之前已经实现了在场景上添加英雄，并使英雄播放待机动作，接下来让英雄在场景动起来

本游戏的代码已开源，包含游戏资源
git地址
https://github.com/dreamfairy/PrompaLua

首先我们创建用户控制层 HudLayer.lua 包位置为 scenes.layers.HudLayer.lua

HudLayer.lua 的内容为
[cc lang=”lua”]
local HudLayer = class(“HudLayer”, function()
return display.newLayer()
end)

local DPad
function HudLayer:ctor()

end

function HudLayer:getDPad()
return DPad
end

return HudLayer
[/cc]

可以看到我们实现了一个 getDPad()方法，但是DPad目前还是nil, 接下来开始创建 DPad 用户操控面板
创建 SimpleDPad.lua 包位置为 scenes.Controller.SimpleDPad.lua

SimpleDPad 内容：
[cc lang=”lua”]
local SimpleDPad = class(“SimpleDPad”, function()
return display.newSprite(“pd_dpad.png”)
end)

local Radius
local Direction
local IsHeld
local Delegate

function SimpleDPad:ctor()
local updateFunc = function(dt) self:onUpdate(dt) end
IsHeld = false
Direction = CCPointZero
self:scheduleUpdate(updateFunc)
self:setNodeEventEnabled(true)

self.touchLayer = display.newLayer()
self:addChild(self.touchLayer)
end

function SimpleDPad:updateDirectionForTouchLocation(location)
local radians = ccpToAngle(ccpSub(location,ccp(self:getPositionX(),self:getPositionY())))
local degrees = -1 * math.deg(radians)

if degrees <= 22.5 and degrees >= -22.5 then
–right
Direction = ccp(1.0,0.0)
elseif degrees > 22.5 and degrees < 67.5 then --bottom right Direction = ccp(1.0,-1.0) elseif degrees >= 67.5 and degrees <= 112.5 then --bottom Direction = ccp(0.0,-1.0) elseif degrees > 112.5 and degrees < 157.5 then --bottom left Direction = ccp(-1.0,-1.0) elseif degrees >= 157.5 or degrees <= -157.5 then --left Direction = ccp(-1.0,0.0) elseif degrees < -22.5 and degrees > -67.5 then
–top right
Direction = ccp(1.0,1.0)
elseif degrees <= -67.5 and degrees >= -112.5 then
–top
Direction = ccp(0.0,1.0)
elseif degrees < -112.5 and degrees > -157.5 then
–top left
Direction = ccp(-1.0,1.0)
end

Delegate:didChangeDirectionTo(self,Direction)
end

function SimpleDPad:onEnter()
self.touchLayer:addTouchEventListener(function(event,x,y)
return self:onTouch(event,x,y)
end)
self.touchLayer:setTouchEnabled(true)
end

function SimpleDPad:onExit()
self.touchLayer:removeTouchEventListener()
self:setTouchEnabled(false)
end

function SimpleDPad:onUpdate(dt)
–CCLuaLog(dt)
if IsHeld == true then
Delegate:isHoldingDirection(self,Direction)
end
end

function SimpleDPad:setRadius(value)
Radius = value;
end

function SimpleDPad:setDelegate(value)
Delegate = value
end

function SimpleDPad:onTouch(event,x,y)
local location = ccp(x,y)
if event == “began” then
local distanceSQ = ccpDistanceSQ(location, ccp(self:getPositionX(),self:getPositionY()))
if distanceSQ <= Radius * Radius then self:updateDirectionForTouchLocation(location) IsHeld = true return true end return false end if event == "moved" then self:updateDirectionForTouchLocation(location) end if event == "ended" then location = CCPointZero IsHeld = false Delegate:simpleDPadTouchEnded(self) end end return SimpleDPad [/cc] 使用 display.newSprite("pd_dpad.png") 8方向键作为用户的操作面板 self:setNodeEventEnabled(true) 开启节点事件，只有开启该事件 onEnter 和 onExit函数才会被调用，我们需要在 onEnter 函数中添加触摸事件监听，并在 onExit中移除它 self.touchLayer = display.newLayer() 建立一个 touch 层，用来接收触摸事件 self:addChild(self.touchLayer) 在编写的时候，Delegate 是在 setDelegate 函数调用后初始化的，Delegate 实际上市一个 接口，任何实现该接口的类都可以被set进来 现在来编写 Delegate 接口，一共有3个函数和1个继承方法 创建 SimpleDPadDelegate.lua 包位置 scenes.Controller.SimpleDPadDelegate.lua SimpleDPadDelegate 的内容如下 [cc lang="lua"] local SimleDpadDelegate = {} function SimleDpadDelegate:extend() local o = {} setmetatable(o,self) self.__index = self return o end function SimleDpadDelegate:didChangeDirectionTo(SimpleDPad,Direction) CCLuaLog("This function muse be written") end function SimleDpadDelegate:isHoldingDirection(SimpleDPad,Direction) CCLuaLog("This function muse be written") end function SimleDpadDelegate:simpleDPadTouchEnded(SimpleDPad, Direction) CCLuaLog("This function muse be written") end return SimleDpadDelegate [/cc] 好了，现在有Delegate 接口了，我们让 GameLayer 来实现它,并在GameLayer上实现操控英雄的逻辑 GamLayer.lua 中添加一个变量 [cc lang="lua"] local Delegate = require("scenes.Controller.SimpleDPadDelegate"):extend() [/cc] Delegate 继承了 SimpleDPadDelegate中的方法，之后要在GameLayer中具体实现 继续实现3个方法 [cc lang="lua"] function Delegate:didChangeDirectionTo(SimpleDPad,Direction) Hero:walkWithDirection(Direction) end function Delegate:isHoldingDirection(SimpleDPad,Direction) Hero:walkWithDirection(Direction) end function Delegate:simpleDPadTouchEnded(SimpleDPad, Direction) if Hero:getActionState() == ACTION_STATE_WALK then Hero:idle() end end [/cc] 操作的逻辑部分基本完成，现在将它们组装起来 在HudLayer.lua 的ctor()中添加下列代码 [cc lang="lua"] function HudLayer:ctor() DPad = require("scenes.Controller.SimpleDPad").new() DPad:setRadius(64) DPad:setPosition(64,64) DPad:setOpacity(100) self:addChild(DPad) end [/cc] 在 GameScene 中添加HudLayer,并将 GameLayer 设置为Delegate GameScene.lua 现在完整代码如下 [cc lang="lua"] require("config") local GameScene = class("GameScene", function() return display.newScene("GameScene") end) local GameLayer = require("scenes.layers.GameLayer").new() local HudLayer = require("scenes.layers.HudLayer").new() function GameScene:ctor() self:addChild(GameLayer) self:addChild(HudLayer) local DPad = HudLayer:getDPad() DPad:setDelegate(GameLayer:getClass()) end 到此为止，你已经可以使用你的控制器，控制英雄行走了
return GameScene
[/cc]

下一节将添加上怪物们，以及让它们可以被攻击