主要用了javax.swing.Timer这个类:
import java.awt.*
import javax.swing.*
@SuppressWarnings("serial")
public class MainClass extends JFrame {
ControlSnake control
Toolkit kit
Dimension dimen
public static void main(String[] args) {
new MainClass("my snake")
}
public MainClass(String s) {
super(s)
control = new ControlSnake()
control.setFocusable(true)
kit = Toolkit.getDefaultToolkit()
dimen = kit.getScreenSize()
add(control)
setLayout(new BorderLayout())
setLocation(dimen.width / 3, dimen.height / 3)// dimen.width/3,dimen.height/3
setSize(FWIDTH, FHEIGHT)
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
setResizable(false)
setVisible(true)
}
public static final int FWIDTH = 315
public static final int FHEIGHT = 380
}
import java.util.*
import java.awt.*
import java.awt.event.*
import javax.swing.*
import javax.swing.Timer
import java.util.Random
@SuppressWarnings("serial")
public class ControlSnake extends JPanel implements ActionListener {
Random rand
ArrayList<Point>list, listBody
String str, str1
static boolean key
int x, y, dx, dy, fx, fy, flag
int snakeBody
int speed
public ControlSnake() {
snakeBody = 1
str = "上下左右方向键控制 P键暂停..."
str1 = "现在的长度为:" + snakeBody
key = true
flag = 1
speed = 700
rand = new Random()
list = new ArrayList<Point>()
listBody = new ArrayList<Point>()
x = 5
y = 5
list.add(new Point(x, y))
listBody.add(list.get(0))
dx = 10
dy = 0
fx = rand.nextInt(30) * 10 + 5// 2
fy = rand.nextInt(30) * 10 + 5// 2
setBackground(Color.WHITE)
setSize(new Dimension(318, 380))
final Timer time = new Timer(speed, this)
time.start()
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 37) {
dx = -10
dy = 0
} else if (e.getKeyCode() == 38) {
dx = 0
dy = -10
} else if (e.getKeyCode() == 39) {
dx = 10
dy = 0
} else if (e.getKeyCode() == 40) {
dx = 0
dy = 10
} else if (e.getKeyCode() == 80) {
if (flag % 2 == 1) {
time.stop()
}
if (flag % 2 == 0) {
time.start()
}
flag++
}
}
})
}
public void paint(Graphics g) {
g.setColor(Color.WHITE)
g.fillRect(0, 0, 400, 400)
g.setColor(Color.DARK_GRAY)
g.drawLine(3, 3, 305, 3)
g.drawLine(3, 3, 3, 305)
g.drawLine(305, 3, 305, 305)
g.drawLine(3, 305, 305, 305)
g.setColor(Color.PINK)
for (int i = 0i <listBody.size()i++) {
g.fillRect(listBody.get(i).x, listBody.get(i).y, 9, 9)
}
g.fillRect(x, y, 9, 9)
g.setColor(Color.ORANGE)
g.fillRect(fx, fy, 9, 9)
g.setColor(Color.DARK_GRAY)
str1 = "现在的长度为:" + snakeBody
g.drawString(str, 10, 320)
g.drawString(str1, 10, 335)
}
public void actionPerformed(ActionEvent e) {
x += dx
y += dy
if (makeOut() == false) {
JOptionPane.showMessageDialog(null, "重新开始......")
speed = 700
snakeBody = 1
x = 5
y = 5
list.clear()
list.add(new Point(x, y))
listBody.clear()
listBody.add(list.get(0))
dx = 10
dy = 0
}
addPoint(x, y)
if (x == fx &&y == fy) {
speed = (int) (speed * 0.8)//速度增加参数
if (speed <200) {
speed = 100
}
fx = rand.nextInt(30) * 10 + 5// 2
fy = rand.nextInt(30) * 10 + 5// 2
snakeBody++// 2
} // 2
repaint()
}
public void addPoint(int xx, int yy) {
// 动态的记录最新发生的50步以内的移动过的坐标
// 并画出最新的snakeBody
if (list.size() <100) {//蛇身长度最长为100
list.add(new Point(xx, yy))
} else {
list.remove(0)
list.add(new Point(xx, yy))
}
if (snakeBody == 1) {
listBody.remove(0)
listBody.add(0, list.get(list.size() - 1))
} else {
listBody.clear()
if (list.size() <snakeBody) {
for (int i = list.size() - 1i >0i--) {
listBody.add(list.get(i))
}
} else {
for (int i = list.size() - 1listBody.size() <snakeBodyi--) {
listBody.add(list.get(i))
}
}
}
}
public boolean makeOut() {
if ((x <3 || y <3) || (x >305 || y >305)) {
return false
}
for (int i = 0i <listBody.size() - 1i++) {
for (int j = i + 1j <listBody.size()j++) {
if (listBody.get(i).equals(listBody.get(j))) {
return false
}
}
}
return true
}
}
用MVC方式实现的贪吃蛇游戏，共有4个类。运行GreedSnake运行即可。主要是观察者模式的使用，我已经添加了很多注释了。1、
/*
* 程序名称：贪食蛇
* 原作者：BigF
* 修改者：algo
* 说明：我以前也用C写过这个程序，现在看到BigF用Java写的这个，发现虽然作者自称是Java的初学者，
* 但是明显编写程序的素养不错，程序结构写得很清晰，有些细微得地方也写得很简洁，一时兴起之
* 下，我认真解读了这个程序，发现数据和表现分开得很好，而我近日正在学习MVC设计模式，
* 因此尝试把程序得结构改了一下，用MVC模式来实现，对源程序得改动不多。
* 我同时也为程序增加了一些自己理解得注释，希望对大家阅读有帮助。
*/
package mvcTest
/**
* @author WangYu
* @version 1.0
* Description:
* </pre>
* Create on :Date :2005-6-13 Time:15:57:16
* LastModified:
* History:
*/
public class GreedSnake {
public static void main(String[] args) {
SnakeModel model = new SnakeModel(20,30)
SnakeControl control = new SnakeControl(model)
SnakeView view = new SnakeView(model,control)
//添加一个观察者，让view成为model的观察者
model.addObserver(view)
(new Thread(model)).start()
}
}
-------------------------------------------------------------
2、
package mvcTest
//SnakeControl.java
import java.awt.event.KeyEvent
import java.awt.event.KeyListener
/**
* MVC中的Controler，负责接收用户的操作，并把用户操作通知Model
*/
public class SnakeControl implements KeyListener{
SnakeModel model
public SnakeControl(SnakeModel model){
this.model = model
}
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode()
if (model.running){// 运行状态下，处理的按键
switch (keyCode) {
case KeyEvent.VK_UP:
model.changeDirection(SnakeModel.UP)
break
case KeyEvent.VK_DOWN:
model.changeDirection(SnakeModel.DOWN)
break
case KeyEvent.VK_LEFT:
model.changeDirection(SnakeModel.LEFT)
break
case KeyEvent.VK_RIGHT:
model.changeDirection(SnakeModel.RIGHT)
break
case KeyEvent.VK_ADD:
case KeyEvent.VK_PAGE_UP:
model.speedUp()
break
case KeyEvent.VK_SUBTRACT:
case KeyEvent.VK_PAGE_DOWN:
model.speedDown()
break
case KeyEvent.VK_SPACE:
case KeyEvent.VK_P:
model.changePauseState()
break
default:
}
}
// 任何情况下处理的按键，按键导致重新启动游戏
if (keyCode == KeyEvent.VK_R ||
keyCode == KeyEvent.VK_S ||
keyCode == KeyEvent.VK_ENTER) {
model.reset()
}
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
}
-------------------------------------------------------------
3、
/*
*
*/
package mvcTest
/**
* 游戏的Model类，负责所有游戏相关数据及运行
* @author WangYu
* @version 1.0
* Description:
* </pre>
* Create on :Date :2005-6-13 Time:15:58:33
* LastModified:
* History:
*/
//SnakeModel.java
import javax.swing.*
import java.util.Arrays
import java.util.LinkedList
import java.util.Observable
import java.util.Random
/**
* 游戏的Model类，负责所有游戏相关数据及运行
*/
class SnakeModel extends Observable implements Runnable {
boolean[][] matrix// 指示位置上有没蛇体或食物
LinkedList nodeArray = new LinkedList() // 蛇体
Node food
int maxX
int maxY
int direction = 2 // 蛇运行的方向
boolean running = false // 运行状态
int timeInterval = 200// 时间间隔，毫秒
double speedChangeRate = 0.75 // 每次得速度变化率
boolean paused = false// 暂停标志
int score = 0 // 得分
int countMove = 0 // 吃到食物前移动的次数
// 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( int maxX, int maxY) {
this.maxX = maxX
this.maxY = maxY
reset()
}
public void reset(){
direction = SnakeModel.UP // 蛇运行的方向
timeInterval = 200// 时间间隔，毫秒
paused = false// 暂停标志
score = 0 // 得分
countMove = 0 // 吃到食物前移动的次数
// initial matirx, 全部清0
matrix = new boolean[maxX][]
for (int i = 0i <maxX++i) {
matrix[i] = new boolean[maxY]
Arrays.fill(matrix[i], false)
}
// initial the snake
// 初始化蛇体，如果横向位置超过20个，长度为10，否则为横向位置的一半
int initArrayLength = maxX >20 ? 10 : maxX / 2
nodeArray.clear()
for (int i = 0i <initArrayLength++i) {
int x = maxX / 2 + i//maxX被初始化为20
int y = maxY / 2 //maxY被初始化为30
//nodeArray[x,y]: [10,15]-[11,15]-[12，15]~~[20,15]
//默认的运行方向向上，所以游戏一开始nodeArray就变为：
// [10，14]-[10，15]-[11，15]-[12，15]~~[19，15]
nodeArray.addLast(new Node(x, y))
matrix[x][y] = true
}
// 创建食物
food = createFood()
matrix[food.x][food.y] = true
}
public void changeDirection(int newDirection) {
// 改变的方向不能与原来方向同向或反向
if (direction % 2 != newDirection % 2) {
direction = newDirection
}
}
/**
* 运行一次
* @return
*/
public boolean moveOn() {
Node n = (Node) nodeArray.getFirst()
int x = n.x
int y = n.y
// 根据方向增减坐标值
switch (direction) {
case UP:
y--
break
case DOWN:
y++
break
case LEFT:
x--
break
case RIGHT:
x++
break
}
// 如果新坐标落在有效范围内，则进行处理
if ((0 <= x &&x <maxX) &&(0 <= y &&y <maxY)) {
if (matrix[x][y]) {// 如果新坐标的点上有东西（蛇体或者食物）
if (x == food.x &&y == food.y) { // 吃到食物，成功
nodeArray.addFirst(food) // 从蛇头赠长
// 分数规则，与移动改变方向的次数和速度两个元素有关
int scoreGet = (10000 - 200 * countMove) / timeInterval
score += scoreGet >0 ? scoreGet : 10
countMove = 0
food = createFood() // 创建新的食物
matrix[food.x][food.y] = true // 设置食物所在位置
return true
} else // 吃到蛇体自身，失败
return false
} else { // 如果新坐标的点上没有东西（蛇体），移动蛇体
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 // 触到边线，失败
}
public void run() {
running = true
while (running) {
try {
Thread.sleep(timeInterval)
} catch (Exception e) {
break
}
if (!paused) {
if (moveOn()) {
setChanged() // Model通知View数据已经更新
notifyObservers()
} else {
JOptionPane.showMessageDialog(null,
"you failed",
"Game Over",
JOptionPane.INFORMATION_MESSAGE)
break
}
}
}
running = false
}
private Node createFood() {
int x = 0
int y = 0
// 随机获取一个有效区域内的与蛇体和食物不重叠的位置
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 = 0i <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
}
}
------------------------------------------------------------
4、
package mvcTest
//SnakeView.java
import javax.swing.*
import java.awt.*
import java.util.Iterator
import java.util.LinkedList
import java.util.Observable
import java.util.Observer
/**
* MVC模式中得Viewer，只负责对数据的显示,而不用理会游戏的控制逻辑
*/
public class SnakeView implements Observer {
SnakeControl control = null
SnakeModel model = null
JFrame mainFrame
Canvas paintCanvas
JLabel labelScore
public static final int canvasWidth = 200
public static final int canvasHeight = 300
public static final int nodeWidth = 10
public static final int nodeHeight = 10
public SnakeView(SnakeModel model, SnakeControl control) {
this.model = model
this.control = control
mainFrame = new JFrame("GreedSnake")
Container cp = mainFrame.getContentPane()
// 创建顶部的分数显示
labelScore = new JLabel("Score:")
cp.add(labelScore, BorderLayout.NORTH)
// 创建中间的游戏显示区域
paintCanvas = new Canvas()
paintCanvas.setSize(canvasWidth + 1, canvasHeight + 1)
paintCanvas.addKeyListener(control)
cp.add(paintCanvas, BorderLayout.CENTER)
// 创建底下的帮助栏
JPanel panelButtom = new JPanel()
panelButtom.setLayout(new BorderLayout())
JLabel labelHelp
labelHelp = new JLabel("PageUp, PageDown for speed", JLabel.CENTER)
panelButtom.add(labelHelp, BorderLayout.NORTH)
labelHelp = new JLabel("ENTER or R or S for start", JLabel.CENTER)
panelButtom.add(labelHelp, BorderLayout.CENTER)
labelHelp = new JLabel("SPACE or P for pause", JLabel.CENTER)
panelButtom.add(labelHelp, BorderLayout.SOUTH)
cp.add(panelButtom, BorderLayout.SOUTH)
mainFrame.addKeyListener(control)
mainFrame.pack()
mainFrame.setResizable(false)
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
mainFrame.setVisible(true)
}
void repaint() {
Graphics g = paintCanvas.getGraphics()
//draw background
g.setColor(Color.WHITE)
g.fillRect(0, 0, canvasWidth, canvasHeight)
// draw the snake
g.setColor(Color.BLACK)
LinkedList na = model.nodeArray
Iterator it = na.iterator()
while (it.hasNext()) {
Node n = (Node) it.next()
drawNode(g, n)
}
// draw the food
g.setColor(Color.RED)
Node n = model.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: " + model.score
labelScore.setText(s)
}
public void update(Observable o, Object arg) {
repaint()
}
}
-------------------------------------------------------------
