Libgdx 有一个 body 没有精灵

Question

    int amoumt = 10;
    int i = 1;
    while (i < amoumt+1)
            {
                    box(1);//body
                    i++;
            }

如果我使用这种方法，我会得到 9 个有精灵的身体和一个 body 没有精灵的身体。但是我在所有这些上都画了一个精灵

在渲染方法中，用于在 each 上绘制精灵 body:

batch.begin();
                            world.getBodies(worldBodies);
                            for (Body body : worldBodies) {
                            if (body.getUserData() instanceof Sprite) {
                            Sprite sprite = (Sprite) body.getUserData();
                            Vector2 position = body.getPosition();
                            sprite.setPosition(position.x - sprite.getWidth() / 2,position.y - sprite.getHeight() / 2);
                            sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees);
                            sprite.draw(batch);
                            }
                            }
                            batch.end();
                        }

Body:

private Body box(float a) 
                    {
                            BodyDef bodyDef = new BodyDef();
                            bodyDef.position.set(0,0);
                            bodyDef.type = BodyType.DynamicBody;
                            PolygonShape polygonShape=new PolygonShape();
                            polygonShape.setAsBox(a,a);
                            FixtureDef fixtureDef = new FixtureDef();
                            fixtureDef.shape=polygonShape;
                            fixtureDef.density=2;
                            fixtureDef.restitution=0.5f;
                            fixtureDef.friction=0.5f;
                            Body box=world.createBody(bodyDef);
                            box.createFixture(fixtureDef);
                            box.setUserData(sprite);
                            sprite = new Sprite(new Texture("android.jpg"));
                            sprite.setSize(a*2,a*2);
                            sprite.setOrigin(sprite.getWidth() / 2, sprite.getHeight() / 2);
                            worldBodies = new Array<Body>();

                            return box;
                    }

Answer 1

据我所知，您设置为用户数据的 sprite 在您创建第一个盒子时并未初始化。在将用户数据设置为精灵之前尝试移动 sprite = new sprite 初始化行。

Answer 2

我想这会解决你的问题

private Body box(float a) 
{
        BodyDef bodyDef = new BodyDef();
        bodyDef.position.set(0,0);
        bodyDef.type = BodyType.DynamicBody;
        PolygonShape polygonShape=new PolygonShape();
        polygonShape.setAsBox(a,a);
        FixtureDef fixtureDef = new FixtureDef();
        fixtureDef.shape=polygonShape;
        fixtureDef.density=2;
        fixtureDef.restitution=0.5f;
        fixtureDef.friction=0.5f;
        Body box=world.createBody(bodyDef);
        box.createFixture(fixtureDef);
        sprite = new Sprite(new Texture("android.jpg"));
        sprite.setSize(a*2,a*2);
        sprite.setOrigin(sprite.getWidth() / 2, sprite.getHeight() / 2);
        box.setUserData(sprite);
        worldBodies = new Array<Body>();

        return box;
}

希望对您有所帮助！

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