在行为树中，需要扩展的主要是行为节点和条件节点。一般来说，每当要创建一个节点时，就要新建一个节点文件。而对于一些简单的行为节点和条件节点，为了去掉新建文件的过程，可以写一个通用版本的行为节点和条件节点，以传入方法的方式来避免新建文件。

 

BTActionUniversal.lua

1 --[[ 2 通用Action节点 3 --]] 4 BTActionUniversal = BTAction:New(); 5  6 local this = BTActionUniversal; 7 this.name = "BTActionUniversal"; 8  9 function this:New(enterFunc, executeFunc, exitFunc)10     local o = {};11     setmetatable(o, self);12     self.__index = self;13     o.enterFunc = enterFunc;14     o.executeFunc = executeFunc;15     o.exitFunc = exitFunc;16     return o;17 end18 19 function this:Enter()20     if (self.enterFunc) then21         self.enterFunc();22     end23 end24 25 function this:Execute()26     if (self.executeFunc) then27         return self.executeFunc();28     else29         return BTTaskStatus.Failure;30     end31 end32 33 function this:Exit()34     if (self.exitFunc) then35         self.exitFunc();36     end37 end

 

BTConditionalUniversal.lua

1 --[[ 2 通用Conditional节点 3 --]] 4 BTConditionalUniversal = BTConditional:New(); 5  6 local this = BTConditionalUniversal; 7 this.name = "BTConditionalUniversal"; 8  9 function this:New(checkFunc)10     local o = {};11     setmetatable(o, self);12     self.__index = self;13     o.checkFunc = checkFunc;14     return o;15 end16 17 function this:Check()18     return self.checkFunc(); 19 end

 

TestBehaviorTree.lua

1 TestBehaviorTree = BTBehaviorTree:New(); 2  3 local this = TestBehaviorTree; 4 this.name = "TestBehaviorTree"; 5  6 function this:New() 7     local o = {}; 8     setmetatable(o, self); 9     self.__index = self;10     o:Init();11     return o;12 end13 14 function this:Init()15     local sequence = BTSequence:New();16     local conditional = self:GetBTConditionalUniversal();17     local action = self:GetBTActionUniversal();18     local log = BTLog:New("This is log!!!");19     log.name = "log";20 21     self:SetStartTask(sequence);22 23     sequence:AddChild(conditional);24     sequence:AddChild(action);25     sequence:AddChild(log);26 end27 28 function this:GetBTConditionalUniversal()29     local a = function ()30         return (2 > 1);31     end32     local universal = BTConditionalUniversal:New(a);33     return universal;34 end35 36 function this:GetBTActionUniversal()37     local count = 1;38     local a = function () print("11"); end39     local b = function ()40         if (count < 3) then41             count = count + 1;42             print("22");43             return BTTaskStatus.Running;44         else45             return BTTaskStatus.Success;46         end47     end48     local c = function () print("33"); end49     local universal = BTActionUniversal:New(a, b, c);50     return universal;51 end

 

打印如下：