@technobuddha/library/src/polygon-sides.ts

A large library of useful functions

import { type LineSegment, type Polygon } from './@types/geometry.ts';
import { modulo } from './modulo.ts';
import { toLineSegment } from './to-line-segment.ts';

/**
 * Generate line segments for each side of the polygon.
 * @param polygon - The polygon to extract sides from
 * @returns Generator that yields line segments for each edge
 * @group Geometry
 * @category Polygon
 * @category Line Segment
 */
export function* polygonSides(polygon: Polygon): Generator<LineSegment> {
  for (let i = 0; i < polygon.length; i++) {
    const p1 = polygon[i];
    const p2 = polygon[modulo(i + 1, polygon.length)];
    yield toLineSegment(p1, p2);
  }
}