Opencv实现画笔功能

本文实例为大家分享了opencv实现画笔功能的具体代码，供大家参考，具体内容如下

#include<iostream>
#include<opencv2/opencv.hpp>
 
using namespace std;
using namespace cv;
 
rect g_rectangle;
bool g_bdrawing = false;
rng g_rng(12345);
point g_ncurrpoint;
int g_nthick = 0, g_nblue = 255, g_ngreen = 255, g_nred = 0;
 
/*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)
 {
 //移动鼠标的时候
 case cv_event_mousemove:
 {
   g_ncurrpoint = point(x, y);
 }
 break;
 //点击鼠标左键时
 case cv_event_lbuttondown:
 {
   g_bdrawing = true;
   g_ncurrpoint = point(x, y);
 }
 break;
 //松开鼠标左键时
 case cv_event_lbuttonup:
 {
   g_bdrawing = false;
 }
 break;
 }
}
 
int main()
{
 mat srcimage(600, 800, cv_8uc3);
 mat tempimage;
 
 srcimage.copyto(tempimage);
 srcimage = scalar::all(0);
 
 namedwindow("【鼠标事件窗口】", 0);
 setmousecallback("【鼠标事件窗口】", onmouse, (void *)&srcimage);
 
 namedwindow("【滚动条窗口】", 0);
 createtrackbar("thick", "【滚动条窗口】", &g_nthick, 100, 0);
 createtrackbar("blue", "【滚动条窗口】", &g_nblue, 255, 0);
 createtrackbar("green", "【滚动条窗口】", &g_ngreen, 255, 0);
 createtrackbar("red", "【滚动条窗口】", &g_nred, 255, 0);
 
 char key;
 while (1)
 {
 if (g_bdrawing)
 {
 circle(srcimage, g_ncurrpoint, 0, scalar(g_nblue, g_ngreen, g_nred), g_nthick + 1);
 }
 
 imshow("【鼠标事件窗口】", srcimage);
 
 key = waitkey(1);
 if (key == 27)
 break;
 
 if (key == '1')
 srcimage = scalar::all(0);
 
 /*drawrectangle(srcimage, g_rectangle);
 imshow(window_name, srcimage);
 if (waitkey(10) == 27)
 break;*/
 }
 
 return 0;
}

按1是清除画面

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。