Java学习-GUI编程-贪吃蛇失败判定、积分系统

Java学习-GUI编程-贪吃蛇失败判定、积分系统

...
public class GamePanel extends JPanel implements KeyListener, ActionListener {
    ...
    int score;
    boolean isFail = false;
    //初始化方法
    public void init(){
    	...
        score=0;
    }
    @Override
    protected void paintComponent(Graphics g) {
    	...
        g.setColor(Color.white);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("长度:"+length,750,35);
        g.drawString("分数:"+score,750,50);
        if(isFail==true){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("游戏失败，按下空格重新开始",300,300);
        }
        ...
    }
    //键盘监听器
    @Override
    public void keyPressed(KeyEvent e){
        int keyCode = e.getKeyCode();//获得键盘按键
        if(keyCode==KeyEvent.VK_SPACE){
            if(isFail){
                isFail=false;
                init();
            }else{
                isStart=!isStart;
            }
            repaint();
        }
        ...
    }
    //事件监听
    @Override
    public void actionPerformed(ActionEvent e){
        if(isStart && isFail==false){
            //吃食物
            if(snakeX[0]==foodx && snakeY[0]==foody){
                length++;
                score+=10;
                ...
            }
            ...
            //失败判定
            for(int i=1;i<length;i++){
                if(snakeX[0]==snakeX[i]&&snakeY[0]==snakeY[i]){
                    isFail=true;
                }
            }
            ...
        }
        ...
    }
...
}

运行程序：

完整代码

package Snake;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

public class GamePanel extends JPanel implements KeyListener, ActionListener {
    //定义蛇的数据结构
    int length;//蛇的长度
    int[] snakeX = new int[600];
    int[] snakeY = new int[500];
    String dir;//初始化方向
    //食物坐标
    int foodx;
    int foody;
    Random random = new Random();
    int score;
    boolean isStart = false;//游戏状态默认暂停
    boolean isFail = false;
    //定时器，以毫秒为单位
    Timer timer = new Timer(100,this);
    //构造器
    public GamePanel(){
        init();
        //获得焦点和键盘事件
        this.setFocusable(true);//焦点事件
        this.addKeyListener(this);//获得键盘监听事件
        timer.start();
    }
    //初始化方法
    public void init(){
        length = 3;
        snakeX[0] = 100;snakeY[0] = 100;//脑袋
        snakeX[1] = 75;snakeY[1] = 100;//第一节身体
        snakeX[2] = 50;snakeY[2] = 100;//第二节身体
        dir = "R";//初始化方向向右
        foodx = 25+25*random.nextInt(34);
        foody = 75+25*random.nextInt(24);
        score=0;
    }
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        this.setBackground(Color.white);
        Data.header.paintIcon(this,g,25,11);//头部广告栏
        g.fillRect(25,75,850,600);//默认游戏界面
        g.setColor(Color.white);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("长度:"+length,750,35);
        g.drawString("分数:"+score,750,50);
        Data.food.paintIcon(this,g,foodx,foody);
        //画小蛇身体
        for(int i = 1; i < length; i++){
            Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
        }
        //游戏状态
        if(isStart==false){
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("按下空格开始游戏",300,300);
        }
        if(isFail==true){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("游戏失败，按下空格重新开始",300,300);
        }
        //画小蛇头部
        if(dir.equals("R")){
            Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if(dir.equals("L")){
            Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if(dir.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if(dir.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
        }
    }
    //键盘监听器
    @Override
    public void keyPressed(KeyEvent e){
        int keyCode = e.getKeyCode();//获得键盘按键
        if(keyCode==KeyEvent.VK_SPACE){
            if(isFail){
                isFail=false;
                init();
            }else{
                isStart=!isStart;
            }
            repaint();
        }
        if(keyCode==KeyEvent.VK_UP){
            dir = "U";
        }else if(keyCode==KeyEvent.VK_DOWN){
            dir="D";
        }else if(keyCode==KeyEvent.VK_LEFT){
            dir="L";
        }else if(keyCode==KeyEvent.VK_RIGHT){
            dir="R";
        }
    }
    //事件监听
    @Override
    public void actionPerformed(ActionEvent e){
        if(isStart && isFail==false){
            //吃食物
            if(snakeX[0]==foodx && snakeY[0]==foody){
                length++;
                score+=10;
                foodx = 25+25*random.nextInt(34);
                foody = 75+25*random.nextInt(24);
            }
            //移动
            for(int i=length-1;i>0;i--){
                snakeX[i]=snakeX[i-1];
                snakeY[i]=snakeY[i-1];
            }
            if(dir.equals("R")){
                snakeX[0]+=25;
                if(snakeX[0]>850){snakeX[0]=25;}
            }else if(dir.equals("L")){
                snakeX[0]-=25;
                if(snakeX[0]<25){snakeX[0]=850;}
            }else if(dir.equals("U")){
                snakeY[0]-=25;
                if(snakeY[0]<75){snakeY[0]=650;}
            }else if(dir.equals("D")){
                snakeY[0]+=25;
                if(snakeY[0]>650){snakeY[0]=75;}
            }
            //失败判定
            for(int i=1;i<length;i++){
                if(snakeX[0]==snakeX[i]&&snakeY[0]==snakeY[i]){
                    isFail=true;
                }
            }
            repaint();
        }
        timer.start();
    }
    @Override
    public void keyReleased(KeyEvent e){}
    @Override
    public void keyTyped(KeyEvent e){}
}