Opencv使用鼠标任意形状的抠图

CV_EVENT_MOUSEMOVE   =0,  //鼠标移动
CV_EVENT_LBUTTONDOWN  =1,  //按下左键
CV_EVENT_RBUTTONDOWN  =2,  //按下右键
CV_EVENT_MBUTTONDOWN  =3,  //按下中键
CV_EVENT_LBUTTONUP   =4,  //放开左键
CV_EVENT_RBUTTONUP   =5,  //放开右键
CV_EVENT_MBUTTONUP   =6,  //放开中键
CV_EVENT_LBUTTONDBLCLK =7,  //左键双击
CV_EVENT_RBUTTONDBLCLK =8,  //右键双击
CV_EVENT_MBUTTONDBLCLK =9,  //中键双击
CV_EVENT_MOUSEWHEEL   =10, //滚轮滚动
CV_EVENT_MOUSEHWHEEL  =11  //横向滚轮滚动

CV_EVENT_FLAG_LBUTTON  =1,  //左键拖拽
CV_EVENT_FLAG_RBUTTON  =2,  //右键拖拽
CV_EVENT_FLAG_MBUTTON  =4,  //中键拖拽
CV_EVENT_FLAG_CTRLKEY  =8,  //按住CTRL拖拽
CV_EVENT_FLAG_SHIFTKEY =16, //按住Shift拖拽
CV_EVENT_FLAG_ALTKEY  =32  //按住ALT拖拽

if (event == CV_EVENT_LBUTTONDOWN)
 {
 //画起点
 }

else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))
 {
 //在拖动过程中画线
 }

else if (event == CV_EVENT_LBUTTONUP)
 {
  //在结束之后进行起点和终点的连接
 }

const cv::Point * ppt[1] = { &vctPoint[0] };//取数组的首地址
 int len = vctPoint.size();
 int npt[] = { len };
 org.copyTo(maskImage);
 maskImage.setTo(cv::Scalar(0,0, 0, 0));
 cv::fillPoly(maskImage, ppt, npt, 1, cv::Scalar(0,255, 255, 255));

#include <iostream> 
#include <vector>
#include <opencv.hpp>
#include <opencv2\opencv.hpp>
#include <opencv2/highgui/highgui.hpp> 
#include <opencv2/core/core.hpp>
 
static std::vector<std::vector<cv::Point>> vctvctPoint;
cv::Mat org = cv::imread("images/kaola.jpg");
cv::Mat dst, maskImage;
static std::vector<cv::Point> vctPoint;
static cv::Point ptStart = (-1, -1); //初始化起点
static cv::Point cur_pt = (-1, -1); //初始化临时节点
char temp[16];
 
 
void on_mouse(int event, int x, int y, int flags, void *ustc)//event鼠标事件代号，x,y鼠标坐标，flags拖拽和键盘操作的代号 
{
 if (event == CV_EVENT_LBUTTONDOWN)
 {
 std::cout << "x:" << x << " y:" << y << std::endl;
 ptStart = cv::Point(x, y);
 vctPoint.push_back(ptStart);
  cv::circle(org, ptStart, 1, cv::Scalar(255, 0, 255), CV_FILLED, CV_AA, 0);
 cv::imshow("图片", org);
 //cv::putText(tmp, temp, ptStart, cv::FONT_HERSHEY_SIMPLEX, 0.5, cv::Scalar(0, 0, 0, 0), 1, 8);
 }
 else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))
 {
 std::cout << "x:" << x << " y:" << y << std::endl;
 cur_pt = cv::Point(x, y);
 cv::line(org, vctPoint.back(), cur_pt, cv::Scalar(0, 255, 0, 0), 1, 8, 0);
 cv::circle(org, cur_pt, 1, cv::Scalar(255, 0, 255), CV_FILLED, CV_AA, 0);
 cv::imshow("图片", org);
 vctPoint.push_back(cur_pt);
 //cv::putText(tmp, temp, cur_pt, cv::FONT_HERSHEY_SIMPLEX, 0.5, cv::Scalar(0, 0, 0, 0));
 }
 else if (event == CV_EVENT_LBUTTONUP)
 { 
 std::cout << "x:" << x << " y:" << y << std::endl;
 cur_pt = cv::Point(x, y);
 cv::line(org, ptStart, cur_pt, cv::Scalar(0, 255, 0, 0), 1, 8, 0);
 cv::circle(org, cur_pt, 1, cv::Scalar(255, 0, 255), CV_FILLED, CV_AA, 0);
 cv::imshow("图片", org);
 vctPoint.push_back(cur_pt);
 vctvctPoint.push_back(vctPoint); 
 //把点构成任意多边形进行填充
 const cv::Point * ppt[1] = { &vctPoint[0] };//取数组的首地址
 int len = vctPoint.size();
 int npt[] = { len };
 // cv::polylines(org, ppt, npt, 1, 1, cv::Scalar(0,0, 0, 0), 1, 8, 0);  
 org.copyTo(maskImage);
 maskImage.setTo(cv::Scalar(0,0, 0, 0));
 cv::fillPoly(maskImage, ppt, npt, 1, cv::Scalar(0,255, 255, 255)); 
 org.copyTo(dst ,maskImage);
 cv::imshow("抠图",dst);
 cv::waitKey(0);
 }
}
int main()
{
 //鼠标点击
 cv::namedWindow("图片");//定义一个img窗口 
 cv::setMouseCallback("图片", on_mouse, 0);//调用回调函数 
 cv::imshow("图片", org);
 cv::waitKey(0);
 return 0;
}