From fc258d5caefb896c2790e91849963bab729ad3c1 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sat, 6 Dec 2014 13:18:16 -0500
Subject: examples: Update 2048.

* examples/2048/2048: Delete.
* examples/2048/2048.scm: New file.
* examples/Makefile.am (examples_DATA): Add new file.  Remove old one.
---
 examples/2048/2048     | 462 -------------------------------------------------
 examples/2048/2048.scm | 457 ++++++++++++++++++++++++++++++++++++++++++++++++
 examples/Makefile.am   |   2 +-
 3 files changed, 458 insertions(+), 463 deletions(-)
 delete mode 100755 examples/2048/2048
 create mode 100755 examples/2048/2048.scm

(limited to 'examples')

diff --git a/examples/2048/2048 b/examples/2048/2048
deleted file mode 100755
index 8d0c134..0000000
--- a/examples/2048/2048
+++ /dev/null
@@ -1,462 +0,0 @@
-#! /usr/bin/env guile
-!#
-
-;;; 2048
-;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
-;;; Copyright (C) 2014 Jordan Russell <jordan.likes.curry@gmail.com>
-;;;
-;;; 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)
-             (ice-9 match)
-             (sly utils)
-             (sly math)
-             (sly math rect)
-             (sly math transform)
-             (sly math tween)
-             (sly math vector)
-             (sly render camera)
-             (sly render color)
-             (sly render context)
-             (sly render font)
-             (sly render group)
-             (sly render model)
-             (sly render sprite)
-             (sly render texture)
-             (sly input keyboard)
-             (sly game)
-             (sly signal)
-             (sly window)
-             (sly audio)
-             (sly repl))
-
-(set! *random-state* (random-state-from-platform))
-
-;;;
-;;; Helpers
-;;;
-
-(define (enumerate lst)
-  (zip (iota (length lst)) lst))
-
-(define (replace-at lst idx item)
-  (let-values (((f d)
-                (split-at lst idx)))
-    (append f (cons item (cdr d)))))
-
-;;;
-;;; 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
-  (match-lambda
-    ((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-down board)
-  (let-values (((points board)
-                (unzip2 (board-shift-left (transpose board)))))
-    (zip points (transpose board))))
-
-(define (board-shift-up 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)))
-
-(define (board-insert board)
-  (let ((x (random board-size))
-        (y (random board-size)))
-    (let-values (((f d)
-                  (split-at (list-ref board y) x)))
-      (if (zero? (car d))
-          (replace-at board y
-                   (append f (cons (random-tile) (cdr d))))
-          (board-insert board)))))
-
-(define (board-find board n)
-  (list?
-   (any (lambda (row)
-          (memq n row))
-        board)))
-
-(define (board-win? board)
-  (board-find 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-append (getenv "HOME") "/.guile-2048"))
-
-(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 (read)))
-            (if (number? score) score 0))))
-      0))
-
-(define (save-best-score state)
-  (with-output-to-file save-file
-    (lambda ()
-      (write (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-fonts)
-(enable-audio)
-
-(define background (rgb #xfaf8ef))
-
-(define tile-texture (load-texture "tile.png"))
-
-(define font (load-default-font 32))
-
-(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 tile-sprite (make-sprite tile-texture #:anchor (vector2 0 0)))
-
-(define tile-label-cache
-  (map (lambda (n)
-         (cons n (label font (number->string n) #:anchor 'center)))
-       '(2 4 8 16 32 64 128 256 512 1024 2048)))
-
-(define (make-tile x y n)
-  (let* ((w (texture-width tile-texture))
-         (h (texture-height tile-texture))
-         (label (assoc-ref tile-label-cache n))
-         (label-color (tile-text-color n))
-         (bg-color (tile-bg-color n)))
-    (group-move (vector2 (* x w) (* y h))
-                (make-group
-                 (cons (model-paint bg-color tile-sprite)
-                       (if (zero? n)
-                           '()
-                           (list (group-move (vector2 (/ w 2) (/ h 2))
-                                             (group (model-paint label-color
-                                                                 label))))))))))
-
-(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) 8))
-
-(define (enumerate-board board)
-  (enumerate (map (cut enumerate <>) board)))
-
-(define-signal tiles
-  (signal-map (lambda (board)
-                (make-group
-                 (append-map
-                  (match-lambda
-                   ((y (row ...))
-                    (map (match-lambda
-                          ((x n)
-                           (make-tile x y n)))
-                         row)))
-                  (enumerate-board board))))
-              board))
-
-(define play-again-font (load-default-font 16))
-
-(define-signal status-message
-  (let ((play-again (model-paint black (label play-again-font
-                                              "Press N to play again"
-                                              #:anchor 'top-center)))
-        (game-over (model-paint black (label font "GAME OVER"
-                                             #:anchor 'bottom-center)))
-        (you-win (model-paint black (label font "YOU WIN!"
-                                           #:anchor 'bottom-center))))
-    (signal-map
-           (lambda (board)
-             (let ((message (cond
-                             ((board-lose? board) game-over)
-                             ((board-win? board) you-win)
-                             (else #f))))
-               (group-move (vector2 (/ board-width 2)
-                                    (/ board-height 2))
-                           (make-group (if message
-                                           (list message play-again)
-                                           '())))))
-           board)))
-
-(define instruction-font (load-default-font 16))
-
-(define instruction-text
-  "Use the arrow keys to join the numbers and get to the 2048 tile!")
-
-(define-signal instructions
-  (group-move (vector2 (/ board-width 2) (- window-height (vy center-pos)))
-              (group
-               (model-paint text-color-1
-                            (label instruction-font instruction-text
-                                   #:anchor 'top-center)))))
-
-(define score-header-font (load-default-font 14))
-(define score-font (load-default-font 22))
-
-(define (score-label text score x)
-  (let* ((duration 15)
-         (position-tween (let* ((to (vector2 0 -32))
-                                (from (v- to (vector2 0 -8))))
-                           (tween vlerp ease-linear from to duration)))
-         (color-tween (tween color-lerp ease-linear
-                             transparent text-color-1 duration))
-         (score (signal-drop-repeats score))
-         (header (label score-header-font text #:anchor 'top-center)))
-    (signal-map (lambda (score timer)
-                  (let ((score (label score-font (number->string score)
-                                      #:anchor 'center)))
-                    (group-move (vector2 x (- window-height 28))
-                                (group
-                                 (model-paint text-color-1 header)
-                                 (group-move (position-tween timer)
-                                             (group
-                                              (model-paint (color-tween timer)
-                                                           score)))))))
-                score
-                (signal-drop (lambda (t) (> t duration))
-                             0 (signal-since 1 score)))))
-
-(define-signal score
-  (score-label "SCORE" (signal-map 2048-score 2048-state) (/ board-width 4)))
-
-(define-signal best-score
-  (score-label "BEST" (signal-map 2048-best-score 2048-state)
-               (- board-width (/ board-width 4))))
-
-(define-signal 2048-scene
-  (signal-map (cut group-move center-pos <>)
-              (signal-map group instructions tiles score
-                          best-score status-message)))
-
-(define camera
-  (orthographic-camera window-width window-height
-                       #:viewport (make-viewport (make-rect 0 0 640 480)
-                                                 #:clear-color background)))
-
-(define draw-2048
-  (let ((context (make-render-context)))
-    (lambda (dt alpha)
-      (signal-let ((scene 2048-scene))
-        (draw-group scene camera context)))))
-
-;;;
-;;; Initialization
-;;;
-
-(start-sly-repl)
-
-(add-hook! window-close-hook stop-game-loop)
-(add-hook! draw-hook (trampoline draw-2048))
-
-(with-window (make-window #:title "2048")
-  (start-game-loop))
-
-;;; Local Variables:
-;;; compile-command: "../../pre-inst-env guile 2048"
-;;; End:
diff --git a/examples/2048/2048.scm b/examples/2048/2048.scm
new file mode 100755
index 0000000..73cb5f6
--- /dev/null
+++ b/examples/2048/2048.scm
@@ -0,0 +1,457 @@
+;;; 2048
+;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
+;;; Copyright (C) 2014 Jordan Russell <jordan.likes.curry@gmail.com>
+;;;
+;;; 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)
+             (ice-9 match)
+             (sly utils)
+             (sly math)
+             (sly math rect)
+             (sly math transform)
+             (sly math tween)
+             (sly math vector)
+             (sly render camera)
+             (sly render color)
+             (sly render context)
+             (sly render font)
+             (sly render group)
+             (sly render model)
+             (sly render sprite)
+             (sly render texture)
+             (sly input keyboard)
+             (sly game)
+             (sly signal)
+             (sly window)
+             (sly audio)
+             (sly repl))
+
+(set! *random-state* (random-state-from-platform))
+
+;;;
+;;; Helpers
+;;;
+
+(define (enumerate lst)
+  (zip (iota (length lst)) lst))
+
+(define (replace-at lst idx item)
+  (let-values (((f d)
+                (split-at lst idx)))
+    (append f (cons item (cdr d)))))
+
+;;;
+;;; 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
+  (match-lambda
+    ((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-down board)
+  (let-values (((points board)
+                (unzip2 (board-shift-left (transpose board)))))
+    (zip points (transpose board))))
+
+(define (board-shift-up 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)))
+
+(define (board-insert board)
+  (let ((x (random board-size))
+        (y (random board-size)))
+    (let-values (((f d)
+                  (split-at (list-ref board y) x)))
+      (if (zero? (car d))
+          (replace-at board y
+                   (append f (cons (random-tile) (cdr d))))
+          (board-insert board)))))
+
+(define (board-find board n)
+  (list?
+   (any (lambda (row)
+          (memq n row))
+        board)))
+
+(define (board-win? board)
+  (board-find 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-append (getenv "HOME") "/.guile-2048"))
+
+(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 (read)))
+            (if (number? score) score 0))))
+      0))
+
+(define (save-best-score state)
+  (with-output-to-file save-file
+    (lambda ()
+      (write (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-fonts)
+(enable-audio)
+
+(define background (rgb #xfaf8ef))
+
+(define tile-texture (load-texture "tile.png"))
+
+(define font (load-default-font 32))
+
+(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 tile-sprite (make-sprite tile-texture #:anchor (vector2 0 0)))
+
+(define tile-label-cache
+  (map (lambda (n)
+         (cons n (label font (number->string n) #:anchor 'center)))
+       '(2 4 8 16 32 64 128 256 512 1024 2048)))
+
+(define (make-tile x y n)
+  (let* ((w (texture-width tile-texture))
+         (h (texture-height tile-texture))
+         (label (assoc-ref tile-label-cache n))
+         (label-color (tile-text-color n))
+         (bg-color (tile-bg-color n)))
+    (group-move (vector2 (* x w) (* y h))
+                (make-group
+                 (cons (model-paint bg-color tile-sprite)
+                       (if (zero? n)
+                           '()
+                           (list (group-move (vector2 (/ w 2) (/ h 2))
+                                             (group (model-paint label-color
+                                                                 label))))))))))
+
+(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) 8))
+
+(define (enumerate-board board)
+  (enumerate (map (cut enumerate <>) board)))
+
+(define-signal tiles
+  (signal-map (lambda (board)
+                (make-group
+                 (append-map
+                  (match-lambda
+                   ((y (row ...))
+                    (map (match-lambda
+                          ((x n)
+                           (make-tile x y n)))
+                         row)))
+                  (enumerate-board board))))
+              board))
+
+(define play-again-font (load-default-font 16))
+
+(define-signal status-message
+  (let ((play-again (model-paint black (label play-again-font
+                                              "Press N to play again"
+                                              #:anchor 'top-center)))
+        (game-over (model-paint black (label font "GAME OVER"
+                                             #:anchor 'bottom-center)))
+        (you-win (model-paint black (label font "YOU WIN!"
+                                           #:anchor 'bottom-center))))
+    (signal-map
+           (lambda (board)
+             (let ((message (cond
+                             ((board-lose? board) game-over)
+                             ((board-win? board) you-win)
+                             (else #f))))
+               (group-move (vector2 (/ board-width 2)
+                                    (/ board-height 2))
+                           (make-group (if message
+                                           (list message play-again)
+                                           '())))))
+           board)))
+
+(define instruction-font (load-default-font 16))
+
+(define instruction-text
+  "Use the arrow keys to join the numbers and get to the 2048 tile!")
+
+(define-signal instructions
+  (group-move (vector2 (/ board-width 2) (- window-height (vy center-pos)))
+              (group
+               (model-paint text-color-1
+                            (label instruction-font instruction-text
+                                   #:anchor 'top-center)))))
+
+(define score-header-font (load-default-font 14))
+(define score-font (load-default-font 22))
+
+(define (score-label text score x)
+  (let* ((duration 15)
+         (position-tween (let* ((to (vector2 0 -32))
+                                (from (v- to (vector2 0 -8))))
+                           (tween vlerp ease-linear from to duration)))
+         (color-tween (tween color-lerp ease-linear
+                             transparent text-color-1 duration))
+         (score (signal-drop-repeats score))
+         (header (label score-header-font text #:anchor 'top-center)))
+    (signal-map (lambda (score timer)
+                  (let ((score (label score-font (number->string score)
+                                      #:anchor 'center)))
+                    (group-move (vector2 x (- window-height 28))
+                                (group
+                                 (model-paint text-color-1 header)
+                                 (group-move (position-tween timer)
+                                             (group
+                                              (model-paint (color-tween timer)
+                                                           score)))))))
+                score
+                (signal-drop (lambda (t) (> t duration))
+                             0 (signal-since 1 score)))))
+
+(define-signal score
+  (score-label "SCORE" (signal-map 2048-score 2048-state) (/ board-width 4)))
+
+(define-signal best-score
+  (score-label "BEST" (signal-map 2048-best-score 2048-state)
+               (- board-width (/ board-width 4))))
+
+(define-signal 2048-scene
+  (signal-map (cut group-move center-pos <>)
+              (signal-map group instructions tiles score
+                          best-score status-message)))
+
+(define camera
+  (orthographic-camera window-width window-height
+                       #:viewport (make-viewport (make-rect 0 0 640 480)
+                                                 #:clear-color background)))
+
+(define (draw-2048 dt alpha)
+  (signal-let ((scene 2048-scene))
+    (draw-group scene camera)))
+
+;;;
+;;; Initialization
+;;;
+
+(start-sly-repl)
+
+(add-hook! window-close-hook stop-game-loop)
+(add-hook! draw-hook (trampoline draw-2048))
+
+(with-window (make-window #:title "2048")
+  (start-game-loop))
+
+;;; Local Variables:
+;;; compile-command: "../../pre-inst-env guile 2048.scm"
+;;; End:
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 0ad17ff..46c9106 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -23,7 +23,7 @@ examples_DATA =					\
 	joystick.scm				\
 	simple.scm				\
 	tilemap.scm				\
-	2048/2048				\
+	2048/2048.scm				\
 	mines/mines.scm
 
 imagedir = $(pkgdatadir)/examples/images
-- 
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