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comp-spec snaps text and control regions to the largest ink mass in their grid span

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A session's own note said its hero sat at 67 because the 10x10 grid boxes straddled two elements each, and it was right: every downstream measurement (cap height, line count, structure) inherited the slop. Text and control regions now snap to the dominant connected ink inside the span (page-ground threshold, dilated cells, masses touching the span's sides lose to inside masses), keep the span on the record for coverage, and can opt out with snap: false.

AI-assisted (Claude Code).
This commit is contained in:
Paul Bakaus
2026-08-28 06:13:59 +05:00
committed by Abdul Wahab
parent 36e6864d56
commit 7cea970c6c
3 changed files with 105 additions and 3 deletions
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tests/build-phase.test.mjs
+17
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@@ -74,6 +74,23 @@ describe('comp-spec', () => {
assert.equal(plate.regions[0].medium, 'raster');
});
it('snaps a text region to the largest ink mass in its grid span, keeping the span for coverage', () => {
// headline block at left, a thin dark spine on the span's left edge, a
// column of small text at its right: the span B1:E4 covers all three
const comp = createImage(1000, 1000, [235, 232, 220, 255]);
fillRect(comp, 100, 0, 12, 1000, [160, 40, 30, 255]);
drawText(comp, 'KEEP OLD', 160, 130, [20, 20, 20, 255], 8);
drawText(comp, 'IRON', 160, 220, [20, 20, 20, 255], 8);
for (let i = 0; i < 6; i++) drawText(comp, 'small column text', 430, 120 + i * 30, [20, 20, 20, 255], 2);
const spec = measureRegions(comp, { allowUncovered: true, regions: [{ id: 'headline', kind: 'text', grid: 'B1:E4', note: 'two-line block headline' }] }, 'c.png');
const r = spec.regions[0];
assert.equal(r.grid, 'B1:E4');
assert.ok(r.coverBox && r.coverBox.w === 0.4, 'the span stays on the record');
assert.ok(r.box.w < 0.3 && r.box.x >= 0.14 && r.box.x + r.box.w <= 0.42, `snapped to the headline: ${JSON.stringify(r.box)}`);
const plain = measureRegions(comp, { allowUncovered: true, regions: [{ id: 'headline', kind: 'text', grid: 'B1:E4', note: 'two-line block headline', snap: false }] }, 'c.png');
assert.equal(plain.regions[0].box.w, 0.4);
});
it('warns when a plate box cuts through its own artwork', () => {
// a black arch on paper, drawn wider than the region that names it
const comp = createImage(1000, 1000, [235, 232, 220, 255]);