var Class = require('../utils/Class'); 
var Vector4 = new Class({ 
initialize: function Vector4(x, y, z, w){ 
this.x = 0; 
this.y = 0; 
this.z = 0; 
this.w = 0; 
if (typeof x === 'object') { 
this.x = x.x || 0; 
this.y = x.y || 0; 
this.z = x.z || 0; 
this.w = x.w || 0; 
} 
 else { 
this.x = x || 0; 
this.y = y || 0; 
this.z = z || 0; 
this.w = w || 0; 
} 
} 
,
clone: function (){ 
return new Vector4(this.x, this.y, this.z, this.w); 
} 
,
copy: function (src){ 
this.x = src.x; 
this.y = src.y; 
this.z = src.z || 0; 
this.w = src.w || 0; 
return this; 
} 
,
equals: function (v){ 
return ((this.x === v.x) && (this.y === v.y) && (this.z === v.z) && (this.w === v.w)); 
} 
,
set: function (x, y, z, w){ 
if (typeof x === 'object') { 
this.x = x.x || 0; 
this.y = x.y || 0; 
this.z = x.z || 0; 
this.w = x.w || 0; 
} 
 else { 
this.x = x || 0; 
this.y = y || 0; 
this.z = z || 0; 
this.w = w || 0; 
} 
return this; 
} 
,
add: function (v){ 
this.x += v.x; 
this.y += v.y; 
this.z += v.z || 0; 
this.w += v.w || 0; 
return this; 
} 
,
subtract: function (v){ 
this.x -= v.x; 
this.y -= v.y; 
this.z -= v.z || 0; 
this.w -= v.w || 0; 
return this; 
} 
,
scale: function (scale){ 
this.x *= scale; 
this.y *= scale; 
this.z *= scale; 
this.w *= scale; 
return this; 
} 
,
length: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var w = this.w; 
return Math.sqrt(x * x + y * y + z * z + w * w); 
} 
,
lengthSq: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var w = this.w; 
return x * x + y * y + z * z + w * w; 
} 
,
normalize: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var w = this.w; 
var len = x * x + y * y + z * z + w * w; 
if (len > 0) { 
len = 1 / Math.sqrt(len); 
this.x = x * len; 
this.y = y * len; 
this.z = z * len; 
this.w = w * len; 
} 
return this; 
} 
,
dot: function (v){ 
return this.x * v.x + this.y * v.y + this.z * v.z + this.w * v.w; 
} 
,
lerp: function (v, t){ 
if (t === undefined) { 
t = 0; 
} 
var ax = this.x; 
var ay = this.y; 
var az = this.z; 
var aw = this.w; 
this.x = ax + t * (v.x - ax); 
this.y = ay + t * (v.y - ay); 
this.z = az + t * (v.z - az); 
this.w = aw + t * (v.w - aw); 
return this; 
} 
,
multiply: function (v){ 
this.x *= v.x; 
this.y *= v.y; 
this.z *= v.z || 1; 
this.w *= v.w || 1; 
return this; 
} 
,
divide: function (v){ 
this.x /= v.x; 
this.y /= v.y; 
this.z /= v.z || 1; 
this.w /= v.w || 1; 
return this; 
} 
,
distance: function (v){ 
var dx = v.x - this.x; 
var dy = v.y - this.y; 
var dz = v.z - this.z || 0; 
var dw = v.w - this.w || 0; 
return Math.sqrt(dx * dx + dy * dy + dz * dz + dw * dw); 
} 
,
distanceSq: function (v){ 
var dx = v.x - this.x; 
var dy = v.y - this.y; 
var dz = v.z - this.z || 0; 
var dw = v.w - this.w || 0; 
return dx * dx + dy * dy + dz * dz + dw * dw; 
} 
,
negate: function (){ 
this.x = - this.x; 
this.y = - this.y; 
this.z = - this.z; 
this.w = - this.w; 
return this; 
} 
,
transformMat4: function (mat){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var w = this.w; 
var m = mat.val; 
this.x = m[0] * x + m[4] * y + m[8] * z + m[12] * w; 
this.y = m[1] * x + m[5] * y + m[9] * z + m[13] * w; 
this.z = m[2] * x + m[6] * y + m[10] * z + m[14] * w; 
this.w = m[3] * x + m[7] * y + m[11] * z + m[15] * w; 
return this; 
} 
,
transformQuat: function (q){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var qx = q.x; 
var qy = q.y; 
var qz = q.z; 
var qw = q.w; 
var ix = qw * x + qy * z - qz * y; 
var iy = qw * y + qz * x - qx * z; 
var iz = qw * z + qx * y - qy * x; 
var iw = - qx * x - qy * y - qz * z; 
this.x = ix * qw + iw * - qx + iy * - qz - iz * - qy; 
this.y = iy * qw + iw * - qy + iz * - qx - ix * - qz; 
this.z = iz * qw + iw * - qz + ix * - qy - iy * - qx; 
return this; 
} 
,
reset: function (){ 
this.x = 0; 
this.y = 0; 
this.z = 0; 
this.w = 0; 
return this; 
} 
}
); 
Vector4.prototype.sub = Vector4.prototype.subtract; 
Vector4.prototype.mul = Vector4.prototype.multiply; 
Vector4.prototype.div = Vector4.prototype.divide; 
Vector4.prototype.dist = Vector4.prototype.distance; 
Vector4.prototype.distSq = Vector4.prototype.distanceSq; 
Vector4.prototype.len = _AN_Read_length('length', Vector4.prototype); 
Vector4.prototype.lenSq = Vector4.prototype.lengthSq; 
module.exports = Vector4;