struct

Lottie::Bezier

Inherits Struct < Value < Object

Cubic bezier over Float32 — a faithful port of rlottie's VBezier including its approximations, because animated positions with "to"/"ti" tangents interpolate ALONG the bezier by arc length (Value<Position>::at → tAtLength), and tAtLength's bisection tolerance is 0.01 LENGTH UNITS with alpha-max/beta-min hypot (≈7% error) — the exact numeric behavior is part of the twin contract, not just an implementation detail.

Constructors

from_points(p1 : Vec2, p2 : Vec2, p3 : Vec2, p4 : Vec2) : Bezier

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new(x1 : Float32, y1 : Float32, x2 : Float32, y2 : Float32, x3 : Float32, y3 : Float32, x4 : Float32, y4 : Float32)

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Instance methods

length

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point_at(t : Float32) : Vec2

De Casteljau, ordered like VBezier::pointAt ("numerically more stable").

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split

VBezier::split — both halves.

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split_left(t : Float32) : Tuple(Bezier, Bezier)

VBezier::parameterSplitLeft — returns {left, remaining-right}.

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t_at_length(l : Float32, total_length : Float32) : Float32

VBezier::tAtLength — bisection over the split parameter with a 0.01 length-unit stop tolerance.

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