virtual void mousePressEvent(QMouseEvent * event);
virtual void mouseMoveEvent(QMouseEvent * event);
void adjustScale(int maximum);
void setZone(int start, int end);
QPoint zone();
virtual void mousePressEvent(QMouseEvent * event);
virtual void mouseMoveEvent(QMouseEvent * event);
void adjustScale(int maximum);
void setZone(int start, int end);
QPoint zone();