Question

我正在编写游戏，并且我在上面使用带box2D库的libGDX。我有一个问题。如您所知，CircleShape .setPosition（）有一个用于定位形状的函数，我正在使用它在该形状中设置精灵，如下图所示：

在这里我正在创建该形状，如您所见，有一个函数“ setPosition”可以根据我的精灵来适应形状：

    CircleShape ballShape = new CircleShape();
    ballShape.setPosition(new Vector2(-1.5f, 0f)); //Here i set the position 
                                              //of the shape
    ballShape.setRadius(1.5f);

    // fixture definition
    fixtureDef.shape = ballShape;
    fixtureDef.density = 0f; 
    fixtureDef.friction = 0; 
    fixtureDef.restitution = 0; 
    playerCircle = world.createBody(bodyDef); 
    playerCircle.createFixture(fixtureDef);
    ballShape.dispose();

在这里，我根据CircleShape绘制了精灵：

        batch.begin();
        boxSprite = new Sprite(new Texture(
                "C:/Users/HOME/Desktop/videoGameGit/videogameGit/box2DExample-android/assets/data/sprites/player/ak47stand.png"));
        boxSprite.setSize(5.5f, 5.5f);
        boxSprite.setOrigin(boxSprite.getWidth() / 2, boxSprite.getHeight() / 2);
        playerCircle.setUserData(boxSprite);
        world.getBodies(tmpBodies);
        for (Body body : tmpBodies)

            if (body.getUserData() != null && body.getUserData() instanceof Sprite) {

                Sprite sprite = (Sprite) body.getUserData();
                sprite.setPosition((body.getPosition().x - sprite.getWidth() / 2),
                        (body.getPosition().y - sprite.getHeight() / 2));
                sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees);
                sprite.draw(batch);
            }
        batch.end();

此时一切正常，但是当我想使用某个polygonShape .setAsBox绘制对象时，没有可以使用的函数.setPosition。

这对我来说是个问题，因为我必须根据子画面设置形状的位置，如您在另一幅图中所看到的。精灵的位置不正确：

picture2

由于PolygonShape中没有类似于setPosition的函数，因此这是我将多边形Shape创建为Box的代码的一部分：

        bodyDef.type = BodyType.DynamicBody;
        PolygonShape chair = new PolygonShape();
        chair.setAsBox(1.3f, 1.4f, new Vector2(x, y), 0);
        fixtureDef.shape = chair;
        fixtureDef.density = 10f;
        fixtureDef.friction = 10;
        fixtureDef.restitution = 0f;
        body = world.createBody(bodyDef);
        body.createFixture(fixtureDef);
        body.setAngularDamping(5);
        body.setLinearDamping(8);
        chair.dispose();

我在这里绘制它：

    batch.begin();
    sprite.setSize(5.5f, 5.5f);
    sprite.setOrigin(sprite.getWidth() / 2, sprite.getHeight() / 2);
    body.setUserData(sprite);
    world.getBodies(tmpBodies);
    for (Body body : tmpBodies)

        if (body.getUserData() != null && body.getUserData() instanceof Sprite) {

            Sprite sprite = (Sprite) body.getUserData();
            sprite.setPosition((body.getPosition().x - sprite.getWidth() / 2),
                    (body.getPosition().y - sprite.getHeight() / 2));
            sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees);
            sprite.draw(batch);
        }
    batch.end();

我的问题是，有一种方法可以正确地将多角形与精灵配合？我希望有人能帮助我。

谢谢！。

在多边形形状box2D

0 个答案: