A paint device in Qt is a drawable 2D surface. ... The default coordinate system of a paint device has its origin located at the top left position. ... It is possible to transform the coordinate system when drawing in a paint device. ... It can translate, scale, shear and rotate everything from simple lines to text and pixmaps. The following QPainter functions transform the coordinate system: . ... scale() . ... In addition, the QPixmap::xForm() function can scale, shear and rotate a pixmap. ...