[LibGDX][Box2D] Casting Body ClassCastException

Newbie & Debugging Questions
#1

I am a bit stumped here on why this is not working, it was working before and I can’t remember what I changed lol.

Basically I have a factory method that allows you to create a Physics instance, Physics extends Body and has a bunch of helper methods built in.

However, to create a body you must do the following:

Body body = world.createBody(bd);

But my method returns Physics like so:

	public static Physics createPhysics(BodyType type, Vector2 position,
			boolean fixedRotation) {
		BodyDef bd = new BodyDef();
		bd.type = type;
		bd.position.set(position);
		bd.fixedRotation = fixedRotation;
		Body body = world.createBody(bd);
		Physics p = (Physics) body;
		return p;
	}

I can see right away this is not going to work, Body is not an instance of Physics so you can’t cast it. I am not sure what to do here, I can’t create a Physics instance due to the way the Body class is coded, it requires data only the World can provide.

I would like to get this working as it really reduces the amount of lines of code, like getX() and getY() for a start as well as helper methods for changing fixture filter data with 1 line.

#2

The way I would do it is in your Physics object, have a Body object.

As a side note, there is also Body.SetUserData or something like that, which holds whatever object you put in there. Just throwing this ‘out there’, because you might need it sometime.

#3

Yeah I had this the first time around, however it seemed more sensible to just extend the Body class and add some new methods as opposed to making it a field.

I basically want to avoid having to do this:

physics.getBody().doSomething()

And instead just do:

physics.doSomething()

Such as apply force and what not, but at the same time I want to define new methods like getX() and getY(). As well as other methods to do tests and handle filter swaps.

EDIT: Yeah I use the userData field for holding the object that is using the body :stuck_out_tongue: