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Classify a star for the rows that list it, not every star each time the index is built

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The search index and the route index gave every one of the 455 571 stars a subtitle up front
through spectralClassification, which filtered the dwarf table afresh on each call; the star
field's tints read the same table once per BP−RP star. Both indices now carry the star itself
and classify it only for the rows shown (entrySubtitle): eight search results, a few route
options. The two filtered columns of the table are built once.

Node, over the shipped catalogue, five runs: classifying every star 121-167 ms before, 56-62
after hoisting the table alone; reading the sequence at every BP−RP colour 187-216 ms, now
111-127. In the app on :4302, two cold loads each, the long task when the Search tab opens was
264-380 ms (median 280) before and 164-276 ms (median 171) after; the longest boot task 863 and
875 ms before, 654 and 741 after.

Tests: the search spec checks its index holds no classification and the row still reads
"Star · ~M8"; the scene spec now reads the route options, and checks its index holds none either.
Controls: classifying every star in the search index, doing so in the route index, and route
options printing the index's subtitle each fail the named test.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Senrokai
2026-09-29 23:30:53 +02:00
co-authored by Claude Opus 5.5
parent ff744a00de
commit 18faa6d0b2
6 changed files with 46 additions and 12 deletions
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src/app/shared/astro/spectral.ts
+9 -2
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@@ -158,6 +158,13 @@ const DWARF_SEQUENCE: readonly (readonly [string, number, number | null, number,
['M8.5', 2.16, 5.1, 2420, -5.78, -3.09]
];
/**
* The rows each colour is tabulated for, filtered once. Filtered on every call, the search index
* and the star field's tints, which read the table for each of the 455 571 stars, spent 140-230
* ms of the main thread on it at boot, and the search index again on each opening of its tab.
*/
const ROWS_WITH_COLOUR = { 1: DWARF_SEQUENCE.filter((row) => row[1] !== null), 2: DWARF_SEQUENCE.filter((row) => row[2] !== null) } as const;
/**
* The spectral type of the dwarf whose colour is nearest, for the stars no catalogue classified —
* every Gaia star, 83 % of the map. An estimate, and the caller must say so: it assumes a dwarf,
@@ -167,7 +174,7 @@ const DWARF_SEQUENCE: readonly (readonly [string, number, number | null, number,
*/
export function spectralTypeFromColor(colorIndex: number | null, system: 'B-V' | 'BP-RP' = 'B-V'): string | null {
const column = system === 'B-V' ? 1 : 2;
const rows = DWARF_SEQUENCE.filter((row) => row[column] !== null);
const rows = ROWS_WITH_COLOUR[column];
if (colorIndex === null || !(colorIndex >= rows[0][column]! && colorIndex <= rows[rows.length - 1][column]!)) {
return null;
}
@@ -213,7 +220,7 @@ export interface DwarfSequencePoint {
*/
export function dwarfSequenceAtColor(colorIndex: number | null, system: 'B-V' | 'BP-RP' = 'B-V', clampToTable = false): DwarfSequencePoint | null {
const column = system === 'B-V' ? 1 : 2;
const rows = DWARF_SEQUENCE.filter((row) => row[column] !== null);
const rows = ROWS_WITH_COLOUR[column];
const [bluest, reddest] = [rows[0][column]!, rows[rows.length - 1][column]!];
if (colorIndex === null || !Number.isFinite(colorIndex) || (!clampToTable && !(colorIndex >= bluest && colorIndex <= reddest))) {
return null;