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package greedSnake;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class GreedSnake implements KeyListener
{
JFrame mainFrame;
Canvas paintCanvas;
JLabel labelScore;
SnakeModel snakeModel = null;
public static final int canvasWidth = 800;
public static final int canvasHeight = 500;
public static final int nodeWidth = 20;
public static final int nodeHeight = 20;
public GreedSnake()
{
mainFrame = new JFrame("贪吃蛇游戏");
Container cp = mainFrame.getContentPane(); labelScore = new JLabel("Score:");
cp.add(labelScore, BorderLayout.NORTH); paintCanvas = new Canvas();
paintCanvas.setSize(canvasWidth 1,canvasHeight 1); paintCanvas.addKeyListener(this);
cp.add(paintCanvas, BorderLayout.CENTER); JPanel panelButtom = new JPanel();
panelButtom.setLayout(new BorderLayout()); JLabel labelHelp; labelHelp = new JLabel("按PageUp, PageDown键增大或减小速度;", JLabel.LEFT);
panelButtom.add(labelHelp, BorderLayout.NORTH); labelHelp = new JLabel("输入ENTER 或者按A、B键开始游戏;", JLabel.LEFT);
panelButtom.add(labelHelp, BorderLayout.CENTER); labelHelp = new JLabel("输入SPACE 或者按S键暂停",JLabel.LEFT);
panelButtom.add(labelHelp, BorderLayout.SOUTH); cp.add(panelButtom,BorderLayout.SOUTH); mainFrame.addKeyListener(this);
mainFrame.pack();
mainFrame.setResizable(false);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setVisible(true);
begin();
}
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if (snakeModel.running)
switch(keyCode)
{
case KeyEvent.VK_UP:
snakeModel.changeDirection(SnakeModel.UP);
break;
case KeyEvent.VK_DOWN:
snakeModel.changeDirection(SnakeModel.DOWN);
break;
case KeyEvent.VK_LEFT:
snakeModel.changeDirection(SnakeModel.LEFT);
break;
case KeyEvent.VK_RIGHT:
snakeModel.changeDirection(SnakeModel.RIGHT);
break;
case KeyEvent.VK_ADD:
case KeyEvent.VK_PAGE_UP:
snakeModel.speedUp();
break;
case KeyEvent.VK_SUBTRACT:
case KeyEvent.VK_PAGE_DOWN:
snakeModel.speedDown();
break;
case KeyEvent.VK_SPACE:
case KeyEvent.VK_S:
snakeModel.changePauseState();
break;
default:
}
if (keyCode == KeyEvent.VK_A ||
keyCode == KeyEvent.VK_B ||
keyCode == KeyEvent.VK_ENTER) {
snakeModel.running = false;
begin();
}
}
public void keyReleased(KeyEvent e){
}
public void keyTyped(KeyEvent e){
}
void repaint()
{
Graphics g = paintCanvas.getGraphics();
//draw background
g.setColor(Color.WHITE);
g.fillRect(0,0,canvasWidth,canvasHeight);
// draw the snake
g.setColor(Color.CYAN);
LinkedList na = snakeModel.nodeArray;
Iterator it = na.iterator();
while(it.hasNext())
{
Node n = (Node)it.next();
drawNode(g,n);
}
// draw the food
g.setColor(Color.PINK);
Node n = snakeModel.food;
drawNode(g,n);
updateScore();
}
private void drawNode(Graphics g, Node n) {
g.fillRect(n.x*nodeWidth,
n.y*nodeHeight,
nodeWidth-1,
nodeHeight-1);
}
public void updateScore()
{
String s = "Score: " snakeModel.score;
labelScore.setText(s);
}
void begin()
{
if (snakeModel == null || !snakeModel.running) {
snakeModel = new SnakeModel(this,
canvasWidth/nodeWidth,
canvasHeight/nodeHeight);
(new Thread(snakeModel)).start();
}
}
public static void main(String[] args) {
GreedSnake gs = new GreedSnake();
}
}
class SnakeModel implements Runnable {
GreedSnake gs;
boolean[][] matrix;
LinkedList nodeArray = new LinkedList();
Node food;
int maxX;
int maxY;
int direction = 2;
boolean running = false;
int timeInterval = 200;
double speedChangeRate = 0.50;
boolean paused = false;
int score = 0;
int countMove = 0;
// UP and DOWN should be even
// RIGHT and LEFT should be odd
public static final int UP = 2;
public static final int DOWN = 4;
public static final int LEFT = 1;
public static final int RIGHT = 3;
public SnakeModel(GreedSnake gs, int maxX, int maxY)
{
this.gs = gs;
this.maxX = maxX;
this.maxY = maxY;
// initial matirx
matrix = new boolean[maxX][];
for(int i=0; i<maxX; i){
matrix[i] = new boolean[maxY];
Arrays.fill(matrix[i],false);
}
// initial the snake
int initArrayLength = maxX > 20 ? 10 : maxX/2;
for(int i = 0; i < initArrayLength; i) {
int x = maxX/2 i;
int y = maxY/2;
nodeArray.addLast(new Node(x, y));
matrix[x][y] = true;
}
food = createFood();
matrix[food.x][food.y] = true;
}
public void changeDirection(int newDirection)
{
if (direction % 2 != newDirection % 2) {
direction = newDirection;
}
}
public boolean moveOn()
{
Node n = (Node)nodeArray.getFirst();
int x = n.x;
int y = n.y;
switch(direction)
{
case UP:
y--;
break;
case DOWN:
y ;
break;
case LEFT:
x--;
break;
case RIGHT:
x ;
break;
}
if ((0 <= x && x < maxX) && (0 <= y && y < maxY))
{
if (matrix[x][y])
{
if(x == food.x && y == food.y) {
nodeArray.addFirst(food);
int scoreGet = (10000 - 200 * countMove) / timeInterval;
score = scoreGet > 0? scoreGet : 10;
countMove = 0;
food = createFood();
matrix[food.x][food.y] = true;
return true;
}
else
return false;
}
else
{
nodeArray.addFirst(new Node(x,y));
matrix[x][y] = true;
n = (Node)nodeArray.removeLast();
matrix[n.x][n.y] = false;
countMove ;
return true;
}
}
return false;
}
public void run()
{
running = true;
while (running)
{
try
{
Thread.sleep(timeInterval);
} 
catch(Exception e)
{
break;
}
if(!paused){
if (moveOn()){
gs.repaint();
}
else
{
JOptionPane.showMessageDialog(
null,
"你失败了",
"游戏结束",
JOptionPane.INFORMATION_MESSAGE);
break;
}
}
}
running = false;
}
private Node createFood() {
int x = 0;
int y = 0;
do{
Random r = new Random();
x = r.nextInt(maxX);
y = r.nextInt(maxY);
}
while(matrix[x][y]);
return new Node(x,y);
}
public void speedUp(){
timeInterval *= speedChangeRate;
}
public void speedDown() {
timeInterval /= speedChangeRate;
}
public void changePauseState()
{
paused = !paused;
}
public String toString()
{
String result = "";
for(int i=0; i<nodeArray.size(); i) {
Node n = (Node)nodeArray.get(i);
result = "[" n.x "," n.y "]";
}
return result;
}
}
class Node
{
int x;
int y;
Node(int x, int y)
{
this.x = x;
this.y = y;
}
}