Mastering GUI Programming with Python

Adding images

Qt offers a number of classes related to the use of images in an application, but, for simply displaying a picture in your GUI, the most appropriate is QPixmap. QPixmap is a display-optimized image class, which can load many common image formats including PNG, BMP, GIF, and JPEG.

To create one, we simply need to pass QPixmap a path to an image file:

        logo = qtg.QPixmap('logo.png')

Once loaded, a QPixmap object can be displayed in a QLabel or QButton object, as follows:

        heading.setPixmap(logo)

Note that labels can only display a string or a pixmap, but not both.

Being optimized for display, the QPixmap objects offer only minimal editing functionality; however, we can do simple transformations such as scaling:

 if logo.width() ...