26 lines
1.2 KiB
TypeScript
26 lines
1.2 KiB
TypeScript
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export interface SnapPoint { ms: number; label: string }
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/** Keep magnetic selection consistent with zoom without attracting distant audio. */
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export function snapTimelineTime(ms: number, points: SnapPoint[], duration: number, width: number, bypass = false) {
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const bounded = Math.round(Math.max(0, Math.min(duration, ms)));
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const radius = Math.min(500, duration / Math.max(1, width) * 8);
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let point: SnapPoint | null = null;
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let distance = radius;
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if (!bypass) {
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for (const candidate of points) {
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if (candidate.ms < 0 || candidate.ms > duration) continue;
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const delta = Math.abs(candidate.ms - bounded);
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if (delta <= distance && (!point || delta < distance)) { point = candidate; distance = delta; }
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}
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}
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return { ms: point?.ms ?? bounded, point };
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}
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/** A resized segment must stay in the recording and retain a positive duration. */
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export function resizeTranscriptRange(start: number, end: number, edge: "start" | "end", ms: number, duration: number) {
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const value = Math.round(ms);
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return edge === "start"
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? { start_ms: Math.max(0, Math.min(end - 1, value)), end_ms: end }
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: { start_ms: start, end_ms: Math.max(start + 1, Math.min(duration, value)) };
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}
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