Finished twentyfortyeight.

twentyfortyeight/src/twentyfortyeight/Main.java

@@ -1,6 +1,7 @@
 package twentyfortyeight;
 
 import java.awt.Color;
+import java.time.format.TextStyle;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
@@ -77,12 +78,15 @@ class Game extends World {
     }
 
     public void onKeyEvent(String key) {
-        if (key.equals("left") || key.equals("h")) this.grid.mv(0);
-        else if (key.equals("down") || key.equals("j")) this.grid.mv(1);
-        else if (key.equals("up") || key.equals("k")) this.grid.mv(2);
-        else if (key.equals("right") || key.equals("l")) this.grid.mv(3);
+        int mv;
+        if (key.equals("left") || key.equals("h")) mv = 0;
+        else if (key.equals("down") || key.equals("j")) mv = 1;
+        else if (key.equals("up") || key.equals("k")) mv = 2;
+        else if (key.equals("right") || key.equals("l")) mv = 3;
         else return; // Don't draw or add tiles if bad key pressed.
 
+        this.score += this.grid.mv(mv);
+
         this.draw();
 
         List<Integer> frees = this.grid.freeCellIdxs();
@@ -93,7 +97,16 @@ class Game extends World {
     }
 
     // Draw current game state.
-    void draw() { this.scene = this.grid.render(); }
+    void draw() {
+        this.scene = this.grid.render();
+
+        this.scene.placeImageXY(
+            new TextImage(
+                "Score: " + String.valueOf(this.score), 25, Color.red
+            ),
+            100, 20
+        );
+    }
 }
 
 // The grid in which the game is played.
@@ -126,18 +139,6 @@ class Grid {
         return free;
     }
 
-    // Get the indexes of all "unfree" cells -- those whose value in buf is not
-    // 0, and represent a used tile.
-    /*
-    List<Integer> unfreeCellIdxs() {
-        List<Integer> unfree = new ArrayList<>();
-        for (int i = 0; i < this.sz; i++)
-            if (this.buf.get(i) != 0 && unfree.add(i)) continue;
-
-        return unfree;
-    }
-    */
-
     // Set the tile at the coords.
     Grid set(int x, int y, int v) {
         this.buf.set(this.where(x, y), v);
@@ -156,13 +157,16 @@ class Grid {
     // Get the y coord for an index.
     int iy(int i) { return i % this.w; }
 
-    void mv(int d) {
+    int mv(int d) {
+        int add = 0;
         // For each row / col.
         for (int i = 0; i < (d % 3 == 0 ? this.h : this.w); i++) {
             while (this.lnMv(i, d));
-            this.squish(i, d);
+            add += this.squish(i, d);
             while (this.lnMv(i, d));
         }
+
+        return add;
     }
 
     // Get the ith row.
@@ -222,14 +226,18 @@ class Grid {
     }
 
     // Squish like tiles together.
-    void squish(int i, int d) {
+    int squish(int i, int d) {
+        int add = 0;
         List<Integer> ln = getLn(i, d);
         for (int j = 0; j < ln.size() - 1; j++) {
             if (ln.get(j) != 0 && ln.get(j) == ln.get(j + 1)) {
                 ln.set(j, 2 * ln.get(j));
                 ln.set(j + 1, 0);
+                add += ln.get(j);
             }
         }
+
+        return add;
     }
 
     // Render the grid.
@@ -297,7 +305,7 @@ class Examples {
     }
 
     void testGame(Tester t) {
-        game = new Game(2, 2);
+        game = new Game(4, 4);
         game.launchGame();
     }
 }