#include<opencv2/core/core.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/opencv.hpp>
#include<iostream>
using namespace cv;
Mat org, dst, img, tmp;
void on_mouse(int event, int x, int y, int flags, void *ustc) {
static Point pre_pt = (-1, -1);//初始坐标
static Point cur_pt = (-1, -1);//实时坐标
char temp[16]; //显示的(x,y)字符串
if (event == CV_EVENT_LBUTTONDOWN) {//左键按下,读取初始坐标,并在图像上该点处划圆
org.copyTo(img);
sprintf(temp, "(%d,%d)", x, y); //格式化输出
pre_pt = Point(x, y);
putText(img, temp, pre_pt, FONT_HERSHEY_SIMPLEX, 0.5, Scalar(0, 0, 0, 255), 1, 8);//在窗口上显示坐标
circle(img, pre_pt, 2, Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);//划圆
imshow("img", img);
}
else if (event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON)){//左键没有按下的情况下鼠标移动的处理函数
img.copyTo(tmp);
sprintf(temp, "(%d,%d)", x, y);
cur_pt = Point(x, y);
putText(tmp, temp, cur_pt, FONT_HERSHEY_SIMPLEX, 0.5, Scalar(0, 0, 0, 255));//只是实时显示鼠标移动的坐标
imshow("img", tmp);
}
else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON)){ //左键按下时,鼠标移动,则在图像上划矩形
img.copyTo(tmp);
sprintf(temp, "(%d,%d)", x, y);
cur_pt = Point(x, y);
putText(tmp, temp, cur_pt, FONT_HERSHEY_SIMPLEX, 0.5, Scalar(0, 0, 0, 255));
rectangle(tmp, pre_pt, cur_pt, Scalar(0, 255, 0, 0), 1, 8, 0);//在临时图像上实时显示鼠标拖动时形成的矩形
imshow("img", tmp);
}
else if (event == CV_EVENT_LBUTTONUP) {//左键松开,将在图像上划矩形
org.copyTo(img);
sprintf(temp, "(%d,%d)", x, y);
cur_pt = Point(x, y);
putText(img, temp, cur_pt, FONT_HERSHEY_SIMPLEX, 0.5, Scalar(0, 0, 0, 255));
circle(img, pre_pt, 2, Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);
rectangle(img, pre_pt, cur_pt, Scalar(0, 255, 0, 0), 1, 8, 0);//根据初始点和结束点,将矩形画到img上
imshow("img", img);
img.copyTo(tmp);
//截取矩形包围的图像,并保存到dst中
int width = abs(pre_pt.x - cur_pt.x);
int height = abs(pre_pt.y - cur_pt.y);
if (width == 0 || height == 0) {
printf("width == 0 || height == 0");
return;
}
dst = org(Rect(min(cur_pt.x, pre_pt.x), min(cur_pt.y, pre_pt.y), width, height));
namedWindow("dst"); //即新建立一个窗口进行输出结果
imshow("dst", dst);
waitKey(0);
}
}
void main() {
org = imread("1.png");
org.copyTo(img);
org.copyTo(tmp);
namedWindow("img");//定义一个img窗口
setMouseCallback("img", on_mouse, 0);//调用回调函数
imshow("img", img);
waitKey(0);
}
opencv_鼠标事件
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转载自blog.csdn.net/csdn_dzh/article/details/79214078
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