8.随机产生敌机并下落

1.敌机类
public class EnemyAirplane extends FlySprite implements ActionSprite {

//敌机类型<br />    private int type;<br />    //飞机下落的速度<br />    private int speed;<br />    //飞机的血量<br />    private int blood;<br />    //分值<br />    private int score;
public EnemyAirplane() {<br />        this.init();<br />    }
@Override<br />    public void init() {<br />        //创建随机对象<br />        Random random = new Random();<br />        //1-10；<br />        int i = random.nextInt(10) + 1;<br />        //1:3:6:生成不同的飞机<br />        if (i % 10 == 0) {<br />            type = 2;<br />        } else {<br />            //369<br />            if (i % 3 == 0) {<br />                type = 1;<br />            } else {<br />                type = 0;<br />            }<br />        }<br />        //根据飞机类型不通，速度也不同<br />        speed = 5 - type;<br />        if (type == 2) {<br />            score = blood = 10;<br />        } else {<br />            if (type == 1) {<br />                score = blood = 5;<br />            } else {<br />                score = blood = 1;<br />            }<br />        }<br />        //根据飞机的类型，加载相应的图片<br />        super.image = ImageLoaderUtil._load_("enemy"+type+".png");<br />        super.width = super.image.getWidth()/2;<br />        super.height = super.image.getHeight()/2;<br />        //x,y<br />        //敌机从屏幕外进入，因此y轴设定为敌机的负高度<br />        super.y = -super.height;<br />        // 随机敌机的X轴<br />        super.x =random.nextInt(FlyFrame._WIDTH_-super.width);<br />    }
@Override<br />    public void destroy() {<br />        FlyPanel._enemyAirplaneList_.remove(this);<br />    }
@Override<br />    public void down() {<br />        super.y = super.y+speed;<br />        if(super.y>FlyFrame._HEIGHT_){<br />            this.destroy();<br />        }<br />    }<br />}

1.敌机定时器
//敌机的集合，
public static CopyOnWriteArrayList enemyAirplaneList = new CopyOnWriteArrayList<>();

@Override
public void paint(Graphics g) {
g.drawImage(background, x, y, bgWidth, bgHeight, null);
paintState(g);
hero.draw(g);
for (Bullet bullet : bulletList) {
bullet.draw(g);
bullet.up();
}
for (EnemyAirplane enemyAirplane : enemyAirplaneList) {
enemyAirplane.draw(g);
enemyAirplane.down();
}
}

//敌机的定时任务
class EnemyTask extends TimerTask {

@Override<br />    public void run() {<br />        EnemyAirplane enemyAirplane = new EnemyAirplane();<br />        _enemyAirplaneList_.add(enemyAirplane);<br />        //重绘<br />        repaint();<br />    }<br />}

super.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
switch (gameState) {
//当游戏状态是START 点击 变成RUNNING
case START:
gameState = GameState.RUNNING;
bgRoll = new BgRoll();
shootTask = new ShootTask();
enemyTask = new EnemyTask();
timer.schedule(bgRoll, 0, 50);
timer.schedule(shootTask, 0, 200);
timer.schedule(enemyTask, 0, 1000);
break;
case RUNNING:
gameState = GameState.PAUSE;
bgRoll.cancel();
shootTask.cancel();
enemyTask.cancel();
repaint();
break;
case PAUSE:
gameState = GameState.RUNNING;
bgRoll = new BgRoll();
shootTask = new ShootTask();
enemyTask = new EnemyTask();
timer.schedule(bgRoll, 0, 50);
timer.schedule(shootTask, 0, 200);
timer.schedule(enemyTask, 0, 1000);
break;
case GAME_OVER:
gameState = GameState.START;
break;
}
}
});