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Chipmunk Physics • View topic - Iterating through shapes

Iterating through shapes

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Iterating through shapes

Postby divisator » Tue Jun 16, 2009 11:53 am

Hey everybody,

I've got a method that checks a given point for a specific cpBody by iterating through all bodies of the space and comparing the positions. Unfortunately I found out that I have to call cpSpaceRemoveShape and cpShapeFree to get rid of the Sprite and the assigned shape.

Could anyone tell me how to iterate through the shapes of a space (space->activeShapes I guess) so I could compare it's body property to the given body at the specific position to find out which space belongs to that body?

Thank you very much.
Have a nice day.
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Re: Iterating through shapes

Postby slembcke » Tue Jun 16, 2009 11:41 pm

Can't sleep... Chipmunks will eat me...
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Re: Iterating through shapes

Postby divisator » Fri Jun 19, 2009 11:20 am

divisator
 
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Re: Iterating through shapes

Postby divisator » Fri Jun 19, 2009 11:22 am

Hmm ... I just tried it without the cpSpaceRemoveShape - only the cpShapeFree - that seems to work ... but I have no idea what it does :-D
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Re: Iterating through shapes

Postby divisator » Fri Jun 19, 2009 11:26 am

oh... oh oh ... :D ... forget it ... it just didn't crash directly ... ehm ... ouch ... any further suggestions how I could remove this? :-D
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Re: Iterating through shapes

Postby slembcke » Fri Jun 19, 2009 11:42 am

You can't remove or free items from the same list while you are iterating it. This is a no-no with most any data structure in any language. You'll have to make a list of the objects you want to remove and remove them separately.
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Re: Iterating through shapes

Postby divisator » Sat Jun 20, 2009 11:20 am

I'm sorry - you're great ;-D ... it works (even though it's in a loop ;-) ...

Everything works fine - I just got two methods of creating shapes - and made that

body->data = shape

change only in the wrong method :-D ... I'm an idiot :-D ... but now it works great - I'm so happy :-D thx
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Re: Iterating through shapes

Postby divisator » Sat Jun 20, 2009 11:22 am

Oh ... correction ;-) ... for anyone who tries that ;-D ... it's not in a loop ... after that ->data change I don't need the loop anymore ;-)
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Re: Iterating through shapes

Postby Rawlyn » Mon Jun 22, 2009 9:01 am

slembcke, you should give Chipmunk a slogan:
"Don't try and delete pointers that you're still iterating through, and maintain your own goddamn lists!"
Or, at least, whatever that would be in Latin ;)

You have the patience of a saint my friend! :)
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