java - Java 游戏中的 key 管理器

Question

我正在用 Java 创建一个游戏，但在按下空格键时尝试发射的射弹出现问题。我有一个关于如何执行此操作的想法，但我遇到了问题。

public class GameState extends State{

private Player player;
private World world;
private Bullet bullet;


public GameState(Game game){
    super(game);
    player = new Player(game, 420, 420);
    world = new World(game, "res/worlds/world1.txt");
    bullet = new Bullet(game, 420, 420, 0, 0);

}



@Override
public void tick() {
    world.tick();
    bullet.tick();
    player.tick();


    while(game.getKeyManager().keyPressed(e)){
    bullet.setX(player.getX());
    bullet.setY(player.getY());
    }
}

@Override
public void render(Graphics g) {

    final int height = 64, width = 64;


    world.render(g);
    bullet.render(g);
    player.render(g);



    }



}

<strong>while(game.getKeyManager().keyPressed(e)){</strong>给我带来了 e 下的红线问题。它无法解析为变量，但老实说我不知道​​如何处理它。这也是我的 KeyManager 代码。

public class KeyManager implements KeyListener{

private boolean[] keys;
public boolean up, down, left, right, action;


public KeyManager(){
    keys = new boolean[256];

}


public void tick(){

    up = keys[KeyEvent.VK_W];
    down = keys[KeyEvent.VK_S];
    left = keys[KeyEvent.VK_A];
    right = keys[KeyEvent.VK_D];
    action = keys[KeyEvent.VK_SPACE];


}


@Override
public void keyPressed(KeyEvent e) {
    keys[e.getKeyCode()] = true;
    System.out.println("Pressed");

}


@Override
public void keyReleased(KeyEvent e) {
    keys[e.getKeyCode()] = false;


}


@Override
public void keyTyped(KeyEvent e) {


}


public boolean[] getKeys() {
    return keys;
}


public void setKeys(boolean[] keys) {
    this.keys = keys;
}

}

老实说，我不知道我做错了什么，因为我相对较新。如果您碰巧有一个比我的想法更好的射弹发射编码源，请链接它!我需要帮助!

Answer 1

使用键绑定(bind)比使用键监听器要容易得多。

以下是贪吃蛇游戏(如 Atari 贪吃蛇游戏)上下文中的一些键绑定(bind)。关键方法(双关语)是 setKeyBindings 方法。您可以将空格键添加到这些键绑定(bind)中。

package com.ggl.snake.game.view;

import java.awt.Point;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.NumberFormat;

import javax.swing.BoxLayout;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

import com.ggl.snake.game.controller.ArrowAction;
import com.ggl.snake.game.model.SnakeGameModel;
import com.ggl.snake.game.runnable.GameRunnable;

public class SnakeGameFrame {

    private static final NumberFormat NF = NumberFormat.getInstance();

    private ControlPanel controlPanel;

    private GameRunnable gameRunnable;

    private GridPanel gridPanel;

    private JFrame frame;

    private SnakeGameModel model;

    public SnakeGameFrame(SnakeGameModel model) {
        this.model = model;
        createPartControl();
    }

    private void createPartControl() {
        frame = new JFrame();
        // frame.setIconImage(getFrameImage());
        frame.setTitle("Retro Snake Game");
        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent event) {
                exitProcedure();
            }
        });

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.LINE_AXIS));

        gridPanel = new GridPanel(model);
        mainPanel.add(gridPanel);

        controlPanel = new ControlPanel(this, model);
        mainPanel.add(controlPanel.getPanel());

        frame.add(mainPanel);
        frame.pack();

        setKeyBindings(gridPanel);

        frame.setLocationByPlatform(true);
        frame.getRootPane().setDefaultButton(controlPanel.getStartButton());
        frame.setVisible(true);

        gameRunnable = new GameRunnable(this, model);
        new Thread(gameRunnable).start();
    }

    private void setKeyBindings(JPanel gridPanel) {
        InputMap inputMap = gridPanel
                .getInputMap(JPanel.WHEN_IN_FOCUSED_WINDOW);
        inputMap.put(KeyStroke.getKeyStroke("W"), "up arrow");
        inputMap.put(KeyStroke.getKeyStroke("S"), "down arrow");
        inputMap.put(KeyStroke.getKeyStroke("A"), "left arrow");
        inputMap.put(KeyStroke.getKeyStroke("D"), "right arrow");

        inputMap.put(KeyStroke.getKeyStroke("UP"), "up arrow");
        inputMap.put(KeyStroke.getKeyStroke("DOWN"), "down arrow");
        inputMap.put(KeyStroke.getKeyStroke("LEFT"), "left arrow");
        inputMap.put(KeyStroke.getKeyStroke("RIGHT"), "right arrow");

        inputMap = gridPanel.getInputMap(JPanel.WHEN_FOCUSED);
        inputMap.put(KeyStroke.getKeyStroke("UP"), "up arrow");
        inputMap.put(KeyStroke.getKeyStroke("DOWN"), "down arrow");
        inputMap.put(KeyStroke.getKeyStroke("LEFT"), "left arrow");
        inputMap.put(KeyStroke.getKeyStroke("RIGHT"), "right arrow");

        gridPanel.getActionMap().put("up arrow",
                new ArrowAction(model, new Point(0, -1)));
        gridPanel.getActionMap().put("down arrow",
                new ArrowAction(model, new Point(0, 1)));
        gridPanel.getActionMap().put("left arrow",
                new ArrowAction(model, new Point(-1, 0)));
        gridPanel.getActionMap().put("right arrow",
                new ArrowAction(model, new Point(1, 0)));
    }

    private void exitProcedure() {
        gameRunnable.setRunning(false);
        frame.dispose();
        System.exit(0);
    }

    public void repaintGridPanel() {
        gridPanel.repaint();
    }

    public void setScoreText() {
        controlPanel.setScoreText(NF.format(model.getScore()));
    }

    public void setPauseButton() {
        controlPanel.setPauseButton(model.isGameActive());
    }
}