MarkerLineItem::MarkerLineItem(qreal sceneWidth, QGraphicsItem *parent)
: QGraphicsObject(parent),
_boundingRect(0, 0, sceneWidth, 1),
MarkerLineItem::MarkerLineItem(qreal sceneWidth, QGraphicsItem *parent)
: QGraphicsObject(parent),
_boundingRect(0, 0, sceneWidth, 1),