您好，我是编程的新手，这是我第一次在这里发布文章，因此我们将不胜感激：
我的问题是我正在尝试用Java创建某种2D射击游戏，但我不知道我的简单游戏循环是否良好，因为当我射击导弹时，它每20毫秒射击一次，而且射击速度太快一次要发射一吨导弹，有什么办法可以调整它吗？
如果我的代码有问题或编程错误，请告诉我！
这是我的游戏面板，其中大部分游戏都在其中发生，并且在其中我循环并添加导弹方法
public class GamePanel extends JPanel implements KeyListener {
Measurments mesure = new Measurments();
int panel_width = mesure.getUniversalWidth();
int panel_height = mesure.getUniversalHeight();
Timer timer;
Random rand = new Random();
ArrayList<Enemy> enemies = new ArrayList<>();
ArrayList<Missile> missiles = new ArrayList<>();
Player player = new Player(0, 0);
boolean up = false;
boolean down = false;
boolean right = false;
boolean left = false;
boolean isShooting = false;
boolean isRunning = true;
public boolean gameRunning() {
return isRunning;
}
int count = 5;
int missilesCount = 6;
public GamePanel() {
timer = new Timer(20, new ActionListener() {
public void actionPerformed(ActionEvent e) {
StartGame();
repaint();
}
});
setSize(panel_width, panel_height);
addKeyListener(this);
timer.start();
for (int i = 0; i < count; i++) {
addEnemy(new Enemy(rand.nextInt(750), rand.nextInt(500)));
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
player.paint(g2d);
for (int i = 0; i < enemies.size(); i++) {
Enemy temp = enemies.get(i);
temp.paint(g2d);
}
for (int i = 0; i < missiles.size(); i++) {
Missile mis = missiles.get(i);
mis.paint(g2d);
mis.behave();
}
}
public void StartGame() {
if (isRunning) {
runGame();
setBackground(Color.YELLOW);
} else {
setBackground(Color.BLACK);
}
}
public void runGame() {
update();
};
public void update() {
player.checkBorders();
checkColls();
if (up) {
player.updateUp();
}
if (down) {
player.updateDown();
}
if (right) {
player.updateRight();
}
if (left) {
player.updateLeft();
}
if (isShooting) {
for (int i = 0; i < 5; i++) {
missiles.add(new Missile(player.getX() + 16, player.getY() + 16));
}
}
for (int i = 0; i < missiles.size(); i++) {
Missile temp = missiles.get(i);
if (temp.getX() == panel_width) {
RemoveMissile(temp);
}
}
}
public void addEnemy(Enemy e) {
enemies.add(e);
}
public void removeEnemy(Enemy e) {
enemies.remove(e);
}
public void addMissile(Missile e) {
missiles.add(e);
}
public void RemoveMissile(Missile e) {
missiles.add(e);
}
public void checkColls() {
for (int i = 0; i < enemies.size(); i++) {
Enemy tempEnm = enemies.get(i);
for (int e = 0; e < missiles.size(); e++) {
Missile tempMis = missiles.get(e);
if (tempMis.missileRect().intersects(tempEnm.enemyRect())) {
enemies.remove(tempEnm);
missiles.remove(tempMis);
}
}
}
}
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == e.VK_UP) {
up = true;
}
if (key == e.VK_DOWN) {
down = true;
}
if (key == e.VK_RIGHT) {
right = true;
}
if (key == e.VK_LEFT) {
left = true;
}
if (key == e.VK_ENTER) {
isRunning = true;
}
if (key == e.VK_SPACE) {
isShooting = true;
}
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode();
if (key == e.VK_UP) {
up = false;
}
if (key == e.VK_DOWN) {
down = false;
}
if (key == e.VK_RIGHT) {
right = false;
}
if (key == e.VK_LEFT) {
left = false;
}
if (key == e.VK_SPACE) {
isShooting = false;
}
}
public void keyTyped(KeyEvent e) {
}
}
提前致谢 ！！
最佳答案
private long fired = 0L;
public void update() {
...
// firing missiles: only if the missile count is less than the max., and the elapsed
// time is more than a limit (100 ms)
if ( isShooting && missiles.size() < missilesCount &&
( System.currentTimeMilis() - this.fired ) > 100 ) {
missiles.add( new Missile( player.getX() + 16, player.getY() + 16 ) );
// time of last firing
this.fired = System.currentTimeMilis();
}
...
}
public void RemoveMissile(Missile e) {
// as Guest is asked in another answer, this method should remove, not add...
missiles.remove(e);
}