https://www.etheria.world/lib/point.js

1function Point(x, y){
2	this.x = x || 0;
3	this.y = y || 0;
4};
5Point.prototype.x = null;
6Point.prototype.y = null;
7Point.prototype.add = function(v){
8	return new Point(this.x + v.x, this.y + v.y);
9};
10Point.prototype.clone = function(){
11	return new Point(this.x, this.y);
12};
13Point.prototype.degreesTo = function(v){
14	var dx = this.x - v.x;
15	var dy = this.y - v.y;
16	var angle = Math.atan2(dy, dx); // radians
17	return angle * (180 / Math.PI); // degrees
18};
19Point.prototype.distance = function(v){
20	var x = this.x - v.x;
21	var y = this.y - v.y;
22	return Math.sqrt(x * x + y * y);
23};
24Point.prototype.equals = function(toCompare){
25	return this.x == toCompare.x && this.y == toCompare.y;
26};
27Point.prototype.interpolate = function(v, f){
28	return new Point( v.x + (this.x - v.x) * f, v.y + (this.y - v.y) * f );
29};
30Point.prototype.length = function(){
31	return Math.sqrt(this.x * this.x + this.y * this.y);
32};
33Point.prototype.normalize = function(thickness){
34	var l = this.length();
35	this.x = this.x / l * thickness;
36	this.y = this.y / l * thickness;
37};
38Point.prototype.orbit = function(origin, arcWidth, arcHeight, degrees){
39	var radians = degrees * (Math.PI / 180);
40	this.x = origin.x + arcWidth * Math.cos(radians);
41	this.y = origin.y + arcHeight * Math.sin(radians);
42};
43Point.prototype.offset = function(dx, dy){
44	this.x += dx;
45	this.y += dy;
46};
47Point.prototype.subtract = function(v){
48	return new Point(this.x - v.x, this.y - v.y);
49};
50Point.prototype.toString = function(){
51	return "(x=" + this.x + ", y=" + this.y + ")";
52};
53 
54Point.interpolate = function(pt1, pt2, f){
55	return pt1.interpolate(pt2, f);
56};
57Point.polar = function(len, angle){
58	return new Point(len * Math.cos(angle), len * Math.sin(angle));
59};
60Point.distance = function(pt1, pt2){
61	var x = pt1.x - pt2.x;
62	var y = pt1.y - pt2.y;
63	return Math.sqrt(x * x + y * y);
64};