Centers this node on the inputed point.
        
        :param      point | <QPointF>

def centerOn(self, point):
        """
        Centers this node on the inputed point.
        
        :param      point | <QPointF>
        """
        rect = self.rect()
        x = point.x() - rect.width() / 2.0
        y = point.y() - rect.height() / 2.0
        
        self.setPos(x, y)