Game Programming using Qt 5 Beginner's Guide - Second Edition

Game loops

Most games revolve around some kind of game loop. It is usually some kind of function that is called repeatedly, and its task is to progress the game—process input events, move objects around, calculate and execute actions, check win conditions, and so on. Such an approach is very imperative and usually results in a very complex function that needs to know everything about everybody (this kind of anti-pattern is sometimes called a god object pattern). In QML (which powers the Qt Quick framework), we aim to separate responsibilities and declare well-defined behaviors for particular objects. Therefore, although it is possible to set up a timer that will periodically call a game loop function, this is not the best possible approach ...