h

twentyfortyeight/src/twentyfortyeight/Main.java

@@ -4,6 +4,7 @@ import java.awt.Color;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Random;
 import javalib.impworld.*;
 import javalib.worldimages.*;
 import tester.Tester;
@@ -11,10 +12,6 @@ import tester.Tester;
 class Examples {
     void testRun(Tester t) {
         Game game = new Game();
-        game.board.board.put(new Coord(0, 0), new Tile(2));
-        game.board.board.put(new Coord(3, 1), new Tile(20));
-        game.board.board.put(new Coord(3, 2), new Tile(200));
-        game.board.board.put(new Coord(2, 3), new Tile(2000));
         game.run();
     }
 }
@@ -64,23 +61,36 @@ class Game extends World {
         this.sz = Util.defaultWidth;
         this.width = this.sz * Util.scale;
         this.board = new Board(this.sz);
+        this.board.randGen();
+        this.board.randGen();
     }
 
     public WorldScene makeScene() {
         WorldScene scene = new WorldScene(this.width, this.width);
         scene.placeImageXY(this.board.draw(), this.width / 2, this.width / 2);
+        scene.placeImageXY(
+            new TextImage("Score: " + this.score, 20, Color.RED),
+            this.width / 2, 20
+        );
         return scene;
     }
 
     public void onKeyEvent(String key) {
         System.out.println("got key" + key);
-        if (key.equals("left") || key.equals("h")) this.board.move(Move.LEFT);
+
+        int score = 0;
+
+        if (key.equals("left") || key.equals("h"))
+            score = 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);
+            score = this.board.move(Move.DOWN);
+        else if (key.equals("up") || key.equals("k"))
+            score = this.board.move(Move.UP);
         else if (key.equals("right") || key.equals("l"))
-            this.board.move(Move.RIGHT);
+            score = this.board.move(Move.RIGHT);
         else return;
+
+        this.score += score;
     }
 
     void run() { this.bigBang(this.width, this.width, 0.01); }
@@ -90,10 +100,14 @@ class Game extends World {
 class Board {
     int sz; // The side length of the board grid square.
     Map<Coord, Cell> board;
+    Random rand;
+    boolean boardChanged;
 
     Board(int sz) {
         this.sz = sz;
         this.board = new HashMap<Coord, Cell>();
+        this.rand = new Random();
+        this.boardChanged = false;
     }
 
     // Draw the board.
@@ -130,9 +144,7 @@ class Board {
     }
 
     // Set the cell at the coords.
-    void set(Coord coord, Cell cell) {
-        this.board.put(coord, cell);
-    }
+    void set(Coord coord, Cell cell) { this.board.put(coord, cell); }
 
     // Try to move the cell at the coords to the coords.
     void tryCellMove(Coord coord, Coord dest) {
@@ -142,47 +154,123 @@ class Board {
         if (cell.isMoveable() && destCell.isReplaceable()) {
             this.set(dest, cell);
             this.set(coord, new Space());
+            boardChanged = true; // It did move.
         }
     }
 
-    // Move cell as much as possible.
-    void fullCellMove(Coord coord, Move move) {
+    // Try to combine two tiles if they have the same value
+    int tryCombine(Coord source, Coord target) {
+        Cell sourceCell = this.get(source);
+        Cell targetCell = this.get(target);
+
+        // Check if both cells are tiles.
+        if (sourceCell instanceof Tile && targetCell instanceof Tile) {
+            Tile sourceTile = (Tile)sourceCell;
+            Tile targetTile = (Tile)targetCell;
+
+            // Check they've the same n and haven't yet been combined.
+            if (sourceTile.n == targetTile.n && !targetTile.flag) {
+                Tile newTile = new Tile(sourceTile.n * 2);
+                int score = sourceTile.n;
+                newTile.flag = true;
+
+                this.set(target, newTile);
+                this.set(source, new Space());
+                boardChanged = true;
+                return score;
+            }
+        }
+        return 0;
+    }
+
+    // Move cell as much as possible. Return score.
+    int fullCellMove(Coord coord, Move move) {
         Cell cell = this.get(coord);
         Coord disp = Util.moveDisp(move);
 
-        if (!cell.isMoveable()) return;
+        if (!cell.isMoveable()) return 0;
 
-        for () {
-            this.tryCellMove(coord, coord.add(disp));
-        }
+        Coord current = coord;
+        Coord next = current.add(disp);
+
+        // Keep moving until edge or a non-replaceable cell hit.
+        while (next.x >= 0 && next.x < this.sz && next.y >= 0 &&
+               next.y < this.sz && this.get(next).isReplaceable()) {
+            this.tryCellMove(current, next);
+            current = next;
+            next = current.add(disp);
         }
 
-    // Move in the given direction.
-    void move(Move move) {
+        // Check if can combine next tile.
+        if (next.x >= 0 && next.x < this.sz && next.y >= 0 && next.y < this.sz)
+            return this.tryCombine(current, next);
+
+        // Only generate new tile if changed.
+        if (boardChanged) this.randGen();
+
+        return 0;
+    }
+
+    // Move in the given direction. Returns the generated score.
+    int move(Move move) {
         System.out.println("moving");
-        for (int i = 0; i < this.sz; i ++) {
-            this.moveLine(i, move);
+
+        // Reset flags for all tiles and change tracker.
+        resetFlags();
+
+        int score = 0;
+        for (int i = 0; i < this.sz; i++) { score += this.moveLine(i, move); }
+
+        return score;
+    }
+
+    // Reset flags of all tiles.
+    void resetFlags() {
+        for (int x = 0; x < this.sz; x++)
+            for (int y = 0; y < this.sz; y++) {
+                Cell cell = this.get(new Coord(x, y));
+                if (cell instanceof Tile) ((Tile)cell).flag = false;
             }
     }
 
     // Move a line of tiles.
-    void moveLine(int i, Move move) {
-        if (move.equals(Move.LEFT)) {
-            for (int x = 1; x < this.sz; x++) {
-                this.fullCellMove(new Coord(x, i), move);
-            }
+    int moveLine(int i, Move move) {
+        int score = 0;
+        if (move.equals(Move.LEFT))
+            for (int x = 1; x < this.sz; x++)
+                score += this.fullCellMove(new Coord(x, i), move);
+
+        else if (move.equals(Move.RIGHT))
+            for (int x = this.sz - 2; x >= 0; x--)
+                score += this.fullCellMove(new Coord(x, i), move);
+
+        else if (move.equals(Move.DOWN))
+            for (int y = this.sz - 2; y >= 0; y--)
+                score += this.fullCellMove(new Coord(i, y), move);
+
+        else if (move.equals(Move.UP))
+            for (int y = 1; y < this.sz; y++)
+                score += this.fullCellMove(new Coord(i, y), move);
+
+        return score;
     }
 
-        else if (move.equals(Move.RIGHT)) {
-            for (int x = this.sz - 2; x >= 0; x--) {
-                this.fullCellMove(new Coord(x, i), move);
-            }
+    // Adds new tile (2 @ 80% chance, or 4 @ 20%) to random empty space on
+    // board.
+    void randGen() {
+        ArrayList<Coord> emptySpaces = new ArrayList<>();
+
+        for (int x = 0; x < this.sz; x++)
+            for (int y = 0; y < this.sz; y++) {
+                Coord coord = new Coord(x, y);
+                if (this.get(coord).isReplaceable()) emptySpaces.add(coord);
             }
 
-        else if (move.equals(Move.DOWN)) {
-            for (int y = this.sz - 2; y > 0; y--) {
-                this.tryCellMove(new Coord(i, y), new Coord(i , y + 1));
-            }
+        if (!emptySpaces.isEmpty()) {
+            Coord chosenSpace =
+                emptySpaces.get(rand.nextInt(emptySpaces.size()));
+            int value = rand.nextDouble() < 0.8 ? 2 : 4;
+            this.set(chosenSpace, new Tile(value));
         }
     }
 }
@@ -204,14 +292,18 @@ abstract class Cell {
 
     // Is this moveable?
     boolean isMoveable() { return false; }
-    boolean isReplaceable() { return false;}
+    boolean isReplaceable() { return false; }
 }
 
 // A moveable tile on the board.
 class Tile extends Cell {
     int n;
+    boolean flag;
 
-    Tile(int n) { this.n = n; }
+    Tile(int n) {
+        this.n = n;
+        this.flag = false;
+    }
 
     Color col() {
         int r = (int)Math.min(255, 20 * (int)(Math.log(this.n) / Math.log(2)));
@@ -227,8 +319,8 @@ class Tile extends Cell {
         );
     }
 
-    boolean isMoveable() { return true;}
-    boolean isReplaceable() {return false;}
+    boolean isMoveable() { return true; }
+    boolean isReplaceable() { return false; }
 }
 
 // An empty space on the board.