在LibGDX中使用触摸板仅以45°的步幅移动播放器

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class MyGame extends ApplicationAdapter {
    private SpriteBatch batch;
    private Texture playerTexture;
    private Player player;

    @Override
    public void create() {
        batch = new SpriteBatch();
        playerTexture = new Texture("player.png");
        player = new Player(playerTexture, 0, 0);

        Gdx.input.setInputProcessor(new InputAdapter() {
            @Override
            public boolean touchDown(int screenX, int screenY, int pointer, int button) {
                // 获取触摸点相对于播放器当前位置的角度
                float angle = MathUtils.atan2(screenY - player.getY(), screenX - player.getX());

                // 计算触摸点相对于播放器当前位置的水平和垂直方向上的位移
                float deltaX = MathUtils.cos(angle) * 45;
                float deltaY = MathUtils.sin(angle) * 45;

                // 更新播放器的位置
                player.setPosition(player.getX() + deltaX, player.getY() + deltaY);

                return true;
            }
        });
    }

    @Override
    public void render() {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        batch.begin();
        batch.draw(playerTexture, player.getX(), player.getY());
        batch.end();
    }

    @Override
    public void dispose() {
        batch.dispose();
        playerTexture.dispose();
    }
}