c++qtqgraphicssceneqgraphicsitemqgraphicstextitem

How to center text in QGraphicsSimpleTextItem?

Sorry for my English, it's not my native language.

I have a problem - I need to center text in my QGraphicsSimpleTextItem. I inherited my class from QGraphicsSimpleTextItem. Do I need to override the paint() method or what should I do?

I've read about tightBoundingRect() in QFontMetrics. Can I set position of tight bounding rect in QGraphicsSimpleTextItem?

Thanks for your help!

Solution

  • Maybe something like this could work.

    void MySimpleTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
        QFont numberFont = QFont("Helvetica [Cronyx]", 20);
        painter->setFont(numberFont);
        painter->drawText(boundingRect(), Qt::AlignCenter, QString::number(itemIndex));
    }

    In my case this piece of code were to draw a number inside a QGraphicsEllipseItem, centered inside ellipse. I shaped my code a bit to fit your case, but essential point here is painter->drawText(boundingRect(), Qt::AlignCenter, QString::number(itemIndex));, where you use boundingRect() along with flag Qt::AlignCenter.