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

Have a go hero – Animating a cube

Try modifying the code to make the cube animated. To do that, have the scene inherit QObject, add an angle property of the float type to it (remember about the Q_OBJECT macro). Then, modify one of the glRotatef() lines to use the angle value instead of a constant value. Put the following code in main(), right before calling app.exec():

QPropertyAnimation animation(&scene, "angle");animation.setStartValue(0);animation.setEndValue(359);animation.setDuration(5000);animation.setLoopCount(-1);animation.start();

Remember to put a call to window()->update() in the setter for the angle property so that the scene is redrawn.