backward direction duration during forward from jump onSeek onSeek onSeek onStep onStep onStep peek peek peek point progress seek seek seek step step step to tween via via

onStep() [1/3] tween<T, Ts...>& onStep ( typename detail::tweentraits< T, Ts... >::callbackType  callback ) Adds a callback that will be called when stepping occurs, accepting both the tween and its values. You can add as many callbacks as you want. Its arguments types must be equal to the argument types of a tween instance, preceded by a variable of the tween type. Callbacks can be of any callable type. It will only be called via tween::step() functions. For seek callbacks, see tween::onSeek(). Keep in mind that the function will be copied into an array, so any variable captured by value will also be copied with it. If the callback returns false, it will be called next time. If it returns true, it will be removed from the callback queue. Example: auto t = tweeny:from(0).to(100).during(100); // pass a lambda t.onStep([](tweeny::tween<int> & t, int v) { printf("%d ", v); return false; }); // pass a functor instance struct ftor { void operator()(tweeny::tween<int> & t, int v) { printf("%d ", v); return false; } }; t.onStep(ftor()); See also step seek onSeek Parameters callback A callback in with the prototype bool callback(tween<Ts...> & t, Ts...)