Hi-Level/three-csg

import { Plane } from './Plane';
import { Vertex } from './Vertex';

/**
 * Represents a convex polygon. The vertices used to initialize a polygon must
 * be coplanar and form a convex loop. They do not have to be `Vertex`
 * instances but they must behave similarly (duck typing can be used for
 * customization).
 *
 * Each convex polygon has a `shared` property, which is shared between all
 * polygons that are clones of each other or were split from the same polygon.
 * This can be used to define per-polygon properties (such as surface color).
 */
export class Polygon {
  plane: Plane;

  constructor(public vertices: Vertex[], public shared: any) {
    this.plane = Plane.fromPoints(
      vertices[0].pos,
      vertices[1].pos,
      vertices[2].pos
    );
  }

  clone(): Polygon {
    return new Polygon(
      this.vertices.map((v) => v.clone()),
      this.shared
    );
  }

  flip(): void {
    this.vertices.reverse().map((v) => v.flip());
    this.plane.flip();
  }
}