#include<iostream> 
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp> 


using namespace cv;  




int main( int argc, char** argv )
{  
  
 IplImage* img = cvLoadImage( "D:\\123\\2.jpg" ,1);    


 
 cvLine(img,cvPoint(100,100),cvPoint(200,200),cvScalar(0, 0, 255), 3, 4, 0);//這個函式是畫直線函式//


 cvNamedWindow( "zcy", CV_WINDOW_AUTOSIZE );    
 cvShowImage( "zcy", img );    
 cvWaitKey(0);   
 cvReleaseImage( &img ); 
 cvDestroyWindow("zcy");
}