67 lines
1.5 KiB
TypeScript
67 lines
1.5 KiB
TypeScript
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import Fraction from "fraction.js";
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const beats = [
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new Fraction(1).div(4),
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new Fraction(1).div(6),
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new Fraction(1).div(8),
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new Fraction(1).div(12),
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new Fraction(1).div(16),
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];
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function determineBeat(offset: Fraction): Arrow["beat"] {
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const match = beats.find((b) => offset.mod(b).n === 0);
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if (!match) {
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// didn't find anything? then it's a weirdo like a 5th note or 32nd note, they get colored
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// the same as 6ths
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return 6;
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}
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return match.d as Arrow["beat"];
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}
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const normalizedDifficultyMap: Record<string, Difficulty> = {
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beginner: "beginner",
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easy: "basic",
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basic: "basic",
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trick: "difficult",
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another: "difficult",
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medium: "difficult",
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difficult: "expert",
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expert: "expert",
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maniac: "expert",
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ssr: "expert",
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hard: "expert",
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challenge: "challenge",
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smaniac: "challenge",
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// TODO: filter edits out altogether
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edit: "edit",
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};
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function similarBpm(a: Bpm, b: Bpm): boolean {
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return Math.abs(a.bpm - b.bpm) < 1;
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}
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function mergeSimilarBpmRanges(bpm: Bpm[]): Bpm[] {
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return bpm.reduce<Bpm[]>((building, b, i, a) => {
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const prev = a[i - 1];
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const next = a[i + 1];
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if (prev && similarBpm(prev, b)) {
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// this bpm was merged on the last iteration, so skip it
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return building;
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}
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if (next && similarBpm(next, b)) {
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return building.concat({
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...b,
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endOffset: next.endOffset,
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});
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}
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return building.concat(b);
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}, []);
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}
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export { determineBeat, normalizedDifficultyMap, mergeSimilarBpmRanges };
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