如何在LibGDX中移动形状？

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.math.Rectangle;

public class MyGame extends ApplicationAdapter {
    private ShapeRenderer shapeRenderer;
    private Rectangle rectangle;
    private float speedX = 2.0f;
    private float speedY = 1.5f;

    @Override
    public void create() {
        shapeRenderer = new ShapeRenderer();
        rectangle = new Rectangle(100, 100, 50, 50);
    }

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

        // 更新形状位置
        rectangle.x += speedX;
        rectangle.y += speedY;

        // 边界检测
        if (rectangle.x < 0 || rectangle.x + rectangle.width > Gdx.graphics.getWidth()) {
            speedX = -speedX;
        }
        if (rectangle.y < 0 || rectangle.y + rectangle.height > Gdx.graphics.getHeight()) {
            speedY = -speedY;
        }

        // 开始渲染
        shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
        shapeRenderer.rect(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
        shapeRenderer.end();
    }

    @Override
    public void dispose() {
        shapeRenderer.dispose();
    }
}