package demo;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Snake extends JFrame implements Runnable{
	int x = 300;
	int y = 300;
	int x1 = 350;
	int y1 = 350;
	int mx = 10;
	int my = 0;
	int interval=400;
	int speed;
	int score;
	int time;
	boolean isRun;
	boolean paintFood;
	LinkedList<MySnake>snake = new LinkedList<MySnake>();
	JMenuBar bar = new JMenuBar();
	JLabel jl1 = new JLabel("                         速度级别：");
	JLabel jl2 = new JLabel();
	JLabel jl3 = new JLabel("        分数：");
	JLabel jl4 = new JLabel();
	JLabel jl0 = new JLabel("提示：按空格键开始/暂停游戏");
	JMenu jm1 = new JMenu("菜单");
	JMenu jm2 = new JMenu("帮助");
	JMenuItem[] jmi=new JMenuItem[4]; 
	public Snake(){
		//添加蛇体
		snake.add(new MySnake(x,y));
		snake.add(new MySnake(x-10,y));
		snake.add(new MySnake(x-20,y));
		snake.add(new MySnake(x-30,y));
		snake.add(new MySnake(x-40,y));
		//添加菜单条上的组件
		jmi[0] = new JMenuItem("重新开始");
		jmi[1] = new JMenuItem("退出");
		jmi[2] = new JMenuItem("玩法");
		jmi[3] = new JMenuItem("关于");
		jl1.setForeground(Color.magenta);
		jl2.setForeground(Color.green);
		jl3.setForeground(Color.magenta);
		jl4.setForeground(Color.green);
		jm1.add(jmi[0]);
		jm1.add(jmi[1]);
		jm2.add(jmi[2]);
		jm2.add(jmi[3]);
		bar.add(jm1);
		bar.add(jm2);
		bar.add(jl1);
		bar.add(jl2);
		bar.add(jl3);
		bar.add(jl4);
		setJMenuBar(bar);
		//添加提示标签
		setLayout(null);
		jl0.setBounds(260,0,180,30);
		jl0.setForeground(Color.red);
		add(jl0);
		for(int i=0;i<4;i++){
			jmi[i].addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent e){
					if(e.getSource()==jmi[0]){
						Thread t = new Thread(new Snake());
						t.start();
					}
					if(e.getSource()==jmi[1]){
						System.exit(0);
					}
					if(e.getSource()==jmi[2]){
						JOptionPane.showMessageDialog(null,"玩法：吃掉绿色食物让蛇变得更长，以此获得更高的得分！");
					}
					if(e.getSource()==jmi[3]){
						JOptionPane.showMessageDialog(null,"作者：杨卓");
					}
				}
			});
		}
		addKeyListener(new KeyAdapter(){
			public void keyPressed(KeyEvent e){
				if(e.getKeyCode()==KeyEvent.VK_UP&&my==0){
					mx = 0;
					my = -10;
				}
				if(e.getKeyCode()==KeyEvent.VK_DOWN&&my==0){
					mx = 0;
					my = 10;
				}
				if(e.getKeyCode()==KeyEvent.VK_LEFT&&mx==0){
					mx = -10;
					my = 0;
				}
				if(e.getKeyCode()==KeyEvent.VK_RIGHT&&mx==0){
					mx = 10;
					my = 0;
				}
				/*if(e.getKeyCode()==KeyEvent.VK_PAGE_UP){
					interval-=20;
					speed++;
				}
				if(e.getKeyCode()==KeyEvent.VK_PAGE_DOWN){
					interval+=20;
					speed--;
				}*/
				if(e.getKeyCode()==KeyEvent.VK_SPACE){
					if(isRun==true){
						isRun = false;
					}else{
						isRun = true;
					}
				}
			}
		});
		setTitle("玩蛇");
		setSize(700,700);
		setLocation(350,20);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
	}
	public void paint(Graphics g){
		super.paint(g);
		//画蛇体
		for(int i=0;i<snake.size();i++){
			MySnake ms1 = snake.get(i);
			g.setColor(Color.red);
			g.fillOval(ms1.x,ms1.y,10,10);
		}
		//蛇头为蓝色
		g.setColor(Color.blue);
		g.fillOval(snake.getFirst().x,snake.getFirst().y,10,10);
		//画食物
		g.setColor(Color.green);
		while(paintFood){
			x1=(int)(10+Math.random()*50)*10;
			y1=(int)(10+Math.random()*50)*10;
			int i;
			for(i=0;i<snake.size();i++){
				if(x1==snake.get(i).x&&y1==snake.get(i).y){
					break;
				}
			}
			if(i==snake.size()){
				paintFood = false;
			}
		}
		g.fillOval(x1,y1,10,10);
		//画墙体
		g.setColor(Color.orange);
		for(int i=90;i<=100;i+=2){
			g.drawRect(i,i,700-2*i,700-2*i);
		}
	}
	public void run(){
		while(true){
			if(isRun){
				MySnake ms = snake.getFirst();
				snake.addFirst(new MySnake(ms.x+mx,ms.y+my));
				MySnake ms2 = snake.getFirst();
				speed = 1+score/50;
				interval = 400-80*score/50;
				jl2.setText(""+speed);
				jl4.setText(""+score);
				if(ms2.x==x1&&ms2.y==y1){
					score+=10;
					paintFood = true;
				}else{
					snake.removeLast();
				}
				for(int i=1;i<snake.size();i++){
					MySnake ms3=snake.get(i);
					//咬到自己，游戏结束
					if(ms2.x==ms3.x&&ms2.y==ms3.y){
						JOptionPane.showMessageDialog(null,"GameOver!");
						return;
					}
				}
				if(ms2.x<100||ms2.x>590||ms2.y<100||ms2.y>590){
					//碰到墙壁，游戏结束
					JOptionPane.showMessageDialog(null,"GameOver!");
					break;
				}
			}
			repaint();
			try{
				Thread.sleep(interval);
			}catch(Exception e){}
		}
	}
	public static void main(String[] args){
		Thread t = new Thread(new Snake());
		t.start();
	}
}
class MySnake{
	int x;
	int y;
	public MySnake(int x,int y){
		this.x=x;
		this.y=y;
	}
}