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.

Qt Code: 
  1. void pr::print(QVariant data)
  2.  
  3. {
  4.     QImage img = qvariant_cast<QImage>(data);
  5.     QPrinter printer;
  6.     QPrintDialog *dlg = new QPrintDialog(&printer,0);
  7.     if(dlg->exec() == QDialog::Accepted) {
  8.  
  9.         QPainter painter(&printer);
  10.         printer.setPageSize(QPrinter::A4);
  11.  
  12.         //painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
  13.         painter.drawImage(QPoint(0,0),img);
  14.         printer.setFullPage(true);
  15.         painter.end();
  16.     }
  17.  
  18. }
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