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fix(photos): length dim snaps to wood footprint (#69)

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grokbot_ty
2026-09-16 02:18:09 +00:00
parent 415158d4d3
commit 05447c92fc
2 changed files with 111 additions and 27 deletions
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frontend/src/png/overlay.ts
+75 -11
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@@ -83,7 +83,16 @@ function maskAxisSegment(
w: number,
h: number,
bbox: BBox,
): { start: [number, number]; end: [number, number]; ux: number; uy: number; span: number } {
): {
start: [number, number];
end: [number, number];
/** Actual mask pixels achieving min/max axial projection (wood tips). */
tipStart: [number, number];
tipEnd: [number, number];
ux: number;
uy: number;
span: number;
} {
const { start: a, end: b } = axisEndpoints(bbox);
const ex = b[0] - a[0];
const ey = b[1] - a[1];
@@ -93,21 +102,50 @@ function maskAxisSegment(
const cx = (bbox.corners[0][0] + bbox.corners[1][0] + bbox.corners[2][0] + bbox.corners[3][0]) / 4;
const cy = (bbox.corners[0][1] + bbox.corners[1][1] + bbox.corners[2][1] + bbox.corners[3][1]) / 4;
const cProj = cx * ux + cy * uy;
let minP = Infinity;
let maxP = -Infinity;
// Collect axial projections; absolute min/max tip pixels can be mask specks
// past the visible wood footprint (Ty UAT #69). Use robust percentiles and
// pick tip pixels near the centerline at those stations.
const projs: number[] = [];
for (let y = 0; y < h; y++) {
const row = y * w;
for (let x = 0; x < w; x++) {
if (!bitset[row + x]) continue;
projs.push(x * ux + y * uy);
}
}
if (projs.length === 0) return { start: a, end: b, tipStart: a, tipEnd: b, ux, uy, span: 0 };
projs.sort((p, q) => p - q);
const lo = Math.min(Math.floor(projs.length * 0.002), projs.length - 1);
const hi = Math.max(Math.floor(projs.length * 0.998), lo);
const minP = projs[lo];
const maxP = projs[hi];
// Tip pixel at each robust station: closest to the axis centerline
let tipStart: [number, number] = a;
let tipEnd: [number, number] = b;
let bestStart = Infinity;
let bestEnd = Infinity;
const stationTol = Math.max(1.5, (maxP - minP) * 0.001);
for (let y = 0; y < h; y++) {
const row = y * w;
for (let x = 0; x < w; x++) {
if (!bitset[row + x]) continue;
const p = x * ux + y * uy;
if (p < minP) minP = p;
if (p > maxP) maxP = p;
const across = Math.abs((x - cx) * -uy + (y - cy) * ux); // |(p - c) cross u| via r
if (Math.abs(p - minP) <= stationTol && across < bestStart) {
bestStart = across;
tipStart = [x, y];
}
if (Math.abs(p - maxP) <= stationTol && across < bestEnd) {
bestEnd = across;
tipEnd = [x, y];
}
}
}
if (maxP < minP) return { start: a, end: b, ux, uy, span: 0 };
return {
start: [cx + ux * (minP - cProj), cy + uy * (minP - cProj)],
end: [cx + ux * (maxP - cProj), cy + uy * (maxP - cProj)],
tipStart,
tipEnd,
ux,
uy,
span: maxP - minP,
@@ -174,7 +212,8 @@ export function buildOverlayPlan(input: OverlayPlanInput): OverlayPlan {
const leftSrc: [number, number] = [ox + rx * extent.minP, oy + ry * extent.minP];
const rightSrc: [number, number] = [ox + rx * extent.maxP, oy + ry * extent.maxP];
// Width number sits axis-left outside the slab (past left tip).
const labelOff = extent.minP - pad - scale * 0.4;
// Extra clearance so glyph box (textAlign grows away from wood) stays off footprint.
const labelOff = extent.minP - pad - scale * 0.4 - Math.max(22, Math.round(scale * 1.0)) * 0.35;
const labelSrcW: [number, number] = [ox + rx * labelOff, oy + ry * labelOff];
const widthIn = (extent.maxP - extent.minP + 1) / scale;
widths.push({
@@ -198,10 +237,31 @@ export function buildOverlayPlan(input: OverlayPlanInput): OverlayPlan {
if (extent && extent.maxP > maxRight) maxRight = extent.maxP;
}
const outward = maxRight + pad;
const aSrc: [number, number] = [bottom[0] + rx * outward, bottom[1] + ry * outward];
const bSrc: [number, number] = [top[0] + rx * outward, top[1] + ry * outward];
// 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];
}
const midSrc: [number, number] = [(aSrc[0] + bSrc[0]) / 2, (aSrc[1] + bSrc[1]) / 2];
// Nudge label further outward a bit
// 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)];
const fontPx = Math.max(22, Math.round(scale * 1.0));
@@ -264,11 +324,15 @@ export function drawOverlayPlan(
// Length
arrow(plan.length.a, plan.length.b);
ctx.textAlign = 'center';
ctx.fillText(plan.length.label, plan.length.labelAt[0], plan.length.labelAt[1]);
// Widths
// Widths — grow text away from wood (labelAt is axis-left of left tip)
for (const w of plan.widths) {
arrow(w.left, w.right);
// labelAt is on the axis-left side of the station; align so glyphs extend further out
const towardLeft = w.labelAt[0] <= w.center[0];
ctx.textAlign = towardLeft ? 'right' : 'left';
ctx.fillText(w.label, w.labelAt[0], w.labelAt[1]);
}