class

Lottie::Easing

Inherits Reference < Object

Cubic-bezier easing y = f(x) on the unit square — a faithful port of rlottie's VInterpolator (Gecko SMIL KeySpline): 11-entry LUT, Newton-Raphson (4 iterations) when the initial slope is ≥ 0.02, binary subdivision (max 10 iterations, 1e-7) otherwise.

Constants

LUT_SIZE = 11

NEWTON_ITERATIONS = 4

NEWTON_MIN_SLOPE = 0.02

STEP = 1.0 / (LUT_SIZE - 1)

SUBDIVISION_MAX = 10

SUBDIVISION_PRECISION = 0.0000001

Constructors

new(x1 : Float64, y1 : Float64, x2 : Float64, y2 : Float64)

Source

new(o : Vec2, i : Vec2)

c1 = out tangent, c2 = in tangent (VInterpolator(outTangent, inTangent) in rlottie's interpolator factory).

Source

Instance methods

value(x : Float64) : Float64

Source