    int main()
    {
    	cv::namedWindow("src", CV_WINDOW_AUTOSIZE);
    	src = cv::imread("lena.jpg", 1);
    	src.copyTo(dst);
    
    	cv::setMouseCallback("src", on_mouse, 0);
    	
    	cv::imshow("src", src);
    	cv::waitKey(0);
    	
    	return 0;
    }
    

    效果图

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  • 原文地址:https://www.cnblogs.com/iois/p/4651419.html
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