From 861ef41797bbb192333dbffc1c9b67985c4f793d Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson@member.fsf.org>
Date: Mon, 31 Mar 2014 17:31:38 -0400
Subject: Rename example file.

* examples/guile-2048/guile-2048: Rename.

* examples/guile-2048/guile-2048.scm: New file.
---
 examples/guile-2048/guile-2048     | 482 -------------------------------------
 examples/guile-2048/guile-2048.scm | 482 +++++++++++++++++++++++++++++++++++++
 2 files changed, 482 insertions(+), 482 deletions(-)
 delete mode 100755 examples/guile-2048/guile-2048
 create mode 100755 examples/guile-2048/guile-2048.scm

diff --git a/examples/guile-2048/guile-2048 b/examples/guile-2048/guile-2048
deleted file mode 100755
index d5ded0a..0000000
--- a/examples/guile-2048/guile-2048
+++ /dev/null
@@ -1,482 +0,0 @@
-#! /usr/bin/env guile
-!#
-
-;;; guile-2048
-;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
-;;;
-;;; This program is free software: you can redistribute it and/or
-;;; modify it under the terms of the GNU General Public License as
-;;; published by the Free Software Foundation, either version 3 of the
-;;; License, or (at your option) any later version.
-;;;
-;;; This program is distributed in the hope that it will be useful,
-;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-;;; General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with this program.  If not, see
-;;; <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-;; Clone of the official 2048 game at http://gabrielecirulli.github.io/2048/
-;;
-;;; Code:
-
-(use-modules (srfi srfi-1)
-             (srfi srfi-9)
-             (srfi srfi-11)
-             (srfi srfi-26)
-             (srfi srfi-42)
-             (ice-9 match)
-             (ice-9 rdelim)
-             (gl)
-             (2d audio)
-             (2d color)
-             (2d font)
-             (2d game)
-             (2d keyboard)
-             (2d rect)
-             (2d signal)
-             (2d sprite)
-             (2d texture)
-             (2d vector2)
-             (2d window)
-             (2d repl))
-;;;
-;;; Helpers
-;;;
-
-(define* (flat-map proc lst . rest)
-  (concatenate (apply map proc lst rest)))
-
-(define (enumerate lst)
-  (zip (iota (length lst)) lst))
-
-;;;
-;;; Game Board
-;;;
-
-(define board-size 4)
-
-(define (double x)
-  (* x 2))
-
-(define (strip-zeros lst)
-  (delete 0 lst))
-
-(define (pad-zeros lst size)
-  (append lst (make-list (max (- size (length lst)) 0) 0)))
-
-(define (merge lst)
-  (match lst
-    ((x x . rest)
-     (cons (double x) (merge rest)))
-    ((x . rest)
-     (cons x (merge rest)))
-    (_ '())))
-
-(define (points a b)
-  (define (iter a b p)
-    (cond ((or (null? a)
-               (null? b))
-           p)
-          ((= (car a) (car b))
-           (iter (cdr a) (cdr b) p))
-          (else
-           (iter (cddr a) (cdr b) (+ p (car b))))))
-  (iter a b 0))
-
-;; Merge list and accumulate points.
-(define (merge-row row)
-  (let* ((stripped (strip-zeros row))
-         (merged (merge stripped)))
-    (list (points stripped merged)
-          (pad-zeros merged board-size))))
-
-(define (transpose board)
-  (if (null? (car board))
-      '()
-      (cons (map car board)
-            (transpose (map cdr board)))))
-
-(define (board-shift-left board)
-  (map merge-row board))
-
-(define (board-shift-right board)
-  (map (lambda (row)
-         (let ((merged (merge-row (reverse row))))
-           (list (first merged) (reverse (second merged)))))
-       board))
-
-(define (board-shift-up board)
-  (let-values (((points board)
-                (unzip2 (board-shift-left (transpose board)))))
-    (zip points (transpose board))))
-
-(define (board-shift-down board)
-  (let-values (((points board)
-                (unzip2 (board-shift-right (transpose board)))))
-    (zip points (transpose board))))
-
-(define (board-shift board direction)
-  (match direction
-    ('up
-     (board-shift-up board))
-    ('down
-     (board-shift-down board))
-    ('left
-     (board-shift-left board))
-    ('right
-     (board-shift-right board))
-    (_ board)))
-
-(define (board-shift-and-accum-points board direction)
-  (let-values (((points board)
-                (unzip2 (board-shift board direction))))
-    (values (reduce + 0 points)
-            board)))
-
-(define (random-tile)
-  (list-ref '(2 4) (random 2)))
-
-;; So gross.
-(define (board-insert board)
-  (let ((x (random board-size))
-        (y (random board-size)))
-    (if (zero? (list-ref (list-ref board y) x))
-        (append (take board y)
-                (let ((rows (drop board y)))
-                  (cons (let ((cells (car rows)))
-                          (append (take cells x)
-                                  (let ((rest (drop cells x)))
-                                    (cons (random-tile)
-                                          (cdr rest)))))
-                        (cdr rows))))
-        (board-insert board))))
-
-(define (board-find board n)
-  (list?
-   (any (lambda (row)
-          (memq n row))
-        board)))
-
-(define (board-win? board)
-  (board-find (make-board) 2048))
-
-(define (board-lose? board)
-  (define (full? row)
-    (define (iter row prev)
-      (cond ((null? row)
-             #t)
-            ((or (zero? (car row))
-                 (= (car row) prev))
-             #f)
-            (else
-             (iter (cdr row) (car row)))))
-    (iter row 0))
-  (and (every full? board)
-       (every full? (transpose board))))
-
-(define null-board
-  '((0 0 0 0)
-    (0 0 0 0)
-    (0 0 0 0)
-    (0 0 0 0)))
-
-(define (make-board)
-  (board-insert (board-insert null-board)))
-
-;;;
-;;; Game State
-;;;
-
-(define save-file
-  (string-join (list (getenv "HOME") ".guile-2048")
-               file-name-separator-string))
-
-(define-record-type <2048>
-  (make-2048 board score best-score)
-  2048?
-  (board 2048-board)
-  (score 2048-score)
-  (best-score 2048-best-score))
-
-(define* (new-game #:optional (previous #f))
-  (let ((best-score (if previous
-                        (choose-best-score previous)
-                        (load-best-score))))
-    (make-2048 (make-board) 0 best-score)))
-
-(define (load-best-score)
-  (if (file-exists? save-file)
-      (with-input-from-file save-file
-        (lambda ()
-          (let ((score (string->number (read-string))))
-            (if (number? score) score 0))))
-      0))
-
-(define (save-best-score state)
-  (with-output-to-file save-file
-    (lambda ()
-      (format #t "~d" (choose-best-score state)))))
-
-(define (choose-best-score state)
-  (max (2048-score state) (2048-best-score state)))
-
-(define-signal controls
-  (signal-filter
-   (lambda (key)
-     (any (cut eq? key <>)
-          '(up down left right n)))
-   #f key-last-down))
-
-(define-signal 2048-state
-  (signal-fold
-   (lambda (key prev)
-     (if (eq? key 'n)
-         (new-game prev)
-         (let-values (((points new-board)
-                       (board-shift-and-accum-points (2048-board prev) key)))
-           (let ((score (+ (2048-score prev) points)))
-             ;; Only insert a new tile if there's room and the board
-             ;; was actually shifted.
-             (if (and (not (equal? (2048-board prev) new-board))
-                      (board-find new-board 0))
-                 (make-2048 (board-insert new-board) score
-                            (2048-best-score prev))
-                 (make-2048 new-board score (2048-best-score prev)))))))
-   (new-game)
-   controls))
-
-;; For convenience
-(define-signal board
-  (signal-map 2048-board 2048-state))
-
-(define-signal score-saver
-  (signal-tap (lambda (state)
-                (when (board-lose? (2048-board state))
-                  (save-best-score state)))
-              2048-state))
-
-;;;
-;;; Rendering
-;;;
-
-(open-window)
-(enable-sprites)
-(enable-fonts)
-(enable-audio)
-
-(define background (rgb #xfaf8ef))
-
-(set-gl-clear-color (color-r background)
-                    (color-g background)
-                    (color-b background)
-                    (color-a background))
-
-(define tile-texture (load-texture "tile.png"))
-
-(define font (load-default-font 32))
-
-(define-record-type <tile>
-  (%make-tile background label)
-  tile?
-  (background tile-background)
-  (label tile-label))
-
-(define text-color-1 (rgb #x776e65))
-(define text-color-2 (rgb #xf9f6f2))
-
-(define tile-properties
-  `((0    . ((bg-color . ,(rgba #xeee4daaa))
-             (text-color . ,text-color-1)))
-    (2    . ((bg-color . ,(rgb #xeee4da))
-             (text-color . ,text-color-1)))
-    (4    . ((bg-color . ,(rgb #xede0c8))
-             (text-color . ,text-color-1)))
-    (8    . ((bg-color . ,(rgb #xf2b179))
-             (text-color . ,text-color-2)))
-    (16   . ((bg-color . ,(rgb #xf59563))
-             (text-color . ,text-color-2)))
-    (32   . ((bg-color . ,(rgb #xf67c5f))
-             (text-color . ,text-color-2)))
-    (64   . ((bg-color . ,(rgb #xf65e3b))
-             (text-color . ,text-color-2)))
-    (128  . ((bg-color . ,(rgb #xedcf72))
-             (text-color . ,text-color-2)))
-    (256  . ((bg-color . ,(rgb #xedcc61))
-             (text-color . ,text-color-2)))
-    (512  . ((bg-color . ,(rgb #xedc850))
-             (text-color . ,text-color-2)))
-    (1024 . ((bg-color . ,(rgb #xedc53f))
-             (text-color . ,text-color-2)))
-    (2048 . ((bg-color . ,(rgb #xedc22e))
-             (text-color . ,text-color-2)))))
-
-(define (tile-bg-color n)
-  (assoc-ref (assoc-ref tile-properties n) 'bg-color))
-
-(define (tile-text-color n)
-  (assoc-ref (assoc-ref tile-properties n) 'text-color))
-
-(define (make-tile x y n)
-  (let* ((w (texture-width tile-texture))
-         (h (texture-height tile-texture))
-         (background
-          (make-sprite tile-texture
-                       #:position (center
-                                   (vector2
-                                    (* x w)
-                                    (* y h)))
-                       #:color (tile-bg-color n)
-                       #:anchor null-vector2))
-         (label
-          (make-label font
-                      (if (zero? n) " " (number->string n))
-                      (center
-                       (vector2 (+ (* x w)
-                                   (/ w 2))
-                                (+ (* y h)
-                                   (/ h 2))))
-                      #:color (tile-text-color n)
-                      #:anchor 'center)))
-    (%make-tile background label)))
-
-(define (draw-tile tile)
-  (draw-sprite (tile-background tile))
-  (draw-label (tile-label tile)))
-
-(define window-width 640)
-(define window-height 480)
-(define board-width
-  (* board-size (texture-width tile-texture)))
-(define board-height
-  (* board-size (texture-height tile-texture)))
-(define center-pos
-  (vector2 (/ (- window-width board-width) 2)
-           (- window-height board-height 8)))
-
-(define (center v)
-  (v+ v center-pos))
-
-(define (enumerate-board board)
-  (enumerate (map (cut enumerate <>) board)))
-
-;; Transform board into a list of tile objects.
-(define-signal tiles
-  (signal-map
-   (lambda (board)
-     (flat-map
-      (lambda (row)
-        (let ((y (first row))
-              (row (second row)))
-          (map (lambda (cell)
-                 (let ((x (first cell))
-                       (n (second cell)))
-                   (make-tile x y n)))
-               row)))
-      (enumerate-board board)))
-   board))
-
-(define-signal status
-  (signal-map
-   (lambda (board)
-     (let ((message (cond ((board-lose? board) "GAME OVER")
-                          ((board-win? board) "YOU WIN!")
-                          (else ""))))
-       (make-label font message
-                   (center
-                    (vector2 (/ board-width 2)
-                             (/ board-height 2)))
-                   #:color black
-                   #:anchor 'bottom-center)))
-   board))
-
-(define play-again-font (load-default-font 16))
-
-(define-signal play-again-message
-  (signal-map
-   (lambda (board)
-     (make-label play-again-font
-                 (if (or (board-lose? board)
-                         (board-win? board))
-                     "Press N to play again"
-                     "")
-                 (center
-                  (vector2 (/ board-width 2)
-                           (/ board-height 2)))
-                 #:color black
-                 #:anchor 'top-center))
-   board))
-
-(define instruction-font (load-default-font 16))
-
-(define instructions
-  (make-label instruction-font
-              "Use the arrow keys to join the numbers and get to the 2048 tile!"
-              (vector2 (/ window-width 2) 0)
-              #:color text-color-1
-              #:anchor 'top-center))
-
-(define score-header-font (load-default-font 14))
-(define score-font (load-default-font 22))
-
-(define score-header
-  (make-label score-header-font
-              "SCORE"
-              (vector2 (+ (vx center-pos) (/ board-width 4)) 24)
-              #:color text-color-1
-              #:anchor 'top-center))
-
-(define-signal score
-  (signal-map
-   (lambda (state)
-     (make-label score-font
-                 (format #f "~d" (2048-score state))
-                 (vector2 (vx (label-position score-header))
-                          (+ (vy (label-position score-header)) 32))
-                 #:color text-color-1
-                 #:anchor 'center))
-   2048-state))
-
-(define best-score-header
-  (make-label score-header-font
-              "BEST"
-              (vector2 (+ (vx center-pos) (- board-width (/ board-width 4))) 24)
-              #:color text-color-1
-              #:anchor 'top-center))
-
-(define-signal best-score
-  (signal-map
-   (lambda (state)
-     (make-label score-font
-                 (format #f "~d" (2048-best-score state))
-                 (vector2 (vx (label-position best-score-header))
-                          (+ (vy (label-position best-score-header)) 32))
-                 #:color text-color-1
-                 #:anchor 'center))
-   2048-state))
-
-(define (render)
-  (for-each draw-tile (signal-ref tiles))
-  (draw-label instructions)
-  (draw-label score-header)
-  (draw-label best-score-header)
-  (draw-label (signal-ref score))
-  (draw-label (signal-ref best-score))
-  (draw-label (signal-ref status))
-  (draw-label (signal-ref play-again-message)))
-
-;;;
-;;; Initialization
-;;;
-
-(start-2d-repl)
-
-(add-hook! window-close-hook quit-game)
-(add-hook! draw-hook (lambda (dt alpha) (render)))
-
-(with-window (make-window #:title "2048")
-  (run-game-loop))
diff --git a/examples/guile-2048/guile-2048.scm b/examples/guile-2048/guile-2048.scm
new file mode 100755
index 0000000..d5ded0a
--- /dev/null
+++ b/examples/guile-2048/guile-2048.scm
@@ -0,0 +1,482 @@
+#! /usr/bin/env guile
+!#
+
+;;; guile-2048
+;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Clone of the official 2048 game at http://gabrielecirulli.github.io/2048/
+;;
+;;; Code:
+
+(use-modules (srfi srfi-1)
+             (srfi srfi-9)
+             (srfi srfi-11)
+             (srfi srfi-26)
+             (srfi srfi-42)
+             (ice-9 match)
+             (ice-9 rdelim)
+             (gl)
+             (2d audio)
+             (2d color)
+             (2d font)
+             (2d game)
+             (2d keyboard)
+             (2d rect)
+             (2d signal)
+             (2d sprite)
+             (2d texture)
+             (2d vector2)
+             (2d window)
+             (2d repl))
+;;;
+;;; Helpers
+;;;
+
+(define* (flat-map proc lst . rest)
+  (concatenate (apply map proc lst rest)))
+
+(define (enumerate lst)
+  (zip (iota (length lst)) lst))
+
+;;;
+;;; Game Board
+;;;
+
+(define board-size 4)
+
+(define (double x)
+  (* x 2))
+
+(define (strip-zeros lst)
+  (delete 0 lst))
+
+(define (pad-zeros lst size)
+  (append lst (make-list (max (- size (length lst)) 0) 0)))
+
+(define (merge lst)
+  (match lst
+    ((x x . rest)
+     (cons (double x) (merge rest)))
+    ((x . rest)
+     (cons x (merge rest)))
+    (_ '())))
+
+(define (points a b)
+  (define (iter a b p)
+    (cond ((or (null? a)
+               (null? b))
+           p)
+          ((= (car a) (car b))
+           (iter (cdr a) (cdr b) p))
+          (else
+           (iter (cddr a) (cdr b) (+ p (car b))))))
+  (iter a b 0))
+
+;; Merge list and accumulate points.
+(define (merge-row row)
+  (let* ((stripped (strip-zeros row))
+         (merged (merge stripped)))
+    (list (points stripped merged)
+          (pad-zeros merged board-size))))
+
+(define (transpose board)
+  (if (null? (car board))
+      '()
+      (cons (map car board)
+            (transpose (map cdr board)))))
+
+(define (board-shift-left board)
+  (map merge-row board))
+
+(define (board-shift-right board)
+  (map (lambda (row)
+         (let ((merged (merge-row (reverse row))))
+           (list (first merged) (reverse (second merged)))))
+       board))
+
+(define (board-shift-up board)
+  (let-values (((points board)
+                (unzip2 (board-shift-left (transpose board)))))
+    (zip points (transpose board))))
+
+(define (board-shift-down board)
+  (let-values (((points board)
+                (unzip2 (board-shift-right (transpose board)))))
+    (zip points (transpose board))))
+
+(define (board-shift board direction)
+  (match direction
+    ('up
+     (board-shift-up board))
+    ('down
+     (board-shift-down board))
+    ('left
+     (board-shift-left board))
+    ('right
+     (board-shift-right board))
+    (_ board)))
+
+(define (board-shift-and-accum-points board direction)
+  (let-values (((points board)
+                (unzip2 (board-shift board direction))))
+    (values (reduce + 0 points)
+            board)))
+
+(define (random-tile)
+  (list-ref '(2 4) (random 2)))
+
+;; So gross.
+(define (board-insert board)
+  (let ((x (random board-size))
+        (y (random board-size)))
+    (if (zero? (list-ref (list-ref board y) x))
+        (append (take board y)
+                (let ((rows (drop board y)))
+                  (cons (let ((cells (car rows)))
+                          (append (take cells x)
+                                  (let ((rest (drop cells x)))
+                                    (cons (random-tile)
+                                          (cdr rest)))))
+                        (cdr rows))))
+        (board-insert board))))
+
+(define (board-find board n)
+  (list?
+   (any (lambda (row)
+          (memq n row))
+        board)))
+
+(define (board-win? board)
+  (board-find (make-board) 2048))
+
+(define (board-lose? board)
+  (define (full? row)
+    (define (iter row prev)
+      (cond ((null? row)
+             #t)
+            ((or (zero? (car row))
+                 (= (car row) prev))
+             #f)
+            (else
+             (iter (cdr row) (car row)))))
+    (iter row 0))
+  (and (every full? board)
+       (every full? (transpose board))))
+
+(define null-board
+  '((0 0 0 0)
+    (0 0 0 0)
+    (0 0 0 0)
+    (0 0 0 0)))
+
+(define (make-board)
+  (board-insert (board-insert null-board)))
+
+;;;
+;;; Game State
+;;;
+
+(define save-file
+  (string-join (list (getenv "HOME") ".guile-2048")
+               file-name-separator-string))
+
+(define-record-type <2048>
+  (make-2048 board score best-score)
+  2048?
+  (board 2048-board)
+  (score 2048-score)
+  (best-score 2048-best-score))
+
+(define* (new-game #:optional (previous #f))
+  (let ((best-score (if previous
+                        (choose-best-score previous)
+                        (load-best-score))))
+    (make-2048 (make-board) 0 best-score)))
+
+(define (load-best-score)
+  (if (file-exists? save-file)
+      (with-input-from-file save-file
+        (lambda ()
+          (let ((score (string->number (read-string))))
+            (if (number? score) score 0))))
+      0))
+
+(define (save-best-score state)
+  (with-output-to-file save-file
+    (lambda ()
+      (format #t "~d" (choose-best-score state)))))
+
+(define (choose-best-score state)
+  (max (2048-score state) (2048-best-score state)))
+
+(define-signal controls
+  (signal-filter
+   (lambda (key)
+     (any (cut eq? key <>)
+          '(up down left right n)))
+   #f key-last-down))
+
+(define-signal 2048-state
+  (signal-fold
+   (lambda (key prev)
+     (if (eq? key 'n)
+         (new-game prev)
+         (let-values (((points new-board)
+                       (board-shift-and-accum-points (2048-board prev) key)))
+           (let ((score (+ (2048-score prev) points)))
+             ;; Only insert a new tile if there's room and the board
+             ;; was actually shifted.
+             (if (and (not (equal? (2048-board prev) new-board))
+                      (board-find new-board 0))
+                 (make-2048 (board-insert new-board) score
+                            (2048-best-score prev))
+                 (make-2048 new-board score (2048-best-score prev)))))))
+   (new-game)
+   controls))
+
+;; For convenience
+(define-signal board
+  (signal-map 2048-board 2048-state))
+
+(define-signal score-saver
+  (signal-tap (lambda (state)
+                (when (board-lose? (2048-board state))
+                  (save-best-score state)))
+              2048-state))
+
+;;;
+;;; Rendering
+;;;
+
+(open-window)
+(enable-sprites)
+(enable-fonts)
+(enable-audio)
+
+(define background (rgb #xfaf8ef))
+
+(set-gl-clear-color (color-r background)
+                    (color-g background)
+                    (color-b background)
+                    (color-a background))
+
+(define tile-texture (load-texture "tile.png"))
+
+(define font (load-default-font 32))
+
+(define-record-type <tile>
+  (%make-tile background label)
+  tile?
+  (background tile-background)
+  (label tile-label))
+
+(define text-color-1 (rgb #x776e65))
+(define text-color-2 (rgb #xf9f6f2))
+
+(define tile-properties
+  `((0    . ((bg-color . ,(rgba #xeee4daaa))
+             (text-color . ,text-color-1)))
+    (2    . ((bg-color . ,(rgb #xeee4da))
+             (text-color . ,text-color-1)))
+    (4    . ((bg-color . ,(rgb #xede0c8))
+             (text-color . ,text-color-1)))
+    (8    . ((bg-color . ,(rgb #xf2b179))
+             (text-color . ,text-color-2)))
+    (16   . ((bg-color . ,(rgb #xf59563))
+             (text-color . ,text-color-2)))
+    (32   . ((bg-color . ,(rgb #xf67c5f))
+             (text-color . ,text-color-2)))
+    (64   . ((bg-color . ,(rgb #xf65e3b))
+             (text-color . ,text-color-2)))
+    (128  . ((bg-color . ,(rgb #xedcf72))
+             (text-color . ,text-color-2)))
+    (256  . ((bg-color . ,(rgb #xedcc61))
+             (text-color . ,text-color-2)))
+    (512  . ((bg-color . ,(rgb #xedc850))
+             (text-color . ,text-color-2)))
+    (1024 . ((bg-color . ,(rgb #xedc53f))
+             (text-color . ,text-color-2)))
+    (2048 . ((bg-color . ,(rgb #xedc22e))
+             (text-color . ,text-color-2)))))
+
+(define (tile-bg-color n)
+  (assoc-ref (assoc-ref tile-properties n) 'bg-color))
+
+(define (tile-text-color n)
+  (assoc-ref (assoc-ref tile-properties n) 'text-color))
+
+(define (make-tile x y n)
+  (let* ((w (texture-width tile-texture))
+         (h (texture-height tile-texture))
+         (background
+          (make-sprite tile-texture
+                       #:position (center
+                                   (vector2
+                                    (* x w)
+                                    (* y h)))
+                       #:color (tile-bg-color n)
+                       #:anchor null-vector2))
+         (label
+          (make-label font
+                      (if (zero? n) " " (number->string n))
+                      (center
+                       (vector2 (+ (* x w)
+                                   (/ w 2))
+                                (+ (* y h)
+                                   (/ h 2))))
+                      #:color (tile-text-color n)
+                      #:anchor 'center)))
+    (%make-tile background label)))
+
+(define (draw-tile tile)
+  (draw-sprite (tile-background tile))
+  (draw-label (tile-label tile)))
+
+(define window-width 640)
+(define window-height 480)
+(define board-width
+  (* board-size (texture-width tile-texture)))
+(define board-height
+  (* board-size (texture-height tile-texture)))
+(define center-pos
+  (vector2 (/ (- window-width board-width) 2)
+           (- window-height board-height 8)))
+
+(define (center v)
+  (v+ v center-pos))
+
+(define (enumerate-board board)
+  (enumerate (map (cut enumerate <>) board)))
+
+;; Transform board into a list of tile objects.
+(define-signal tiles
+  (signal-map
+   (lambda (board)
+     (flat-map
+      (lambda (row)
+        (let ((y (first row))
+              (row (second row)))
+          (map (lambda (cell)
+                 (let ((x (first cell))
+                       (n (second cell)))
+                   (make-tile x y n)))
+               row)))
+      (enumerate-board board)))
+   board))
+
+(define-signal status
+  (signal-map
+   (lambda (board)
+     (let ((message (cond ((board-lose? board) "GAME OVER")
+                          ((board-win? board) "YOU WIN!")
+                          (else ""))))
+       (make-label font message
+                   (center
+                    (vector2 (/ board-width 2)
+                             (/ board-height 2)))
+                   #:color black
+                   #:anchor 'bottom-center)))
+   board))
+
+(define play-again-font (load-default-font 16))
+
+(define-signal play-again-message
+  (signal-map
+   (lambda (board)
+     (make-label play-again-font
+                 (if (or (board-lose? board)
+                         (board-win? board))
+                     "Press N to play again"
+                     "")
+                 (center
+                  (vector2 (/ board-width 2)
+                           (/ board-height 2)))
+                 #:color black
+                 #:anchor 'top-center))
+   board))
+
+(define instruction-font (load-default-font 16))
+
+(define instructions
+  (make-label instruction-font
+              "Use the arrow keys to join the numbers and get to the 2048 tile!"
+              (vector2 (/ window-width 2) 0)
+              #:color text-color-1
+              #:anchor 'top-center))
+
+(define score-header-font (load-default-font 14))
+(define score-font (load-default-font 22))
+
+(define score-header
+  (make-label score-header-font
+              "SCORE"
+              (vector2 (+ (vx center-pos) (/ board-width 4)) 24)
+              #:color text-color-1
+              #:anchor 'top-center))
+
+(define-signal score
+  (signal-map
+   (lambda (state)
+     (make-label score-font
+                 (format #f "~d" (2048-score state))
+                 (vector2 (vx (label-position score-header))
+                          (+ (vy (label-position score-header)) 32))
+                 #:color text-color-1
+                 #:anchor 'center))
+   2048-state))
+
+(define best-score-header
+  (make-label score-header-font
+              "BEST"
+              (vector2 (+ (vx center-pos) (- board-width (/ board-width 4))) 24)
+              #:color text-color-1
+              #:anchor 'top-center))
+
+(define-signal best-score
+  (signal-map
+   (lambda (state)
+     (make-label score-font
+                 (format #f "~d" (2048-best-score state))
+                 (vector2 (vx (label-position best-score-header))
+                          (+ (vy (label-position best-score-header)) 32))
+                 #:color text-color-1
+                 #:anchor 'center))
+   2048-state))
+
+(define (render)
+  (for-each draw-tile (signal-ref tiles))
+  (draw-label instructions)
+  (draw-label score-header)
+  (draw-label best-score-header)
+  (draw-label (signal-ref score))
+  (draw-label (signal-ref best-score))
+  (draw-label (signal-ref status))
+  (draw-label (signal-ref play-again-message)))
+
+;;;
+;;; Initialization
+;;;
+
+(start-2d-repl)
+
+(add-hook! window-close-hook quit-game)
+(add-hook! draw-hook (lambda (dt alpha) (render)))
+
+(with-window (make-window #:title "2048")
+  (run-game-loop))
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