feat(studio): curve, snap and type a value in an automation lane - #3038
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feat(studio): curve, snap and type a value in an automation lane#3038vanceingalls wants to merge 1 commit into
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Four gestures from Ableton's envelope editor, which is the muscle memory an automation lane inherits. Alt-drag the line between two breakpoints to bend it, Alt-double-click to straighten. `curve` was already honoured everywhere it is read — drawn in the lane, sampled in preview, baked into the render through setValueCurveAtTime — with no gesture anywhere that could set it, so every envelope anyone could draw was linear in practice. The curve is solved, not accumulated (x^e = f, so e = ln f / ln x), which keeps the segment under the pointer instead of drifting away over a long drag; the test asserts that by sampling with the renderer's own sampler. Shift locks a drag to one axis and fines the vertical travel to a quarter. Which axis won is decided in pixels — seconds and dB are not comparable numbers, and comparing them would make the lock depend on the zoom. A dragged point snaps to the beat grid and to its neighbouring points, with Alt to ignore it. The radius is tight on purpose: a lane is often a few seconds wide, where a generous radius makes a point unplaceable between two beats. Double-click a point to type its value. -6.0 dB is not a pixel you can find, and there was no way to enter one. The gesture layer moves to useAutomationLaneGestures and the path builder to envelopePath: the component was at the studio's 600-line ceiling, and both are worth testing without a render. trackShowsBeatStrip comes out of TimelineLanes for the same reason.
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