貪吃蛇

執妄發表於2020-11-21

主啟動類

package snake;

import javax.swing.*;

/**
 * 遊戲的主啟動類
 */
public class StartSnake {
    public static void main(String[] args) {
        JFrame frame = new JFrame();

        frame.setBounds(10, 10, 900, 720);
        frame.setResizable(false);   //視窗大小不可變
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //正常遊戲頁面在皮膚上
        frame.add(new GamePanel());

        frame.setVisible(true);

    }
}

遊戲皮膚

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;

/**
 * 遊戲皮膚
 */
public class GamePanel extends JPanel implements KeyListener, ActionListener {

    //定義蛇的資料結構
    int length;  //蛇的長度
    int[] snakeX = new int[600];   //蛇的X座標
    int[] snakeY = new int[500];   //蛇的Y座標
    String toward;

    //食物的座標
    int foodx;
    int foody;
    Random random = new Random();

    //成績
    int score;

    //遊戲當前的狀態
    boolean isStart = false;   //預設是不開始

    boolean isFail = false;  //遊戲失敗狀態

    //定時器
    Timer timer = new Timer(100,this);   //100毫秒執行一次

    //構造器
    public GamePanel(){
        init();
        //獲得焦點和鍵盤事件
        this.setFocusable(true);  //獲得焦點事件
        this.addKeyListener(this);   //獲得鍵盤監聽事件
        timer.start();  //遊戲一開啟定時器就啟動
    }

    public void init(){
        length = 3;
        snakeX[0] = 100;  snakeY[0] = 100;
        snakeX[1] = 75;  snakeY[1] = 100;
        snakeX[2] = 50;  snakeY[2] = 100;
        toward = "R";

        //把食物隨機分佈在介面上
        foodx = 25 + 25 * random.nextInt(34);
        foody = 75 + 25 * random.nextInt(24);

        score = 0;
    }

    //繪製皮膚，所有的東西都用這個畫筆來畫
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        //繪製靜態的皮膚
        this.setBackground(Color.WHITE);
        Data.header.paintIcon(this, g, 25, 11);  //頭部廣告欄
        g.fillRect(25, 75, 850, 600);  //預設的遊戲介面

        //畫積分
        g.setColor(Color.white);
        g.setFont(new Font("微軟雅黑", Font.BOLD, 18));
        g.drawString("長度" + length, 750, 35);
        g.drawString("分數" + score, 750, 50);

        //畫食物
        Data.food.paintIcon(this,g,foodx,foody);

        //把小蛇畫上去
        if(toward.equals("R")){
            Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);  //蛇頭初始化向右
        }else if(toward.equals("L")){
            Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);  //蛇頭初始化向左
        } else if (toward.equals("U")) {
            Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);  //蛇頭初始化向上
        } else if (toward.equals("D")) {
            Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);  //蛇頭初始化向下
        }


        for(int i=1; i<length; i++){
            Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);  //第一個身體的座標
        }

        //遊戲狀態
        if(isStart==false){
            g.setColor(Color.WHITE);
            g.setFont(new Font("微軟雅黑", Font.BOLD, 40));
            g.drawString("按下空格開始遊戲", 300, 300);
        }

        if(isFail){
            g.setColor(Color.RED);
            g.setFont(new Font("微軟雅黑", Font.BOLD, 40));
            g.drawString("失敗，按下空格重新開始遊戲", 300, 300);
        }

    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    //鍵盤監聽事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();  //獲得鍵盤按的是哪個鍵

        if (keyCode == KeyEvent.VK_SPACE) {
            if(isFail){
                //重新開始
                isFail =false;
                init();
            }else {
                isStart = !isStart;
            }
            repaint();
        }
        //小蛇移動
        if(keyCode == KeyEvent.VK_UP){
            toward = "U";
        } else if (keyCode == KeyEvent.VK_DOWN) {
            toward = "D";
        } else if (keyCode == KeyEvent.VK_LEFT) {
            toward = "L";
        } else if (keyCode == KeyEvent.VK_RIGHT) {
            toward = "R";
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {}

    //事件監聽
    @Override
    public void actionPerformed(ActionEvent e) {
        if(isStart && isFail == false){ //如果遊戲是開始狀態，就讓小蛇動起來

            //吃食物
            if(snakeX[0] == foodx && snakeY[0] == foody){
                length++;   //長度+1
                score += 10;
                //再次隨機食物
                foodx = 25 + 25 * random.nextInt(34);
                foody = 75 + 25 * random.nextInt(24);
            }

            //移動
            for(int i = length-1; i>0; i--){
                snakeX[i] = snakeX[i-1];
                snakeY[i] = snakeY[i-1];
            }

            //走向
            if(toward.equals("R")){
                snakeX[0] = snakeX[0] + 25;
                //邊界判斷
                if(snakeX[0]>850){
                    snakeX[0] = 25;
                }
            } else if (toward.equals("L")) {
                snakeX[0] = snakeX[0] - 25;
                //邊界判斷
                if(snakeX[0]<25){
                    snakeX[0] = 850;
                }
            } else if (toward.equals("U")) {
                snakeY[0] = snakeY[0] - 25;
                //邊界判斷
                if(snakeY[0]<75){
                    snakeY[0] = 650;
                }
            } else if (toward.equals("D")) {
                snakeY[0] = snakeY[0] + 25;
                //邊界判斷
                if(snakeY[0]>650){
                    snakeY[0] = 75;
                }
            }

            //失敗判斷，撞到自己就算失敗
            for(int i=1; i<length; i++){
                if(snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                    isFail = true;
                }
            }

            repaint();
        }
        timer.start();
    }
}

資料中心

package snake;

import javax.swing.*;
import java.net.URL;

/**
 * 資料中心
 */
public class Data {
    //絕對路徑   /  相當於當前的專案
    public static URL headerURL = Data.class.getResource("static/header.png");
    public static ImageIcon header = new ImageIcon(headerURL);

    public static URL upURL = Data.class.getResource("static/up.png");
    public static URL downURL = Data.class.getResource("static/down.png");
    public static URL leftURL = Data.class.getResource("static/left.png");
    public static URL rightURL = Data.class.getResource("static/right.png");
    public static ImageIcon up = new ImageIcon(upURL);
    public static ImageIcon down = new ImageIcon(downURL);
    public static ImageIcon left = new ImageIcon(leftURL );
    public static ImageIcon right = new ImageIcon(rightURL);

    public static URL bodyURL = Data.class.getResource("static/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);

    public static URL foodURL = Data.class.getResource("static/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);

}

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