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