A key could only ease quadratically, which makes quick moves like a
sword swing feel soft. Animators know the Penner curves from CSS,
GSAP and Unity, so a key now offers all of them.
- Ten curves (Sine, Quad, Cubic, Quart, Quint, Expo, Circ, Back,
Elastic, Bounce), each in, out and in-out, next to Linear and Step.
- The inspector shows two fields instead of one long list: Easing,
and Direction only when a curve is picked. Switching the curve
keeps the direction. Coming from Linear or Step starts at in-out.
- Old projects keep working. ease-in/out/in-out now read as Quad and
are still saved under that name. New curves save as cubic-out,
back-in-out and so on.
- Back and Elastic overshoot on purpose. A number property with min
or max is clamped in play and preview, so a Back in from scale 0
does not flip the sprite. trackWriteAt now takes the property
definition, and animatedKind* is renamed to animatedDef*.
- The timeline marker still shows only the direction.
- In-out is built for every curve from its in-curve and its mirror.
easings.net uses own constants for Back and Elastic in-out, so our
Back in-out winds up about 5 % instead of 10 %.
Tests:
- ./check.sh: 165 files, 2413 tests, CHECK EXIT 0.
- 12 new unit tests in tests/core/easing-curves.test.ts: round trip
of all 30 values, start/end/midpoint of every curve, reference
values, only Back and Elastic leave 0..1, clamping in play and
preview, unknown values are rejected.
- e2e 25: ALL PASSED, 28 checks. New 25b-ii (3 checks) clicks both
fields and undoes the four choices. Check sum 1393 -> 1396.
- Counter-checks, each fails its test: no clamping (2), Quad saved
as quad-* (2), mirrored in-out wrong (2), curve lookup with `in`
instead of Object.hasOwn (1), no Direction field (e2e 25).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
adminandClaude Opus 5.5
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