Opencv实现可调色画笔的功能

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#include<iostream>  #include<opencv2/opencv.hpp>    using namespace std;  using namespace cv;    bool g_bDrawing = false;  RNG g_rng(12345);  Point g_nCurrPoint;  Point g_nPrePoint = Point(0,0); int g_nThick = 0, g_nBlue = 0, g_nGreen = 0, g_nRed = 255;    /*注意：不能在毁掉函数中写入未初始化的矩阵类，所以需要用时，需要写一个标志位，然后再在while(1)循环内使用*/  void onMouse(int event, int x, int y, int flag, void *param)  {      Mat &img = *(cv::Mat*)param;        switch (event)      {           //点击鼠标左键时      case CV_EVENT_LBUTTONDOWN:      {g_bDrawing = true;g_nPrePoint = Point(x, y);      }          break;          //松开鼠标左键时      case CV_EVENT_LBUTTONUP:      {  g_bDrawing = false;      }          break;          //移动鼠标的时候      case CV_EVENT_MOUSEMOVE:      {  if(g_bDrawing){g_nCurrPoint = Point(x, y); //将前一点与现在鼠标所在的点连接，色彩由scalar内参数调整，line(img, g_nPrePoint, g_nCurrPoint, Scalar(g_nBlue, g_nGreen, g_nRed),g_nThick + 1, 4);  //line函数g_nPrePoint=g_nCurrPoint;}    }           break;}}  int main()  {      Mat srcImage(600, 800, CV_8UC3);      Mat tempImage;        srcImage.copyTo(tempImage);      srcImage = Scalar::all(255);        namedWindow("【鼠标事件窗口】", 1);      setMouseCallback("【鼠标事件窗口】", onMouse, (void *)&srcImage);    //创建颜色控制窗口  //  namedWindow("【滚动条窗口】", 1);      createTrackbar("thick", "【鼠标事件窗口】", &g_nThick, 10, 0);       createTrackbar("Red", "【鼠标事件窗口】", &g_nRed, 255, 0);      createTrackbar("Green", "【鼠标事件窗口】", &g_nGreen, 255, 0);    createTrackbar("Blue", "【鼠标事件窗口】", &g_nBlue, 255, 0);////后期想法：再创建显示颜色合成窗口，让人知道调试了什么颜色、、、、//Mat imag2;//Mat ImageROI(srcImage,cv::Rect(srcImage.cols-imag2.cols,srcImage.rows-imag2.rows)); //imag2.copyTo(srcImageROI);   char key;      while (1)      {          imshow("【鼠标事件窗口】", srcImage);            key = waitKey(1);          if (key == 27)              break;            if (key == 'r')              srcImage = Scalar::all(255);         if (key == 's')    imwrite("MouseDraw.jpg", srcImage);                    } return 0;      }

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