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velixir

0.0.7
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VElixir is a simple to use primitive 3D graphics library. It offers great performance, and ease of use. VElixir was inspired by VPython, which makes basic 3D graphics in python trivial. Now it's just as easy to make 3D graphical visualizations in Elixir.

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velixir lib rgb.ex
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lib/rgb.ex 

defmodule Rgb do

  use VElixir.GenServer



  def start_link(opts \\ []) do

    GenServer.start_link(__MODULE__, nil, opts)

  end



  def init(_) do

    {:ok, _} = VElixir.start_link



    r = 0.3

    x = 2*r/:math.sqrt(2)

    state = %{

      objects: [

        %{vtype: Cone, pos: V.new(-x, x, 0), radius: r, color: Color.new(1, 0, 0), height: r},

        %{vtype: Cylinder, pos: V.new(0, 0, 0),  radius: r, color: Color.new(0, 1, 0), height: r},

        %{vtype: Sphere, pos: V.new(x, -x, 0), radius: r, color: Color.new(0, 0, 1)},

      ],

      render: [:objects]

    }



    {:ok, state}

  end



  def handle_cast({:update, dt, t}, state) do

    dy = :math.cos(0.5*:math.pi*t)

    rotatePoint = Enum.at(state.objects, 1).pos

    objects = Enum.map(state.objects, fn obj ->

      obj

        |> Map.put(:pos, obj.pos + V.new(0, dt*dy, 0))

        |> Map.put(:post_transform, Transform.rotate(t*:math.pi*0.5, V.new(1, 1, 0), rotatePoint))

    end)

    {:noreply, %{state|objects: objects}}

  end

end