void EffectItemBase::createText(const QString &text)
{
    QGraphicsSimpleTextItem * textItem = new QGraphicsSimpleTextItem(text, this);
    QFont font = textItem->font();
    font.setPointSize(FontSize);
    textItem->setFont(font);
    QRectF textBox = textItem->boundingRect();
    QPointF offset = rect().center() - textBox.center();
    textItem->translate(offset.x(), offset.y());
}