@technobuddha/library/dist/rotate.js

A large library of useful functions

import { normalizeAngle } from "./normalize-angle.js";
/**
 * Rotates a point around a given origin by a specified angle.
 * @param point - The Cartesian coordinates of the point to rotate.
 * @param angle - The angle in radians to rotate the point. Positive values rotate counterclockwise.
 * @param origin - The Cartesian coordinates of the origin around which to rotate.
 * @returns The new Cartesian coordinates of the rotated point.
 * @internal
 */
function rotatePoint(point, angle, origin) {
    return {
        x: (point.x - origin.x) * Math.cos(angle) - (point.y - origin.y) * Math.sin(angle) + origin.x,
        y: (point.x - origin.x) * Math.sin(angle) + (point.y - origin.y) * Math.cos(angle) + origin.y,
    };
}
/**
 * Rotates a point or a polygon around a given origin by a specified angle.
 * @group Geometry
 * @category Point
 * @category Polygon
 */ export function rotate(point, angle, { origin = { x: 0, y: 0 }, unit = 'radians' } = {}) {
    const angleInRadians = normalizeAngle(angle, { unit });
    if (Array.isArray(point)) {
        return point.map((p) => rotatePoint(p, angleInRadians, origin));
    }
    return rotatePoint(point, angleInRadians, origin);
}
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