如何在Opencv 窗口画多边形并保存下来

最新推荐文章于 2025-06-12 16:24:12 发布

tzm0412

最新推荐文章于 2025-06-12 16:24:12 发布

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本文链接：https://blog.youkuaiyun.com/tzm0412/article/details/53943802

本文介绍了一个使用OpenCV库实现的基本绘图和鼠标交互功能的示例程序。该程序能够在图像上绘制线段，并记录鼠标点击的位置。通过鼠标左键点击开始绘制，拖动鼠标绘制线段，松开鼠标结束绘制。

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#include <opencv2/core/core.hpp>  
#include <opencv2/highgui/highgui.hpp>  
#include <stdio.h>  

static std::vector<std::vector<cv::Point>> vctvctPoint;
cv::Mat org = cv::Mat(750,1000,CV_8U,cv::Scalar(0)), img = cv::Mat(750, 1000, CV_8UC3, cv::Scalar(255,255,255,255)), tmp;
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  
{
	static std::vector<cv::Point> vctPoint;
	static cv::Point ptStart = (-1, -1);
	static cv::Point cur_pt = (-1, -1);
	char temp[16];
	if (event == CV_EVENT_LBUTTONDOWN)
	{
		sprintf(temp, "(%d,%d)", x, y);
		ptStart = cv::Point(x, y);
		vctPoint.push_back(ptStart);
		img.copyTo(tmp);
		cv::circle(tmp, ptStart, 2, cv::Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);  
		cv::putText(tmp, temp, ptStart, cv::FONT_HERSHEY_SIMPLEX, 0.5, cv::Scalar(0, 0, 0, 0), 1, 8);
		imshow("img", tmp);
	}
	else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))
	{
		sprintf(temp, "(%d,%d)", x, y);
		cur_pt = cv::Point(x, y);
		cv::line(img, vctPoint.back(), cur_pt, cv::Scalar(0, 255, 0, 0), 1, 8, 0);
		vctPoint.push_back(cur_pt);
		img.copyTo(tmp);

		circle(tmp, ptStart, 2, cv::Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);
		putText(tmp, temp, cur_pt, cv::FONT_HERSHEY_SIMPLEX, 0.5, cv::Scalar(0, 0, 0, 0));
		imshow("img", tmp);
	}
	else if (event == CV_EVENT_LBUTTONUP)
	{
		vctvctPoint.push_back(vctPoint);
		sprintf(temp, "(%d,%d)", x, y);
		cur_pt = cv::Point(x, y);
		cv::line(img, ptStart, cur_pt, cv::Scalar(0, 255, 0, 0), 1, 8, 0);  
		img.copyTo(tmp);
		circle(tmp, ptStart, 2, cv::Scalar(255, 0, 255, 0), CV_FILLED, CV_AA, 0);
		imshow("img", tmp);
	}
	cv::waitKey(0);
}

int main()
{
 	namedWindow("img");//定义一个img窗口  
 	setMouseCallback("img", on_mouse, 0);//调用回调函数  
 	imshow("img", img);
 	cv::waitKey(0);
}