pdum_aiui

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aiui-pencil — one instrument, three surfaces.

A pencil whose range lives in your hand: pressure darkens and broadens it, laying it over turns the contact patch elliptical and it becomes charcoal. Textured strokes, a real eraser, and vanishing ink, on a raster surface that keeps stroke identity exactly as long as it needs to and not one frame longer.

Design, plan, and status: the aiui-pencil proposal and its plan, in git history. Supersedes the retired aiui-ink and aiui-paint (git history).

The core is layer 1: the pure stroke pipeline — everything from a PointerEvent to a list of dabs, with no DOM anywhere in it. Layered on top, and exported below: the renderer (PencilSurface, surface.ts), the remote wire and its endpoint cores (protocol.ts, remote.ts, the sessions); the command bus ships as its own channel (aiui-remote-bar).

The pipeline, end to end:

text
  PointerEvent → penSample()     normalize; derive whichever orientation pair
                                 the browser withheld           (telemetry.ts)
               → filterSamples() causal One-Euro low-pass          (filter.ts)
               → detectCusps()   the corners a spline must NOT
                                 smooth through                   (corners.ts)
               → densify()       centripetal Catmull-Rom, broken
                                 at those corners                  (spline.ts)
               → resample…()     onto the dab grid, by ARC LENGTH     (geom.ts)
               → dabAt()         pressure/tilt/azimuth/velocity
                                 → the stamp                        (dabs.ts)

planStroke runs all of it and keeps every intermediate stage, which is what the Lab draws — a tuning rig that can only show you the final stroke can tell you that it looks wrong, never where it went wrong.

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