个回答

• 一滴清殇

  2016-08-02 09:50:09

  已采纳

  问题解决没有，我也和你出现了差不多的错误

  0

• FLY8

  2017-01-25 19:57:45

  求问如何解决的。。跟着老师代码一模一样。但是没有出现body

  0

• 水里有条鱼

  2016-05-07 10:46:13

  其实我也是新手，但是我看了一下，它好像是说你的node给了一个数值，你可以去MainScene那看一下snake的创建是不是self.snake = Snake.new(self)，大概是这个原因吧

  1

• 慕无忌4252426

  2016-05-07 10:15:08

  local Snake = class("Snake")

  local Body = require "app.Body"

  
  

  local cInitLen = 3

  
  

  function Snake:ctor( node )

  self.BodyArray = {}

  self.node = node

  self.MoveDir = "left"

  
  

  for i=1,cInitLen do

  self:Grow(i ==1)

  end

  end

  
  

  function Snake:GetTailGrid()

  if #self.BodyArray == 0 then

  return 0,0

  end

  
  

  local tail = self.BodyArray[#self.BodyArray]

  
  

  return tail.X,tail.Y

  end

  
  

  function Snake:Grow( isHead )

  local tailX,tailY = self:GetTailGrid()

  local body = Body:new(self,tailX,tailY,self.node,isHead)

  
  

  table.insert(self.BodyArray,body)

  end

  
  

  local function OffsetGridByDir( x,y,dir )

  if dir == "left" then

  return x-1,y

  elseif dir == "right" then

  return x+1,y

  elseif dir == "up" then

  return x,y-1

  elseif dir == "down" then

  return x,y+1

  end

  
  

  print("unknown dir",dir)

  
  

  return x,y

  end

  
  

  function Snake:Update()

  if #self.BodyArray == 0 then

  return 0,0

  end

  
  

  for i = #self.BodyArray,1,-1 do

  local body = self.BodyArray[i]

  
  

  if i == 1 then

  body.X,body.Y = OffsetGridByDir(body.X,body.Y,self.MoveDir)

  else

  local front = self.BodyArray[i-1]

  body.X,body.Y = front.X,front.Y

  end

  
  

  body:Update()

  end

  end

  
  

  return Snake

  
  

  0

• 慕无忌4252426

  2016-05-07 10:14:41

  local Body = class("Body")

  
  

  local cGridSize = 33

  local scaleRate = 1/display.contentScaleFactor

  
  

  function Grid2Pos( x,y )

  local visibleSize = cc.Director:getInstance():getVisibleSize()

  local origin = cc.Director:getInstance():getVisibleOrigin()

  
  

  local finalX = origin.x+visibleSize.width/2+x*cGridSize*scaleRate

  local finalY = origin.y+visibleSize.height/2+y*cGridSize*scaleRate

  
  

  return finalX,finalY

  end

  
  

  function Body:ctor( snake,x,y,node,isHead )

  self.snake = snake

  self.X = x

  self.Y = y

  
  

  if ishead then

  self.sp = cc.Sprite:create("head_l.png")

  else

  self.sp = cc.Sprite:create("body.png")

  end

  
  

  node:addChild(self.sp)

  
  

  self:Update()

  end

  
  

  function Body:Update()

  local posx,posy = Grid2Pos(self.X,self.Y)

  
  

  self.sp:setPosition(posx,posy)

  end

  
  

  return Body

  
  

  0