48 lines
1.3 KiB
TypeScript
48 lines
1.3 KiB
TypeScript
import type {
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Degrees,
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GlobalPoint,
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LocalPoint,
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PolarCoords,
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Radians,
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} from "./types";
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import { PRECISION } from "./utils";
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// TODO: Simplify with modulo and fix for angles beyond 4*Math.PI and - 4*Math.PI
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export const normalizeRadians = (angle: Radians): Radians => {
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if (angle < 0) {
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return (angle + 2 * Math.PI) as Radians;
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}
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if (angle >= 2 * Math.PI) {
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return (angle - 2 * Math.PI) as Radians;
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}
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return angle;
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};
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/**
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* Return the polar coordinates for the given cartesian point represented by
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* (x, y) for the center point 0,0 where the first number returned is the radius,
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* the second is the angle in radians.
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*/
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export const cartesian2Polar = <P extends GlobalPoint | LocalPoint>([
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x,
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y,
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]: P): PolarCoords => [Math.hypot(x, y), Math.atan2(y, x)];
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export function degreesToRadians(degrees: Degrees): Radians {
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return ((degrees * Math.PI) / 180) as Radians;
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}
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export function radiansToDegrees(degrees: Radians): Degrees {
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return ((degrees * 180) / Math.PI) as Degrees;
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}
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/**
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* Determines if the provided angle is a right angle.
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*
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* @param rads The angle to measure
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* @returns TRUE if the provided angle is a right angle
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*/
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export function isRightAngleRads(rads: Radians): boolean {
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return Math.abs(Math.sin(2 * rads)) < PRECISION;
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}
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