java如何使具有纹理的libgdx精灵与box2d主体同时创建？

Question

我已经研究这个问题一段时间了，决定在这个问题上寻求帮助。

总结：
我有一个bullet类，它扩展了Actor，还有一个makeBullet方法，它生成了box2d主体和固定装置。
在我的bullet类的draw方法中，我有一个if/else语句，检查我的shootButton是否被按下，如果被按下，调用makeBullet方法，用纹理创建一个新的Sprite，将位置设置为box2d子弹，并对我的子弹应用线性脉冲

问题：
只有当我按下shootButton键时，精灵的纹理才会出现，并且只出现在播放器旁边，但是box2d子弹似乎工作正常。如何将图像附加到每个项目符号

对不起，如果我不太清楚，我很乐意进一步详细解释或给出更多代码

bullet类：

package com.mygdx.game;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;
import com.badlogic.gdx.scenes.scene2d.Actor;

import static com.badlogic.gdx.physics.box2d.BodyDef.BodyType.DynamicBody;

public class bullet extends Actor{
    static BodyDef bodyDef;
    static Body body;
    static FixtureDef fixtureDef;
    static PolygonShape groundBox;
    Sprite bulletThing;

    //method that makes box2d bullet bodies, takes world and direction from main class, MyGdxGame
    public static void makeBullet(World world, int direction) {
        //makes body def
        bodyDef = new BodyDef();
        bodyDef.type = DynamicBody;
        // sets bullet at player (MyActor)'s location
        bodyDef.position.set(MyActor.body.getPosition().x, MyActor.body.getPosition().y);
        // put body in the world
        body = world.createBody(bodyDef);
        // makes fixture for bullet body
        fixtureDef = new FixtureDef();
        groundBox = new PolygonShape();
        fixtureDef.shape = groundBox;
        fixtureDef.density = 0.9f;
        fixtureDef.friction = 0.6f;
        fixtureDef.restitution = 0.1f; 
        groundBox.setAsBox(1f, 1f);
        // attach fixture to body
        body.createFixture(fixtureDef);
    }

    @Override
    public void draw(Batch batch, float parentAlpha) {
        super.draw(batch, parentAlpha);

        if (MyGdxGame.shootButton.isPressed()) {  // if my shootButton is pressed
            //makes a bullet, takes the direction from main class
            bullet.makeBullet(MyGdxGame.world, MyGdxGame.direction);
            // makes texture for sprite
            Pixmap pixmap = new Pixmap(1, 1, Pixmap.Format.RGBA8888);
            pixmap.setColor(Color.WHITE);
            pixmap.fill();
            bulletThing = new Sprite(new Texture(pixmap));
            // sets sprite texture to box2d bullet, supposedly
            bulletThing.setBounds(bullet.body.getPosition().x - bulletThing.getWidth()/2, bullet.body.getPosition().y - bulletThing.getHeight()/2, 4f, 4f);
            bulletThing.setRotation(MathUtils.radiansToDegrees * bullet.body.getAngle());
            bulletThing.setOriginCenter();
            bulletThing.draw(batch);
            //fires the bullet
            body.applyLinearImpulse(MyGdxGame.direction * 1f,0,body.getWorldCenter().x, body.getWorldCenter().y, true);
        }        
    }       
}

如果需要，可以使用主类。谢谢你的帮助