function vec2(a,b){
	this.a = a
	this.b = b
}
vec2.prototype.magnitude = function(){
	return this.b-this.a
}
vec2.prototype.length = function(){
	return abs(this.b-this.a)
}
vec2.prototype.dist = function(){
	return dist(0,this.a,0,this.b)
}
vec2.prototype.clone = function(){
	return new vec2(this.a, this.b)
}
vec2.prototype.abs = function(){
	if (this.b < this.a) {
		this.invert()
	}
	return this
}
vec2.prototype.invert = function(){
	this.a = this.a ^ this.b
	this.b = this.a ^ this.b
	this.a = this.a ^ this.b
	return this
}
vec2.prototype.midpoint = function(){
	return lerp(0.5, this.a, this.b)
}
vec2.prototype.eq = function(v){
	return this.a == v.a && this.b == v.b
}
vec2.prototype.add = function(n){
	this.a += n
	this.b += n
	return this
}
vec2.prototype.sub = function(n){
	this.a -= n
	this.b -= n
	return this
}
vec2.prototype.mul = function(n){
	this.a *= n
	this.b *= n
	return this
}
vec2.prototype.div = function(n){
	this.a /= n
	this.b /= n
	return this
}
vec2.prototype.setPosition = function(n){
	var len = this.length()
	this.a = n
	this.b = n + len
}
vec2.prototype.setLength = function(n){
	this.b = this.a + n
}
vec2.prototype.normalize = function(){
	var dim = max(this.a, this.b)
	this.a = this.a/dim
	this.b = this.b/dim
	return this
}
vec2.prototype.contains = function(n){
	return this.a <= n && n <= this.b
}
vec2.prototype.containsDisc = function(n,r){
	return this.a <= n-r && n+r <= this.b
}
vec2.prototype.clamp = function(n){
	return clamp(n, this.a, this.b)
}
vec2.prototype.clampDisc = function(n,r){
	return clamp(n, this.a+r, this.b-r)
}
vec2.prototype.intersects = function(v){
	if (this.a < v.a) {
		return (v.a < this.b && this.b <= v.b) || (this.a < v.b && v.b <= this.b)
	}
	else if (this.a == v.a) {
		return true
	}
	else if (this.a > v.a) {
		return (this.a < v.b && v.b <= this.b) || (v.a < this.b && this.b <= v.b)
	}
}
vec2.prototype.union = function(v){
	if (this.intersects(v)) {
	  return new vec2( min(this.a,v.a), max(this.b, v.b) )
	}
}
vec2.prototype.intersection = function(v){
	if (this.intersects(v)) {
	  return new vec2( max(this.a,v.a), min(this.b, v.b) )
	}
}
vec2.prototype.toString = function(){
	return "[" + ~~this.a + " " + ~~this.b + "]"
}
vec2.prototype.serialize = function(){
	return [ ~~this.a, ~~this.b ]
}
vec2.prototype.quantize = function(n){
	n = n || 10
	this.a = quantize(this.a, n)
	this.b = quantize(this.b, n)
}