[Unity插件]Lua行为树(十三)：装饰节点完善

之前介绍了组合节点中三大常用的节点：BTSequence、BTSelector和BTParallel，一般来说，这三种就够用了，可以满足很多的需求。

接下来可以完善一下装饰节点，增加几种新的节点。

1.BTInverter

 --[[
 结果取反：
 1.子节点返回Running，则节点返回Running
 2.子节点返回Success，则节点返回Failure
 3.子节点返回Failure，则节点返回Success
 --]]
 BTInverter = BTDecorator:New();

 local this = BTInverter;
 this.name = "BTInverter";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o.childTasks = {};
     return o;
 end

 function this:OnUpdate()
     if (not self.currentChildTask) then
         self.currentChildTask = self:GetChild();
         if (not self.currentChildTask) then
             return BTTaskStatus.Failure;
         end
     end

     self.executionStatus = self.currentChildTask:OnUpdate();

     if (self.executionStatus == BTTaskStatus.Running) then
         return BTTaskStatus.Running;
     elseif (self.executionStatus == BTTaskStatus.Success) then
         return BTTaskStatus.Failure;
     else
         return BTTaskStatus.Success;
     end
 end

 function this:Reset()
     self.executionStatus = BTTaskStatus.Inactive;
     BTParentTask.Reset(self);
 end

测试：

 TestBehaviorTree2 = BTBehaviorTree:New();

 local this = TestBehaviorTree2;
 this.name = "TestBehaviorTree2";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o:Init();
     return o;
 end

 function this:Init()
     local sequence = BTSequence:New();
     local inverter = BTInverter:New();
     local isNullOrEmpty = BTIsNullOrEmpty:New("");
     local log = BTLog:New("This is a tree!!!");

     self:SetStartTask(sequence);

     inverter:AddChild(isNullOrEmpty);

     sequence:AddChild(inverter);
     sequence:AddChild(log);
 end

输出：

2.BTReturnFailure

 --[[
 结果返回失败：
 1.子节点返回Running，则节点返回Running
 2.其余情况，则节点返回Failure
 --]]
 BTReturnFailure = BTDecorator:New();

 local this = BTReturnFailure;
 this.name = "BTReturnFailure";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o.childTasks = {};
     return o;
 end

 function this:OnUpdate()
     if (not self.currentChildTask) then
         self.currentChildTask = self:GetChild();
         if (not self.currentChildTask) then
             return BTTaskStatus.Failure;
         end
     end

     self.executionStatus = self.currentChildTask:OnUpdate();

     if (self.executionStatus == BTTaskStatus.Running) then
         return BTTaskStatus.Running;
     else
         return BTTaskStatus.Failure;
     end
 end

 function this:Reset()
     self.executionStatus = BTTaskStatus.Inactive;
     BTParentTask.Reset(self);
 end

测试：

 TestBehaviorTree2 = BTBehaviorTree:New();

 local this = TestBehaviorTree2;
 this.name = "TestBehaviorTree2";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o:Init();
     return o;
 end

 function this:Init()
     local selector = BTSelector:New();
     local returnFailure = BTReturnFailure:New();
     local isNullOrEmpty = BTIsNullOrEmpty:New();
     local log = BTLog:New("This is a tree!!!");

     self:SetStartTask(selector);

     returnFailure:AddChild(isNullOrEmpty);

     selector:AddChild(returnFailure);
     selector:AddChild(log);
 end

输出：

3.BTUntilFailure

 --[[
 结果返回失败：
 1.子节点返回Failure，则节点返回Failure
 2.其余情况，则节点返回Running
 --]]
 BTUntilFailure = BTDecorator:New();

 local this = BTUntilFailure;
 this.name = "BTUntilFailure";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o.childTasks = {};
     return o;
 end

 function this:OnUpdate()
     if (not self.currentChildTask) then
         self.currentChildTask = self:GetChild();
         if (not self.currentChildTask) then
             return BTTaskStatus.Failure;
         end
     end

     self.executionStatus = self.currentChildTask:OnUpdate();

     if (self.executionStatus ~= BTTaskStatus.Failure) then
         return BTTaskStatus.Running;
     else
         return BTTaskStatus.Failure;
     end
 end

 function this:Reset()
     self.executionStatus = BTTaskStatus.Inactive;
     BTParentTask.Reset(self);
 end

测试：

 TestBehaviorTree2 = BTBehaviorTree:New();

 local this = TestBehaviorTree2;
 this.name = "TestBehaviorTree2";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o:Init();
     return o;
 end

 function this:Init()
     local selector = BTSelector:New();
     local untilFailure = BTUntilFailure:New();
     local action = self:GetBTActionUniversal();
     local log = BTLog:New("This is a tree!!!");

     self:SetStartTask(selector);

     untilFailure:AddChild(action);

     selector:AddChild(untilFailure);
     selector:AddChild(log);
 end

 function this:GetBTActionUniversal()
     local count = ;
     local a = function ()
         if (count == ) then
             count = count + ;
             print("");
             return BTTaskStatus.Success;
         elseif (count == ) then
             count = count + ;
             print("");
             return BTTaskStatus.Running;
         else
             print("");
             return BTTaskStatus.Failure;
         end
     end
     local universal = BTActionUniversal:New(nil, a);
     return universal;
 end

输出：

最后给出这个系列的源码：

https://pan.baidu.com/s/1QwjozJ3dEpqNRL04oLvfHw