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WormStage.java
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165 lines (131 loc) · 3.5 KB
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package worm;
import javax.swing.*;
import java.util.*;
import java.util.Timer;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Random;
/**
* 舞台类
* @author Leslie Leung
* @see Worm
* @see Food
*/
public class WormStage extends JPanel {
public static final int ROWS = 35; //设置整个场景的行数
public static final int COLUMNS = 35; //设置整个场景的列数
private Cell food; //食物类对象
private Worm worm; //贪吃蛇类对象
private boolean on; //判断贪吃蛇游戏是开始还是暂停
private Timer timer; //定时器
private Random random = new Random();
private KeyControl keyListener; //键盘时间监听器
/**
* 构造方法，初始化贪吃蛇舞台
*/
public WormStage() {
setPreferredSize(new Dimension(ROWS * Cell.CELL_SIZE, COLUMNS * Cell.CELL_SIZE));
worm = new Worm(); //新建贪吃蛇
food = randomFood(); //新建食物
on = false;
keyListener = new KeyControl();
}
/**
* 返回KeyControl类实例
* @return KeyControl类实例
*/
public KeyControl getInnerInstanceOfKeyControl() {
return keyListener;
}
/**
* 每吃一次食物，通过减小timertask的时间间隔来加快速度
* @return 改变后的间隔值
*/
public double interval() {
return Worm.INIT_SPEED * Math.pow((double)39 / 38, Worm.DEFAULT_LENGTH - worm.getCurrentLength());
}
/**
* 建立内部类继承TimerTask，实现贪吃蛇的自动运行
* @author Leslie Leung
*
*/
private class Move extends TimerTask {
@Override
public void run() {
// TODO Auto-generated method stub
if(worm.hit(worm.getCurrentDirection())) {//判断是否产生撞击
JOptionPane.showMessageDialog(null, "你输了"); //输了提示
timer.cancel(); //取消定时器
on = false;
worm = new Worm();
food = randomFood();
} else if(worm.creep(worm.getCurrentDirection(), food)) {//调用爬行算法并判断食物是被吃，被吃的话重新生成食物
food = randomFood(); //生成食物
timer.cancel();
timer = new Timer();
timer.scheduleAtFixedRate(new Move(), 0, (long)interval()); //interval()函数用于每次吃掉食物以后加速
}
repaint();
}
}
/**
* 建立内部类继承KeyAdapter，实现对贪吃蛇的事件控制
* @author Leslie Leung
*
*/
private class KeyControl extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
switch(e.getKeyCode()) {
case KeyEvent.VK_UP: //往上爬行
worm.changeDirection(Worm.UP);
break;
case KeyEvent.VK_DOWN: //往下爬行
worm.changeDirection(Worm.DOWN);
break;
case KeyEvent.VK_LEFT: //往左爬行
worm.changeDirection(Worm.LEFT);
break;
case KeyEvent.VK_RIGHT: //往右爬行
worm.changeDirection(Worm.RIGHT);
break;
case KeyEvent.VK_SPACE: //控制游戏暂停和开始
if(on) {
/* 如果游戏开始，按空格键表示暂停 */
timer.cancel();
on = false;
break;
} else {
/* 重新创建定时器对象并调用定时器 */
timer = new Timer();
timer.scheduleAtFixedRate(new Move(), 0, (long)interval());
on = true;
break;
}
}
}
}
/**
* 随机生成食物
* @return 食物对象
*/
public Cell randomFood() {
int x, y;
do {
x = random.nextInt(COLUMNS);
y = random.nextInt(ROWS);
} while(worm.contains(x, y));
return new Cell(x, y);
}
@Override
public void paint(Graphics g) {
g.setColor(Color.BLACK);
g.fillRect(0, 0, getBounds().width, getBounds().height);
g.setColor(Color.BLUE);
worm.paint(g); //绘制贪吃蛇
g.setColor(Color.YELLOW);
food.paintCell(g); //绘制食物
}
}