状态机在quick中是一个亮点，如果我们做一款RPG游戏，一个角色一般会拥有idle，attack，walk，run，death这些状态，如果游戏角色的状态采用分支条件判断的话，会造成非常庞大而难以维护，但一旦使用了状态机这种模式，就会显得简单方便。
对于quick中的状态机是如何实现的咱们先不去了解，首先看看如何去使用它。
总结起来，如果让一个类拥有状态机，主要有两步：
1.创建状态机对象
2.初始化状态机，主要包括事件和回调函数
1.创建状态机组件
self.fsm = {}
cc.GameObject.extend(self.fsm):addComponent("components.behavior.StateMachine"):exportMethods()2.初始化状态机（设置状态逻辑）
设置状态逻辑是重写setupState方法，这其中有这么几个字段参数，
一般我们会设置initial，events和callbacks这三个。
先看events，在events中需要分清楚“事件”和“状态”，events采用table结构，例如我们来写一个
events = {
{name = "move", from = {"idle", "jump"}, to = "walk"},
｝from的状态可以是单一状态，也可以使集合状态，就是几个状态，但to的状态只能唯一，不然程序还给你来个随机状态？肯定不行的。
所以这里需要想好我们的主角有哪些状态，当什么事件发生时，他会从什么状态变到什么状态上去。例如我简单这么写，
events = {
{name = "move", from = {"idle", "jump"}, to = "walk"},
{name = "attack", from = {"idle", "walk"}, to = "jump"},
{name = "normal", from = {"walk", "jump"}, to = "idle"},
},接下来一个重点是callbacks参数，
即所谓回调了，就是事件触发，会执行一系列的函数。
例如
callbacks = {
onenteridle = function () --或者 onidle
print("idle")
end,
},local Player = class("Player", function ()
return display.newSprite("icon.png")
end)
function Player:ctor()
self:addStateMachine()
end
function Player:doEvent(event)
self.fsm:doEvent(event)
end
function Player:addStateMachine()
self.fsm = {}
cc.GameObject.extend(self.fsm):addComponent("components.behavior.StateMachine"):exportMethods()
self.fsm:setupState({
initial = "idle",
events = {
{name = "move", from = {"idle", "jump"}, to = "walk"},
{name = "attack", from = {"idle", "walk"}, to = "jump"},
{name = "normal", from = {"walk", "jump"}, to = "idle"},
},
callbacks = {
onenteridle = function ()
local scale = CCScaleBy:create(0.2, 1.2)
self:runAction(CCRepeat:create(transition.sequence({scale, scale:reverse()}), 2))
end,
onenterwalk = function ()
local move = CCMoveBy:create(0.2, ccp(100, 0))
self:runAction(CCRepeat:create(transition.sequence({move, move:reverse()}), 2))
end,
onenterjump = function ()
local jump = CCJumpBy:create(0.5, ccp(0, 0), 100, 2)
self:runAction(jump)
end,
},
})
end
return Playerlocal Player = import("..views.Player")
local MyScene = class("MyScene", function ()
return display.newScene("MyScene")
end)
function MyScene:ctor()
local player = Player.new()
player:setPosition(display.cx, display.cy)
self:addChild(player)
local function menuCallback(tag)
if tag == 1 then
player:doEvent("normal")
elseif tag == 2 then
player:doEvent("move")
elseif tag == 3 then
player:doEvent("attack")
end
end
local mormalItem = ui.newTTFLabelMenuItem({text = "normal", x = display.width*0.3, y = display.height*0.2, listener = menuCallback, tag = 1})
local moveItem = ui.newTTFLabelMenuItem({text = "move", x = display.width*0.5, y = display.height*0.2, listener = menuCallback, tag = 2})
local attackItem = ui.newTTFLabelMenuItem({text = "attack", x = display.width*0.7, y = display.height*0.2, listener = menuCallback, tag = 3})
local menu = ui.newMenu({mormalItem, moveItem, attackItem})
self:addChild(menu)
end
return MyScene
quick-cocos2d-x游戏开发【14】——StateMachine状态机
原文地址：http://blog.csdn.net/w337198302/article/details/39430647
