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24 lines
770 B
TypeScript
24 lines
770 B
TypeScript
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/**
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* Adds a random offset to a number within a certain percentage
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* @example
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* // Returns between 95-105
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* addOffset(100, 5);
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* @example
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* // Returns between 63-77
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* addOffSet(70, 10);
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* @param midpoint The number to be the midpoint of the offset range
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* @param percentage The percentage (in a range of 0-100) to offset
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*/
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export function addOffset(midpoint: number, percentage: number) {
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const maxPercent: number = 100;
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if (percentage < 0 || percentage > maxPercent) {
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return midpoint;
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}
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const offset: number = midpoint * (percentage / maxPercent);
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// Double the range to account for both sides of the midpoint.
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// tslint:disable-next-line:no-magic-numbers
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return midpoint + ((Math.random() * (offset * 2)) - offset);
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}
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