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90 lines
2.5 KiB
CoffeeScript
90 lines
2.5 KiB
CoffeeScript
_ = require 'underscore'
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ParsedColor = null
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# Essential: A simple color class returned from {Config::get} when the value
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# at the key path is of type 'color'.
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module.exports =
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class Color
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# Essential: Parse a {String} or {Object} into a {Color}.
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#
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# * `value` A {String} such as `'white'`, `#ff00ff`, or
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# `'rgba(255, 15, 60, .75)'` or an {Object} with `red`, `green`, `blue`,
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# and `alpha` properties.
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#
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# Returns a {Color} or `null` if it cannot be parsed.
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@parse: (value) ->
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return null if _.isArray(value) or _.isFunction(value)
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return null unless _.isObject(value) or _.isString(value)
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ParsedColor ?= require 'color'
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try
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parsedColor = new ParsedColor(value)
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catch error
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return null
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new Color(parsedColor.red(), parsedColor.green(), parsedColor.blue(), parsedColor.alpha())
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constructor: (red, green, blue, alpha) ->
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Object.defineProperties this,
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red:
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set: (newRed) -> red = parseColor(newRed)
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get: -> red
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enumerable: true
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configurable: false
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green:
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set: (newGreen) -> green = parseColor(newGreen)
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get: -> green
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enumerable: true
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configurable: false
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blue:
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set: (newBlue) -> blue = parseColor(newBlue)
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get: -> blue
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enumerable: true
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configurable: false
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alpha:
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set: (newAlpha) -> alpha = parseAlpha(newAlpha)
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get: -> alpha
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enumerable: true
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configurable: false
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@red = red
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@green = green
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@blue = blue
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@alpha = alpha
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# Essential: Returns a {String} in the form `'#abcdef'`.
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toHexString: ->
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"##{numberToHexString(@red)}#{numberToHexString(@green)}#{numberToHexString(@blue)}"
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# Essential: Returns a {String} in the form `'rgba(25, 50, 75, .9)'`.
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toRGBAString: ->
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"rgba(#{@red}, #{@green}, #{@blue}, #{@alpha})"
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isEqual: (color) ->
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return true if this is color
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color = Color.parse(color) unless color instanceof Color
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return false unless color?
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color.red is @red and color.blue is @blue and color.green is @green and color.alpha is @alpha
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clone: -> new Color(@red, @green, @blue, @alpha)
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parseColor = (color) ->
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color = parseInt(color)
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color = 0 if isNaN(color)
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color = Math.max(color, 0)
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color = Math.min(color, 255)
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color
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parseAlpha = (alpha) ->
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alpha = parseFloat(alpha)
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alpha = 1 if isNaN(alpha)
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alpha = Math.max(alpha, 0)
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alpha = Math.min(alpha, 1)
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alpha
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numberToHexString = (number) ->
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hex = number.toString(16)
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hex = "0#{hex}" if number < 10
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hex
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