如何将SpaceManager的cShape存储在类似数组的东西中?

我正在尝试用Cocos2d和花栗鼠(通过SpaceManager)创建一个软球,用一堆矩形链在一起,然后用弹簧连接到一个中心体。

Something like these examples

但为了做到这一点,我想我需要在创建完所有cpshape之后将它们存储在一个数组中,这样我就可以通过数组循环,用约束将它们链接在一起。

然而,当我尝试将cpshape放入数组时,我得到一个错误,告诉我这是一个“不兼容的指针类型”。所以。。。我要么需要使用数组以外的东西(我试过一个集合,它也不起作用),要么我需要对形状做些什么使它兼容。。。但是什么?或者我需要另一个办法。

有什么想法吗?

- (id) init
{

    if ( (self = [super init]) ) {

        SpaceManager * spaceMgr = [[SpaceManager alloc] init];
        [spaceMgr addWindowContainmentWithFriction:1.0 elasticity:1.0 inset:cpv(5, 5)];

            // This is a layer that draws all the chipmunk shapes
        ChipmunkDrawingLayer *debug = [[ChipmunkDrawingLayer node] initWithSpace:spaceMgr.space];
        [self addChild:debug];

        int ballPeices = 10; // the number of peices I want my ball to be composed of
        int ballRadius = 100;
        float circum = M_PI * (ballRadius * 2);

        float peiceSize = circum / ballPeices;
        float angleIncrement = 360 / ballPeices;

        CGPoint origin = ccp(240, 160);
        float currentAngleIncrement = 0;

            NSMutableArray *peiceArray = [NSMutableArray arrayWithCapacity:ballPeices];

        for (int i = 0; i < ballPeices; i++) {

            float angleIncrementInRadians = CC_DEGREES_TO_RADIANS(currentAngleIncrement);

            float xp = origin.x + ballRadius * cos(angleIncrementInRadians);
            float yp = origin.y + ballRadius * sin(angleIncrementInRadians);

                    // This is wrong, I need to figure out what's going on here.
            float peiceRotation = atan2( origin.y - yp, origin.x - xp);

            cpShape *currentPeice = [spaceMgr addRectAt:ccp(xp, yp) mass:1 width:peiceSize height:10 rotation:peiceRotation];

            currentAngleIncrement += angleIncrement;

                    [peiceArray addObject:currentPeice]; //!! incompatible pointer type

        }



        spaceMgr.constantDt = 0.9/55.0;
        spaceMgr.gravity = ccp(0,-980);
        spaceMgr.damping = 1.0;

    }

    return self;

}