Qt: How to set the size of Pixmap?

[sonulohani]

I want to set the size of pixmap. The code is defined below.

QPixmap pix("alarm.png");
 painter->drawPixmap(pointf[i], pix);

QPixmap pix("alarm.png");
 painter->drawPixmap(pointf[i], pix);

To copy to clipboard, switch view to plain text mode 

It is showing a bigger image.
How to set the size?