GameFrame.java
import javax.swing.JFrame;
public class GameFrame extends JFrame{
GameFrame(){
this.add(new GamePanel());
this.setTitle("Snake");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
this.pack();
this.setVisible(true);
this.setLocationRelativeTo(null);
}
}
GamePanel.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
import javax.swing.JPanel;
public class GamePanel extends JPanel implements ActionListener {
static final int SCREEN_WIDTH = 600;
static final int SCREEN_HEIGHT = 600;
static final int UNIT_SIZE = 25; // how big the objects size will be
static final int GAME_UNITS = (SCREEN_WIDTH * SCREEN_HEIGHT) / UNIT_SIZE; // how many objects will fit on the screen
static final int DELAY = 105; // delay timer
final int x[] = new int[GAME_UNITS]; // these array going to hold all the coordinates for all the body parts of the
// snake including head too
final int y[] = new int[GAME_UNITS];
int bodyParts = 6; // initial amount for the body number of part of the snake
int applesEaten;
int appleX; // apple x coordinate
int appleY; // apple y coordinate
char direction = 'R';// Right for R at start of the game
boolean running = false;
Timer timer;
Random random;
GamePanel() {
random = new Random();
// preferred size for game pannel
this.setPreferredSize(new Dimension(SCREEN_WIDTH, SCREEN_HEIGHT));
// background color of game pannel
this.setBackground(Color.black);
// Sets the focusable state of this Component to the specified value. Thisvalue
// overrides the Component's default focusability.
// Parameters:focusable indicates whether this Component is focusable
this.setFocusable(true);
this.addKeyListener(new MyKeyAdapter());
startGame();
}
public void startGame() {
newApple();
running = true;
/*
* Creates a Timer and initializes both the initial delay andbetween-event delay
* to delay milliseconds. If delayis less than or equal to zero, the timer fires
* as soon as itis started. If listener is not null,it's registered as an action
* listener on the timer. Parameters:delay milliseconds for the initial and
* between-event delaylistener an initial listener; can be null
*/
timer = new Timer(DELAY, this);
timer.start();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
draw(g);
}
public void draw(Graphics g) {
if (running) {
// draw grid lines
/*
* for (int i = 0; i < SCREEN_HEIGHT / UNIT_SIZE; i++) { // draw line on x axis
* and y axis g.drawLine(i * UNIT_SIZE, 0, i * UNIT_SIZE, SCREEN_HEIGHT);
* g.drawLine(0, i * UNIT_SIZE, SCREEN_WIDTH, i * UNIT_SIZE);
*
* }
*/
// draw apple
g.setColor(Color.red);
g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE);
// draw head and body of the snake
for (int i = 0; i < bodyParts; i++) {
if (i == 0) {
//g.setColor(Color.green);
g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
} else {
//g.setColor(new Color(45, 180, 0));
// different green color
g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
}
}
// game over text
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 40));
FontMetrics metrics = getFontMetrics(g.getFont());
g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics.stringWidth("Score: " + applesEaten)) / 2,
g.getFont().getSize());
} else {
gameOver(g);
}
}
public void newApple() {
appleX = random.nextInt((int) (SCREEN_WIDTH / UNIT_SIZE)) * UNIT_SIZE;
appleY = random.nextInt((int) (SCREEN_HEIGHT / UNIT_SIZE)) * UNIT_SIZE;
}
public void move() {
// move body parts of the snake
for (int i = bodyParts; i > 0; i--) {
// move the part by one
x[i] = x[i - 1];
y[i] = y[i - 1];
}
// switch the direction of the snake
switch (direction) {
case 'U':
y[0] = y[0] - UNIT_SIZE;
break;// it will go to next position
case 'D':
y[0] = y[0] + UNIT_SIZE;
break;
case 'L':
x[0] = x[0] - UNIT_SIZE;
break;
case 'R':
x[0] = x[0] + UNIT_SIZE;
break;
}
}
public void checkApple() {
if ((x[0] == appleX) && (y[0] == appleY)) {
bodyParts++;
applesEaten++;
newApple();
}
}
public void checkCollisions() {
// checks if head collide with the body
for (int i = bodyParts; i > 0; i--) {
if ((x[0] == x[i]) && (y[0] == y[i])) {
running = false;
}
}
// checks if head touches left border
if (x[0] < 0) {
running = false;
}
// x horizontal
// check if head touches right border
if (x[0] > SCREEN_WIDTH) {
running = false;
}
// check if head touches top border
if (y[0] < 0) {
running = false;
}
// check if head touches bottom border
if (y[0] > SCREEN_HEIGHT) {
running = false;
}
// stop timer
if (!running) {
timer.stop();
}
}
public void gameOver(Graphics g) {
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 40));
FontMetrics metrics1 = getFontMetrics(g.getFont());
g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics1.stringWidth("Score: " + applesEaten)) / 2,
g.getFont().getSize());
// game over text
g.setColor(Color.red);
g.setFont(new Font("Ink Free", Font.BOLD, 75));
FontMetrics metrics2 = getFontMetrics(g.getFont());
g.drawString("Game Over", (SCREEN_WIDTH - metrics2.stringWidth("Game Over")) / 2, SCREEN_HEIGHT / 2);
}
@Override
public void actionPerformed(ActionEvent e) {
if (running) {
move();
checkApple();
checkCollisions();
}
repaint();
}
// inner class
public class MyKeyAdapter extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
if (direction != 'R') {
direction = 'L';
}
break;
case KeyEvent.VK_RIGHT:
if (direction != 'L') {
direction = 'R';
}
break;
case KeyEvent.VK_DOWN:
if (direction != 'U') {
direction = 'D';
}
break;
case KeyEvent.VK_UP:
if (direction != 'D') {
direction = 'U';
}
break;
}
}
}
}
SnakeGame.java
public class SnakeGame {
public static void main(String[] args) {
// TODO Auto-generated method stub
new GameFrame();
}
}
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