Crate easings

There are a few ports of Robert Penner’s easing functions in crates.io. This one is different in that all functions take a t ∈ [0, 1] and return a value in the interval [0, 1].

Derived from https://github.com/warrenm/AHEasing/blob/master/AHEasing/easing.c

Functions

back_in

Modeled after the overshooting cubic y = x^3-xsin(xpi)

back_in_out

Modeled after the piecewise overshooting cubic function:

back_out

Modeled after overshooting cubic y = 1-((1-x)^3-(1-x)*sin((1-x)*pi))

bounce_in

Each bounce is modelled as a parabola

bounce_in_out

Each bounce is modelled as a parabola

bounce_out

Each bounce is modelled as a parabola

circular_in

Modeled after shifted quadrant IV of unit circle

circular_in_out

Modeled after the piecewise circular function

circular_out

Modeled after shifted quadrant II of unit circle

cubic_in

Modeled after the cubic y = x^3

cubic_in_out

Modeled after the piecewise cubic

cubic_out

Modeled after the cubic y = (x - 1)^3 + 1

elastic_in

Modeled after the damped sine wave y = sin(13pi/2*x)*pow(2, 10 * (x - 1))

elastic_in_out

Modeled after the piecewise exponentially-damped sine wave:

elastic_out

Modeled after the damped sine wave y = sin(-13pi/2*(x + 1))*pow(2, -10x) + 1

exponential_in

Modeled after the exponential function y = 2^(10(x - 1))

exponential_in_out

Modeled after the piecewise exponential

exponential_out

Modeled after the exponential function y = -2^(-10x) + 1

linear

Modeled after the line y = x

quadratic_in

Modeled after the parabola y = x^2

quadratic_in_out

Modeled after the piecewise quadratic

quadratic_out

Modeled after the parabola y = -x^2 + 2x

quartic_in

Modeled after the quartic y = x^4

quartic_in_out

Modeled after the piecewise quartic

quartic_out

Modeled after the quartic y = 1 - (x - 1)^4

quintic_in

Modeled after the quintic y = x^5

quintic_in_out

Modeled after the piecewise quintic

quintic_out

Modeled after the quintic y = (x - 1)^5 + 1

sin_in

Modeled after quarter-cycle of sine wave

sin_in_out

Modeled after half sine wave

sin_out

Modeled after quarter-cycle of sine wave (different phase)