16 lines
543 B
TypeScript
16 lines
543 B
TypeScript
import { PointerCoords } from "./types";
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export const getCenter = (pointers: Map<number, PointerCoords>) => {
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const allCoords = Array.from(pointers.values());
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return {
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x: sum(allCoords, (coords) => coords.x) / allCoords.length,
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y: sum(allCoords, (coords) => coords.y) / allCoords.length,
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};
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};
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export const getDistance = ([a, b]: readonly PointerCoords[]) =>
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Math.hypot(a.x - b.x, a.y - b.y);
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const sum = <T>(array: readonly T[], mapper: (item: T) => number): number =>
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array.reduce((acc, item) => acc + mapper(item), 0);
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