plotboilerplate/src/ts/utils/createRandomizedPolygon.ts

A simple javascript plotting boilerplate for 2d stuff.

/**
 * A helper function to generate randmoized non-intersecting polygons.
 *
 * @author  Ikaros Kappler
 * @date    2025-03-23 (ported to Typescript from a helper script from 2024)
 * @version 1.0.0
 */

import { Bounds } from "../Bounds";
import { Polygon } from "../Polygon";
import { Vertex } from "../Vertex";

/**
 * @param numVertices
 * @returns
 */

export const createRandomizedPolygon = (numVertices: number, viewport: Bounds, createClockwise?: boolean) => {
  const polygon = new Polygon();
  for (var i = 0; i < numVertices; i++) {
    const vert = new Vertex(viewport.getMinDimension() * 0.33, 0.0);
    vert.rotate(((Math.PI * 2) / numVertices) * i);
    vert.addXY(viewport.width * 0.1 * (1.0 - Math.random() * 2), viewport.height * 0.1 * (1.0 - Math.random() * 2));
    polygon.addVertex(vert);
  }
  if (createClockwise && !polygon.isClockwise()) {
    // Reverse
    polygon.vertices = polygon.vertices.reverse();
  }
  return polygon;
};