蛇不动 身和头重叠，求解..
蛇不动，蛇身和头重叠在中央不动，代码应该和视频里的一样，不知怎么破，请教老师求解
mainscene.lua:
local Snake = require"app.Snake"
local MainScene = class("MainScene", function()
return display.newScene("MainScene")
end)
--[[function MainScene:ctor()
cc.ui.UILabel.new({
UILabelType = 2, text = "Hello, World", size = 64})
:align(display.CENTER, display.cx, display.cy)
:addTo(self)
end]]--
local cMoveSpeed = 0.3
function MainScene:onEnter()
self.snake = Snake.new(self)
local tick = function()
self.snake:Update()
end
cc.Director:getInstance():getScheduler():scheduleScriptFunc(tick,cMoveSpeed,false)
end
function MainScene:onExit()
end
return MainScene
Snake.lua:
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 tailX,tailY
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
end
--YXXX
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
蛇就是不动！！
