[Unity插件]Lua行为树：通用行为和通用条件节点

Posted 2021-01-06 lyh916

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 end
18 
19 function this:Enter()
20     if (self.enterFunc) then
21         self.enterFunc();
22     end
23 end
24 
25 function this:Execute()
26     if (self.executeFunc) then
27         return self.executeFunc();
28     else
29         return BTTaskStatus.Failure;
30     end
31 end
32 
33 function this:Exit()
34     if (self.exitFunc) then
35         self.exitFunc();
36     end
37 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 end
16 
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 end
13 
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 end
27 
28 function this:GetBTConditionalUniversal()
29     local a = function ()
30         return (2 > 1);
31     end
32     local universal = BTConditionalUniversal:New(a);
33     return universal;
34 end
35 
36 function this:GetBTActionUniversal()
37     local count = 1;
38     local a = function () print("11"); end
39     local b = function ()
40         if (count < 3) then
41             count = count + 1;
42             print("22");
43             return BTTaskStatus.Running;
44         else
45             return BTTaskStatus.Success;
46         end
47     end
48     local c = function () print("33"); end
49     local universal = BTActionUniversal:New(a, b, c);
50     return universal;
51 end

 

打印如下：