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color.js
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color.js
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import * as _ from './helpers'
import Stateless from 'stateless'
/**
* Color is our heavy lifter. In order for a Color to be convertable you need a
* converter, conversions, a space, and a value to all be defined. This is a lot
* of pre-requisites so Color was designed to be built over 3 stages of
* inheritance, including a few of the requirements at a time.
*
* BaseSpace (converter)
* V
* ColorSpace (conversions, space)
* V
* Color (value)
*
* Example:
* - All colors should have their own values
* - All "rgb" colors should have the same set of conversions
* - All colors in general should have common conversion logic contained in a
* converter.
*
* Color methods should be defined on the BaseSpace to ensure all colors up
* the chain receive the same methods without having to add them on the fly
* during Color creation
*/
var Color = Stateless.extend()
/**
* Initializes Color's state. Is called on create()
*/
Color.init = function init (value, options) {
if (_.isPlainObject(arguments[0])) {
options = arguments[0]
} else if (value !== undefined) {
if (this.limits) this.value = this.limits.check(value);
else this.value = value;
}
options = options || {}
// BaseSpace
if (options.limiter) this.limits = options.limiter;
if (options.precision) this.precision = options.precision;
if (options.converter) this.converter = options.converter;
// ColorSpace
if (options.conversions) this.conversions = options.conversions;
if (options.space) this.space = options.space;
this.is_concrete = !options.abstract
}
/**
* Converts a color and returns its values
*/
Color.to = function to (target_name, options) {
options = options || {}
var color = this.as(target_name)
if (options.precision === null) return color.val;
else return color.round(options.precision)
}
/**
* Converts a color and returns the new color
*/
Color.as = function as (target_name) {
return this.converter.convert(this, target_name)
}
/**
* Rounds the value to the given precision.
* If a precision isn't provided, it uses the default
*/
Color.round = function round (precision) {
return _.round(this.value, precision || this.precision)
}
export default Color