Timers

Timers run a function later. They count in steps: 60 steps = 1 second.

Function	What it does	Example
TimerId after(int steps, std::function<void()> fn)	Calls fn once, steps steps from now (at least 1).	after(30, [this] { visible = true; });
TimerId every(int steps, std::function<void()> fn)	Calls fn every steps steps, until it is cancelled or the instance is destroyed.	every(60, [this] { spawn<Bullet>(x, y, "Instancias"); });
TimerId afterSeconds(float seconds, std::function<void()> fn)	Same as after, in seconds.	afterSeconds(2.5f, [this] { destroy(); });
void cancel(TimerId id)	Cancels a timer of this instance. It works even inside the timer itself.	cancel(blink_);
TimerId tween(float from, float to, float seconds, std::function<void(float)> apply, Ease ease = Ease::Linear)	Takes a value from from to to in seconds seconds, calling apply on every step. Ease::Out slows down at the end; there are also In, InOut and Back.	tween(y, y - 20, 0.3f, [this](float v) { y = v; }, Ease::Out);

Notes

• TimerId identifies the timer. An empty TimerId has value == 0.
• The timers run at the beginning of the step, before onUpdate.
• When the instance is destroyed, its timers go away with it.
• The [this] in the lambda lets you use the instance’s variables and functions. See Lambdas.

See Wait and repeat for examples.