Datum editor (step 3):
- Add world-axis role to rectangles (isAxisReference) and lines
(axisRole: "x"|"y"). Exclusive via a new store action that clears
any other axis flag on write. The solver's pickPrimary now honors an
explicit user flag ahead of the type-priority fallback; line-primary
correspondences target world +x or +y depending on the flag.
- Panel UI: checkbox on rect cards, three-way button row on line cards,
and an axis badge in each card header.
- Ellipse datum switches to 8 user-placed points on the circle contour.
New src/lib/ellipse-fit.ts does an algebraic LSQ conic fit (data-
normalised, 5x5 Gaussian solve, f=-1 constraint) and returns the
geometric center + perpendicular conjugate semi-axes, which we cache
on the datum for the solver and renderer. Dragging any handle
refits; an extra center handle translates all 8 points together.
datum-cache migrates legacy 3-handle storage by synthesising 8
samples from the old parametric form.
- ResultViewer auto-scale now floors to an int to match the integer-
only scale input (step=1).
Measurement tool (step 4) — CorrectedImageViewer.vue:
- Three measurement tools: line (length), ellipse (semi-axes + area),
angle (0-180 degrees between two rays).
- Persistent, multi-measurement state. Each has id, colorIndex, and
type-specific geometry; colors cycle via the existing getDatumColor
palette with a monotonic counter so deletion doesn't recolor.
- Selection model with hit-testing on handles, geometry, and labels.
Selected draws on top in white; others render dashed with 0.8/0.5
alpha so the active measurement pops.
- Dragging geometry or label moves the whole measurement; dragging a
handle reshapes just that handle. 3px mouse threshold distinguishes
click from drag.
- Side panel lists measurements with color chip, type, value, and a
delete button; clicking selects on canvas. Delete/Backspace deletes
the selected measurement. Escape cancels in-progress placement.
- Live placement preview + inline hint strip describes what the next
click does. Pinch-zoom and single-finger pan still work.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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