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[cellular-automata.git] / polymorphic-life / 001 / src / polymorphic_life.ml

diff --git a/polymorphic-life/001/src/polymorphic_life.ml b/polymorphic-life/001/src/polymorphic_life.ml
index c28852a..8ad51f9 100644 (file)
--- a/polymorphic-life/001/src/polymorphic_life.ml
+++ b/polymorphic-life/001/src/polymorphic_life.ml
@@ -2,42 +2,76 @@ open Core.Std
 
 
 module type MATRIX = sig
-  type 'a t
+  module Point : sig
+    type t = {r : int; k : int}
+  end
 
-  val create : rows:int -> cols:int -> data:'a -> 'a t
+  type 'a t
 
-  val get : 'a t -> row:int -> col:int -> 'a
+  val create : rs:int -> ks:int -> data:'a -> 'a t
 
-  val set : 'a t -> row:int -> col:int -> data:'a -> unit
+  val get_neighbors : 'a t -> Point.t -> 'a list
 
   val map : 'a t -> f:('a -> 'b) -> 'b t
 
-  val mapi : 'a t -> f:(row:int -> col:int -> data:'a -> 'b) -> 'b t
+  val mapi : 'a t -> f:(Point.t -> data:'a -> 'b) -> 'b t
 
-  val iter : 'a t -> f:(row:int -> col:int -> data:'a -> unit) -> unit
+  val iter : 'a t -> f:(Point.t -> data:'a -> unit) -> unit
 
   val print : 'a t -> to_string:('a -> string) -> unit
 end
 
 module Matrix : MATRIX = struct
+  module Point = struct
+    type t = {r : int; k : int}
+
+    let (+) p p' =
+      { r = p.r + p'.r
+      ; k = p.k + p'.k
+      }
+  end
+
+  module Direction = struct
+    type t = NW | N | NE
+           | W  |     E
+           | SW | S | SE
+
+    let all = [ NW ; N ; NE
+              ; W  ;     E
+              ; SW ; S ; SE
+              ]
+
+    let to_offset =
+      let open Point in
+      function
+      | NW -> {r = -1; k = -1}
+      | N  -> {r = -1; k =  0}
+      | NE -> {r = -1; k =  1}
+      | W  -> {r =  0; k = -1}
+      | E  -> {r =  0; k =  1}
+      | SW -> {r =  1; k = -1}
+      | S  -> {r =  1; k =  0}
+      | SE -> {r =  1; k =  1}
+  end
+
   type 'a t = 'a array array
 
-  let create ~rows ~cols ~data =
-    Array.make_matrix ~dimx:rows ~dimy:cols data
+  let create ~rs ~ks ~data =
+    Array.make_matrix ~dimx:rs ~dimy:ks data
 
   let iter t ~f =
     Array.iteri t ~f:(
-      fun row cols ->
-        Array.iteri cols ~f:(
-          fun col data ->
-            f ~row ~col ~data
+      fun r ks ->
+        Array.iteri ks ~f:(
+          fun k data ->
+            f {Point.r; Point.k} ~data
         )
     )
 
   let print t ~to_string =
     Array.iter t ~f:(
-      fun row ->
-        Array.iter row ~f:(fun x -> printf "%s" (to_string x));
+      fun r ->
+        Array.iter r ~f:(fun x -> printf "%s" (to_string x));
         print_newline ()
     )
 
@@ -46,25 +80,37 @@ module Matrix : MATRIX = struct
 
   let mapi t ~f =
     Array.mapi t ~f:(
-      fun row cols ->
-        Array.mapi cols ~f:(
-          fun col data ->
-            f ~row ~col ~data
+      fun r ks ->
+        Array.mapi ks ~f:(
+          fun k data ->
+            f {Point.r; Point.k} ~data
         )
     )
 
-  let get t ~row ~col =
-    t.(row).(col)
+  let get t {Point.r; Point.k} =
+    t.(r).(k)
 
-  let set t ~row ~col ~data =
-    t.(row).(col) <- data
+  let is_within_bounds t {Point.r; Point.k} =
+    match t with
+    | [||] -> assert false
+    | t ->
+      r >= 0 && r < Array.length t &&
+      k >= 0 && k < Array.length t.(0)
+
+  let neighborhood t point =
+    List.map Direction.all ~f:Direction.to_offset
+    |> List.map ~f:(fun offset_point -> Point.(point + offset_point))
+    |> List.filter ~f:(is_within_bounds t)
+
+  let get_neighbors t point =
+    List.map (neighborhood t point) ~f:(get t)
 end
 
 
 module type CELL = sig
   type t
 
-  val init : unit -> t
+  val create : unit -> t
 
   val to_string : t -> string
 
@@ -90,7 +136,7 @@ module Conway : CELL = struct
     | D -> " "
     | A -> "o"
 
-  let init () =
+  let create () =
     Random.int 2 |> of_int
 
   let state = to_int
@@ -107,20 +153,39 @@ module Conway : CELL = struct
 end
 
 
-let main rows cols () =
+type opt = { interval : Time.Span.t
+           ; bar      : string
+           }
+
+
+let rec loop opt grid =
+  print_endline opt.bar;
+  Matrix.print grid ~to_string:Conway.to_string;
+  print_endline opt.bar;
+
+  let grid =
+    Matrix.mapi grid ~f:(fun point ~data:cell ->
+      let neighbors = Matrix.get_neighbors grid point in
+      Conway.react cell ~states:(List.map neighbors ~f:Conway.state)
+    )
+  in
+  Time.pause opt.interval;
+  loop opt grid
+
+
+let main () =
   Random.self_init ();
-  let grid = Matrix.create ~rows ~cols ~data:() |> Matrix.map ~f:Conway.init in
-  Matrix.print grid ~to_string:Conway.to_string
+  let rs, ks = Or_error.ok_exn Linux_ext.get_terminal_size () in
+  Matrix.create ~rs:(rs - 3) ~ks ~data:()
+  |> Matrix.map ~f:Conway.create
+  |> loop { interval = Time.Span.of_float 0.1
+          ; bar      = String.make ks '-'
+          }
 
 
 let spec =
   let summary = "Polymorphic Cellular Automata" in
-  let spec =
-    let open Command.Spec in
-    empty
-    +> flag "-rows" (optional_with_default 5 int) ~doc:"Height"
-    +> flag "-cols" (optional_with_default 5 int) ~doc:"Width"
-  in
+  let spec = Command.Spec.empty in
   Command.basic ~summary spec main