46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
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// Map utility functions
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/**
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* Deep clone an object using JSON serialization
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*/
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export function clone<T>(obj: T): T {
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return JSON.parse(JSON.stringify(obj));
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}
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/**
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* Calculate the value at a given percentile in a sorted array
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* @param arr Sorted array of numbers
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* @param p Percentile (0-1)
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*/
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export function percentile(arr: number[], p: number): number {
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if (arr.length === 0) return 0;
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if (typeof p !== 'number') throw new TypeError('p must be a number');
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if (p <= 0) return arr[0];
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if (p >= 1) return arr[arr.length - 1];
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const index = arr.length * p;
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const lower = Math.floor(index);
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const upper = lower + 1;
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const weight = index % 1;
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if (upper >= arr.length) return arr[lower];
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return arr[lower] * (1 - weight) + arr[upper] * weight;
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}
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/**
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* Convert percentage-based color stops to value-based color stops
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* @param colorStopsPerc Array of [percentage, color] tuples
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* @param min Minimum value
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* @param max Maximum value
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*/
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export function calculateColorStops(
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colorStopsPerc: [number, string][],
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min: number,
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max: number
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): [number, string][] {
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return colorStopsPerc.map(([perc, color]) => [
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min + (perc * (max - min)) / 100,
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color,
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]);
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}
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