Filter

Collaboration diagram for Filter:

Files
file	Filter.h
file	Complement.h
file	Difference.h
file	First.h
file	Intersection.h
file	Last.h
file	LUAFilter.h
file	Random.h
file	SelectAll.h
file	SelectEmpty.h
file	SelectGroupLeader.h
file	SelectGroupMembers.h
file	SelectHighestAggro.h
file	SelectZone.h
file	Union.h

Detailed Description

In combination with the Filter condition IFilter provides a quite flexible way to provide generic behaviour tree tasks. You can just create one ITask implementation that deals with e.g. attacking. The target is just picked from the selection. If you encapsulate this with a condition like (lua):

someNode:addNode("AttackTarget", "attack"):setCondition("Filter(SelectGroupLeader{1})")

You would only attack the group leader of group 1 if it was found. You can provide your own filters like: SelectAllInRange, SelectWithAttribute or whatever you like to filter selections and forward them to tasks.

There are some filters that accept subfilters - like Union, Intersection, Last, First, Difference, Complement and Random. Last, First and Random accept one sub filter as parameter, Union and Intersection accept at least two sub filters.

someNode:addNode("AttackTarget", "attack"):setCondition("Filter(First(SelectZone))")

Random also accepts a parameter for how many items should be randomly preserved:

someNode:addNode("AttackTarget", "attack"):setCondition("Filter(Random{1}(SelectZone))")