too late.

twentyfortyeight/src/twentyfortyeight/Main.java

@@ -15,6 +15,8 @@ class Examples {
         Game game = new Game();
         game.board.board.put(new Coord(0, 0), new Tile(2));
         game.board.board.put(new Coord(0, 1), new Tile(20));
+        game.board.board.put(new Coord(0, 2), new Tile(200));
+        game.board.board.put(new Coord(0, 3), new Tile(2000));
         game.run();
     }
 }
@@ -22,10 +24,25 @@ class Examples {
 // Config constants.
 class Util {
     // Game scale.
-    static int scale = 70;
+    static int scale = 256;
 
     // Default 2048 game board width.
     static int defaultWidth = 4;
+
+    // Calculate an appropriate font size for a number.
+    static double fontSize(int n) {
+        // Start scaling numbers down once they pass 2 digits.
+        double x = 0.73 * Math.pow(Math.ceil(Math.log(n) / Math.log(100)), -1);
+        return Util.scale * x;
+    }
+
+    // Convert a movement to a displacement vector.
+    Coord moveDisp(Move move) {
+        if (move.equals(Move.LEFT)) return new Coord(-1, 0);
+        else if (move.equals(Move.DOWN)) return new Coord(0, -1);
+        else if (move.equals(Move.UP)) return new Coord(0, 1);
+        else return new Coord(0, 1);
+    }
 }
 
 // A game of 2048.
@@ -56,9 +73,22 @@ class Game extends World {
         return scene;
     }
 
+    public void onKeyEvent(String key) {
+        if (key.equals("left") || key.equals("h")) this.board.move(Move.LEFT);
+        else if (key.equals("down") || key.equals("j"))
+            this.board.move(Move.DOWN);
+        else if (key.equals("up") || key.equals("k")) this.board.move(Move.UP);
+        else if (key.equals("right") || key.equals("l"))
+            this.board.move(Move.RIGHT);
+        else return;
+    }
+
     void run() { this.bigBang(this.width, this.width); }
 }
 
+// The possible movements.
+enum Move { UP, LEFT, RIGHT, DOWN }
+
 // The board on which the game is played.
 class Board {
     int sz; // The side length of the board grid square.
@@ -93,6 +123,7 @@ class Board {
         );
     }
 
+    // Get the cell at the coords.
     Cell get(Coord coord) {
         Cell gotten = this.board.get(coord);
 
@@ -100,6 +131,16 @@ class Board {
         if (gotten == null) return new Space();
         else return gotten;
     }
+
+    // Move in the given direction.
+    void move(Move move) {
+        for (int x = 0; x < this.sz; x++) {
+            for (int y = 0; y < this.sz; y++) {
+                // Copy logic from old code here.
+                Cell cell = this.get(new Coord(x, y));
+            }
+        }
+    }
 }
 
 // A cell on the board.
@@ -122,18 +163,14 @@ class Tile extends Cell {
     Tile(int n) { this.n = n; }
 
     Color col() {
-        // int r = (int)Math.min(255, 20 * (int)(Math.log(this.n) /
-        // Math.log(2))); return new Color(r, r / 2 + 80, r / 3 + 20);
-        return Color.RED;
+        int r = (int)Math.min(255, 20 * (int)(Math.log(this.n) / Math.log(2)));
+        return new Color(r, r / 2 + 80, r / 3 + 20);
     }
 
     WorldImage draw() {
         return new OverlayImage(
             new TextImage(
-                String.valueOf(this.n),
-                (Util.scale / Math.ceil((Math.log(this.n) / Math.log(10)))) *
-                    0.7,
-                Color.BLACK
+                String.valueOf(this.n), Util.fontSize(this.n), Color.BLACK
             ),
             super.draw()
         );
@@ -142,7 +179,7 @@ class Tile extends Cell {
 
 // An empty space on the board.
 class Space extends Cell {
-    Color col() { return Color.BLUE; }
+    Color col() { return Color.LIGHT_GRAY; }
 }
 
 // Board coordinates.
@@ -154,6 +191,10 @@ class Coord {
         this.y = y;
     }
 
+    Coord add(Coord that) { return that.addHelper(this.x, this.y); }
+
+    Coord addHelper(int x, int y) { return new Coord(this.x + x, this.y + y); }
+
     public boolean equals(Object that) {
         if (!(that instanceof Coord)) return false;
         else return ((Coord)that).x == this.x && ((Coord)that).y == this.y;