var Clamp = require('../../math/Clamp'); 
var _FLAG = 2; 
var Alpha = { 
_alpha: 1,
_alphaTL: 1,
_alphaTR: 1,
_alphaBL: 1,
_alphaBR: 1,
clearAlpha: function (){ 
return this.setAlpha(1); 
} 
,
setAlpha: function (topLeft, topRight, bottomLeft, bottomRight){ 
if (topLeft === undefined) { 
topLeft = 1; 
} 
if (topRight === undefined) { 
this.alpha = topLeft; 
} 
 else { 
this._alphaTL = Clamp(topLeft, 0, 1); 
this._alphaTR = Clamp(topRight, 0, 1); 
this._alphaBL = Clamp(bottomLeft, 0, 1); 
this._alphaBR = Clamp(bottomRight, 0, 1); 
} 
return this; 
} 
,
alpha: { 
get: function (){ 
return this._alpha; 
} 
,
set: function (value){ 
var v = Clamp(value, 0, 1); 
this._alpha = v; 
this._alphaTL = v; 
this._alphaTR = v; 
this._alphaBL = v; 
this._alphaBR = v; 
if (v === 0) { 
this.renderFlags &= ~_FLAG; 
} 
 else { 
this.renderFlags |= _FLAG; 
} 
} 
}
,
alphaTopLeft: { 
get: function (){ 
return this._alphaTL; 
} 
,
set: function (value){ 
var v = Clamp(value, 0, 1); 
this._alphaTL = v; 
if (v !== 0) { 
this.renderFlags |= _FLAG; 
} 
} 
}
,
alphaTopRight: { 
get: function (){ 
return this._alphaTR; 
} 
,
set: function (value){ 
var v = Clamp(value, 0, 1); 
this._alphaTR = v; 
if (v !== 0) { 
this.renderFlags |= _FLAG; 
} 
} 
}
,
alphaBottomLeft: { 
get: function (){ 
return this._alphaBL; 
} 
,
set: function (value){ 
var v = Clamp(value, 0, 1); 
this._alphaBL = v; 
if (v !== 0) { 
this.renderFlags |= _FLAG; 
} 
} 
}
,
alphaBottomRight: { 
get: function (){ 
return this._alphaBR; 
} 
,
set: function (value){ 
var v = Clamp(value, 0, 1); 
this._alphaBR = v; 
if (v !== 0) { 
this.renderFlags |= _FLAG; 
} 
} 
}
}
; 
module.exports = Alpha;