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fix(photos): length dim parallel to approved axis (#70)

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grokbot_ty
2026-09-16 04:35:53 +00:00
parent dc19cffcc0
commit 6d182db81b
1 changed files with 6 additions and 23 deletions
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frontend/src/png/overlay.ts
+6 -23
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@@ -237,29 +237,12 @@ export function buildOverlayPlan(input: OverlayPlanInput): OverlayPlan {
if (extent && extent.maxP > maxRight) maxRight = extent.maxP;
}
const outward = maxRight + pad;
// Tip pixels = wood ends. Translate them by a single screen-axis offset so the
// dim line stays || tip-to-tip (measured span = wood tip-to-tip) and arrowheads
// share tip y (vertical-ish) / tip x (horizontal-ish) — no past-footprint
// overshoot from (rx,ry)*outward (#69). Clearance magnitude matches classic
// axis-right mid (centerline + r*outward).
const tipOriented = pickBottomTowardTop(seg.tipStart, seg.tipEnd);
const aClassic: [number, number] = [bottom[0] + rx * outward, bottom[1] + ry * outward];
const bClassic: [number, number] = [top[0] + rx * outward, top[1] + ry * outward];
const tipMidX = (tipOriented.bottom[0] + tipOriented.top[0]) / 2;
const tipMidY = (tipOriented.bottom[1] + tipOriented.top[1]) / 2;
const classicMidX = (aClassic[0] + bClassic[0]) / 2;
const classicMidY = (aClassic[1] + bClassic[1]) / 2;
let aSrc: [number, number];
let bSrc: [number, number];
if (Math.abs(uy) >= Math.abs(ux)) {
const dx = classicMidX - tipMidX;
aSrc = [tipOriented.bottom[0] + dx, tipOriented.bottom[1]];
bSrc = [tipOriented.top[0] + dx, tipOriented.top[1]];
} else {
const dy = classicMidY - tipMidY;
aSrc = [tipOriented.bottom[0], tipOriented.bottom[1] + dy];
bSrc = [tipOriented.top[0], tipOriented.top[1] + dy];
}
// Classic dimensioning (#70): centerline tip stations (robust 0.2%/99.8% axial
// percentiles from maskAxisSegment — keeps #69 speck immunity) offset by pure
// axis-right (rx,ry)*outward. Length stays || approved (ux,uy); no screen-only
// tip translation (that made a→b follow tip-to-tip ≠ axis on irregular wood).
const aSrc: [number, number] = [bottom[0] + rx * outward, bottom[1] + ry * outward];
const bSrc: [number, number] = [top[0] + rx * outward, top[1] + ry * outward];
const midSrc: [number, number] = [(aSrc[0] + bSrc[0]) / 2, (aSrc[1] + bSrc[1]) / 2];
// Nudge label further outward a bit (axis-right of dim line)
const labelSrc: [number, number] = [midSrc[0] + rx * (scale * 0.4), midSrc[1] + ry * (scale * 0.4)];