Remove body and keep sprite

Dikkesnoek · April 2013

Hi,

I've again found something I don't completely understand. During gameplay, I sometimes want to destroy a body and sprite (in a for body,sprite in pairs(actors) do loop) by using:

if (sprite.removeMe) then
	world:destroyBody(body)
	stage:removeChild(sprite)
	actors[body] = nil 
end

and sometimes I will keep the picture/sprite in place and only deactivate the body by using:

if (sprite.removeMyBody) then
	body:setActive(false)
	sprite.removeMyBody = false
end

Sometimes I will get an error:
main.lua:190: Body is already destroyed.

Instead of body:setActive(false), destroying the body is also possible but gives me more errors.

Is there a proper way to determine if a body has removed from the actors array?

I tried this but this doesn't seems to work:

for body,sprite in pairs(actors) do
	if body ~= nil then
           .....
end

Can't you use the nil test on a body?

Thanks,

Marc

ar2rsawseen · April 2013

@Dikkesnoek unfortunately body may be destroyed, but it will still not be nil.
So I'd say first you would need to check if body should be removed like this:

if (sprite.removeMyBody) then
	world:destroyBody(body)
	sprite.removeMyBody = false
end

and only then check if sprite should be removed:

if (sprite.removeMe) then
	stage:removeChild(sprite)
	actors[body] = nil 
end

So if you would want to destroy both body and sprite, you would have to set up both

sprite.removeMyBody = true
sprite.removeMe = true

Dikkesnoek · April 2013

Ok, thanks again my friend. I will implement it directly. Am I right
that body is an object so I can test if it is nil? I can also add an
property, like sprite.body.removed to tell that a body is removed.

Regards,

Marc

ar2rsawseen · April 2013

I think that body.removed should work best

I'm usually doing something similar for joints

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