commit cf00dc57ba94a13493711cb8646b0711ab7a7765
Author: Julian Noble <julian@precisium.com.au>
Date:   Sun Sep 11 03:04:31 2022 +1000

    Tetris basic model

diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/.gitignore b/.gitignore
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index 0000000..7f84502
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+tetris-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
diff --git a/README.md b/README.md
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index 0000000..29a0de9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# Tetris
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `tetris` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:tetris, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at <https://hexdocs.pm/tetris>.
+
diff --git a/git.exe.stackdump b/git.exe.stackdump
new file mode 100644
index 0000000..b03cfb7
--- /dev/null
+++ b/git.exe.stackdump
@@ -0,0 +1,19 @@
+Stack trace:
+Frame        Function    Args
+000FFFFBBF0  00180062DF7 (000FFFFBDF8, 00000000002, 00000000002, 000FFFFDE50)
+00000000000  00180064EE5 (00000000064, 00000000000, 00000000420, 00000000000)
+000FFFFC300  00180136238 (00100000000, 000FFFFC708, 000FFFFC770, 000FFFFC798)
+00000000041  0018013186B (00100640281, 00000000000, 00000000000, 000FFFFC770)
+000FFFFC798  00180131C75 (000FFFFC770, 000FFFFC798, 001006F6B40, 000FFFFC750)
+000FFFFC798  00180218948 (00180111A72, 000FFFFC750, 00180194D3B, 000FFFFC6D8)
+000FFFFC798  00100668785 (00180249BA0, 001006E0C1D, 001006EB201, 0018027FF30)
+000FFFFC798  001005EF056 (00000000002, 0010068C902, 000000000AC, 00000323731)
+00100747200  001005A21A2 (000FFFFCC58, 00000000000, 0010061F260, 0010068D3B0)
+00100747200  0010042D381 (0018005DAE7, 008000628B5, 0010060E7D0, 001007477C0)
+00100747200  0010040203B (00180249BA0, 00000000000, 001800DB27E, 00000000030)
+000FFFFCC58  001004025A3 (000FFFFCC58, 04949435341, 000FFFFCC70, 00180328FE0)
+000FFFFCD30  001006686E4 (00000000020, 00000000000, 00180049B25, 000FFFFCC70)
+000FFFFCD30  00180049B91 (00000000000, 00000000000, 00000000000, 00000000000)
+000FFFFFFF0  00180047716 (00000000000, 00000000000, 00000000000, 00000000000)
+000FFFFFFF0  001800477C4 (00000000000, 00000000000, 00000000000, 00000000000)
+End of stack trace
diff --git a/lib/brick.ex b/lib/brick.ex
new file mode 100644
index 0000000..acedf07
--- /dev/null
+++ b/lib/brick.ex
@@ -0,0 +1,152 @@
+defmodule Tetris.Brick  do
+  alias Tetris.Points
+
+  @x_centre 40
+
+  defstruct [
+    name: :i,
+    location: {40,0},
+    rotation: 0,
+    reflection: false
+  ]
+
+  def new(attributes \\ []), do: __struct__(attributes)
+
+  def new_random() do
+    %__MODULE__{
+      name: random_name(),
+      location: {40,0},
+      rotation: random_rotation(),
+      reflection: random_reflection()
+    }
+  end
+
+  def random_name() do
+    ~w(i l z o t)a
+    |> Enum.random()
+  end
+
+  def random_rotation() do
+    [0, 90, 180, 270]
+    |> Enum.random()
+  end
+
+
+  def random_reflection() do
+    [true, false]
+    |> Enum.random
+  end
+
+  def left(brick) do
+    %{brick| location: point_left(brick.location)}
+  end
+
+  def right(brick) do
+    %{brick| location: point_right(brick.location)}
+  end
+
+  def down(brick) do
+    %{brick| location: point_down(brick.location)}
+  end
+
+  def point_down({x,y}) do
+    {x,y+1}
+  end
+  def point_left({x,y}) do
+    {x-1,y}
+  end
+  def point_right({x,y}) do
+    {x+1,y}
+  end
+
+  def spin_90(brick) do
+    %{brick| rotation: rotate(brick.rotation)}
+  end
+  def rotate(270), do: 0
+  def rotate(degrees), do: degrees + 90
+
+
+  def shape(%{name: :l}) do
+    [
+     {2,1},
+     {2,2},
+     {2,3}, {3,3}
+    ]
+  end
+  def shape(%{name: :i}) do
+    [
+     {2,1},
+     {2,2},
+     {2,3},
+     {2,4}
+    ]
+  end
+  def shape(%{name: :o}) do
+    [
+     {2,2}, {3,2},
+     {2,3}, {3,3}
+    ]
+  end
+  def shape(%{name: :z}) do
+    [
+      {2,2},
+      {2,3}, {3,3},
+             {3,4}
+     ]
+  end
+  def shape(%{name: :t}) do
+    [
+     {2,1},
+     {2,2}, {3,2} ,
+     {2,3}
+    ]
+  end
+
+  def prepare(brick) do
+    brick
+    |> shape
+    |> Points.rotate(brick.rotation)
+    |> Points.mirror(brick.reflection)
+  end
+
+  def to_string(brick) do
+    brick
+    |> prepare
+    |> Points.to_string
+  end
+
+  def print(brick) do
+    brick
+    |> prepare
+    |> Points.print
+
+    brick
+  end
+
+  def colour(%{name: :i}), do: :blue
+  def colour(%{name: :l}), do: :green
+  def colour(%{name: :z}), do: :orange
+  def colour(%{name: :o}), do: :red
+  def colour(%{name: :t}), do: :yellow
+
+
+
+  def x_centre(), do: @x_centre
+
+  defimpl Inspect do
+    import Inspect.Algebra
+    def inspect(brick, _opts) do
+      concat([
+        "\n",
+        Tetris.Brick.to_string(brick),
+        "\n",
+        "location  : #{inspect(brick.location)}",
+        "\n",
+        "reflection: #{inspect(brick.reflection)}",
+        "\n",
+        "rotation  : #{inspect(brick.rotation)}"
+        ])
+    end
+  end
+
+end
diff --git a/lib/points.ex b/lib/points.ex
new file mode 100644
index 0000000..4f1a258
--- /dev/null
+++ b/lib/points.ex
@@ -0,0 +1,68 @@
+defmodule Tetris.Points do
+
+  def move_to_location(points, {x,y}=_location) do
+    Enum.map(points,fn {dx, dy} -> {dx + x, dy + y} end )
+  end
+
+  def transpose(points) do
+    points
+    |> Enum.map( fn {x,y} -> {y,x} end )
+  end
+  def mirror(points) do
+    points
+    |> Enum.map( fn{x,y} -> {5-x,y} end )
+  end
+  def mirror(points, false), do: points
+  def mirror(points, true), do: mirror points
+
+  def flip(points) do
+    points
+    |> Enum.map( fn{x,y} -> {x,5-y} end )
+  end
+
+  def rotate_90(points) do
+    #by 90 degrees clockwise
+    points
+    |> transpose
+    |> mirror
+  end
+
+  def rotate(points, 0),  do: points
+  def rotate(points, degrees) do
+     rotate(
+       rotate_90(points),
+       degrees - 90
+     )
+  end
+
+  def with_colour(points, colour) do
+    Enum.map(points,fn point -> add_colour(point, colour) end)
+  end
+
+  defp add_colour({_x, _y, _c} = point, _colour), do: point
+  defp add_colour({x,y}, colour), do: {x,y,colour}
+
+
+
+  #🔴
+  #⬜
+  #🟥
+  def to_string(points) do
+    map =
+      points
+      |> Enum.map(fn key -> {key, "🟥"} end)
+      |> Map.new()
+
+   for y <- (1 .. 4), x <- (1 .. 4) do
+     Map.get(map,{x,y},"⬜")
+   end
+   |> Enum.chunk_every(4)
+   |> Enum.map(&Enum.join/1)
+   |> Enum.join("\n")
+  end
+
+  def print(points) do
+    IO.puts __MODULE__.to_string(points)
+    points
+  end
+end
diff --git a/lib/tetris.ex b/lib/tetris.ex
new file mode 100644
index 0000000..ba5aa00
--- /dev/null
+++ b/lib/tetris.ex
@@ -0,0 +1,6 @@
+defmodule Tetris do
+
+  def hello do
+    :world
+  end
+end
diff --git a/mix.exs b/mix.exs
new file mode 100644
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--- /dev/null
+++ b/mix.exs
@@ -0,0 +1,28 @@
+defmodule Tetris.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :tetris,
+      version: "0.1.0",
+      elixir: "~> 1.14",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/test/brick_test.exs b/test/brick_test.exs
new file mode 100644
index 0000000..d1e0247
--- /dev/null
+++ b/test/brick_test.exs
@@ -0,0 +1,98 @@
+defmodule BrickTest do
+  use ExUnit.Case
+
+  import Tetris.Brick
+  alias Tetris.Points
+
+  def new_brick(attributes \\[]), do: new(attributes)
+
+  test "Creates a new brick" do
+    assert new_brick().name == :i
+  end
+
+  test "Create a new random brick" do
+    actual = new_random()
+
+    assert actual.name in [:i, :l, :z, :t, :o]
+    assert actual.rotation in [0, 90, 180, 270]
+    assert actual.reflection in [true, false]
+
+  end
+
+  test "should manipulate brick" do
+    actual =
+      new_brick()
+      |> left
+      |> right
+      |> right
+      |> down
+      |> spin_90
+      |> spin_90
+
+      assert actual.location == {x_centre() + 1,1}
+      assert actual.rotation == 180
+  end
+
+  test "should return points for o shape" do
+    points =
+    new_brick(name: :o)
+    |> shape()
+
+    assert {3,3} in points
+  end
+
+
+  test "should translate a list of points" do
+    actual_points =
+      new_brick()
+      |> shape
+      |> Points.move_to_location({1,1})
+      |> Points.move_to_location({0,1})
+
+    assert actual_points ==   [{3, 3}, {3, 4}, {3, 5}, {3, 6}]
+  end
+
+  test "should mirror flip rotate and rotate" do
+    [{1,1}]
+    |> Points.mirror
+    |> assert_point({4,1})
+    |> Points. flip
+    |> assert_point({4,4})
+    |> Points.rotate_90
+    |> assert_point({1,4})
+    |> Points.rotate_90
+    |> assert_point({1,1})
+  end
+
+  def assert_point([actual],expected) do
+    assert actual == expected
+    [actual]
+  end
+
+  test "should convert brick to string" do
+    actual = new_brick() |> Tetris.Brick.to_string
+
+    expected = "⬜🟥⬜⬜\n⬜🟥⬜⬜\n⬜🟥⬜⬜\n⬜🟥⬜⬜"
+
+    assert actual == expected
+  end
+
+  test "should inspect bricks" do
+    actual = new_brick() |> inspect
+
+    expected =
+    """
+
+    ⬜🟥⬜⬜
+    ⬜🟥⬜⬜
+    ⬜🟥⬜⬜
+    ⬜🟥⬜⬜
+    location  : {#{x_centre()}, 0}
+    reflection: false
+    rotation  : 0
+    """
+    assert "#{actual}\n" == expected
+  end
+
+
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
new file mode 100644
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--- /dev/null
+++ b/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()
diff --git a/test/tetris_test.exs b/test/tetris_test.exs
new file mode 100644
index 0000000..731ca15
--- /dev/null
+++ b/test/tetris_test.exs
@@ -0,0 +1,7 @@
+defmodule TetrisTest do
+  use ExUnit.Case
+
+  test "greets the world" do
+    assert Tetris.hello() == :world
+  end
+end