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chameleon

2.4.0
2.5.0 2.4.0 2.3.1 2.3.0 2.2.1 2.2.0 2.1.0 2.0.1-pre3 2.0.1-pre2 2.0.1-pre1 2.0.0 retired 1.1.0 retired 1.0.3 retired 1.0.2 retired 1.0.1 retired 1.0.0 retired

Chameleon is a utility for converting colors from one color model to another. Conversions can be made to/from RGB, CMYK, Hex, HSL, Pantone, and even Keywords. For example: "FFFFFF" -> %{c: 0, m: 0, y: 0, k: 0}

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chameleon lib chameleon cmyk.ex
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lib/chameleon/cmyk.ex 

defmodule Chameleon.CMYK do

  alias Chameleon.CMYK



  @enforce_keys [:c, :m, :y, :k]

  defstruct @enforce_keys



  @type t() :: %__MODULE__{c: integer(), m: integer(), y: integer(), k: integer()}



  @doc """

  Creates a new color struct.



  ## Examples



      iex> _cmyk = Chameleon.CMYK.new(25, 30, 80, 0)

      %Chameleon.CMYK{c: 25, m: 30, y: 80, k: 0}



  """

  @spec new(non_neg_integer(), non_neg_integer(), non_neg_integer(), non_neg_integer()) ::

          Chameleon.CMYK.t()

  def new(c, m, y, k), do: %__MODULE__{c: c, m: m, y: y, k: k}



  defimpl Chameleon.Color.RGB do

    def from(cmyk), do: CMYK.to_rgb(cmyk)

  end



  #### / Conversion Functions / ########################################



  @doc false

  @spec to_rgb(Chameleon.CMYK.t()) :: Chameleon.RGB.t() | {:error, String.t()}

  def to_rgb(cmyk) do

    [c, m, y, k] = Enum.map([cmyk.c, cmyk.m, cmyk.y, cmyk.k], fn v -> v / 100.0 end)



    r = round(255.0 * (1.0 - c) * (1.0 - k))

    g = round(255.0 * (1.0 - m) * (1.0 - k))

    b = round(255.0 * (1.0 - y) * (1.0 - k))



    Chameleon.RGB.new(r, g, b)

  end

end