else {
if (m_previous == NULL) {
m_previous = new QGraphicsRectItem(0, 0, previousItem.w(), previousItem.h());
m_previous->setBrush(QColor(200, 200, 0, 20));
m_previous->setPen(QPen(Qt::white, 0, Qt::DotLine));
else {
if (m_previous == NULL) {
m_previous = new QGraphicsRectItem(0, 0, previousItem.w(), previousItem.h());
m_previous->setBrush(QColor(200, 200, 0, 20));
m_previous->setPen(QPen(Qt::white, 0, Qt::DotLine));