【quick-cocos2d-lua】 Finite State Machine

有限状态机：

例：

开始状态：

点击panic:

点击calm：

代码解析：

[code]local MainScene = class("MainScene", function()
return display.newScene("MainScene")
end)

function MainScene:ctor()
-- create Finite State Machine
self.fsm_ = {}
cc.GameObject.extend(self.fsm_)
:addComponent("components.behavior.StateMachine")
:exportMethods()

self.fsm_:setupState({
events = {
{name = "start", from = "none",   to = "green" },
{name = "warn",  from = "green",  to = "yellow"},
{name = "panic", from = "green",  to = "red"   },
{name = "panic", from = "yellow", to = "red"   },
{name = "calm",  from = "red",    to = "yellow"},
{name = "clear", from = "red",    to = "green" },
{name = "clear", from = "yellow", to = "green" },
},

callbacks = {
onbeforestart = function(event) self:log("[FSM] STARTING UP") end,
onstart       = function(event) self:log("[FSM] READY") end,
onbeforewarn  = function(event) self:log("[FSM] START   EVENT: warn!", true) end,
onbeforepanic = function(event) self:log("[FSM] START   EVENT: panic!", true) end,
onbeforecalm  = function(event) self:log("[FSM] START   EVENT: calm!",  true) end,
onbeforeclear = function(event) self:log("[FSM] START   EVENT: clear!", true) end,
onwarn        = function(event) self:log("[FSM] FINISH  EVENT: warn!") end,
onpanic       = function(event) self:log("[FSM] FINISH  EVENT: panic!") end,
oncalm        = function(event) self:log("[FSM] FINISH  EVENT: calm!") end,
onclear       = function(event) self:log("[FSM] FINISH  EVENT: clear!") end,
onleavegreen  = function(event) self:log("[FSM] LEAVE   STATE: green") end,
onleaveyellow = function(event) self:log("[FSM] LEAVE   STATE: yellow") end,
onleavered    = function(event)
self:log("[FSM] LEAVE   STATE: red")
self:pending(event, 3)
self:performWithDelay(function()
self:pending(event, 2)
self:performWithDelay(function()
self:pending(event, 1)
self:performWithDelay(function()
self.pendingLabel_:setString("")
event.transition()
end, 1)
end, 1)
end, 1)
return "async"
end,
ongreen       = function(event) self:log("[FSM] ENTER   STATE: green") end,
onyellow      = function(event) self:log("[FSM] ENTER   STATE: yellow") end,
onred         = function(event) self:log("[FSM] ENTER   STATE: red") end,
onchangestate = function(event) self:log("[FSM] CHANGED STATE: " .. event.from .. " to " .. event.to) end,
},
})

-- create UI
display.newColorLayer(cc.c4b(255, 255, 255, 255))
:addTo(self)

cc.ui.UILabel.new({
text = "Finite State Machine",
size = 32,
color = display.COLOR_BLACK
})
:align(display.CENTER, display.cx, display.top - 60)
:addTo(self)

self.pendingLabel_ = cc.ui.UILabel.new({
text = "",
size = 32,
color = display.COLOR_BLACK,
x = display.cx,
y = display.top - 620,
})
:align(display.CENTER)
:addTo(self)

-- preload texture
self.stateImage_ = display.newSprite("#GreenState.png")
:pos(display.cx, display.top - 300)
:scale(1.5)
:addTo(self)

self.clearButton_ =
cc.ui.UIPushButton.new()
:setButtonLabel(cc.ui.UILabel.new({text = "clear", size = 32, color = display.COLOR_BLACK}))
:onButtonClicked(function()
if self.fsm_:canDoEvent("clear") then
self.fsm_:doEvent("clear")
end
end)
:align(display.CENTER, display.cx - 150, display.top - 540)
:addTo(self)

self.calmButton_ =
cc.ui.UIPushButton.new()
:setButtonLabel(cc.ui.UILabel.new({text = "calm", size = 32, color = display.COLOR_BLACK}))
:onButtonClicked(function()
if self.fsm_:canDoEvent("calm") then
self.fsm_:doEvent("calm")
end
end)
:align(display.CENTER, display.cx - 50, display.top - 540)
:addTo(self)

self.warnButton_ =
cc.ui.UIPushButton.new()
:setButtonLabel(cc.ui.UILabel.new({text = "warn", size = 32, color = display.COLOR_BLACK}))
:onButtonClicked(function()
if self.fsm_:canDoEvent("warn") then
self.fsm_:doEvent("warn")
end
end)
:align(display.CENTER, display.cx + 50, display.top - 540)
:addTo(self)

self.panicButton_ =
cc.ui.UIPushButton.new()
:setButtonLabel(cc.ui.UILabel.new({text = "panic", size = 32, color = display.COLOR_BLACK}))
:onButtonClicked(function()
if self.fsm_:canDoEvent("panic") then
self.fsm_:doEvent("panic")
end
end)
:align(display.CENTER, display.cx + 150, display.top - 540)
:addTo(self)

-- debug
self.logCount_ = 0
end

function MainScene:pending(event, n)
local msg = event.to .. " in ..." .. n
self:log("[FSM] PENDING STATE: " .. msg)
self.pendingLabel_:setString(msg)
end

function MainScene:log(msg, separate)
if separate then self.logCount_ = self.logCount_ + 1 end
if separate then print("") end
printf("%d: %s", self.logCount_, msg)

local state = self.fsm_:getState()
if state == "green" then
self.stateImage_:setSpriteFrame(display.newSpriteFrame("GreenState.png"))
elseif state == "red" then
self.stateImage_:setSpriteFrame(display.newSpriteFrame("RedState.png"))
elseif state == "yellow" then
self.stateImage_:setSpriteFrame(display.newSpriteFrame("YellowState.png"))
end

-- self.clearButton_:setEnabled(self.fsm_:canDoEvent("clear"))
-- self.calmButton_:setEnabled(self.fsm_:c
4000
anDoEvent("calm"))
-- self.warnButton_:setEnabled(self.fsm_:canDoEvent("warn"))
-- self.panicButton_:setEnabled(self.fsm_:canDoEvent("panic"))
end

function MainScene:onEnter()
self.fsm_:doEvent("start")
end

return MainScene