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@Deftwun
Created July 6, 2016 05:25
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//2d Vector class (based on Vector.js)
var Vector = function(x,y){ this.x = x || 0; this.y = y || 0; };
Vector.prototype={
rot: function(a) {
var theta = a * Math.PI/180,
cs = Math.cos(theta),
sn = Math.sin(theta),
px = this.x * cs - this.y * sn;
py = this.x * sn + this.y * cs;
this.x = px;
this.y = py;
return this;
},
add: function(x,y) { return new Vector(this.x + x, this.y + y); },
sub: function(x,y) { return new Vector(this.x - x, this.y - y) },
mul: function(x,y) { return new Vector(this.x * x, this.y * y) },
neg: function() { return new Vector(-this.x, -this.y);},
angle: function() { return this.y / this.length();},
clone: function() { return new Vector(this.x,this.y);},
dot: function(v) { return this.x * v.x + this.y * v.y; },
len: function() { return Math.sqrt(this.dot(this)) },
unit: function() { return this.mul(1 / this.len()) },
angleTo: function(v) { return Math.acos(this.dot(a) / (this.length() * a.length())); }
};
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