Sparrow Forum

1. 

   idrach55
   Member

   Hey Guys!,

   After about a week of fooling around with the Sparrow Framework I am quite impressed! The only thing I felt was lacking was physics so I decided to try using the Chipmunk Manager with Sparrow. As someone who is very used to using Box2D, I felt Chipmunk was a bit foreign. So I decided to write a small Sparrow specific wrapper for Box2D. As of now the wrapper only contains 2 classes: SPBody and SPWorld.

   - SPBody inherits from SPImage and has properties and methods for all b2Body functionality.
   - SPWorld inherits from SPSprite and also has properties that correspond to b2World functionality.

   I added these to the AppScaffold project and after a few more tweaks, I'll post a link for the edited AppScaffold Project. I'll make sure it's well commented so people know how to use the wrapper. I'm going on a vacation tomorrow and won't have my computer, so I'll make sure the code is up by tonight.

   Hope you all will enjoy!
   Happy Coding!

   - Isaac

   Posted 9 months ago #
2. 

   Daniel
   Primary Feather

   Hey, that sounds great, Isaac! It would be great to have an easy to use sample with Box2D, as well!

   Thanks a lot for your efforts!

   Posted 9 months ago #
3. 

   idrach55
   Member

   @Daniel, I'm happy to help out.

   Here is the source forge link: http://sourceforge.net/p/spbox2d/home/Home/

   The Game.mm contains some comments showing how to use SPBox2D. Overall, the project creates a simple bouncing box.
   When I'm back I'll work on adding joints.

   Enjoy!

   - Isaac

   Posted 9 months ago #
4. 

   Doolali
   Member

   Really good idrach, saves me coding my own collisions again.

   One thing i added to mine, which you might want to add to the github.

   It simply just allows you to create with texture instead of just contents of file.

   +(id) bodyWithTexture:(SPTexture *)texture
   {
       return [[SPBody alloc] initWithTexture:texture];
   }
    
   -(id) initWithTexture:(SPTexture *)texture
   {
   	if ((self = [super initWithTexture:texture]))
   	{
   		_physicsType = kDynamic;
   		_collisionType = 0xFFFF;
   		_collidesWithType = 0xFFFF;
   		_active = NO;
   		_sleepy = YES;
   		_awake = YES;
   		_solid = YES;
   		_fixed = NO;
   		_bullet = NO;
   		_density = 1.0;
   		_friction = 0.3;
   		_bounce = 0.2;
   		_damping = 0.0;
   		_angularDamping = 0.0;
   		_angularVelocity = 0.0;
   		_velocity = CGPointZero;
   		_body = NULL;
   		_world = nil;
    
   		_shapes = [[NSMutableDictionary alloc] init];
   		_shapeData = [[NSMutableDictionary alloc] init];
    
           [self addEventListener:@selector(onEnter:) atObject:self forType:SP_EVENT_TYPE_ADDED];
           [self addEventListener:@selector(onExit:) atObject:self forType:SP_EVENT_TYPE_REMOVED];
   	}
   	return self;
   }

   Also is there a way to set a specific bounce height?
   And is there a way to enable and disable collisions?

   Posted 8 months ago #
5. 

   Bart
   Member

   Looks nice! I'm not familiar with box2d, so I have a question about your sample project. It says:

   // Add the shape (collider).
   [body1 addBoxWithName:@"Box1"];

   Where exactly is this shape defined? How would I set my own shape?

   Posted 6 months ago #
6. 

   jdanek
   Member

   I don't know exactly how to set it up but the addpolygonwithName might help

           [body1 addPolygonWithName:@"Box1" withVertices:body1Points];

   You would i to set the body1points as a array filed with the vertexes of your object. Im assuming.

   Hope this helps

   Posted 5 months ago #
7. 

   Bart
   Member

   Thanks, I'll try that. So the "Box1" doesn't actually refer to any predefined shape? It's just a name you give on the spot?

   Posted 5 months ago #
8. 

   jdanek
   Member

   Im not actually quite sure about the name, in the example code they all use the Box1 name so i would just keep using it, But i don't know there might be some problem with it.

   Posted 5 months ago #
9. 

   Anonymous
   Unregistered

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   Posted 5 months ago #
10. 

    Lestek
    Member

    I don't know why but boxes are spinning around like crazy.

    Posted 5 months ago #
11. 

    Grebog
    Member

    Hello!

    I tried to use this Extension, but i got the same problems as you.
    After digging in the Code of SPBody i decided to build my own Box2D classes.

    Posted 4 months ago #
12. 

    erikcore
    Member

    The initial work on this wrapper is fantastic. Has there been any work done on it since?

    @Grebog Have you made any progress on additional classes?

    Posted 2 months ago #
13. 

    Grebog
    Member

    the problem on the SPBody class is, that the positioning of the box2d body set the position of the sprite, which calls _body->SetTransform , the same for the rotation.
    This breaks the physik engine.

    Posted 2 months ago #

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