connect(m_scene, SIGNAL(newRect(QGraphicsRectItem *)), this , SLOT(slotNewRect(QGraphicsRectItem *)));
connect(m_scene, SIGNAL(newText(QGraphicsTextItem *)), this , SLOT(slotNewText(QGraphicsTextItem *)));
connect(zoom_slider, SIGNAL(valueChanged(int)), this , SLOT(slotUpdateZoom(int)));
connect(m_scene, SIGNAL(newRect(QGraphicsRectItem *)), this , SLOT(slotNewRect(QGraphicsRectItem *)));
connect(m_scene, SIGNAL(newText(QGraphicsTextItem *)), this , SLOT(slotNewText(QGraphicsTextItem *)));
connect(zoom_slider, SIGNAL(valueChanged(int)), this , SLOT(slotUpdateZoom(int)));