#
#  Created by Boyd Multerer on 2017-10-02.
#  Copyright © 2017 Kry10 Limited. All rights reserved.
#

defmodule Scenic.Primitive.Transform.Rotate do
  @moduledoc """
  Apply a rotation matrix.

  Always rotates around the z-axis (coming out of the screen).

  The value is given in radians.

  Positive values rotate clockwise.

  The rotation is pinned to the sensible default for each primitive, or to the
  [`:pin`](Scenic.Primitive.Transform.Pin.html) that you assign explicitly.

  Example:

  ```elixir
  graph
    |> text("Rotated!", rotate: 1.2)
    |> text("Rotated!", rotate: 1.2, pin: {10, 20})
  ```

  ### Shortcut

  Rotation is common enough that you can use `:r` as a shortcut.

  Example:
      graph
      |> text("Rotated!", r: 1.2)
  """
  use Scenic.Primitive.Transform

  # ============================================================================
  # data verification and serialization

  def validate(radians) when is_number(radians), do: {:ok, radians}

  def validate(data) do
    {
      :error,
      """
      #{IO.ANSI.red()}Invalid Rotation
      Received: #{inspect(data)}
      #{IO.ANSI.yellow()}
      The :rotate / :r option must be a number in radians#{IO.ANSI.default_color()}
      """
    }
  end
end