snake.java

游戏贪吃蛇的简单代码

import java.awt.*;
import java.applet.*;

public class Snake extends Applet implements Runnable {
	Image dot[] = new Image[400];
	Image back;
	Image offI;
	Graphics offG;
	int x[] = new int[400];
	int y[] = new int[400];
	int rtemp = 1;
	int game = 1;
	int level;
	int z;
	int n;
	int count = 0;
	int score = 0;
	int add = 1;
	Button b = new Button("Beginner");
	Button i = new Button("Intermediate");
	Button p = new Button("Professional");
	Button X = new Button("Xtreamest");
	String stemp;
	String s;
	String t;
	boolean go[] = new boolean[400];
	boolean left = false;
	boolean right = false;
	boolean up = false;
	boolean down = false;
	boolean started = false;
	boolean me = false;
	Thread setTime;

	public void init() {
		add(b);
		add(i);
		add(p);
		add(X);
		setBackground(Color.black);
		back = getImage(getCodeBase(), "screan.gif");
		for (z = 0; z < 400; z++) {
			dot[z] = getImage(getCodeBase(), "dot.gif");
		}
	}

	public void update(Graphics g) {
		Dimension d = this.size();
		if (offI == null) {
			offI = createImage(d.width, d.height);
			offG = offI.getGraphics();
		}
		offG.clearRect(0, 0, d.width, d.height);
		paint(offG);
		g.drawImage(offI, 0, 0, null);
	}

	public void paint(Graphics g) {
		g.drawImage(back, 0, 0, this);
		g.setColor(Color.white);

		// 游戏开始，显示得分
		if (started) {
			g.setFont(new Font("Verdana", 1, 12));
			t = "Score " + score + "";
			g.drawString(t, 75, 220);
		}

		// 游戏当前所处的状态为1，选择游戏模式
		if (game == 1) {
			g.setFont(new Font("Arial", 1, 13));
			s = "Set Mode";
			g.drawString(s, 65, 30);
			b.move(75, 50);
			i.move(68, 90);
			p.move(68, 130);
			X.move(73, 170);
		}

		// 游戏当前所处的状态为2或3
		if ((game == 2) || (game == 3)) {
			if (!started) {
				// 游戏未开始，显示提示信息
				g.setFont(new Font("Verdana", 1, 11));
				t = "Use the key board arrows to move!";
				g.drawString(t, 5, 215);
			}
			for (z = 0; z <= n; z++) {
				g.drawImage(dot[z], x[z], y[z], this);
			}
			me = true;
		}

		if (!me) {
			g.setFont(new Font("Verdana", 1, 11));
			t = "by ali";
			g.drawString(t, 5, 215);
		}

		// 游戏状态为3，游戏结束
		if (game == 3) {
			g.setFont(new Font("Verdana", 1, 13));
			s = "Game Over";
			g.drawString(s, 65, 60);
		}
	}

	public void run() {
		for (z = 4; z < 400; z++) {
			go[z] = false;
		}
		for (z = 0; z < 4; z++) {
			go[z] = true;
			x[z] = 91;
			y[z] = 91;
		}
		n = 3;
		game = 2;
		score = 0;
		// 将游戏难度选择按钮移除
		b.move(70, -100);
		i.move(70, -100);
		p.move(70, -100);
		X.move(70, -100);
		left = false;
		right = false;
		up = false;
		down = false;
		locateRandom(4);

		while (true) {
			if (game == 2) {
				if ((x[0] == x[n]) && (y[0] == y[n])) {
					go[n] = true;
					locateRandom((n + 1));
					score += add; // 得分更新
				}
				for (z = 399; z > 0; z--) {
					if (go[z]) {
						x[z] = x[(z - 1)];
						y[z] = y[(z - 1)];
						if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) {
							game = 3;
						}
					}
				}
				if (left) {
					x[0] -= 10;
				}
				if (right) {
					x[0] += 10;
				}
				if (up) {
					y[0] -= 10;
				}
				if (down) {
					y[0] += 10;
				}
			}

			if (y[0] > 191) {
				y[0] = 191;
				game = 3;
			}
			if (y[0] < 1) {
				y[0] = 1;
				game = 3;
			}
			if (x[0] > 191) {
				x[0] = 191;
				game = 3;
			}
			if (x[0] < 1) {
				x[0] = 1;
				game = 3;
			}

			if (game == 3) {
				if (count < (1500 / level)) {
					count++;
				} else {
					count = 0;
					game = 1;
					repaint();
					setTime.stop();
				}
			}

			repaint();
			try {
				// 根据游戏的等级level来设置线程休眠时间
				setTime.sleep(level);
			} catch (InterruptedException e) {
			}
		}
	}

	public void locateRandom(int turn) {
		rtemp = (int) (Math.random() * 20);
		x[turn] = ((rtemp * 10) + 1);
		rtemp = (int) (Math.random() * 20);
		y[turn] = ((rtemp * 10) + 1);
		n++;
	}

	// 记录哪个方向键盘被按下
	public boolean keyDown(Event e, int key) {
		// 如果按下向左键盘并且原来运动方向不是向右
		if ((key == Event.LEFT) && (!right)) {
			left = true;
			up = false;
			down = false;
			if (!started)
				started = true;
		}
		if ((key == Event.RIGHT) && (!left)) {
			right = true;
			up = false;
			down = false;
			if (!started)
				started = true;
		}
		if ((key == Event.UP) && (!down)) {
			up = true;
			right = false;
			left = false;
			if (!started)
				started = true;
		}
		if ((key == Event.DOWN) && (!up)) {
			down = true;
			right = false;
			left = false;
			if (!started)
				started = true;
		}
		return true;
	}

	// 根据用户不同的难度选择设置不同的游戏参数
	public boolean action(Event event, Object obj) {
		stemp = (String) obj;

		if (stemp.equals("Beginner")) {
			add = 2;
			level = 100;
			setTime = new Thread(this);
			setTime.start();
			return true;
		}

		if (stemp.equals("Intermediate")) {
			add = 5;
			level = 70;
			setTime = new Thread(this);
			setTime.start();
			return true;
		}

		if (stemp.equals("Professional")) {
			add = 10;
			level = 40;
			setTime = new Thread(this);
			setTime.start();
			return true;
		}

		if (stemp.equals("Xtreamest")) {
			add = 20;
			level = 20;
			setTime = new Thread(this);
			setTime.start();
			return true;
		}
		return false;
	}
}