Akiba So 299b9546a8 feat(pen): apply pressure-response curve for natural feel ...

"手写笔就是一个带压感的手指，没有特殊适配" — correct. The new editor fed
RAW LINEAR stylus pressure into perfect_freehand, and the pressureGamma
config (a slider in pen-settings) was read ONLY by that slider's UI and
NEVER applied to a stroke. Dead wiring, like the rest.

Wire it for real:
- PenCanvas applies PressureCurve(floor, gamma) at capture, so stored
  pressure carries the feel and live + PDF export replay identically.
- Natural defaults: gamma 0.7 (light touches register more width, rnote/
  OneNote-like) + floor 0.12 (thin strokes keep body, not scratchy).
- pen_editor threads PenConfig.pressureGamma into the canvas — the slider
  now actually changes stroke width.
- pen_config: natural default + one-time migration of the legacy inert
  gamma 1.0, guarded by a marker so a deliberate 1.0 still sticks.

Tests: pen_config_gamma_migration (4) + pressure_curve (6) pass; pen
widget regressions green. flutter analyze: 0 issues.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-23 09:43:56 +08:00

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