QGraphicsItem flickering

[wysota]

You are drawing outside your boundingRect(). Calling setPos() in the item constructor doesn't make much sense either.

[michalk]

Do you mean adding adjust*2 when I specify rectf width and height?

QRectF BallItem::boundingRect() const
{
qreal adjust = 0.5;
QRectF rectf = QRectF(-iRadius-adjust, -iRadius-adjust, iRadius*2 + adjust*2
     , iRadius*2  + adjust*2);
 
return rectf;
}

QRectF BallItem::boundingRect() const
{
qreal adjust = 0.5;
QRectF rectf = QRectF(-iRadius-adjust, -iRadius-adjust, iRadius*2 + adjust*2
     , iRadius*2  + adjust*2);

return rectf;
}

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[wysota]

Simplify the code (QRectF has a bunch of nice methods). And what's the purpose of calling setPos() in the constructor?

[michalk]

I am going to rewrite it so it will look better.

If it comes to constructor, hmm well it is a remaining from my try-outs, setPos() is going to be removed. Now I know it is not the best way to do so, but when I started with QGraphics... stuff I didn't know that.