qt printer fit image to A4 paper

[neda]

I can Screenshot from a QML component using grabToImage and use QPrinter to print that image,

I want to display that image fit to A4 paper page or print to center of A4 paper.
But the image is draw left of paper.

void pr::print(QVariant data)
 
{
    QImage img = qvariant_cast<QImage>(data);
    QPrinter printer;
    QPrintDialog *dlg = new QPrintDialog(&printer,0);
    if(dlg->exec() == QDialog::Accepted) {
 
        QPainter painter(&printer);
        printer.setPageSize(QPrinter::A4);
 
        //painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
        painter.drawImage(QPoint(0,0),img);
        printer.setFullPage(true);
        painter.end();
    }
 
}

void pr::print(QVariant data)

{
    QImage img = qvariant_cast<QImage>(data);
    QPrinter printer;
    QPrintDialog *dlg = new QPrintDialog(&printer,0);
    if(dlg->exec() == QDialog::Accepted) {
        
        QPainter painter(&printer);
        printer.setPageSize(QPrinter::A4);

        //painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
        painter.drawImage(QPoint(0,0),img);
        printer.setFullPage(true);
        painter.end();
    }

}

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[anda_skoa]

With that code it should be painted at the topleft.
Does it not do that?

Cheers,
_

[neda]

With that code it should be painted at the topleft.
Does it not do that?

Cheers,
_

Thank you.
Yes.
But I want draw image in top center of paper.

[anda_skoa]

Well, then you probably want to calculate the correct x value for the drawig position instead of using 0

Cheers,
_

[neda]

Well, then you probably want to calculate the correct x value for the drawig position instead of using 0

Cheers,
_

Yes that's right.
But howØŸ

I use this code:

int imgW=img.width();
        int pW=printer.paperRect().width();
        int x=(pW-imgW)/2;
        painter.drawImage(QPoint(x,10),img);

int imgW=img.width();
        int pW=printer.paperRect().width();
        int x=(pW-imgW)/2;
        painter.drawImage(QPoint(x,10),img);

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Is this best solution?

[anda_skoa]

Looks about right, though I can't find a paperRect() method that is callable without argument.

You could alternatively also try painter.device()->width().

Also maybe have "x" as a qreal and use the drawImage() overload that takes a QPointF.

Cheers,
_