New module math_assist.rs: when the last two strokes form an = and the pen
rests for 500 ms, the strokes left of it (in a band around the =, up to a
wide gap) are recognized and computed. The suggestion appears next to
the = and shows what was read, e.g. "2⁴ = 16"; tapping it with the pen
or clicking inserts the result as a text box in the ink color and as high
as the handwriting, as one undo step. The chip is not interactive for
egui, so fingers and palms pass through. Any new stroke drops it. In a
chain like x = 2 · 3 = the part after the previous = is computed.
Off by default: ☰ → Input → "Compute formulas after =", saved in
ui.json. math::display writes the recognized expression neatly.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
New module math_ink.rs turns the strokes of an expression into text for
math::solve. Consecutive overlapping strokes are grouped into symbols,
each symbol is classified with the $P point-cloud recognizer (plus the
turning angle and a small stroke-count penalty) against built-in
templates for digits, + ( ) / x y a b, and the structure comes from the
positions: stacked lines are =, stacked dots :, lines with symbols above
and below are fraction bars, low dots between digits decimal commas and
raised symbols exponents. Own templates can be added for stage 4.
Tested with synthetic handwriting (slanted, rotated, warped); not used by
the UI yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
haraldandClaude Opus 5.5