关于cocos2dx虚拟摇杆的lua实现

看到网上不少虚拟摇杆的代码，但是都是在c++里面实现，非常不方便，所以我自己把c++的代码移植到lua里面

local VitrualController = class("VitrualController", cc.Layer)

function VitrualController:ctor(app, name)

if self.onCreate then self:onCreate() end
end

function VitrualController:onTouchesEnded(touches, event )
self:_deactive()
end

function VitrualController:onTouchesBegan(touches, event )
self.start_pos = cc.p(touches[1]:getLocation())
self:_active(self.start_pos)
end

function VitrualController:onTouchesMove(touches, event )
local pos = cc.p(touches[1]:getLocation())
local distance = cc.pGetDistance(self.start_pos,pos)
local direction = cc.pNormalize(cc.pSub(pos,self.start_pos))
self:_update(direction,distance)
end

function VitrualController:onCreate()
self.joystick = cc.Sprite:create( "res/Joystick_03.png")
self.joystick:setScale(0.2,0.2)
self.joystick_bg = cc.Sprite:create( "res/Back_04.png")
self.joystick_bg:setScale(0.3,0.3)
self:addChild(self.joystick_bg)
self:addChild(self.joystick)

local listener = cc.EventListenerTouchAllAtOnce:create()

listener:registerScriptHandler(function(...) self:onTouchesBegan(...) end,cc.Handler.EVENT_TOUCHES_BEGAN )
listener:registerScriptHandler(function(...) self:onTouchesEnded(...) end,cc.Handler.EVENT_TOUCHES_ENDED )
listener:registerScriptHandler(function(...) self:onTouchesMove(...) end,cc.Handler.EVENT_TOUCHES_MOVED )
local eventDispatcher = self:getEventDispatcher()
eventDispatcher:addEventListenerWithSceneGraphPriority(listener, self)

end

function VitrualController:_active(pos)
self.joystick:setPosition(pos)
self.joystick_bg:setPosition(pos)
self.joystick:setVisible(true)
self.joystick_bg:setVisible(true)
end

function VitrualController:_deactive(pos)
self.joystick:setVisible(false)
self.joystick_bg:setVisible(false)
end

function VitrualController:_update(direction,distance)
print("seayoung udpate",direction.x,direction.y,distance)
local start = cc.p(self.joystick_bg:getPosition())
if distance < 32 then
self.joystick:setPosition(cc.pAdd(start , (cc.pMul(direction ,distance))))
else if distance > 96 then
self.joystick:setPosition(cc.pAdd(start , (cc.pMul(direction ,64))))
else
self.joystick:setPosition(cc.pAdd(start , (cc.pMul(direction ,32))))
end
end

end

return VitrualController