Remove body and keep sprite

Dikkesnoek

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

@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

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

I think that body.removed should work best
I'm usually doing something similar for joints