如何在 java(libgdx) 中使用键盘移动精灵

Question

我正在为学校动机制作游戏，我已经制作了精灵和背景（平铺地图）我的问题是如何使用键盘使精灵向左、向右、向后和向下移动，请大家帮忙我尽快这是我的代码：

public class LEVEL1 implements ApplicationListener, Screen {
private Music music;
private SpriteBatch batch;
private Texture Sprite;
private Vector2 position;
private TiledMap map;
private OrthogonalTiledMapRenderer renderer;
private OrthographicCamera camera;

@Override
public void render(float delta) {       
    Gdx.gl.glClearColor(1, 0, 0, 0);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    position.y = position.y - 5;

    // player Controls
    if(position.y < 0){
        position.y = 0;
    }

    //..................................................

    // renderer camera and map
    camera.update();
    renderer.setView(camera);
    renderer.render();
    //...................................................

//tells the computer when to start drawing textures
    batch.begin();
    batch.draw(Sprite, position.x, position.y, 50, 50);
    batch.end();
    //...................................................

    camera = new OrthographicCamera();
    camera.setToOrtho(true, 2920,950);

}

@Override
public void show() {    
    Sprite = new Texture("Sprite.png");
    batch = new SpriteBatch();
    position = new Vector2(650, Gdx.graphics.getHeight());

    map = new TmxMapLoader().load("map1.tmx");

    renderer = new OrthogonalTiledMapRenderer(map);

    camera = new OrthographicCamera();

      music = Gdx.audio.newMusic((Gdx.files.internal("GameSound.mp3")));

        music.setLooping(false);
        music.setVolume(0.5f);
        music.play();
}

@Override
public void create() {

}

@Override
public void resize(int width, int height) {
    camera.viewportWidth = width;
    camera.viewportHeight = height;
    camera.position.set(width/2f, height/3f, 0); //by default camera position on (0,0,0)
    camera.update();


}

@Override
public void render() {
    if(Gdx.input.justTouched())
        music.play();


}

@Override
public void dispose() {
    map.dispose();
    renderer.dispose();
    music.dispose();        
}

@Override
public void hide() {
    // TODO Auto-generated method stub

}

@Override
public void pause() {
    // TODO Auto-generated method stub

}

@Override
public void resume() {
    // TODO Auto-generated method stub

}

}

Answer 1

这里我举一个使用键（上、下、左、右）移动精灵的小例子

您应该在 libgdx wiki 中找到更多详细信息

public class Level1 implements ApplicationListener {


    Sprite sprite;
    SpriteBatch batch;

    float spriteXposition;
    float spriteYposition;

    @Override
    public void render() { 

        Gdx.gl.glClearColor(1, 0, 0, 0);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        //tells the computer when to start drawing textures
        batch.begin();
        sprite.setPosition(spriteXposition, spriteYposition);
        sprite.draw(batch);
        batch.end();

        spriteControl();

    }

    public void spriteControl() {

        if(Gdx.input.isKeyPressed(Keys.UP)) {
            spriteYposition++;
        }
        if(Gdx.input.isKeyPressed(Keys.DOWN)) {
            spriteYposition--;
        }

        if(Gdx.input.isKeyPressed(Keys.LEFT)) {
            spriteXposition--;
        }

        if(Gdx.input.isKeyPressed(Keys.RIGHT)) {
            spriteXposition++;
        }
    }


    @Override
    public void create() {

        sprite = new Sprite(new Texture(Gdx.files.internal("sprite.png")));
        batch = new SpriteBatch();
    }
}

Answer 2

要对输入事件做出反应，您需要实现InputProcessor。它有keyDown（按下按键时调用）和keyUp（松开按键时调用）方法。
这些方法有一个参数keyCode，它定义了按下/释放键的 int 代码。 所以你需要重写这两种方法，并根据你得到的 keyCode，你应该做些什么。 例如，要移动播放器，您可能会保留一个成员speed，您可以根据按下/释放的键设置该成员。在 render 方法中，您需要根据经过的时间 (delta) 和 speed 更新位置。

要获取输入事件，您需要告诉 libgdx，您的 InputProcessor 应该是活动的。这是通过调用Gdx.input.setInputProcessor(yourInputProcessor) 来完成的。

另外请务必阅读Libgdx wiki，您的许多问题都会在那里得到解答。

编辑：
一些代码：

public class Level implements ApplicationListener, InputProcessor {

    private int speedX;  // Speed in x direction
    private Vector2 position;  // Position

    private boolean keyDown(int keyCode) {
        boolean result = false;
        if (keyCode == Keys.D) {
           result = true;
           speed += 5;
        }
        else if (keyCode == Keys.A) {
            result = true;
            speed -= 5;
        }
        return result;
    }

    private boolean keyUp(int keyCode) {
        boolean result = false;
        if (keyCode == Keys.D) {
           result = true;
           speed -= 5;
        }
        else if (keyCode == Keys.A) {
            result = true;
            speed += 5;
        }
        return result;
    }

    public void render(float delta) {
         position.x += speed*delta;

         // Render here
    }
}