Tetris/Java

From Rosetta Code
Tetris/Java is part of Tetris. You may find other members of Tetris at Category:Tetris.

Code[edit]

Works with: java version 8
package tetris;
 
import java.awt.*;
import java.awt.event.*;
import static java.lang.Math.*;
import static java.lang.String.format;
import java.util.*;
import javax.swing.*;
import static tetris.Config.*;
 
public class Tetris extends JPanel implements Runnable {
enum Dir {
right(1, 0), down(0, 1), left(-1, 0);
 
Dir(int x, int y) {
this.x = x;
this.y = y;
}
final int x, y;
};
 
public static final int EMPTY = -1;
public static final int BORDER = -2;
 
Shape fallingShape;
Shape nextShape;
 
// position of falling shape
int fallingShapeRow;
int fallingShapeCol;
 
final int[][] grid = new int[nRows][nCols];
 
Thread fallingThread;
final Scoreboard scoreboard = new Scoreboard();
static final Random rand = new Random();
 
public Tetris() {
setPreferredSize(dim);
setBackground(bgColor);
setFocusable(true);
 
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(fallingShape))
rotate(fallingShape);
break;
 
case KeyEvent.VK_LEFT:
if (canMove(fallingShape, Dir.left))
move(Dir.left);
break;
 
case KeyEvent.VK_RIGHT:
if (canMove(fallingShape, Dir.right))
move(Dir.right);
break;
 
case KeyEvent.VK_DOWN:
if (!fastDown) {
fastDown = true;
while (canMove(fallingShape, Dir.down)) {
move(Dir.down);
repaint();
}
shapeHasLanded();
}
}
repaint();
}
 
@Override
public void keyReleased(KeyEvent e) {
fastDown = false;
}
});
}
 
void selectShape() {
fallingShapeRow = 1;
fallingShapeCol = 5;
fallingShape = nextShape;
Shape[] shapes = Shape.values();
nextShape = shapes[rand.nextInt(shapes.length)];
if (fallingShape != null)
fallingShape.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 e) {
return;
}
 
if (!scoreboard.isGameOver()) {
if (canMove(fallingShape, Dir.down)) {
move(Dir.down);
} else {
shapeHasLanded();
}
repaint();
}
}
}
 
void drawStartScreen(Graphics2D g) {
g.setFont(mainFont);
 
g.setColor(titlebgColor);
g.fill(titleRect);
g.fill(clickRect);
 
g.setColor(textColor);
g.drawString("Tetris", titleX, titleY);
 
g.setFont(smallFont);
g.drawString("click to start", clickX, clickY);
}
 
void drawSquare(Graphics2D g, int colorIndex, int r, int c) {
g.setColor(colors[colorIndex]);
g.fillRect(leftMargin + c * blockSize, topMargin + r * blockSize,
blockSize, blockSize);
 
g.setStroke(smallStroke);
g.setColor(squareBorder);
g.drawRect(leftMargin + c * blockSize, topMargin + r * blockSize,
blockSize, blockSize);
}
 
void drawUI(Graphics2D g) {
// grid background
g.setColor(gridColor);
g.fill(gridRect);
 
// the blocks dropped in the grid
for (int r = 0; r < nRows; r++) {
for (int c = 0; c < nCols; c++) {
int idx = grid[r][c];
if (idx > EMPTY)
drawSquare(g, idx, r, c);
}
}
 
// the borders of grid and preview panel
g.setStroke(largeStroke);
g.setColor(gridBorderColor);
g.draw(gridRect);
g.draw(previewRect);
 
// scoreboard
int x = scoreX;
int y = scoreY;
g.setColor(textColor);
g.setFont(smallFont);
g.drawString(format("hiscore  %6d", scoreboard.getTopscore()), x, y);
g.drawString(format("level  %6d", scoreboard.getLevel()), x, y + 30);
g.drawString(format("lines  %6d", scoreboard.getLines()), x, y + 60);
g.drawString(format("score  %6d", scoreboard.getScore()), x, y + 90);
 
// preview
int minX = 5, minY = 5, maxX = 0, maxY = 0;
for (int[] p : nextShape.pos) {
minX = min(minX, p[0]);
minY = min(minY, p[1]);
maxX = max(maxX, p[0]);
maxY = max(maxY, p[1]);
}
double cx = previewCenterX - ((minX + maxX + 1) / 2.0 * blockSize);
double cy = previewCenterY - ((minY + maxY + 1) / 2.0 * blockSize);
 
g.translate(cx, cy);
for (int[] p : nextShape.shape)
drawSquare(g, nextShape.ordinal(), p[1], p[0]);
g.translate(-cx, -cy);
}
 
void drawFallingShape(Graphics2D g) {
int idx = fallingShape.ordinal();
for (int[] p : fallingShape.pos)
drawSquare(g, idx, fallingShapeRow + p[1], fallingShapeCol + 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 (scoreboard.isGameOver()) {
drawStartScreen(g);
} else {
drawFallingShape(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 = fallingShapeCol + p[0];
int newRow = fallingShapeRow + 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(Dir dir) {
fallingShapeRow += dir.y;
fallingShapeCol += dir.x;
}
 
boolean canMove(Shape s, Dir dir) {
for (int[] p : s.pos) {
int newCol = fallingShapeCol + dir.x + p[0];
int newRow = fallingShapeRow + dir.y + p[1];
if (grid[newRow][newCol] != EMPTY)
return false;
}
return true;
}
 
void shapeHasLanded() {
addShape(fallingShape);
if (fallingShapeRow < 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[fallingShapeRow + p[1]][fallingShapeCol + 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);
});
}
}
package tetris;
 
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;
}
}
package tetris;
 
enum Shape {
ZShape(new int[][]{{0, -1}, {0, 0}, {-1, 0}, {-1, 1}}),
SShape(new int[][]{{0, -1}, {0, 0}, {1, 0}, {1, 1}}),
IShape(new int[][]{{0, -1}, {0, 0}, {0, 1}, {0, 2}}),
TShape(new int[][]{{-1, 0}, {0, 0}, {1, 0}, {0, 1}}),
Square(new int[][]{{0, 0}, {1, 0}, {0, 1}, {1, 1}}),
LShape(new int[][]{{-1, -1}, {0, -1}, {0, 0}, {0, 1}}),
JShape(new int[][]{{1, -1}, {0, -1}, {0, 0}, {0, 1}});
 
private Shape(int[][] shape) {
this.shape = shape;
pos = new int[4][2];
reset();
}
 
void reset() {
for (int i = 0; i < pos.length; i++) {
pos[i] = shape[i].clone();
}
}
 
final int[][] pos, shape;
}
package tetris;
 
import java.awt.*;
 
final class Config {
final static Color[] colors = {Color.green, Color.red, Color.blue,
Color.pink, Color.orange, Color.cyan, Color.magenta};
 
final static Font mainFont = new Font("Monospaced", Font.BOLD, 48);
final static Font smallFont = mainFont.deriveFont(Font.BOLD, 18);
 
final static Dimension dim = new Dimension(640, 640);
 
final static Rectangle gridRect = new Rectangle(46, 47, 308, 517);
final static Rectangle previewRect = new Rectangle(387, 47, 200, 200);
final static Rectangle titleRect = new Rectangle(100, 85, 252, 100);
final static Rectangle clickRect = new Rectangle(50, 375, 252, 40);
 
final static int blockSize = 30;
final static int nRows = 18;
final static int nCols = 12;
final static int topMargin = 50;
final static int leftMargin = 20;
final static int scoreX = 400;
final static int scoreY = 330;
final static int titleX = 130;
final static int titleY = 150;
final static int clickX = 120;
final static int clickY = 400;
final static int previewCenterX = 467;
final static int previewCenterY = 97;
 
final static Stroke largeStroke = new BasicStroke(5);
final static Stroke smallStroke = new BasicStroke(2);
 
final static Color squareBorder = Color.white;
final static Color titlebgColor = Color.white;
final static Color textColor = Color.black;
final static Color bgColor = new Color(0xDDEEFF);
final static Color gridColor = new Color(0xBECFEA);
final static Color gridBorderColor = new Color(0x7788AA);
}