var Class = require('../utils/Class'); 
var Vector3 = new Class({ 
initialize: function Vector3(x, y, z){ 
this.x = 0; 
this.y = 0; 
this.z = 0; 
if (typeof x === 'object') { 
this.x = x.x || 0; 
this.y = x.y || 0; 
this.z = x.z || 0; 
} 
 else { 
this.x = x || 0; 
this.y = y || 0; 
this.z = z || 0; 
} 
} 
,
up: function (){ 
this.x = 0; 
this.y = 1; 
this.z = 0; 
return this; 
} 
,
clone: function (){ 
return new Vector3(this.x, this.y, this.z); 
} 
,
crossVectors: function (a, b){ 
var ax = a.x; 
var ay = a.y; 
var az = a.z; 
var bx = b.x; 
var by = b.y; 
var bz = b.z; 
this.x = ay * bz - az * by; 
this.y = az * bx - ax * bz; 
this.z = ax * by - ay * bx; 
return this; 
} 
,
equals: function (v){ 
return ((this.x === v.x) && (this.y === v.y) && (this.z === v.z)); 
} 
,
copy: function (src){ 
this.x = src.x; 
this.y = src.y; 
this.z = src.z || 0; 
return this; 
} 
,
set: function (x, y, z){ 
if (typeof x === 'object') { 
this.x = x.x || 0; 
this.y = x.y || 0; 
this.z = x.z || 0; 
} 
 else { 
this.x = x || 0; 
this.y = y || 0; 
this.z = z || 0; 
} 
return this; 
} 
,
add: function (v){ 
this.x += v.x; 
this.y += v.y; 
this.z += v.z || 0; 
return this; 
} 
,
subtract: function (v){ 
this.x -= v.x; 
this.y -= v.y; 
this.z -= v.z || 0; 
return this; 
} 
,
multiply: function (v){ 
this.x *= v.x; 
this.y *= v.y; 
this.z *= v.z || 1; 
return this; 
} 
,
scale: function (scale){ 
if (isFinite(scale)) { 
this.x *= scale; 
this.y *= scale; 
this.z *= scale; 
} 
 else { 
this.x = 0; 
this.y = 0; 
this.z = 0; 
} 
return this; 
} 
,
divide: function (v){ 
this.x /= v.x; 
this.y /= v.y; 
this.z /= v.z || 1; 
return this; 
} 
,
negate: function (){ 
this.x = - this.x; 
this.y = - this.y; 
this.z = - this.z; 
return this; 
} 
,
distance: function (v){ 
var dx = v.x - this.x; 
var dy = v.y - this.y; 
var dz = v.z - this.z || 0; 
return Math.sqrt(dx * dx + dy * dy + dz * dz); 
} 
,
distanceSq: function (v){ 
var dx = v.x - this.x; 
var dy = v.y - this.y; 
var dz = v.z - this.z || 0; 
return dx * dx + dy * dy + dz * dz; 
} 
,
length: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
return Math.sqrt(x * x + y * y + z * z); 
} 
,
lengthSq: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
return x * x + y * y + z * z; 
} 
,
normalize: function (){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var len = x * x + y * y + z * z; 
if (len > 0) { 
len = 1 / Math.sqrt(len); 
this.x = x * len; 
this.y = y * len; 
this.z = z * len; 
} 
return this; 
} 
,
dot: function (v){ 
return this.x * v.x + this.y * v.y + this.z * v.z; 
} 
,
cross: function (v){ 
var ax = this.x; 
var ay = this.y; 
var az = this.z; 
var bx = v.x; 
var by = v.y; 
var bz = v.z; 
this.x = ay * bz - az * by; 
this.y = az * bx - ax * bz; 
this.z = ax * by - ay * bx; 
return this; 
} 
,
lerp: function (v, t){ 
if (t === undefined) { 
t = 0; 
} 
var ax = this.x; 
var ay = this.y; 
var az = this.z; 
this.x = ax + t * (v.x - ax); 
this.y = ay + t * (v.y - ay); 
this.z = az + t * (v.z - az); 
return this; 
} 
,
transformMat3: function (mat){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var m = mat.val; 
this.x = x * m[0] + y * m[3] + z * m[6]; 
this.y = x * m[1] + y * m[4] + z * m[7]; 
this.z = x * m[2] + y * m[5] + z * m[8]; 
return this; 
} 
,
transformMat4: function (mat){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var m = mat.val; 
this.x = m[0] * x + m[4] * y + m[8] * z + m[12]; 
this.y = m[1] * x + m[5] * y + m[9] * z + m[13]; 
this.z = m[2] * x + m[6] * y + m[10] * z + m[14]; 
return this; 
} 
,
transformCoordinates: function (mat){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var m = mat.val; 
var tx = (x * m[0]) + (y * m[4]) + (z * m[8]) + m[12]; 
var ty = (x * m[1]) + (y * m[5]) + (z * m[9]) + m[13]; 
var tz = (x * m[2]) + (y * m[6]) + (z * m[10]) + m[14]; 
var tw = (x * m[3]) + (y * m[7]) + (z * m[11]) + m[15]; 
this.x = tx / tw; 
this.y = ty / tw; 
this.z = tz / tw; 
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; 
} 
,
project: function (mat){ 
var x = this.x; 
var y = this.y; 
var z = this.z; 
var m = mat.val; 
var a00 = m[0]; 
var a01 = m[1]; 
var a02 = m[2]; 
var a03 = m[3]; 
var a10 = m[4]; 
var a11 = m[5]; 
var a12 = m[6]; 
var a13 = m[7]; 
var a20 = m[8]; 
var a21 = m[9]; 
var a22 = m[10]; 
var a23 = m[11]; 
var a30 = m[12]; 
var a31 = m[13]; 
var a32 = m[14]; 
var a33 = m[15]; 
var lw = 1 / (x * a03 + y * a13 + z * a23 + a33); 
this.x = (x * a00 + y * a10 + z * a20 + a30) * lw; 
this.y = (x * a01 + y * a11 + z * a21 + a31) * lw; 
this.z = (x * a02 + y * a12 + z * a22 + a32) * lw; 
return this; 
} 
,
unproject: function (viewport, invProjectionView){ 
var viewX = viewport.x; 
var viewY = viewport.y; 
var viewWidth = viewport.z; 
var viewHeight = viewport.w; 
var x = this.x - viewX; 
var y = (viewHeight - this.y - 1) - viewY; 
var z = this.z; 
this.x = (2 * x) / viewWidth - 1; 
this.y = (2 * y) / viewHeight - 1; 
this.z = 2 * z - 1; 
return this.project(invProjectionView); 
} 
,
reset: function (){ 
this.x = 0; 
this.y = 0; 
this.z = 0; 
return this; 
} 
}
); 
module.exports = Vector3;