因此,我在Lua方面遇到了一个奇怪的问题,我使用以下函数从名为Cube的全局3D“数组”中进行设置,读取和写入。但是,似乎每次读取或写入此“数组”时,尽管Cube是全局变量,但数据仅存储在该函数使用的实例上,不能说我以前从未遇到过,非常奇怪。
-- stole this one from: https://stackoverflow.com/questions/27976526/using-a-coordinate-pair-as-a-key-in-a-lua-table
-- basically the intended use is to store a 2d table of block information for the level the turtle is on
function setUpLevel()
local test = {_props = {}}
local mt = {}
local function coord2index(x, z)
return ((x-1) * xMax) + z
end
mt.__index = function(s, k)
if s._props[coord2index(k[1], k[2])] ~= nil then
return s._props[coord2index(k[1], k[2])]
end
end
mt.__newindex = function(s, k, v)
s._props[coord2index(k[1], k[2])] = v
end
mt.__call = function (t, k)
if type(k) == "table" then print "Table" end
end
setmetatable(test, mt)
return test
--test[{1,2}] = 5
end
function setupCube()
local cube = {}
cube[relY]=setUpLevel()
return cube
end
Cube = setupCube()
function readCubeData(x,y,z)
if (Cube[y]==nil) then
return nil
end
-- debug
return Cube[y][{x,z}]
end
function storeCubeData(x,y,z,data)
if (readCubeData(x,y,z)==nil) then
Cube[y]=setUpLevel()
end
Cube[y][{x,z}]=data
data= readCubeData(x,y,z)
print (x,",",y,",",z,":",readCubeData(x,y,z))
sleep(.5)
end
输出示例:
中的print语句storeCubeData()
将提供的正确输出(顺序无关紧要,仅将数据对应到x,y,z值)
但是下面的打印语句 start()
function start()
detectAndStore()
print("=============")
sleep(1)
data= readCubeData(0,relY,1)
print (0,",",relY,",",1,":",readCubeData(0,relY,1))
sleep(.5)
data= readCubeData(-1,relY,0)
print (-1,",",relY,",",0,":",readCubeData(-1,relY,0))
sleep(.5)
data= readCubeData(0,y,-1)
print (0,",",relY,",",-1,":",readCubeData(0,relY,-1))
sleep(.5)
data= readCubeData(1,y,0)
print (1,",",relY,",",0,":",readCubeData(1,relY,0))
sleep(.5)
end
start()
这只是悲剧性的错误,x,y,z值未指向正确的值,并且表也不打算在相同的x,y,z位置重复。我真的无法为我的生命解决这个问题
错误在if (readCubeData(x,y,z)==nil) then
中storeCubeData(x,y,z,data)
。每当你尝试在其中存储新信息时,你都将覆盖整个“级别”。应该是if (Cube [y] == nil) then
。整个if
语句可以进一步简化为Cube [y] = Cube [y] or setUpLevel ()
。
另外,if s._props[coord2index(k[1], k[2])] ~= nil then
没有必要;功能可以定义为本地;并且hash函数coord2index
将导致冲突(例如coord2index (1, 5) == coord2index (2, -5)
if xMax == 10
),因此将其替换为@Egor Skriptunoff所说的。