QwtPlot->print on QPrinter

[Christian L. <chr...@la...>]

Hi Everybody,

I have a problem when trying to print a QwtPlot onto a QPrinter to get a
nice PDF. It works if I use an QImage as paint device and then print
that, though.

My code looks like this:

    QPrinter printer;
    printer.setOrientation(QPrinter::Portrait);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(filename);
    printer.setPageSize(QPrinter::A4);

    QPainter painter(&printer);
    QRect page = printer.pageRect();
    int w = page.width()-page.x();
    QRect rect(page.x(), page.y(), w, w/60*80);

    for (int i=0; i<plots.size(); ++i) {
        plots[i]->print(&painter, rect);
        if (i+1<plots.size()) printer.newPage();
    }

Here I add four pages with plots. Examples with Qt 4.3.2 and Qt 4.4.0 are shown
here:

    http://www.spect-ct.com/plots/qt-4.3.2.pdf
    http://www.spect-ct.com/plots/qt-4.4.0.pdf

I already tried Qwt 5.0.2, 5.1.0, 5.1.1 and trunk from today with the same
results. Is it just something special I do or is there something broken in
Qt/Qwt? Can try to produce a minimal example, but that could get
complicated and I just hope somebody can explain this behavior even from
this little information.

The workaround with a bitmap QImage does not look nearly as nice as the
direct PDF printing. Is there any other workaround I could try?

Thanks for your time.
Best regards,
 Christian

-- 
http://www.spect-ct.com/