Standardbibliothek

Antra::Easing

import Antra::Easing

Easing curves for animation: Robert Penner's equations, as in raylib's reasings.h.

Easing.ease(kind, t, b, c, d) goes from b to b + c while the time t runs from 0 to the duration d; Easing.apply(kind, x) is the same on 0..1. A kind is :linear or a curve with _in, _out or _in_out: sine, quad, cubic, circ, expo, back, bounce, elastic (Easing.KINDS lists them all).

Example:

# x from 100 to 700 within 60 frames, slowing down at the end
val x = Easing.ease(:cubic_out, frame, 100, 600, 60)
Easing.apply(:quad_in, 0.5)   # => 0.25

Überblick#

Easing-Kurven für Animationen (Robert Penners Gleichungen, wie raylibs reasings.h). Easing.ease(kind, t, b, c, d) läuft von b nach b + c, während die Zeit t von 0 bis zur Dauer d geht; Easing.apply(kind, x) ist dasselbe auf 0..1. Kurven: :linear sowie sine, quad, cubic, circ, expo, back, bounce, elastic jeweils mit _in, _out oder _in_out (Easing.KINDS listet alle).

import Antra::Easing

println(Easing.ease(:cubic_out, 60, 100, 600, 60))   # 700 (am Ende der 60 Frames)
println(Easing.apply(:quad_in, 0.5))                 # 0.25

applyfn</>

fn apply(kind, x)

ease on the unit interval: the curve's value at x (0..1) going from 0 to 1.

Example:

Easing.apply(:quad_in, 0.5)   # => 0.25

easefn</>

fn ease(kind, t, b, c, d)

The value at time t (0..d) of a curve from b to b + c.

Example:

Easing.ease(:linear, 30, 0, 100, 60)      # => 50
Easing.ease(:cubic_out, 60, 100, 600, 60) # => 700

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