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feat(stammbaum): raise MAX_ZOOM 3→10 so phones can zoom in to read (#692)

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Zoom is normalised to the whole tree, so z=3 still renders a wide tree too
small on a phone. Raise the ceiling to 10 (revises OQ-001); SVG stays crisp at
any zoom so a generous max is harmless.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-29 18:58:38 +02:00
parent b170085311
commit 8f836dfefb
2 changed files with 10 additions and 5 deletions
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6
frontend/src/lib/person/genealogy/panZoom.test.ts
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@@ -31,13 +31,13 @@ describe('clampZoom', () => {
});
it('clamps above MAX_ZOOM down to MAX_ZOOM', () => {
expect(clampZoom(5)).toBe(MAX_ZOOM);
expect(clampZoom(3.0001)).toBe(MAX_ZOOM);
expect(clampZoom(99)).toBe(MAX_ZOOM);
expect(clampZoom(MAX_ZOOM + 0.0001)).toBe(MAX_ZOOM);
});
it('exposes the resolved zoom bounds', () => {
expect(MIN_ZOOM).toBe(0.25);
expect(MAX_ZOOM).toBe(3.0);
expect(MAX_ZOOM).toBe(10);
});
});

9
frontend/src/lib/person/genealogy/panZoom.ts
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@@ -9,9 +9,14 @@
* project. See ADR-027 for why this is custom rather than a third-party library.
*/
/** Resolved zoom bounds (OQ-001). */
/**
* Zoom bounds. OQ-001 originally resolved the ceiling to 3.0, but because zoom
* is normalised to the whole tree, z=3 still shows too much of a wide tree to be
* legible on a phone — so the ceiling was raised to 10 (product-owner revision,
* #692). SVG stays vector-crisp at any zoom, so a generous max is harmless.
*/
export const MIN_ZOOM = 0.25;
export const MAX_ZOOM = 3.0;
export const MAX_ZOOM = 10;
export const DEFAULT_ZOOM = 1;
/** Minimum zoom a recentre will snap up to so the focal node's text is legible (OQ-005). */