毛星云opencv之用鼠标进行交互操作

代码如下：

#include <opencv2/opencv.hpp>
#include"opencv2/highgui/highgui.hpp"
#include<iostream>

using namespace std;
using namespace cv;

#define WINDOW_NAME "【程序窗口】"

void on_MouseHandle(int event, int x, int y, int flags, void* param);
void DrawRectangle(cv::Mat& img,cv::Rect Box);
void ShowHelpText();

Rect g_rectangle;
bool g_bDrawingBox = false;
RNG g_rng(12345);

int main(int argc,char** argv)
{
   g_rectangle = Rect(-1, -1, 0, 0);
   Mat srcImage(600, 800, CV_8UC3), tempImage;
   srcImage.copyTo(tempImage);
   g_rectangle = Rect(-1, -1, -0, 0);
   srcImage = Scalar::all(0);

namedWindow(WINDOW_NAME);
setMouseCallback(WINDOW_NAME,on_MouseHandle,(void*)&srcImage);

while (1)
   {
       srcImage.copyTo(tempImage);
       if (g_bDrawingBox)DrawRectangle(tempImage, g_rectangle);

imshow(WINDOW_NAME, tempImage);
       if (waitKey(10) == 27)
           break;
   }
   return 0;
}

void on_MouseHandle(int event, int x, int y, int flags, void* param)
{
   Mat& image = *(cv::Mat*)param;
   switch (event)
   {
   case EVENT_MOUSEMOVE:
       {
           if (g_bDrawingBox)
           {
               g_rectangle.width = x - g_rectangle.x;
               g_rectangle.height = y - g_rectangle.y;

}
       }
       break;
   case EVENT_LBUTTONDOWN:
   {
       g_bDrawingBox = true;
       g_rectangle = Rect(x,y,0,0);
   }
   break;
   case EVENT_LBUTTONUP:
   {
       g_bDrawingBox = false;
       if (g_rectangle.width < 0)
       {
           g_rectangle.x += g_rectangle.width;
           g_rectangle.width *= -1;

}
       if (g_rectangle.height<0)
       {
           g_rectangle.y += g_rectangle.height;
           g_rectangle.height *= -1;

}
       DrawRectangle(image, g_rectangle);
   }
   break;
   }
}

void DrawRectangle(cv::Mat& img,cv::Rect box)
{
rectangle(img, box.tl(), box.br(), Scalar(g_rng.uniform(0, 255), g_rng.uniform(0, 255), g_rng.uniform(0, 255)));
}
运行结果如图：

用鼠标左键画就行

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