How to know a dynamic sprite in an attack range of a static sprite in box2d?

louis

I know ,when objects touched each other, will dispatch contract event,but I found box2d only dispatch event once, when dynamic object walk into static scope,no event dispatched.

louis

Maybe I'm think wrong? Should I use query AABB method?

ar2rsawseen

@louis if there are not too many object you can use their position and calculate the distance for them your self, like here:
http://appcodingeasy.com/Gideros-Mobile/Gideros--Box2d-magnets

If there are many object, you would not want to constantly calculating distance, so it would be better to use queryAABB method

louis

@ar2rsawseen ,thanks,you rock.
In my game,maybe have less than 100 sprite, I know this is not a lot,I use queryAABB method,but I wrote not good,so I change to use TNT collision ,it done.
I will try to use box2d magnets to rewrite it tomorrow.