ConstReadonlyease: 1The part eases distance over duration_ms, along easing, as a camera
animation does. The caller plans the glide, for example from the platform's
own fling physics, such as Android's OverScroller.
Readonlyfriction: 0The speed halves every half_life_ms, until it drops to stop_speed.
UIScrollView's normal deceleration is a half-life of 346 ms, and its fast
deceleration 69 ms.
How a part of a gesture's momentum slows from its release speed.
See
mln_momentum_decay_modelin the C API reference.