Qt图层结构——实现ROI选取、选框放缩移动、背景图像移动放缩_bigData1994pb的博客_qt图层

文件结构:

头文件boardlayer.h

#ifndef BOARDLAYER_H
#define BOARDLAYER_H

#include "qk2dview.h"
#include <QImage>

class BoardLayer : public Qk2dViewLayer
{
public:
    BoardLayer();

    const QImage& image() const { return m_image; }
    QTransform imageToWorld() const { return m_imgToWorld; }
    QTransform worldToImage() const { return m_worldToImg; }

private:
    void draw_ex(QPainter &painter) override;
    void calcTransform();

private:
    QImage m_image;
    QPointF m_origin;
    double m_pixelSize;
    QRectF m_worldRect; // image rect in world coordinate
    QTransform m_imgToWorld; // convert image coordinate to world coordinate
    QTransform m_worldToImg; // convert world coordinate to image coordinate
};



#endif // BOARDLAYER_H
#ifndef BOARDLA