OpenCV中利用鼠标绘制直线

在这里不多说了，直接贴代码。希望对大家学习OpenCV有用，欢迎大家的建议！

[c-sharp] view plain copy print ?

1. #include <cv.h>  
2. #include <highgui.h>  
3. #include <stdio.h>  
4. #pragma comment( lib, "cv.lib" )  
5. #pragma comment( lib, "cxcore.lib" ) 
6. #pragma comment( lib, "highgui.lib" )   
7. IplImage* src = 0;   
8. IplImage* dst = 0;   
9. void on_mouse( int event, int x, int y, int flags, void* ustc)  
10. {  
11.     static CvPoint pre_pt = {-1,-1};  
12.     static CvPoint cur_pt = {-1,-1};  
13.     CvFont font;  
14.     cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);  
15.     char temp[16];  
16.       
17.     if( event == CV_EVENT_LBUTTONDOWN )  
18.     {  
19.         cvCopy(dst,src);  
20.         sprintf(temp,"(%d,%d)",x,y);  
21.         pre_pt = cvPoint(x,y);  
22.         cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255));  
23.         cvCircle( src, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );  
24.         cvShowImage( "src", src );  
25.         cvCopy(src,dst);  
26.     }  
27.     else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))  
28.     {  
29.         cvCopy(dst,src);  
30.         sprintf(temp,"(%d,%d)",x,y);  
31.         cur_pt = cvPoint(x,y);        
32.         cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));  
33.         cvLine(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 );  
34.         cvShowImage( "src", src );  
35.     }  
36.     else if( event == CV_EVENT_LBUTTONUP )  
37.     {  
38.         sprintf(temp,"(%d,%d)",x,y);  
39.         cur_pt = cvPoint(x,y);        
40.         cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));  
41.         cvCircle( src, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );  
42.         cvLine( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 );  
43.         cvShowImage( "src", src );  
44.         cvCopy(src,dst);  
45.     }  
46. }  
47. int main()  
48. {  
49.     src=cvLoadImage("lena.jpg",1);  
50.     dst=cvCloneImage(src);  
51.     cvNamedWindow("src",1);  
52.     cvSetMouseCallback( "src", on_mouse, 0 );  
53.       
54.     cvShowImage("src",src);  
55.     cvWaitKey(0);   
56.     cvDestroyAllWindows();  
57.     cvReleaseImage(&src);  
58.     cvReleaseImage(&dst);  
59.     return 0;  
60. }  

#include <cv.h> #include <highgui.h> #include <stdio.h> #pragma comment( lib, "cv.lib" ) #pragma comment( lib, "cxcore.lib" ) #pragma comment( lib, "highgui.lib" ) IplImage* src = 0; IplImage* dst = 0; 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}; CvFont font; cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA); char temp[16]; if( event == CV_EVENT_LBUTTONDOWN ) { cvCopy(dst,src); sprintf(temp,"(%d,%d)",x,y); pre_pt = cvPoint(x,y); cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255)); cvCircle( src, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); cvShowImage( "src", src ); cvCopy(src,dst); } else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON)) { cvCopy(dst,src); sprintf(temp,"(%d,%d)",x,y); cur_pt = cvPoint(x,y); cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); cvLine(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 ); cvShowImage( "src", src ); } else if( event == CV_EVENT_LBUTTONUP ) { sprintf(temp,"(%d,%d)",x,y); cur_pt = cvPoint(x,y); cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); cvCircle( src, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); cvLine( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 ); cvShowImage( "src", src ); cvCopy(src,dst); } } int main() { src=cvLoadImage("lena.jpg",1); dst=cvCloneImage(src); cvNamedWindow("src",1); cvSetMouseCallback( "src", on_mouse, 0 ); cvShowImage("src",src); cvWaitKey(0); cvDestroyAllWindows(); cvReleaseImage(&src); cvReleaseImage(&dst); return 0; }

效果图如下，说明一下这里的坐标原点是图像的左上角。