cv::mat 绘制矩形框

https://blog.youkuaiyun.com/Sunshine_in_Moon/article/details/45133097

    #include <iostream>  
    #include <opencv2\highgui\highgui.hpp>  
      
    using namespace std;  
    using namespace cv;  
    int main()  
    {  
        char *imageSrc = "I:\\OpenCV Learning\\picture\\sumpalace.jpg";  
        Mat matImage = imread(imageSrc,-1);  
            IplImage *iplImage = cvLoadImage(imageSrc,-1);  
          
        if(matImage.data==0||iplImage->imageData ==0)  
        {  
            cout<<"图片加载失败"<<endl;  
            return -1;  
        }     
          
        cv::rectangle(matImage,cvPoint(20,200),cvPoint(200,300),Scalar(255,0,0),1,1,0);  
        //Rect(int a,int b,int c,int d)a,b为矩形的左上角坐标,c,d为矩形的长和宽  
        cv::rectangle(matImage,Rect(100,300,20,200),Scalar(0,0,255),1,1,0);  
        cvRectangle(iplImage,cvPoint(20,200),cvPoint(200,300),Scalar(0,255,255),1,1,0);  
          
        imshow("matImage",matImage);  
        cvShowImage("IplImage",iplImage);  
        waitKey();  
        return 0;  
    }