[Unity插件]Lua行为树(四)：条件节点和行为节点

条件节点和行为节点，这两种节点本身的设计比较简单，项目中编写行为树节点一般就是扩展这两种节点，而Decorator和Composite节点只需要使用内置的就足够了。

它们的继承关系如下：

Conditional->Task

Action->Task

代码如下：

BTAction.lua

 BTAction = BTTask:New();

 local this = BTAction;

 function this:New()

     local o = {};

     setmetatable(o, self);

     self.__index = self;

     return o;

 end

BTConditional.lua

 BTConditional = BTTask:New();

 local this = BTConditional;

 function this:New()

     local o = {};

     setmetatable(o, self);

     self.__index = self;

     return o;

 end

BTLog.lua

 --[[

 参考BehaviorDesigner-Action-Log

 --]]

 BTLog = BTAction:New();

 local this = BTLog;

 function this:New(text)

     local o = {};

     setmetatable(o, self);

     self.__index = self;

     o.text = text;

     return o;

 end

 function this:OnUpdate()

     print(self.text);

     return BTTaskStatus.Success;

 end

BTIsNullOrEmpty.lua

 --[[

 参考BehaviorDesigner-Conditional-IsNullOrEmpty

 --]]

 BTIsNullOrEmpty = BTConditional:New();

 local this = BTIsNullOrEmpty;

 function this:New(text)

     local o = {};

     setmetatable(o, self);

     self.__index = self;

     o.text = text;

     return o;

 end

 function this:OnUpdate()

     if (not self.text or self.text == "") then

         return BTTaskStatus.Success;

     else

         return BTTaskStatus.Failure;

     end

 end

TestBehaviorTree.lua

 TestBehaviorTree = BTBehaviorTree:New();

 local this = TestBehaviorTree;

 function this:New()

     local o = {};

     setmetatable(o, self);

     self.__index = self;

     this:Init();

     return o;

 end

 function this:Init()

     local sequence = BTSequence:New();

     local isNullOrEmpty = BTIsNullOrEmpty:New("");

     local log = BTLog:New("This is a empty string");

     sequence:AddChild(isNullOrEmpty);

     sequence:AddChild(log);

     this:PushTask(sequence);

 end

输出如下：

巴特西

[Unity插件]Lua行为树(四)：条件节点和行为节点

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