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/*!
* Stylus - HSLA
* Copyright (c) Automattic <developer.wordpress.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Node = require('./node')
, nodes = require('./');
/**
* Initialize a new `HSLA` with the given h,s,l,a component values.
*
* @param {Number} h
* @param {Number} s
* @param {Number} l
* @param {Number} a
* @api public
*/
var HSLA = exports = module.exports = function HSLA(h,s,l,a){
Node.call(this);
this.h = clampDegrees(h);
this.s = clampPercentage(s);
this.l = clampPercentage(l);
this.a = clampAlpha(a);
this.hsla = this;
};
/**
* Inherit from `Node.prototype`.
*/
HSLA.prototype.__proto__ = Node.prototype;
/**
* Return hsla(n,n,n,n).
*
* @return {String}
* @api public
*/
HSLA.prototype.toString = function(){
return 'hsla('
+ this.h + ','
+ this.s.toFixed(0) + '%,'
+ this.l.toFixed(0) + '%,'
+ this.a + ')';
};
/**
* Return a clone of this node.
*
* @return {Node}
* @api public
*/
HSLA.prototype.clone = function(parent){
var clone = new HSLA(
this.h
, this.s
, this.l
, this.a);
clone.lineno = this.lineno;
clone.column = this.column;
clone.filename = this.filename;
return clone;
};
/**
* Return a JSON representation of this node.
*
* @return {Object}
* @api public
*/
HSLA.prototype.toJSON = function(){
return {
__type: 'HSLA',
h: this.h,
s: this.s,
l: this.l,
a: this.a,
lineno: this.lineno,
column: this.column,
filename: this.filename
};
};
/**
* Return rgba `RGBA` representation.
*
* @return {RGBA}
* @api public
*/
HSLA.prototype.__defineGetter__('rgba', function(){
return nodes.RGBA.fromHSLA(this);
});
/**
* Return hash.
*
* @return {String}
* @api public
*/
HSLA.prototype.__defineGetter__('hash', function(){
return this.rgba.toString();
});
/**
* Add h,s,l to the current component values.
*
* @param {Number} h
* @param {Number} s
* @param {Number} l
* @return {HSLA} new node
* @api public
*/
HSLA.prototype.add = function(h,s,l){
return new HSLA(
this.h + h
, this.s + s
, this.l + l
, this.a);
};
/**
* Subtract h,s,l from the current component values.
*
* @param {Number} h
* @param {Number} s
* @param {Number} l
* @return {HSLA} new node
* @api public
*/
HSLA.prototype.sub = function(h,s,l){
return this.add(-h, -s, -l);
};
/**
* Operate on `right` with the given `op`.
*
* @param {String} op
* @param {Node} right
* @return {Node}
* @api public
*/
HSLA.prototype.operate = function(op, right){
switch (op) {
case '==':
case '!=':
case '<=':
case '>=':
case '<':
case '>':
case 'is a':
case '||':
case '&&':
return this.rgba.operate(op, right);
default:
return this.rgba.operate(op, right).hsla;
}
};
/**
* Return `HSLA` representation of the given `color`.
*
* @param {RGBA} color
* @return {HSLA}
* @api public
*/
exports.fromRGBA = function(rgba){
var r = rgba.r / 255
, g = rgba.g / 255
, b = rgba.b / 255
, a = rgba.a;
var min = Math.min(r,g,b)
, max = Math.max(r,g,b)
, l = (max + min) / 2
, d = max - min
, h, s;
switch (max) {
case min: h = 0; break;
case r: h = 60 * (g-b) / d; break;
case g: h = 60 * (b-r) / d + 120; break;
case b: h = 60 * (r-g) / d + 240; break;
}
if (max == min) {
s = 0;
} else if (l < .5) {
s = d / (2 * l);
} else {
s = d / (2 - 2 * l);
}
h %= 360;
s *= 100;
l *= 100;
return new HSLA(h,s,l,a);
};
/**
* Adjust lightness by `percent`.
*
* @param {Number} percent
* @return {HSLA} for chaining
* @api public
*/
HSLA.prototype.adjustLightness = function(percent){
this.l = clampPercentage(this.l + this.l * (percent / 100));
return this;
};
/**
* Adjust hue by `deg`.
*
* @param {Number} deg
* @return {HSLA} for chaining
* @api public
*/
HSLA.prototype.adjustHue = function(deg){
this.h = clampDegrees(this.h + deg);
return this;
};
/**
* Clamp degree `n` >= 0 and <= 360.
*
* @param {Number} n
* @return {Number}
* @api private
*/
function clampDegrees(n) {
n = n % 360;
return n >= 0 ? n : 360 + n;
}
/**
* Clamp percentage `n` >= 0 and <= 100.
*
* @param {Number} n
* @return {Number}
* @api private
*/
function clampPercentage(n) {
return Math.max(0, Math.min(n, 100));
}
/**
* Clamp alpha `n` >= 0 and <= 1.
*
* @param {Number} n
* @return {Number}
* @api private
*/
function clampAlpha(n) {
return Math.max(0, Math.min(n, 1));
}