Find maximum size of a given font that will fit a given size

[Lykurg]

Once I had the same problem, but I don't have found a build in function. Another solution could be that you paint the text with a default size (with a few checks if you want the text to be drawn in 1, 2, 3, ... lines) and then simply scale the image. If you can live with the lower quality that could be also an option. I had chosen the solution with finding the best font size.

[Skylark]

OK thanks, good to know someone has been in the same boat as me in the past.

[eean]

My requirements are a bit different, but here's my code.

void
TextItem::setGeometry(const QRectF& rect)
{
    QFont theFont = font();
 
    int size = qMin(static_cast<int>(rect.height()), 40);
 
    theFont.setPixelSize(size);
    QFontMetricsF fm(theFont);
    while(fm.width(toPlainText()) > rect.width())
    {
        size -= 5;
        theFont.setPixelSize(size);
        fm = QFontMetricsF(theFont);      
    }
 
    setFont(theFont);
    setPos(rect.topLeft());
}

void
TextItem::setGeometry(const QRectF& rect)
{
    QFont theFont = font();
    
    int size = qMin(static_cast<int>(rect.height()), 40);
    
    theFont.setPixelSize(size);
    QFontMetricsF fm(theFont);
    while(fm.width(toPlainText()) > rect.width())
    {
        size -= 5;
        theFont.setPixelSize(size);
        fm = QFontMetricsF(theFont);      
    }
    
    setFont(theFont);
    setPos(rect.topLeft());
}

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