Danila KhodjaefandCursor
0ece1195fa
Timeline: era and historical-event click-to-zoom, event markers from historical-events.ts. Movement flow: shared zoom/pan, viewport-fit layout, curved lineage streams, hover-to-reveal artist lifespans on stacked lanes. Docs updated. Includes batch-fetched paintings and regenerated thumbs. Co-authored-by: Cursor <cursoragent@cursor.com>
52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
/** Shared timeline zoom/pan math for Timeline and MovementBands. */
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export function zoomTimelineView(
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clientX: number,
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rectLeft: number,
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rectWidth: number,
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deltaY: number,
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viewStart: number,
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viewEnd: number,
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absoluteMin: number,
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absoluteMax: number
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): { start: number; end: number } {
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const span = viewEnd - viewStart;
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const ratio = (clientX - rectLeft) / rectWidth;
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const centerYear = viewStart + ratio * span;
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const factor = deltaY > 0 ? 1.15 : 0.85;
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const newSpan = Math.max(10, Math.min(absoluteMax - absoluteMin, span * factor));
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let newStart = centerYear - ratio * newSpan;
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let newEnd = centerYear + (1 - ratio) * newSpan;
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if (newStart < absoluteMin) {
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newEnd += absoluteMin - newStart;
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newStart = absoluteMin;
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}
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if (newEnd > absoluteMax) {
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newStart -= newEnd - absoluteMax;
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newEnd = absoluteMax;
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}
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return { start: Math.round(newStart), end: Math.round(newEnd) };
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}
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export function panTimelineView(
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deltaX: number,
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rectWidth: number,
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viewStart: number,
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viewEnd: number,
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absoluteMin: number,
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absoluteMax: number
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): { start: number; end: number } {
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const span = viewEnd - viewStart;
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const yearDelta = (deltaX / rectWidth) * span;
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let newStart = viewStart - yearDelta;
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let newEnd = viewEnd - yearDelta;
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if (newStart < absoluteMin) {
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newEnd += absoluteMin - newStart;
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newStart = absoluteMin;
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}
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if (newEnd > absoluteMax) {
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newStart -= newEnd - absoluteMax;
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newEnd = absoluteMax;
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}
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return { start: Math.round(newStart), end: Math.round(newEnd) };
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}
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