package Game2048;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
public class Game2048 extends JPanel {
enum State {
start, won, running, over
}
final Color[] colorTable = { new Color(0x701710), new Color(0xFFE4C3), new Color(0xfff4d3), new Color(0xffdac3),
new Color(0xe7b08e), new Color(0xe7bf8e), new Color(0xffc4c3), new Color(0xE7948e), new Color(0xbe7e56),
new Color(0xbe5e56), new Color(0x9c3931), new Color(0x701710) };// 目标分数值
final static int target = 2048;
static int highest;
static int score;
// 方格颜色、空颜色、开始颜色
private Color gridColor = new Color(0xBBADA0);
private Color emptyColor = new Color(0xCDC1B4);
private Color startColor = new Color(0xFFEBCD);
// 生成随机数
private Random rand = new Random();
//数字块数组，存放全部数字块
private Tile[][] tiles;
//生成4x4的方格界面
private int side = 4;
//游戏状态：开始
private State gamestate = State.start;
//判断能否发生移动
private boolean checkingAvailableMoves;
public Game2048() {
//设定游戏窗体宽和高900x700
setPreferredSize(new Dimension(900, 700));
//窗体的背景颜色
setBackground(new Color(0xFAF8EF));
setFont(new Font("SansSerif", Font.BOLD, 48));
setFocusable(true);
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
startGame();
repaint();
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_UP:
moveUp();
break;
case KeyEvent.VK_DOWN:
moveDown();
break;
case KeyEvent.VK_LEFT:
moveLeft();
break;
case KeyEvent.VK_RIGHT:
moveRight();
break;
}
repaint();
}
});
}
//初始化画图
@Override
public void paintComponent(Graphics gg) {
super.paintComponent(gg);
Graphics2D g = (Graphics2D) gg;
//抗锯齿
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
drawGrid(g);
}
//开始游戏
void startGame() {
if (gamestate != State.running) {
score = 0;
highest = 0;
gamestate = State.running;
//给数字块数组分配空间
tiles = new Tile[side][side];
//随机生成两个数字块
addRandomTile();
addRandomTile();
}
}
void drawGrid(Graphics2D g) {
g.setColor(gridColor);
g.fillRoundRect(200, 100, 499, 499, 15, 15);
if (gamestate == State.running) {
for (int r = 0; r < side; r++) {
for (int c = 0; c < side; c++) {
if (tiles[r][c] == null) {
g.setColor(emptyColor);
g.fillRoundRect(215 + c * 121, 115 + r * 121, 106, 106, 7, 7);
} else {
drawTile(g, r, c);
}
}
}
} else {
g.setColor(startColor);
g.fillRoundRect(215, 115, 469, 469, 7, 7);
g.setColor(gridColor.darker());
g.setFont(new Font("SansSerif", Font.BOLD, 128));
g.drawString("2048", 310, 270);
g.setFont(new Font("SansSerif", Font.BOLD, 20));
if (gamestate == State.won) {
g.drawString("you made it!", 390, 350);
} else if (gamestate == State.over)
g.drawString("game over", 400, 350);
g.setColor(gridColor);
g.drawString("click to start a new game", 330, 470);
g.drawString("(use arrow keys to move tiles)", 310, 530);
}
}
void drawTile(Graphics2D g, int r, int c) {
int value = tiles[r][c].getValue();
g.setColor(colorTable[(int) (Math.log(value) / Math.log(2)) + 1]);
g.fillRoundRect(215 + c * 121, 115 + r * 121, 106, 106, 7, 7);
String s = String.valueOf(value);
g.setColor(value < 128 ? colorTable[0] : colorTable[1]);
FontMetrics fm = g.getFontMetrics();
//字体最高基准和最低基准
int asc = fm.getAscent();
int dec = fm.getDescent();
int x = 215 + c * 121 + (106 - fm.stringWidth(s)) / 2;
int y = 115 + r * 121 + (asc + (106 - (asc + dec)) / 2);
g.drawString(s, x, y);
}
//生成随机数的方法
private void addRandomTile() {
int pos = rand.nextInt(side * side);
//行和列
int row, col;
do {
//给4*4的方块分配地址值
pos = (pos + 1) % (side * side);
row = pos / side;
col = pos % side;
//只有没有数字的方块才能生成随机数
} while (tiles[row][col] != null);
int val = rand.nextInt(10) == 0 ? 4 : 2;
tiles[row][col] = new Tile(val);
}
private boolean move(int countDownFrom, int yIncr, int xIncr) {
boolean moved = false;
//遍历16个数字块
for (int i = 0; i < side * side; i++) {
int j = Math.abs(countDownFrom - i);
int r = j / side;
int c = j % side;
if (tiles[r][c] == null)
continue;
int nextR = r + yIncr;
int nextC = c + xIncr;
while (nextR >= 0 && nextR < side && nextC >= 0 && nextC < side) {
Tile next = tiles[nextR][nextC];
Tile curr = tiles[r][c];
//如果下一个值是空的就移动到下一个值
if (next == null) {
if (checkingAvailableMoves)
return true;
tiles[nextR][nextC] = curr;
tiles[r][c] = null;
r = nextR;
c = nextC;
nextR += yIncr;
nextC += xIncr;
moved = true;
} else if (next.canMergeWith(curr)) {
if (checkingAvailableMoves)
return true;
int value = next.mergeWith(curr);
if (value > highest)
highest = value;
score += value;
//之前的数字块变成空的，可继续移动
tiles[r][c] = null;
moved = true;
break;
} else
break;
}
}
if (moved) {
if (highest < target) {
clearMerged();
addRandomTile();
if (!movesAvailable()) {
gamestate = State.over;
}
} else if (highest == target)
gamestate = State.won;
}
return moved;
}
boolean moveUp() {
return move(0, -1, 0);
}
boolean moveDown() {
return move(side * side - 1, 1, 0);
}
boolean moveLeft() {
return move(0, 0, -1);
}
boolean moveRight() {
return move(side * side - 1, 0, 1);
}
void clearMerged() {
for (Tile[] row : tiles)
for (Tile tile : row)
if (tile != null)
tile.setMerged(false);
}
boolean movesAvailable() {
checkingAvailableMoves = true;
boolean hasMoves = moveUp() || moveDown() || moveLeft() || moveRight();
checkingAvailableMoves = false;
return hasMoves;
}
//主方法
public static void main(String[] args) {
//为了避免线程问题，使用invokeLater在事件分发线程中为所有新应用程序创建GUI
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setTitle("2048");
f.setResizable(true);
f.add(new Game2048(), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
class Tile {
//merged判断能否合并
private boolean merged;
private int value;
Tile(int val) {
value = val;
}
int getValue() {
return value;
}
void setMerged(boolean m) {
merged = m;
}
boolean canMergeWith(Tile other) {
return !merged && other != null && !other.merged && value == other.getValue();
}
int mergeWith(Tile other) {
if (canMergeWith(other)) {
value *= 2;
merged = true;
return value;
}
return -1;
}
}
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