[box2d] Getting property from userData

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[box2d] Getting property from userData

(3 posts) (2 voices)

Started 2 years ago by pabloruiz55
Latest reply from pabloruiz55

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pabloruiz55
Member

Hi! This is a simple issue i have but i can not solve it yet...

I have a class which has an atlas sprite.
When creating the box2d body/shape i add the whole instance of the class as userData (as opposite as in every example i have seen that the sprite is used as userData)

Now i would have to change the stpe function to get the atlasSprite FROM the whole class:

AtlasSprite* myActor = (AtlasSprite*)b->GetUserData();

it should be something like:
AtlasSprite* myActor = (AtlasSprite*)b->GetUserData()->mySprite;
AtlasSprite* myActor = (AtlasSprite*)b->GetUserData().mySprite;
(i get: error: request for member 'mySprite' in 'b-> b2Body::GetUserData()', which is of non-class type 'void*'
)

Neither of them works... how would i do that?

Thanks!

Posted 2 years ago #
bradparks
Member
hey... depending on the version of Box2d you're using, it may be slightly different, but something like this may work:
```
AtlasSprite *myActor = (AtlasSprite *) contact->GetFixtureA()->GetBody()->GetUserData();
```
or closer to what you had, is
```
AtlasSprite *myActor = (AtlasSprite *) b->GetUserData();
```
but I don't know if that'd work for your version or not...
Posted 2 years ago #
pabloruiz55
Member

hey bradparks, actually my userdata is the class itself, i need to get like that the sprite inside the class.

doing (AtlasSprite*)b->GetUserData() works, but brings me the whole object, i need the atlassprite inside but doing:
AtlasSprite* myActor = (AtlasSprite*)b->GetUserData()->mySprite;
AtlasSprite* myActor = (AtlasSprite*)b->GetUserData().mySprite;

yields the error i posted before.

Posted 2 years ago #

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