如何在libgdx/android中移动圆圈？

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;

public class MyGame extends ApplicationAdapter implements InputProcessor {
    private ShapeRenderer shapeRenderer;
    private float circleX, circleY;
    private float circleRadius;
    private Color circleColor;

    @Override
    public void create() {
        shapeRenderer = new ShapeRenderer();
        Gdx.input.setInputProcessor(this);

        circleX = Gdx.graphics.getWidth() / 2; // 初始圆心X坐标为屏幕中心
        circleY = Gdx.graphics.getHeight() / 2; // 初始圆心Y坐标为屏幕中心
        circleRadius = 50; // 圆的半径
        circleColor = Color.RED; // 圆的颜色
    }

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

        shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
        shapeRenderer.setColor(circleColor);
        shapeRenderer.circle(circleX, circleY, circleRadius);
        shapeRenderer.end();
    }

    @Override
    public boolean touchDragged(int screenX, int screenY, int pointer) {
        circleX = screenX;
        circleY = Gdx.graphics.getHeight() - screenY; // 坐标系转换，将Y坐标反转
        return true;
    }

    // 其他InputProcessor接口方法省略...

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