鼠标选择图像上点或者闭合多边形

#define AUTO 0
#define SEMI_AUTO 1
#define NON_AUTO 2
int model = 0;//工作模式全局变量
bool m_first = true;//手动起点标志全局变量
int whole_i;

void On_mouse_NON_AUTO(int event, int x, int y, int flags, void*);
void On_mouse_SEMI_AUTO(int event, int x, int y, int flags, void*);

int main()
{
string impath2 = "./img/497.bmp";
Mat img2 = imread(impath2,0);
cout << "工作模式选择（0-自动 1-半自动 2-手动）：" ;
cin >> model;
string wname = "半自动or手动";
imshow(wname, img2);
switch (model)
{
case AUTO:
cout << "自动" << endl;
break;
case SEMI_AUTO:
whole_i = 0;
setMouseCallback(wname, On_mouse_SEMI_AUTO, 0);
break;
case NON_AUTO:
m_first = true;
setMouseCallback(wname, On_mouse_NON_AUTO, 0);
whole_i = 0;
break;
}
waitKey( );
return 0;
}
void On_mouse_NON_AUTO(int event, int x, int y, int flags, void*)
{
Point pre_p,p0;
if (event == EVENT_LBUTTONDOWN)
{
if (m
8b6f
_first)
{
p0 = Point(x, y);
pre_p = p0;
m_first = false;
cout <<"起点："<< p0.x << " " << p0.y << endl;
}
else
{
pre_p = Point(x, y);
cout <<  pre_p.x << " " << pre_p.y << endl;
}
}
else if(event == CV_EVENT_RBUTTONDBLCLK)
{
m_first = true;
whole_i++;
cout << "结束一圈啦！" << endl;
}
}
void On_mouse_SEMI_AUTO(int event, int x, int y, int flags, void*)
{
Point pre_p;
if (event == CV_EVENT_LBUTTONDBLCLK)
{
pre_p = Point(x, y);
cout << pre_p.x << " " << pre_p.y << endl;
whole_i++;
}
}