[Unity插件]Lua行为树(十)：通用行为和通用条件节点

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

--[[
通用Action节点
--]]
BTActionUniversal = BTAction:New();

local this = BTActionUniversal;
this.name = "BTActionUniversal";

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

function this:Enter()
    if (self.enterFunc) then
        self.enterFunc();
    end
end

function this:Execute()
    if (self.executeFunc) then
        return self.executeFunc();
    else
        return BTTaskStatus.Failure;
    end
end

function this:Exit()
    if (self.exitFunc) then
        self.exitFunc();
    end
end

BTConditionalUniversal.lua

--[[
通用Conditional节点
--]]
BTConditionalUniversal = BTConditional:New();

local this = BTConditionalUniversal;
this.name = "BTConditionalUniversal";

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

function this:Check()
    return self.checkFunc(); 
end

TestBehaviorTree.lua

TestBehaviorTree = BTBehaviorTree:New();

local this = TestBehaviorTree;
this.name = "TestBehaviorTree";

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

function this:Init()
    local sequence = BTSequence:New();
    local conditional = self:GetBTConditionalUniversal();
    local action = self:GetBTActionUniversal();
    local log = BTLog:New("This is log!!!");
    log.name = "log";

    self:SetStartTask(sequence);

    sequence:AddChild(conditional);
    sequence:AddChild(action);
    sequence:AddChild(log);
end

function this:GetBTConditionalUniversal()
    local a = function ()
        return (2 > 1);
    end
    local universal = BTConditionalUniversal:New(a);
    return universal;
end

function this:GetBTActionUniversal()
    local count = 1;
    local a = function () print("11"); end
    local b = function ()
        if (count < 3) then
            count = count + 1;
            print("22");
            return BTTaskStatus.Running;
        else
            return BTTaskStatus.Success;
        end
    end
    local c = function () print("33"); end
    local universal = BTActionUniversal:New(a, b, c);
    return universal;
end

打印如下：