Strange behaviour with QPen

[franco.amato]

Hi to all,
I have to draw some lines in the paint event of an widget.
I set a pen with width = 1 but the real width of the pen is visibility bigger than 1 pixel and the width method
return 1 as value...odd

Here some code:

QPixmap temp = QPixmap( w, h ); // I draw on a pixel to cache
 
QPainter p( &temp );
p.setRenderHint( QPainter::Antialiasing, true );
p.fillRect( temp.rect(), Qt::lightGray );
 
// temporal line
QPen pen(Qt::black, 1); //<---- 1 pixel wide
pen.setStyle(Qt::SolidLine);
p.setPen(pen);
p.drawLine(0, 20, w, 20); //width of the line bigger than 1 pixel
qDebug() << "Pen width: " << pen.width(); // returns 1

QPixmap temp = QPixmap( w, h ); // I draw on a pixel to cache

QPainter p( &temp );
p.setRenderHint( QPainter::Antialiasing, true );
p.fillRect( temp.rect(), Qt::lightGray );

// temporal line
QPen pen(Qt::black, 1); //<---- 1 pixel wide
pen.setStyle(Qt::SolidLine);
p.setPen(pen);
p.drawLine(0, 20, w, 20); //width of the line bigger than 1 pixel
qDebug() << "Pen width: " << pen.width(); // returns 1

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Any idea?

Best