WHat;

twentyfortyeight/src/twentyfortyeight/Main.java

@@ -71,7 +71,10 @@ class Game extends World {
         this.scene = new WorldScene(this.grid.w, this.grid.h);
     }
 
-    void launchGame() { this.bigBang(this.w, this.h, 0.01); }
+    void launchGame() {
+        this.bigBang(this.w, this.h, 0.01);
+        this.grid.set(0, 0, 2).set(0, 2, 2);
+    }
 
     public WorldScene makeScene() {
         this.scene = this.getEmptyScene();
@@ -84,7 +87,16 @@ class Game extends World {
         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);
-        else return; // Don't draw if bad key pressed.
+        else return; // Don't draw or add tiles if bad key pressed.
+
+        this.draw();
+
+        List<Integer> frees = this.grid.freeCellIdxs();
+        // Add tiles
+        this.grid.buf.set(
+            frees.get(0), 2 // this.rand.nextInt() % (frees.size() - 1)), 2
+        );
+
         this.draw();
     }
 
@@ -173,13 +185,46 @@ class Grid {
     void combine(int d) {
         // Assume left.
         if (d == 0) {
-            for (int i = 0; i < this.h; i++) {
-                int prv = this.get(0, i);
-                for (int j = 1; j < this.w; j++) {
-                    int cur = this.get(j, i);
+            for (int y = 0; y < this.h; y++) {
+                int prv = this.get(0, y);
+                for (int x = 1; x < this.w; x++) {
+                    int cur = this.get(x, y);
                     if (cur == prv) {
-                        this.set(j - 1, i, cur * 2);
-                        this.set(j, i, 0);
+                        this.set(x - 1, y, cur * 2);
+                        this.set(x, y, 0);
+                    }
+                }
+            }
+        } else if (d == 1) {
+            for (int x = 0; x < this.w; x++) {
+                int prv = this.get(x, this.h - 1);
+                for (int y = this.h - 2; y > 0; y--) {
+                    int cur = this.get(x, y);
+                    if (cur == prv) {
+                        this.set(x, y + 1, cur * 2);
+                        this.set(x, y, 0);
+                    }
+                }
+            }
+        } else if (d == 2) {
+            for (int x = 0; x < this.w; x++) {
+                int prv = this.get(x, 0);
+                for (int y = 1; y < this.h; y++) {
+                    int cur = this.get(x, y);
+                    if (cur == prv) {
+                        this.set(x, y - 1, cur * 2);
+                        this.set(x, y, 0);
+                    }
+                }
+            }
+        } else if (d == 3) {
+            for (int y = 0; y < this.h; y++) {
+                int prv = this.get(this.w - 1, y);
+                for (int x = this.w - 2; x > 0; x--) {
+                    int cur = this.get(x, y);
+                    if (cur == prv) {
+                        this.set(x + 1, y, cur * 2);
+                        this.set(x, y, 0);
                     }
                 }
             }
@@ -226,6 +271,7 @@ class Grid {
     void mv(int d) {
         while (this.partMv(d)); // I love side effects :).
         this.combine(d);
+        // while (this.partMv(d)); // Complete move.
     }
 
     // Render the grid.
@@ -294,7 +340,6 @@ class Examples {
 
     void testGame(Tester t) {
         game = new Game();
-        game.grid.set(0, 0, 2).set(2, 0, 2);
 
         game.launchGame();
     }