private:
void paintEvent(QPaintEvent *event);
void mouseMoveEvent(QMouseEvent *e);
void mousePressEvent(QMouseEvent *e);
void mouseReleaseEvent(QMouseEvent *);
private:
void paintEvent(QPaintEvent *event);
void mouseMoveEvent(QMouseEvent *e);
void mousePressEvent(QMouseEvent *e);
void mouseReleaseEvent(QMouseEvent *);