Length of text in QFontMetrics

[Screamer2087]

Hello,

I'm trying to draw a rect around a text. I have the problem, that the rect is much too small in comparison to my text. I'm trying to get the length of the text with QFontMetrics. Here is a small example:

QPainter p(this);
 
    QFont font;
    font.setFamily("Arial");
    font.setPixelSize(10);
    font.setBold(false);
 
    QFontMetricsF metrics(font);
 
    qreal width = metrics.width("Test");
    p.drawRect(0,0,width, 20);
    p.drawText(QRect(0,0,width,20),"Test");
 
    qreal width1 = metrics.width("LongTest");
    p.drawRect(0,20,width1, 20);
    p.drawText(QRect(0,20,width1,20),"LongTest");
 
    qreal width2 = metrics.width("LongLongTest");
    p.drawRect(0,40,width2, 20);
    p.drawText(QRect(0,40,width2,20),"LongLongTest");

QPainter p(this);

    QFont font;
    font.setFamily("Arial");
    font.setPixelSize(10);
    font.setBold(false);

    QFontMetricsF metrics(font);

    qreal width = metrics.width("Test");
    p.drawRect(0,0,width, 20);
    p.drawText(QRect(0,0,width,20),"Test");

    qreal width1 = metrics.width("LongTest");
    p.drawRect(0,20,width1, 20);
    p.drawText(QRect(0,20,width1,20),"LongTest");

    qreal width2 = metrics.width("LongLongTest");
    p.drawRect(0,40,width2, 20);
    p.drawText(QRect(0,40,width2,20),"LongLongTest");

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The result in a QWidget you can see here:
Bildschirmfoto 2014-01-06 um 16.23.44.png

I'm using Qt 5 in a Kubuntu 13.04 system. Do I do anything wrong or is it a (huge) bug in Qt? I tested it with different font families and sizes. The result is always the same.

I hope you can help me!

Greetz
Screamer