#include <highgui.h>

 #include <cv.h>

 #include "opencv_libs.h"

 #pragma comment (lib,"opencv_calib3d231d.lib")

 #pragma comment (lib,"opencv_contrib231d.lib")

 #pragma comment (lib,"opencv_core231d.lib")

 #pragma comment (lib,"opencv_features2d231d.lib")

 #pragma comment (lib,"opencv_flann231d.lib")

 #pragma comment (lib,"opencv_gpu231d.lib")

 #pragma comment (lib,"opencv_haartraining_engined.lib")

 #pragma comment (lib,"opencv_highgui231d.lib")

 #pragma comment (lib,"opencv_imgproc231d.lib")

 #pragma comment (lib,"opencv_legacy231d.lib")

 #pragma comment (lib,"opencv_ml231d.lib")

 #pragma comment (lib,"opencv_objdetect231d.lib")

 #pragma comment (lib,"opencv_ts231d.lib")

 #pragma comment (lib,"opencv_video231d.lib")

 /*

  *《学习OpenCV》第四章第三题a

  * 完成时间：22:17 3/30 星期六 2013

  */

 /* 矩形框 */

 CvRect rect;

 bool draw = false;   // 标记是否在画

 IplImage* img;

 IplImage * temp;

 IplImage * original;

 void draw_rect(IplImage* img, CvRect rect)

 {

     cvRectangle( img,

         cvPoint( rect.x, rect.y ),

         cvPoint( rect.x + rect.width, rect.y + rect.height),

         cvScalar( 0x00, 0x00, 0xff) );

     printf("draw\n");

 }

 // 鼠标回调函数

 void my_mouse_callback( int event, int x, int y, int flags, void* param)

 {

     IplImage* image = (IplImage*) param;

     switch( event )

     {

     case CV_EVENT_MOUSEMOVE:

         {

             if(draw)

             {

                 rect.width = x - rect.x;

                 rect.height = y - rect.y;

             }

         }

         break;

     case CV_EVENT_LBUTTONDOWN:

         {

             draw = true;

             rect = cvRect( x, y, ,  );

         }

         break;

     case CV_EVENT_LBUTTONUP:

         {

             draw = false;

             if(rect.width < )

             {

                 rect.x += rect.width;

                 rect.width *= -;

             }

             if(rect.height < )

             {

                 rect.y += rect.height;

                 rect.height *= -;

             }

             // draw

             draw_rect(image, rect);

         }

         break;

         // 在右键按下时清除

     case CV_EVENT_RBUTTONDOWN:

         cvCopyImage(original, img);

         printf("clear.\n");

         break;

     }

 }

 int main()

 {

     img = cvLoadImage( "lena.bmp",  );

     rect = cvRect( -, -, , );

     // 副本

     temp = cvCloneImage( img );

     original = cvCloneImage(img);

     cvNamedWindow("draw rect");

     cvSetMouseCallback("draw rect", my_mouse_callback, (void*)img);

     while()

     {

         cvCopyImage(img, temp);

         if(draw)

         {

             draw_rect( temp , rect );

         }

         cvShowImage( "draw rect", temp);

         if(cvWaitKey() == )

             break;

     }

     cvReleaseImage(&img);

     cvReleaseImage(&temp);

     cvReleaseImage(&original);

     cvDestroyAllWindows();

     return ;

 }