Mine

void ResourceScene::populate()
{
	QVector< QVector<int> > resources = m_pMatrix->getReservations();
	QVector< int> timeline;
	int start;
	int length;
	
	if (m_reservationItems.count() > 0)
	{
		for (int i = 0; i < m_reservationItems.count(); i++)
		{
			this->removeItem(m_reservationItems[i]);
			delete(m_reservationItems[i]);
		}
		m_reservationItems.clear();
	}
	
	for (int i = 0; i < resources.count(); i++)
	{
		timeline = resources.at(i);
		
		for (int j = 0; j < timeline.count(); j++)
		{
			if(timeline.at(j))
			{
				start = j;
				length = 0;
				while (timeline.at(start + length))
				{
					if ((start + ++length) > (timeline.count() - 1))
						break;
				}
				
				m_reservationItems.append(this->addRect(m_resourceAnnotationWidth + (j * m_columnWidth) + 2, 
														m_timeAnnotationHeight + (i * m_rowHeight) + 2, 
														(length * m_columnWidth) - 4, m_rowHeight - 4, 
														m_reservationPen, 
														m_reservationBrush));
				
				j = start + length;
			}
		}
		
		this->invalidate(this->sceneRect());
	}
}