Vector2d can be loaded through Require.js (AMD), CommonJS or using script tags.
Require.js
define(['vector2d'], function(Vector2d) { ... });Common js
var Vector2d = require('vector2d').Vector2d;Script tag
<script src="vector2d.js"></script>A new Vector2d instance can be instantiated with or without the new operator:
var v1 = new Vector2d();
var v2 = Vector2d();Initial vector values can also be passed to the constructor function as a list of x y values, or as an array:
var v1 = Vector2d(4, 5);
var v2 = Vector2d([1, 1]);The vectors can now be manipulated and queried using method calls.
v1.subtract(v2);
// v1 == [3, 4]
// v2 == [1, 1]Meaning, the calling vector gets set to the resultant of the operation.
Using .clone() makes a copy of the vector to ensure operations are non-destructive.
var result = v1.clone().subtract(v2);
// result == [3, 4]
// v1 == [4, 5]
// v2 == [1, 1]All methods which accept a vector parameter can also accept a 2 value array instead.
v1.add([3, 3]);
v1.multiply([2, 2]);Methods which return a vector can be chained together.
v1.add(v2).scale(2).rotate(0.5);