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贪吃蛇项目（简单）
2022-07-31 15:15:00 【Jm呀】
文章目录
1.游戏规则
分为三个关卡，每个关卡需要吃掉15个食物，才可进入下一关。
当蛇头碰到自身时，游戏失败！
可随意穿墙，会从另一侧出来！
2.游戏操作
w：上
s：下
a：左
d：右
空格：暂停/继续
3.代码片段
1）GameWin（主入口）
package com;
import com.obj.BodyObj;
import com.obj.FoodObj;
import com.obj.HeadObj;
import com.utils.GameUtils;
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.List;
public class GameWin extends JFrame {
//分数统计
public static int score=0;
//游戏状态 0.未开始 1.游戏中 2.暂停 3.失败 4.通关 5.失败后重新开始 6.下一关
public static int state=0;
/*//定义双缓存图片 Image offScreenImage=null;*/
//窗口宽高
int winWidth=800;
int winHight=600;
//蛇头对象
public HeadObj headObj=new HeadObj(GameUtils.rightImg,60,570,this);
//蛇身集合
public List<BodyObj> bodyObjList=new ArrayList<>();
//食物对象
public FoodObj foodObj=new FoodObj().getFood();
//先
public void launch(){
//设置窗口是否可见
this.setVisible(true);
//设置窗口的大小
this.setSize(winWidth,winHight);
//设置窗口不可调大小
this.setResizable(false);
//设置窗口的位置在屏幕上居中
this.setLocationRelativeTo(null);
//设置窗口的标题
this.setTitle("Jm养贪吃蛇");
//蛇身体的初始化
bodyObjList.add(new BodyObj(GameUtils.bodyImg,30,570,this));
bodyObjList.add(new BodyObj(GameUtils.bodyImg,0,570,this));
//键盘监听事件
this.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_SPACE){
switch (state){
//未开始
case 0:
state=1;
break;
//游戏中
case 1:
state=2;
repaint();
break;
//暂停中
case 2:
state=1;
break;
//失败了
case 3:
state=5;
break;
//通过当前关卡
case 4:
state=6;
break;
default:
break;
}
}
}
});
while (true){
//游戏中调用repaint()
if(state==1){
repaint();
}
//失败重启
if(state==5){
state=0;
resetGame();
}
//通过当前关卡
if(state==6){
if(GameUtils.level!=3)
{
state=1;
GameUtils.level++;
resetGame();
}else{
state=1;
GameUtils.level=1;
resetGame();
}
}
try {
//1s=1000ms
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
//后
@Override
public void paint(Graphics gImage) {
/*//初始化双缓存图片 if(offScreenImage==null){ offScreenImage=this.createImage(winWidth,winHight); } //获取双缓存图片的graphics对象 Graphics gImage=offScreenImage.getGraphics();*/
//设置背景颜色
gImage.setColor(Color.GREEN);
gImage.fillRect(0,0,winWidth,winHight);
//网格线颜色
gImage.setColor(Color.BLACK);
//网格划线
for(int i=0;i<=20;i++)
{
//左上角为原点，向右为x轴正向，向下为y轴正向
//画横线
gImage.drawLine(0,30*i,600,30*i);
//画竖线
gImage.drawLine(30*i,0,30*i,600);
}
//绘制蛇身
for(int i=bodyObjList.size()-1;i>=0;i--){
bodyObjList.get(i).paintSelf(gImage);
}
//绘制蛇头
headObj.paintSelf(gImage);
//绘制食物
foodObj.paintSelf(gImage);
//绘制关卡
GameUtils.drawWord(gImage,"第"+GameUtils.level+"关",Color.ORANGE,40,640,260);
//绘制分数
GameUtils.drawWord(gImage,GameWin.score+"分",Color.red,40,650,320);
//绘制提示语
prompt(gImage);
/*//将双缓存图片绘制到窗口中 g.drawImage(offScreenImage,0,0,null);*/
}
//绘制提示音
void prompt(Graphics g){
//未开始
if(state==0){
g.setColor(Color.BLUE);
g.fillRect(100,200,400,100);
GameUtils.drawWord(g,"按下空格,游戏开始",Color.YELLOW,40,110,260);
}
//暂停
if(state==2){
g.setColor(Color.BLUE);
g.fillRect(100,200,400,100);
GameUtils.drawWord(g,"按下空格,游戏继续",Color.YELLOW,40,110,260);
}
//失败
if(state==3){
g.setColor(Color.BLUE);
g.fillRect(100,200,400,150);
GameUtils.drawWord(g,"很遗憾，游戏失败",Color.RED,40,110,260);
GameUtils.drawWord(g,"按下空格,重新开始",Color.RED,40,110,320);
}
//通过
if(state==4){
g.setColor(Color.BLUE);
if(GameUtils.level==3){
g.fillRect(100,200,400,150);
GameUtils.drawWord(g,"达成条件，游戏通关",Color.GREEN,40,110,260);
GameUtils.drawWord(g,"按下空格,再玩一次",Color.GREEN,40,110,320);
}else {
g.fillRect(100,200,400,100);
GameUtils.drawWord(g,"按下空格,进入下一关",Color.GREEN,40,110,260);
}
}
}
//游戏重置
public void resetGame(){
//分数重置
score=0;
//关闭当前窗口
this.dispose();
//开启新的窗口
String[] args={
};
main(args);
}
//程序主入口
public static void main(String[] args) {
//创建窗口对象
GameWin gameWin=new GameWin();
//调用方法，设置窗口
gameWin.launch();
}
}
2）GameObj（游戏物品类）
package com.obj;
import com.GameWin;
import java.awt.*;
//物品类
public class GameObj {
//图片
Image img;
//坐标
int x;
int y;
//宽高
int width = 30;
int height = 30;
//窗口类的引用
GameWin frame;
//setter 和 getter
public Image getImg() {
return img;
}
public void setImg(Image img) {
this.img = img;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public GameWin getFrame() {
return frame;
}
public void setFrame(GameWin frame) {
this.frame = frame;
}
//无参构造
public GameObj() {
}
//有参构造
public GameObj(Image img, int x, int y, GameWin frame) {
this.img = img;
this.x = x;
this.y = y;
this.frame = frame;
}
//有参构造
public GameObj(Image img, int x, int y, int width, int height, GameWin frame) {
this.img = img;
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.frame = frame;
}
public void paintSelf(Graphics g){
g.drawImage(img,x,y,null);
}
}
3）GameUtils（游戏工具类）
package com.utils;
import java.awt.*;
//工具类
public class GameUtils {
//蛇头
public static Image upImg = Toolkit.getDefaultToolkit().getImage("src/img/up.png");
public static Image downImg = Toolkit.getDefaultToolkit().getImage("src/img/down.png");
public static Image leftImg = Toolkit.getDefaultToolkit().getImage("src/img/left.png");
public static Image rightImg = Toolkit.getDefaultToolkit().getImage("src/img/right.png");
//蛇身
public static Image bodyImg = Toolkit.getDefaultToolkit().getImage("src/img/body.png");
//食物
public static Image foodImg = Toolkit.getDefaultToolkit().getImage("src/img/food.png");
//关卡
public static int level=1;
//绘制文字
public static void drawWord(Graphics g,String str,Color color,int size,int x,int y){
g.setColor(color);
//设计字体显示效果 Font mf = new Font(String 字体，int 风格，int 字号);
g.setFont(new Font("宋体",Font.BOLD,size));
g.drawString(str,x,y);
}
}
4）HeadObj（蛇头类）
package com.obj;
import com.GameWin;
import com.utils.GameUtils;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
//蛇头类
public class HeadObj extends GameObj{
//方向 up down left right
private String direction = "right";
//setter 和 getter
public String getDirection() {
return direction;
}
public void setDirection(String direction) {
this.direction = direction;
}
//构造方法
public HeadObj() {
}
public HeadObj(Image img, int x, int y, GameWin frame) {
super(img,x,y,frame);
//键盘监听事件
this.frame.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
changeDirection(e);
}
});
}
//控制移动方向 -a:左（lft） -d:右（right） -w:上（up） -s:下（down）
public void changeDirection(KeyEvent e){
switch (e.getKeyCode()){
case KeyEvent.VK_A:
//不能向相反的方向移动
if(!"right".equals(direction)){
direction="left";
//改变蛇头方向图案
img= GameUtils.leftImg;
}
break;
case KeyEvent.VK_D:
if(!"left".equals(direction)){
direction="right";
//改变蛇头方向图案
img= GameUtils.rightImg;
}
break;
case KeyEvent.VK_W:
if(!"down".equals(direction)){
direction="up";
//改变蛇头方向图案
img= GameUtils.upImg;
}
break;
case KeyEvent.VK_S:
if(!"up".equals(direction)){
direction="down";
//改变蛇头方向图
// 案
img= GameUtils.downImg;
}
break;
default:
break;
}
}
//蛇的移动
public void move(){
//蛇身移动
for(int i=this.frame.bodyObjList.size()-1;i>=1;i--){
this.frame.bodyObjList.get(i).x=this.frame.bodyObjList.get(i-1).x;
this.frame.bodyObjList.get(i).y=this.frame.bodyObjList.get(i-1).y;
//蛇头与身体碰撞
if(this.x==this.frame.bodyObjList.get(i).x&&this.y==this.frame.bodyObjList.get(i).y){
//失败
GameWin.state=3;
}
}
this.frame.bodyObjList.get(0).x=this.x;
this.frame.bodyObjList.get(0).y=this.y;
//蛇头移动
switch (direction){
case "up":
y-=height;
break;
case "down":
y+=height;
break;
case "left":
x-=width;
break;
case "right":
x+=width;
break;
default:
break;
}
}
@Override
public void paintSelf(Graphics g) {
super.paintSelf(g);
Integer newX=null;
Integer newY=null;
//蛇吃食物
FoodObj food=this.frame.foodObj;
if(food.x==this.x&&food.y==this.y){
//生成新的食物位置
this.frame.foodObj=food.getFood();
//获取最后一节身体
BodyObj lastBody=this.frame.bodyObjList.get(this.frame.bodyObjList.size()-1);
newX=lastBody.x;
newY=lastBody.y;
//增加长度
GameWin.score++;
}
//通关判断
if(GameWin.score>=15){
//通过
GameWin.state=4;
}
//移动蛇头
move();
//move结束之后，新的bodyObj对象添加到bodyObjList
if(newX!=null&&newY!=null){
this.frame.bodyObjList.add(new BodyObj(GameUtils.bodyImg,newX,newY,this.frame));
}
//越界处理
if (x < 0){
x = 570;
} else if (x > 570){
x = 0;
} else if (y < 30){
y = 570;
}else if (y > 570){
y = 30;
}
}
}
5）BodyObj（蛇身类）
package com.obj;
import com.GameWin;
import java.awt.*;
public class BodyObj extends GameObj{
public BodyObj(Image img, int x, int y,GameWin frame) {
super(img,x,y,frame);
}
@Override
public void paintSelf(Graphics g) {
super.paintSelf(g);
}
}
6）FoodObj（食物类）
package com.obj;
import com.GameWin;
import com.utils.GameUtils;
import java.awt.*;
import java.util.Random;
public class FoodObj extends GameObj{
//随机数对象
Random random=new Random();
public FoodObj() {
super();
}
public FoodObj(Image img, int x, int y, GameWin frame) {
super(img, x, y, frame);
}
public FoodObj getFood(){
return new FoodObj(GameUtils.foodImg,random.nextInt(20)*30,(1+random.nextInt(19))*30,this.frame);
}
@Override
public void paintSelf(Graphics g) {
super.paintSelf(g);
}
}
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