Printing sufficient curve thickness requires explicit increase of curve line width?

[Uwe]

Qwt 6 has a floating point based render engine and is using painter transformations ( scaling ) for PDF generation. When using non cosmetic pens ( https://qt-project.org/doc/qt-5.1/qt...tml#isCosmetic ) for the curve the lines in the PDF document will appear comparable to screen.

Note that when using non cosmetic pens, that the lines will be scaled when zooming in in a PDF viewer too.

Uwe