#include "stdafx.h"
#include 
#pragma comment(lib,"opencv_world300.lib")//加载lib库，不然提示找不到函数
using namespace cv;
const char *pstrWindowsMouseDrawTitle = "绘图";
// 鼠标消息的回调函数
void on_mouse(int event, int x, int y, int flags, void* param)
{
	static bool s_bMouseLButtonDown = false;
	static CvPoint s_cvPrePoint = cvPoint(0, 0);
	switch (event)
	{
	case CV_EVENT_LBUTTONDOWN:
		s_bMouseLButtonDown = true;
		s_cvPrePoint = cvPoint(x, y);
		break;
	case  CV_EVENT_LBUTTONUP:
		s_bMouseLButtonDown = false;
		break;
	case CV_EVENT_MOUSEMOVE:
		if (s_bMouseLButtonDown)
		{
			CvPoint cvCurrPoint = cvPoint(x, y);
			cvLine((IplImage*)param, s_cvPrePoint, cvCurrPoint, CV_RGB(0, 0, 20), 3);
			s_cvPrePoint = cvCurrPoint;
			cvShowImage(pstrWindowsMouseDrawTitle, (IplImage*)param);
		}
		break;
	}
}
int main()
{	
	const int MAX_WIDTH = 500, MAX_HEIGHT = 400;
	const char *pstrSaveImageName = "MouseDraw.jpg";
	IplImage *pSrcImage =  cvCreateImage(cvSize(MAX_WIDTH, MAX_HEIGHT), IPL_DEPTH_8U, 3);
	cvSet(pSrcImage, CV_RGB(255, 255, 255)); //可以用cvSet()将图像填充成白色
	cvNamedWindow(pstrWindowsMouseDrawTitle, CV_WINDOW_AUTOSIZE);
	cvShowImage(pstrWindowsMouseDrawTitle, pSrcImage);
	//设置鼠标函数地址
	cvSetMouseCallback(pstrWindowsMouseDrawTitle, on_mouse, (void*)pSrcImage);
	int c = 0;
	do{
		c = cvWaitKey(0);
		switch ((char)c)
		{
		case 'r':
			cvSet(pSrcImage, CV_RGB(255, 255, 255));
			cvShowImage(pstrWindowsMouseDrawTitle, pSrcImage);
			break;
		case 's':
			cvSaveImage(pstrSaveImageName, pSrcImage);
			break;
		}
	}while (c > 0 && c != 27);
	//销毁窗口释放资源
	cvDestroyWindow(pstrWindowsMouseDrawTitle);
	cvReleaseImage(&pSrcImage);
	return 0;
} 

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