CODEWITHSUNDEEP
cocos2d-iphonebox2dphysicsbox2d-iphone
oopology
oopology

Reputation: 1072

How to destroy a body with CCPhysicsSprite

I've realized that CCPhysicsSprite is different in a few ways from CCSprite. For example, you must set the body before you set the position of the sprite. I believe it is one of these differences that is causing an EXC_BAD_ACCESS error when I try destroying the body. I call the scheduleSprite method in the update method.

-(void)scheduleSprite {

if ([testSprite physicsSprite].b2Body != NULL) {
b2Vec2 force = b2Vec2(-5, 10.0 * [testSprite physicsSprite].b2Body->GetMass());
[testSprite physicsSprite].b2Body->ApplyForce(force, [testSprite physicsSprite].b2Body->GetWorldCenter() );

if ([testSprite physicsSprite].position.x < 0) {
world->DestroyBody([testSprite physicsSprite].b2Body);
[testSprite physicsSprite].b2Body = NULL;
    }
}
}

I get an EXC_BAD_ACCESS pointing to line

b2Vec2 pos  = _b2Body->GetPosition();

in the

-(CGAffineTransform) nodeToParentTransform

method, within the class

CCPhysicsSprite.mm

Thanks.

Upvotes: 0

Views: 609

Answers (2)

AutomatonTec
AutomatonTec

Reputation: 666

- (void) killBody:(cpBody*)body
{
    cpBodyEachShape_b(body, ^(cpShape *shape) {
        cpSpaceRemoveShape( _space, shape );
        cpShapeFree(shape);
    });
    cpSpaceRemoveBody( _space, body );
    cpBodyFree(body);//edited to include this line

    CCPhysicsSprite*    sprite = (__bridge CCPhysicsSprite*) body->data;
    [sprite removeFromParentAndCleanup:true];
}

I was getting the same thing, the method above seemed to fix it. First, remove the shapes attached to the body from the space. I'm using _space as a instance variable pointing to a cpSpace object. Next, remove the body from the space. Finally, remove the sprite from the parent.

When I make a CCPhysicsSprite object, I connect its body to the sprite using body->data. You can see that in the method above.

If you are starting with a CCPhysicsSprite object, you would first get the cpBody object from the sprite, then remove the body and shape as shown above.

Upvotes: 0

ssantos
ssantos

Reputation: 16526

Despite you destroyed the body, the sprite will keep doing its stuff, so you may remove the sprite from its parent also, something like.-

if ([testSprite physicsSprite].position.x < 0) {
    world->DestroyBody([testSprite physicsSprite].b2Body);
    [[testSprite physicsSprite] removeFromParentAndCleanup:YES];
}

Upvotes: 1

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