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keys.easePreset.apply {preset | curve} eases every pair of neighbouring
selected keyframes of each selected property in one undo step: the out
side of the earlier key and the in side of the later one. A curve is
given as {outInfluence, outSpeed, inInfluence, inSpeed} or as handles
[x1, y1, x2, y2]. keys.easePreset.capture reads the curve between the
first selected pair; keys.easePreset.save {name, curve?} keeps it (or a
given curve), and list, rename and delete manage the user presets.
Twelve built-in curves are our own numbers (Linear, Smooth, Ease In-Out
Soft / plain / Strong, Accelerate and Decelerate with Strong variants,
Expo In-Out / Accelerate / Decelerate) and can't be renamed, deleted or
overwritten. User presets live in the config store (ease_presets.json),
loaded with the other settings. A file that isn't JSON gives no user
presets, and entries that don't parse, have no usable name or repeat a
name are skipped and logged. A failed write leaves the presets as they
were.
Test: a_preset_eases_every_selected_pair_in_one_undo_step,
a_curve_scales_to_each_dimension_and_follows_motion_paths,
apply_needs_neighbouring_keys_and_a_known_curve,
user_presets_save_rename_delete_and_persist,
a_corrupt_presets_file_loads_what_it_can (effectcraft-engine).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>