149 lines
3.1 KiB
TypeScript
149 lines
3.1 KiB
TypeScript
import { create } from "domain";
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export class Vertex {
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coords: [number, number];
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incident_edge: HalfEdge;
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constructor(x: number, y: number) {
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this.coords = [x, y];
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}
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get_all(): HalfEdge[] {
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const out = [];
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let current = this.incident_edge;
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do {
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out.push(current);
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current = current.twin.next;
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} while (current != this.incident_edge);
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return out;
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}
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}
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export class Face {
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attributes: any;
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outer_component: HalfEdge;
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inner_components: HalfEdge[];
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constructor(attributes?: any) {
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this.attributes = attributes;
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}
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loop(): [number, number][] {
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const out = [];
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let iter = 0;
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let current = this.outer_component;
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do {
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if (iter > 100) {
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throw new Error("Fuck off");
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}
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iter += 1;
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console.log(current.id, current.face.attributes, current.origin.coords);
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out.push(current.origin.coords);
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current = current.next;
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} while (current != this.outer_component);
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return out;
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}
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}
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var id = 0;
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function next_id(): number {
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id += 1;
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return id;
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}
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export class HalfEdge {
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origin: Vertex;
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// destination = twin.origin
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next: HalfEdge;
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prev: HalfEdge;
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twin: HalfEdge;
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face: Face;
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id: number;
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constructor(origin: Vertex, f1: Face, f2?: Face) {
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this.id = next_id();
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this.origin = origin;
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this.next = this;
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this.prev = this;
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if (f2) {
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this.twin = new HalfEdge(origin, f2);
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} else {
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this.twin = this;
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}
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this.face = f1;
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}
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insert(at: Vertex, update_twin = true): HalfEdge {
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const new_edge = new HalfEdge(at, this.face);
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new_edge.next = this.next;
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new_edge.prev = this;
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new_edge.twin = this.twin;
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this.next.prev = new_edge;
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this.next = new_edge;
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if (update_twin) {
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this.twin = this.twin.insert(at, false);
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}
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return new_edge;
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}
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split(to: Vertex) {
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const e_to = new HalfEdge(this.origin, this.face);
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const e_from = new HalfEdge(to, this.face);
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e_to.twin = e_from;
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e_from.twin = e_to;
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e_to.prev = this.prev;
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e_to.next = e_from;
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e_from.next = this;
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e_from.prev = e_to;
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this.prev.next = e_to;
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this.prev = e_from;
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}
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add_face() {
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}
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to_string(): string {
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return `Halfedge from ${this.origin ? this.origin.coords : undefined} face1 ${this.face ? this.face.attributes : undefined}`;
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}
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}
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export function test() {
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const f1 = new Face("Face 1");
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const f2 = new Face("Face 2");
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const v1 = new Vertex(0, 0);
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const v2 = new Vertex(1, 1);
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const v3 = new Vertex(-1, 0);
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const v4 = new Vertex(2, 0);
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const e1 = new HalfEdge(v1, f1, f2);
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f1.outer_component = e1;
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const e2 = e1.insert(v2);
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const e3 = e2.split(v3);
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const e4 = e2.insert(v4);
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e1.twin.next = e4.twin;
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f2.outer_component = e4.twin;
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// const e3 = e1.insert(v3);
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console.log(f1.loop());
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console.log(f2.loop());
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}
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