Tetris/Java
< Tetris
Java
<lang java>import java.awt.*; import java.awt.event.*; import static java.lang.String.format; import java.util.Arrays; import javax.swing.*;
public class Tetris extends JPanel implements Runnable {
public static final int EMPTY = -1; public static final int BORDER = -2;
final Color[] colors = {Color.green, Color.red, Color.blue, Color.pink,
Color.orange, Color.cyan, Color.magenta};
// for centering the shapes in the preview window
final int[][] previewOffets = {{16, 15}, {-15, 15}, {0, 0}, {0, 0},
{-15, 5}, {16, 15}, {-15, 15}};
int[][] grid;
Shape selectedShape; Shape preSelectedShape;
int blockSize = 30; int nRows = 18; int nCols = 12; int shapeRow; int shapeCol; int topMargin = 50; int leftMargin = 20;
Thread fallingThread; Scoreboard scoreboard;
Font smallFont; Rectangle gridRect, previewRect;
public Tetris() {
setPreferredSize(new Dimension(640, 640));
setBackground(new Color(0xDDEEFF));
setFont(new Font("Monospaced", Font.BOLD, 48));
setFocusable(true);
smallFont = getFont().deriveFont(Font.BOLD, 18);
gridRect = new Rectangle(46, 47, 308, 517);
previewRect = new Rectangle(387, 47, 200, 200);
scoreboard = new Scoreboard();
grid = new int[nRows][nCols];
initGrid();
selectShape();
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
if (scoreboard.isGameOver()) {
startNewGame();
repaint();
}
}
});
addKeyListener(new KeyAdapter() {
boolean fastDown;
@Override
public void keyPressed(KeyEvent e) {
if (scoreboard.isGameOver())
return;
switch (e.getKeyCode()) {
case KeyEvent.VK_UP:
if (canRotate(selectedShape))
rotate(selectedShape);
break;
case KeyEvent.VK_LEFT:
if (canMove(selectedShape, -1, 0))
move(selectedShape, -1, 0);
break;
case KeyEvent.VK_RIGHT:
if (canMove(selectedShape, 1, 0))
move(selectedShape, 1, 0);
break;
case KeyEvent.VK_DOWN:
if (!fastDown) {
fastDown = true;
while (canMove(selectedShape, 0, 1)) {
move(selectedShape, 0, 1);
repaint();
}
shapeHasLanded();
}
}
repaint();
}
@Override
public void keyReleased(KeyEvent e) {
fastDown = false;
}
});
}
void selectShape() {
shapeRow = 1;
shapeCol = 5;
selectedShape = preSelectedShape;
preSelectedShape = Shape.values()[(int) (Math.random() * colors.length)];
if (selectedShape != null)
selectedShape.reset();
}
void startNewGame() {
stop();
initGrid();
selectShape();
scoreboard.reset();
(fallingThread = new Thread(this)).start();
}
void stop() {
if (fallingThread != null) {
Thread tmp = fallingThread;
fallingThread = null;
tmp.interrupt();
}
}
void initGrid() {
for (int r = 0; r < nRows; r++) {
Arrays.fill(grid[r], EMPTY);
for (int c = 0; c < nCols; c++) {
if (c == 0 || c == nCols - 1 || r == nRows - 1)
grid[r][c] = BORDER;
}
}
}
@Override
public void run() {
while (Thread.currentThread() == fallingThread) {
try {
Thread.sleep(scoreboard.getSpeed());
} catch (InterruptedException ignored) {
}
if (!scoreboard.isGameOver()) {
if (canMove(selectedShape, 0, 1)) {
move(selectedShape, 0, 1);
} else {
shapeHasLanded();
}
repaint();
}
}
}
void drawStartScreen(Graphics2D g) {
g.setFont(getFont());
g.setColor(new Color(0xFFFFFF));
g.fillRect(leftMargin + 80, topMargin + 35, 252, 100);
g.fillRect(leftMargin + 30, topMargin + 325, 252, 40);
g.setColor(Color.black);
g.drawString("Tetris", leftMargin + 110, topMargin + 100);
g.setFont(smallFont);
g.drawString("click to start", leftMargin + 100, topMargin + 350);
}
void drawSquare(Graphics2D g, Color color, int r, int c) {
g.setStroke(new BasicStroke(2));
g.setColor(color);
g.fillRect(leftMargin + c * blockSize, topMargin + r * blockSize,
blockSize, blockSize);
g.setColor(Color.white);
g.drawRect(leftMargin + c * blockSize, topMargin + r * blockSize,
blockSize, blockSize);
}
void drawUI(Graphics2D g) {
g.setStroke(new BasicStroke(5));
g.setColor(new Color(0xBECFEA));
g.fill(gridRect);
g.setColor(new Color(0x7788AA));
g.draw(gridRect);
g.draw(previewRect);
for (int r = 0; r < nRows; r++) {
for (int c = 0; c < nCols; c++) {
int id = grid[r][c];
if (id > EMPTY)
drawSquare(g, colors[id], r, c);
}
}
g.setColor(Color.black);
g.setFont(smallFont);
g.drawString(format("hiscore %6d", scoreboard.getTopscore()),400, 330);
g.drawString(format("level %6d", scoreboard.getLevel()), 400, 360);
g.drawString(format("lines %6d", scoreboard.getLines()), 400, 390);
g.drawString(format("score %6d", scoreboard.getScore()), 400, 420);
}
void drawPreview(Graphics2D g) {
int ord = preSelectedShape.ordinal();
g.translate(previewOffets[ord][0], previewOffets[ord][1]);
for (int[] p : preSelectedShape.shapes[ord]) {
drawSquare(g, colors[ord], 2 + p[1], 15 + p[0]);
}
g.translate(-previewOffets[ord][0], -previewOffets[ord][1]);
}
void drawFallingShape(Graphics2D g) {
Color c = colors[selectedShape.ordinal()];
for (int[] p : selectedShape.pos)
drawSquare(g, c, shapeRow + p[1], shapeCol + p[0]);
}
@Override
public void paintComponent(Graphics gg) {
super.paintComponent(gg);
Graphics2D g = (Graphics2D) gg;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawUI(g);
if (fallingThread == null) {
drawStartScreen(g);
} else {
drawFallingShape(g);
}
drawPreview(g); }
boolean canRotate(Shape s) {
if (s == Shape.Square)
return false;
int[][] pos = new int[4][2];
for (int i = 0; i < pos.length; i++) {
pos[i] = s.pos[i].clone();
}
for (int[] row : pos) {
int tmp = row[0];
row[0] = row[1];
row[1] = -tmp;
}
for (int[] p : pos) {
int newCol = shapeCol + p[0];
int newRow = shapeRow + p[1];
if (grid[newRow][newCol] != EMPTY) {
return false;
}
}
return true;
}
void rotate(Shape s) {
if (s == Shape.Square)
return;
for (int[] row : s.pos) {
int tmp = row[0];
row[0] = row[1];
row[1] = -tmp;
}
}
void move(Shape s, int xIncr, int yIncr) {
shapeRow += yIncr;
shapeCol += xIncr;
}
boolean canMove(Shape s, int xIncr, int yIncr) {
for (int[] p : s.pos) {
int newCol = shapeCol + xIncr + p[0];
int newRow = shapeRow + yIncr + p[1];
if (grid[newRow][newCol] != EMPTY)
return false;
}
return true;
}
void shapeHasLanded() {
addShape(selectedShape);
if (shapeRow < 2) {
scoreboard.setGameOver();
scoreboard.setTopscore();
stop();
} else {
scoreboard.addLines(removeLines());
}
selectShape();
}
int removeLines() {
int count = 0;
for (int r = 0; r < nRows - 1; r++) {
for (int c = 1; c < nCols - 1; c++) {
if (grid[r][c] == EMPTY)
break;
if (c == nCols - 2) {
count++;
removeLine(r);
}
}
}
return count;
}
void removeLine(int line) {
for (int c = 0; c < nCols; c++)
grid[line][c] = EMPTY;
for (int c = 0; c < nCols; c++) {
for (int r = line; r > 0; r--)
grid[r][c] = grid[r - 1][c];
}
}
void addShape(Shape s) {
for (int[] p : s.pos)
grid[shapeRow + p[1]][shapeCol + p[0]] = s.ordinal();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setTitle("Tetris");
f.setResizable(false);
f.add(new Tetris(), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
class Scoreboard {
static final int MAXLEVEL = 9;
private int level; private int lines; private int score; private int topscore; private boolean gameOver = true;
void reset() {
setTopscore();
level = lines = score = 0;
gameOver = false;
}
void setGameOver() {
gameOver = true;
}
boolean isGameOver() {
return gameOver;
}
void setTopscore() {
if (score > topscore)
topscore = score;
}
int getTopscore() {
return topscore;
}
int getSpeed() {
switch (level) {
case 0:
return 700;
case 1:
return 600;
case 2:
return 500;
case 3:
return 400;
case 4:
return 350;
case 5:
return 300;
case 6:
return 250;
case 7:
return 200;
case 8:
return 150;
case 9:
return 100;
default:
return 100;
}
}
void addScore(int sc) {
score += sc;
}
void addLines(int line) {
switch (line) {
case 1:
addScore(10);
break;
case 2:
addScore(20);
break;
case 3:
addScore(30);
break;
case 4:
addScore(40);
break;
default:
return;
}
lines += line;
if (lines > 10)
addLevel();
}
void addLevel() {
lines %= 10;
if (level < MAXLEVEL)
level++;
}
int getLevel() {
return level;
}
int getLines() {
return lines;
}
int getScore() {
return score;
}
}
enum Shape {
ZShape, SShape, Straight, TShape, Square, LShape, JShape;
private Shape() {
pos = new int[4][2];
reset();
}
void reset() {
for (int i = 0; i < pos.length; i++) {
pos[i] = shapes[ordinal()][i].clone();
}
}
final int[][] pos;
final int[][][] shapes = {
{{0, -1}, {0, 0}, {-1, 0}, {-1, 1}},
{{0, -1}, {0, 0}, {1, 0}, {1, 1}},
{{0, -1}, {0, 0}, {0, 1}, {0, 2}},
{{-1, 0}, {0, 0}, {1, 0}, {0, 1}},
{{0, 0}, {1, 0}, {0, 1}, {1, 1}},
{{-1, -1}, {0, -1}, {0, 0}, {0, 1}},
{{1, -1}, {0, -1}, {0, 0}, {0, 1}}};
}</lang>