HalfEdge.js

function HalfEdge(v, name){
	this.name = name;
	//this.Start = null;
	this.origin = v;
	//this.oppositeEdge = null;
	this.next = null; //counter clock wise
	this.prev = null;
	this.twin = null;
	this.helper = null;
    this.polygon = null;

}

HalfEdge.prototype.setNextEdge = function(he){
	this.next = he;
};

HalfEdge.prototype.setPrevEdge = function(pe){
	this.prev = pe;
};

HalfEdge.prototype.setTwin = function(e){
	this.twin = e;
};

HalfEdge.prototype.setHelper = function(p){
	this.helper = p;
};

HalfEdge.prototype.toHTML = function(){
    var pName = this.polygon ? this.polygon.getName() : '';
	return `<b>e${this.name}</b><br/>(${this.origin.getName()}, ${this.next.origin.getName()})<br/>${pName}`;
};

HalfEdge.prototype.getName = function(){
    return 'e'+this.name;
};
HalfEdge.prototype.setOrigin = function(v){
    this.origin = v;
};
HalfEdge.prototype.setPolygon = function(p){
    this.polygon = p;
};