51 lines
1.6 KiB
TypeScript
51 lines
1.6 KiB
TypeScript
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import convert from "convert";
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import { Length } from "convert";
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export type length_t = {
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l: number; u: Length;
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};
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export type area_t = length_t & {
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w: number;
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};
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export type dimensions_t = area_t | length_t;
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export const isArea = (d: dimensions_t) => ("width" in d);
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export const isLength = (d: dimensions_t) => (!("width" in d));
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export const dimensionType = (d: dimensions_t) => isArea(d) ? "area" : "length"; export function matchDimensions(d1: dimensions_t, d2: dimensions_t) {
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if (!(
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(isArea(d1) && isArea(d2)) ||
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(isLength(d1) && isLength(d2))
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)) {
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throw new Error(`Dimension mismatch: ${JSON.stringify(d1)} / ${JSON.stringify(d1)}`);
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}
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return {
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l: convert(d1.l, d1.u).to(d2.u),
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u: d2.u,
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...(
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"w" in d1 ?
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{ w: convert(d1.w, d1.u).to(d2.u), }
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: {}
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)
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};
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}
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/**
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* Gets the total length of a carpet roll based on a diameter
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* @param outerDiameter Outer diameter of the carpet roll
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* @param innerDiameter Inner diameter of the carpet roll (the "hole")
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* @param numRings Number of "rings" or "layers,"" just like a tree 🙂 🌲
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*/
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export function diameterToLength(outerDiameter: length_t, innerDiameter: length_t, numRings: number) {
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if (outerDiameter.u !== innerDiameter.u) {
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throw new Error("diameter units must match!")
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}
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const thickness = (((outerDiameter.l - innerDiameter.l) / 2) / numRings);
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return {
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l: Math.PI * (Math.pow(outerDiameter.l, 2) / 4) - (Math.pow(innerDiameter.l, 2) / 4) / thickness,
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u: innerDiameter.u,
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};
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}
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