#pragma once

#include <QWidget>
#include <QLabel>
#include <QGraphicsView>
#include <QPixmap>
#include <QPainter>

#include <opencv2/opencv.hpp>

class CvImageViewWidget :public QLabel
{
	Q_OBJECT

public:
	CvImageViewWidget(QWidget* parent = Q_NULLPTR);
	virtual ~CvImageViewWidget() {}

public:
	void showImage(cv::Mat const& _himg);

	static void CvImageToQPixmap(cv::Mat const& _img, QPixmap& tarImg);
	static bool QImage2CvImage(QImage& from, cv::Mat& to);
	static void QPixmapToCvRegion(QPixmap const& _pix, cv::Rect2d& tarImg);

protected:
	void paintEvent(QPaintEvent* event) override;

private:
	cv::Mat curImage;
	QPixmap* curPixmap;
	// 实例化画家对象，this指定的是绘图设备
	QPainter painter;
};