OpenCV

开发平台：

Visual C++

OpenCV画矩形.txt：源码内容

							#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#pragma comment(lib,"cv.lib")
#pragma comment(lib,"cxcore.lib")
#pragma comment(lib,"highgui.lib")
 
CvRect box;
bool Drawing=false;
void my_mouse_callback(int event, int x, int y, int flags, void* param);//实现对窗口Window_Name上的对象param添加鼠标响应操作
void DrawRect(IplImage*img,CvRect rect)
{
    cvRectangle(img,cvPoint(box.x,box.y),cvPoint(box.x+box.width,box.y+box.height),cvScalar(0x00,0xff,0x00),2);
}
 int main(int argc,char*argv[])
 {
	    box=cvRect(0,0,-1,-1);
	    
	    IplImage*img=cvCreateImage(cvSize(640,480),IPL_DEPTH_8U,3);
	    
	    cvZero(img);
	    IplImage*temp=cvCloneImage(img);
		cvNamedWindow("Draw_Rectangle",CV_WINDOW_AUTOSIZE);
		cvSetMouseCallback("Draw_Rectangle",my_mouse_callback,(void*)img);//设置鼠标事件回调函数
	     while(1)
	     {
	         cvCopyImage(img,temp);
		         if(Drawing)
			           DrawRect(temp,box);
		         cvShowImage("Draw_Rectangle",temp);
		 
			         if(cvWaitKey(100)==27)
			             break;
	     }
		
	    cvReleaseImage(&img);
        cvReleaseImage(&temp);
	    cvDestroyWindow("Draw_Rectangle");
	    return 0;
}
 void my_mouse_callback(int event,int x,int y,int flags,void*param)
 {
	    IplImage*img=(IplImage*)param;
        switch(event)
	     {
		     case CV_EVENT_MOUSEMOVE:
		     {
			             if(Drawing)
				         {
								box.width=x-box.x;
								box.height=y-box.y;
				         }
			  }
		      break;
			 case CV_EVENT_LBUTTONDOWN:
	         {
			        Drawing=true;
		            box=cvRect(x,y,0,0);
			 }
		     break;
		     case CV_EVENT_LBUTTONUP:
		        {
			        Drawing=false;
			        if (box.width<0)
				    {
				        box.x+=box.width;
				        box.width*=-1;
				    }
		             if (box.height<0)
				     {
				        box.y+=box.height;
				        box.height*=-1;
				     }
			         DrawRect(img,box);
			    }
		     break;
	     }
 }

						