JSON Contribution

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http://box2d.org/forum/viewtopic.php?f=3&t=7087

Original issue reported on code.google.com by erinca...@gmail.com on 8 Jun 2011 at 11:17

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http://www.iforce2d.net/b2djson

Original comment by iforc...@gmail.com on 29 Jun 2011 at 8:21

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It looks like irresistible force is already hosting this contribution, which is 
probably for the best so he can keep it up to date.

Original comment by erinca...@gmail.com on 22 Aug 2011 at 10:48

• Changed state: Done

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Sure!

Just one point I would like bump again though, is the need for a few extra 
Getxxx() functions in order to get all the info needed for a complete snapshot 
of a b2World. Although these are pretty trivial to implement it would be 
convenient if they were part of the official library, since this will come up 
again in future for anyone who wants to implement this kind of exporter. It 
would be great if we could just say "get Box2D v2.x.x and add these files", 
instead of the current situation where I feel compelled to host a download of 
the whole Box2D source with the changes made, so people can jump into it easier.

It's mainly joints that needed a little extra. Basically anything which is in a 
joint def needs to be accessible from the joint instance after it has been 
created. fwiw here's what I needed to add this time, there may be more 
appropriate ways...:

b2World
        bool GetWarmStarting()
        bool GetContinuousPhysics()
        bool GetSubStepping()
        bool GetAllowSleep()

  b2WheelJoint
        b2Vec2 GetLocalAxisA()

  b2RevoluteJoint
        float32 GetMaxMotorTorque()

  b2GearJoint
        b2Joint* GetJoint1()
        b2Joint* GetJoint2()
  //After r186 the gear joint no longer holds references to the
  //original joints it parents - I needed to keep these references.
  //For now, b2dJson is not supporting gear joints.
  //To implement an exporter fully, references to the two controlled 
  //joints will need to be available to recreate the joint def.

  b2PrismaticJoint
        float32 GetMaxMotorForce()
        b2Vec2 GetLocalAxisA()
        float32 GetReferenceAngle()

  b2WeldJoint
        float32 GetReferenceAngle()

Original comment by iforc...@gmail.com on 23 Aug 2011 at 10:24

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Original comment by erinca...@gmail.com on 25 Aug 2011 at 7:25

• Changed state: Accepted

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This issue was closed by revision r217.

Original comment by erinca...@gmail.com on 4 Sep 2011 at 9:48

• Changed state: Fixed

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Completed: At revision: 217  

Original comment by erinca...@gmail.com on 4 Sep 2011 at 9:48