// Assume that 'painter' is a QPainter object and 'window' is a QWidget object painter.setViewport(window->rect()); // set viewport to full size of window
// Assume that 'painter' and 'window' are defined as in example above, and that we have a QRect object called 'area' painter.setViewport(area); // set viewport to specific area within the windowThis code defines a custom rectangular area within the window and sets the QPainter viewport to match the specified area. This can allow for more precise control over where objects are drawn on the screen. These examples are part of the Qt Graphics View Framework which is a package library that provides 2D graphics functionalities to the users.