Print QPixmap

[Piotrek102]

Hello,
I would like to print a pixmap to a pdf file and via QPrintDialog also on paper. However, I have a problem, every time the pixmap prints as a very small image. How can I enlarge it to a full page up to A4?

QPixmap pixmap = this->grab();
QPrinter printer(QPrinter::HighResolution);
printer.setPageMargins(QMarginsF(0,0,0,0));
QPainter painter;
painter.begin(&printer);
painter.drawPixmap (0, 0, pixmap.scaled(600, 800));
painter.end();
QPrintDialog dialog(&printer);
dialog.exec();

[Christian Ehrlicher]

Please take a look into the documentation on how to scale a pixmap so it fits to your page.

[JoeCFD]

https://doc.qt.io/qt-5/qprinter.html#setPageSize
try to create a svg file for scaling. You can easily lose resolution with image for scaling.

[Piotrek102]

Ok, but I have the following errors now

[JoeCFD]

https://doc.qt.io/qt-5/qprinter.html#paperRect-1 you need unit

[Christian Ehrlicher]

@JoeCFD said in Print QPixmap:

https://doc.qt.io/qt-5/qprinter.html#paperRect-1 you need unit

No, pageRect() without a unit was deprecated in Qt5 and removed in Qt6 but the documentation here was not adjusted (will do asap). The deprecation documentation tells how to replace it:

"Use pageLayout().fullRectPixels(resolution()) instead."

[Piotrek102]

Ok, I made it with this code

I got the pdf scaled to the page as I wanted, thank you for your help!

[Christian Ehrlicher]

@Piotrek102 Thx for the information, the Qt6 documentation will be updated shortly. Please mark the topic as solved then.

/gerrit commit for reference: https://codereview.qt-project.org/c/qt/qtbase/+/421268