@technobuddha/library/dist/angle-reflection.js

A large library of useful functions

import { normalizeAngle } from "./normalize-angle.js";
import { toAngle } from "./to-angle.js";
/**
 * Calculates the reflection of an angle across a specified axis.
 * @param angle - The angle to reflect.
 * @param axis - The axis across which to reflect the angle.
 * @param options - see {@link UnitOptions}
 * @returns The reflected angle, in the specified units.
 * @example
 * ```typescript
 * angleReflection(0, Math.PI / 2); // π
 * angleReflection((3 * Math.PI) / 2, Math.PI); // π/2
 * angleReflection(60, 30, 'degrees'); // 0
 * ```
 * @group Geometry
 * @category Angle
 */
export function angleReflection(angle, axis, { unit = 'radians' } = {}) {
    // Calculate the reflected angle
    const reflectedAngle = normalizeAngle(2 * normalizeAngle(axis, { unit }) - normalizeAngle(angle, { unit }));
    return toAngle(reflectedAngle, 'radians', unit);
}
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