因此，我正在 itch.io 上為 game jam 構建游戲，并且我正在使用這個非常簡潔的 Fantasy Console，稱為 TIC-80，可在 tic80.com 上找到。我的問題是，雖然我了解錯誤訊息是什么及其含義，但我不明白為什么它會給我這個錯誤。
錯誤資訊（在 TIC-80 控制臺中）：
>[string "-- title: The Clone
Wars..."]:144: attempt to index a nil
value (field '?')
stack traceback:
[string "-- title: The Clone
Wars..."]:144: in function 'TIC'
有問題的代碼：
-- title: The Clone Wars
-- author: DinoNuggies
-- desc: Help the jedi destroy the clones!
-- script: lua
--Functions
function sign(n) return n>0 and 1 or n<0 and -1 or 0 end
function lerp(a,b,t) return (1-t)*a t*b end
function tablelength(T)
local count = 0
for _ in pairs(T) do count = count 1 end
return count
end
--End of Functions
--Variables
player = {
spr = 256,
sprMod = 0,
x = 1,
y = 1,
vx = 0,
vy = 0,
dirX = 0,
dirY = 0,
flip = 0,
shoot = false,
}
gun = {
t = 0,
spr = 258,
sprMod = 0,
x = 0,
y = 0,
modX = 0,
modY = 0,
flip = 0,
rot = 0,
}
tile = {
r0 = 0,
r1 = 0,
l0 = 0,
l1 = 0,
u0 = 0,
u1 = 0,
d0 = 0,
d1 = 0,
m = 0,
}
m = {
x = 0,
y = 0,
left = false,
right = false,
middle = false,
}
cam = {
activate = true,
x = 120,
y = 64,
}
--Bullet Class & Functions
bulletMod = 0
bullet = {}
function bullet:new()
local this = {
spr = 260,
x = player.x,
y = player.y,
vx = 0,
vy = 0,
mx = m.x - (player.x cam.x),
my = m.y - (player.y cam.y),
t = 0,
}
return this
end
function bullet:remove()
local this = {
spr = nil,
x = nil,
y = nil,
vx = nil,
vy = nil,
mx = nil,
my = nil,
t = nil,
}
return this
end
--End of Variables
function TIC()
cls()
--Camera
if cam.activate then
cam.x = math.min(120, lerp(cam.x, 120-player.x, 0.05))
cam.y = math.min(64, lerp(cam.y, 64-player.y, 0.05))
ccx = cam.x / 8 (cam.x % 8 == 0 and 1 or 0)
ccy = cam.y / 8 (cam.y % 8 == 0 and 1 or 0)
end
map(15 - ccx, 8 - ccy, 31, 18, (cam.x % 8) - 8, (cam.y % 8) - 8, 0)
--End of Camera
--Gun Physics
m.x, m.y, m.left, m.middle, m.right = mouse()
gun.x = player.x cam.x
gun.y = player.y cam.y
bullets = tablelength(bullet) - 2
flick = (time() // 16) % 16 == 0
if m.left then m.leftp = flick else m.leftp = false end
--Gun Display
if m.x > player.x cam.x 4 then
gun.flip = 0
gun.modX = 4
else
gun.flip = 1
gun.modX = -4
end
--Gun Firing
if m.leftp == true then
bullet[bullets] = bullet:new()
if m.x > player.x cam.x 4 then
bullet[bullets].vx = 8
else
bullet[bullets].vx = -8
end
end
--End of Gun Physics
--Bullet Physics
if bullets > 0 then
for i=0,bullets-1 do
bullet[i].x = bullet[i].x bullet[i].vx --LINE 144, THE ONE IN QUESTION
bullet[i].y = bullet[i].y bullet[i].vy
spr(bullet[i].spr, bullet[i].x cam.x, bullet[i].y cam.y, 0, 1)
bullet[i].t = bullet[i].t 1
if bullet[i].t > 16 then
bullet[i] = bullet:remove()
bullet[i] = nil
end
end
end
bullets = tablelength(bullet) - 2
--End of Bullet Physics
--Drawing
--Sprites
spr(player.spr player.sprMod, player.x cam.x, player.y cam.y, 0, 1, player.flip)
spr(gun.spr gun.sprMod, gun.x gun.modX, gun.y gun.modY, 0, 1, gun.flip, gun.rot)
--Debug
print("Debug:", 1, 1, 11)
print("X: " .. (player.x // 8) 15 .. " Y: " .. (player.y // 8) 9, 1, 8, 11)
print("BLTs: " .. bullets .. " ", 1, 16, 11)
--End of Drawing
--Player Movement
player.x = player.x player.vx
player.y = player.y player.vy
if key(1) and player.x > -120 then
player.vx = -1
player.sprMod = 1
player.dirX = 0
elseif key(4) then
player.vx = 1
player.sprMod = 0
player.dirX = 1
else
player.vx = 0
end
if key(23) and player.y > -64 then
player.vy = -1
player.dirY = 0
elseif key(19) then
player.vy = 1
player.dirY = 1
else
player.vy = 0
end
if btnp(0) then player.y = player.y - 1
elseif btnp(1) then player.y = player.y 1
elseif btnp(2) then player.x = player.x - 1
elseif btnp(3) then player.x = player.x 1
end
--End of Movement
--Player Collision
tile.r0 = mget(((player.x 7) // 8) 15, ((player.y - 9) // 8) 9)
tile.r1 = mget(((player.x 7) // 8) 15, ((player.y - 2) // 8) 9)
tile.l0 = mget(((player.x - 2) // 8) 15, ((player.y - 9) // 8) 9)
tile.l1 = mget(((player.x - 2) // 8) 15, ((player.y - 2) // 8) 9)
tile.u0 = mget(((player.x - 1) // 8) 15, ((player.y - 10) // 8) 9)
tile.u1 = mget(((player.x 6) // 8) 15, ((player.y - 10) // 8) 9)
tile.d0 = mget(((player.x - 1) // 8) 15, ((player.y - 1) // 8) 9)
tile.d1 = mget(((player.x 6) // 8) 15, ((player.y - 1) // 8) 9)
if player.dirX == 1 then
if fget(tile.r0, 0) or fget(tile.r1, 0) then
player.vx = 0
end
elseif player.dirX == 0 then
if fget(tile.l0, 0) or fget(tile.l1, 0) then
player.vx = 0
end
end
if player.dirY == 0 then
if fget(tile.u0, 0) or fget(tile.u1, 0) then
player.vy = 0
end
elseif player.dirY == 1 then
if fget(tile.d0, 0) or fget(tile.d1, 0) then
player.vy = 0
end
end
--End of Player Collision
--Misc
if keyp(3) then
if cam.activate then
cam.activate = false
else
cam.activate = true
end
end
--End of Misc
end
--DON'T WORRY ABOUT ANYTHING PAST THIS POINT, IT'S ONLY SPRITE AND TILE DEFINITIONS FOR TIC-80 VISUALS
-- <TILES>
-- 000:6666666666666666666666666666666666666666666666666666666666666666
-- 001:6666666666566566666666656666666665665666666665666566666666666666
-- 002:6668666666898566666866656666666665665866686689868986686668666666
-- 003:6656556666555556555556555555556555555555665555556556555666655566
-- 016:dddddddeddddddefddeeeeffddeeeeffddeeeeffddeeeeffdeffffffefffffff
-- 017:6226622661266126222222221121112161266126612661265126512665266525
-- 018:6228622661298126222222221121112161266126612681268126512668266525
-- 019:6226522661255126222222221121112151255125612551255126512665255525
-- </TILES>
-- <SPRITES>
-- 000:00cccc000cccccd00cbbbbb0ccbbcbbdcccfefcd0dddddd000ceec0000c00c00
-- 001:00cccc000cccccd00bbbbbd0cbbcbbcdccfefccd0dddddd000ceec0000c00c00
-- 002:000000000000000000000000000eeeed000efff0000ef0000000000000000000
-- 003:0000ed00000eef0000eef0000eef000000eef000000ee0000000000000000000
-- 004:0000000000000000000000000aaaaaa00aaaaaa0000000000000000000000000
-- </SPRITES>
-- <MAP>
-- 000:010101010101010101010101010101010101010101010101010101010101010000000000000000000000101010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 001:010000000000000000000000000000101000101000001000000010101001010000000000100000000000101010000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 002:010001000100010000000000000010000000100010001000100010001001010000000010100000000000101010000000000000001010100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 003:010001000100000000000000000000101000100010001000100010100001010000000010000000000000101000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 004:010001010100010000000000000000001000100010001000100010000001010000000010000000000000101010000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 005:010001000100010000000000000010100000001010000010100010000001010000000010000000000000101010000000000000000000101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 006:010000000000000000000000000101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 007:010000000000000000000000000101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 008:010000000000000000000000000101301010000000000000000000000000000000000000101010000000101000000000000000000010101000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 009:010000000000000000000000000101101010100000000000000000000000000000001010101000000000101000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 010:010000000000000000000000000101101010000000000001111101000000001111111121211111110000101000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 011:010000000000000000000000000101000000000000001000000001000000000000001020101000000000101000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 012:010000000000000000000000000101000000000000011111111101010001010000101010000000000010101000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 013:010000000000000000000000000101000000000010101000000001011101010000101000000000000010100000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- 014:010000000000000000000000000101000000000010101010000000000000010000000000000000000010100000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
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-- 016:010101010101010101010101010101000000000000000000000000000000010000000000000000001010000000000000001010000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
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-- 019:000000000000000000001010000101000000000000000000000000100000000000000000000010101000001111211110000000001010000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 020:000000001000000000001000000101000000000000000000000000101000000000000000001010101000000010101011111100000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 021:000000000000000000001010100101101010000000000000000000000000000000000000101000000000001010200000000011110000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 022:000000000000000000000000000101001010100000000000000000000000000000000010101000000010101010100000000000001111000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 023:000000000000000000000000000101000000000000000000000000000000000000001010100000000010101010000000000000000000110000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 024:000000000000000000000000000101000000000000000000000000000000000000001010100000001020201000000000000000100000001100102001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 025:000000000000000000000000000101000000000000000000000000000000000000101010000000001020100000000000000000100000000011212101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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-- 033:000000000000000000000000000101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- 135:010101010101010101010101010101010101010101010101010101010101010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
-- </MAP>
-- <WAVES>
-- 000:00000000ffffffff00000000ffffffff
-- 001:0123456789abcdeffedcba9876543210
-- 002:0123456789abcdef0123456789abcdef
-- </WAVES>
-- <SFX>
-- 000:020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200304000000000
-- 001:020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200307000000000
-- 002:02000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020002000200020030b000000000
-- </SFX>
-- <FLAGS>
-- 000:00000000000000000000000000000000101010100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-- </FLAGS>
-- <PALETTE>
-- 000:1a1c2c5d2810814428ca9581ffcd7575ae442495482571793c55c22c9dfae20000000000f4f4f494b0c2566c86333c57
-- </PALETTE>
觸發錯誤的是在玩家發射第二顆子彈之后。發射一顆子彈后，子彈在佇列中被創建、顯示和消失，但在第二顆子彈開始存在后，它停止并給我錯誤。我已經改變了很多東西，似乎每次我參考一個子彈物件值時，當存在多個時，它都會向我發送錯誤，這是我不明白的，因為我認為我已經用for回圈解決了這個問題。
因此，如果您立即發現任何看起來不太正確的內容，請告訴我，如果您對 TIC-80 或 API 的作用一無所知，我相信 TIC-80 網站可以解釋它比我好多了。
如果您想運行游戲，要查看實際問題并處理代碼，請從網站下載 TIC-80 并運行此檔案：https : //drive.google.com/file/d/18ti0NboNNN9Yog6l_n73usF_eX_86EN4/view ?usp=共享
uj5u.com熱心網友回復：
來看看你的子彈處理
第一次呼叫TIC：
bullets 是 0. 我們添加一顆子彈到 bullet[0]
第二次呼叫：
bullets是 1. 我們在bullet[1]. 現在，當bullets > 0我們進入子彈物理 if 陳述句時。
我們對該專案符號進行一些計算并增加 bullet[0].t
下面的呼叫我們也是這樣做的。我們添加一個專案符號并像上面一樣處理除新專案符號之外的所有專案。當專案符號的t欄位變為> 16我們將其從bullet.
所以首先我們移除最舊的子彈bullet[0]。但是在接下來的呼叫中，我們再次從 開始我們的回圈i = 0。所以bullet[i]是nil，因此索引它bullet[i].x原因所觀察到的誤差。
邊注：
這沒有任何意義。
function bullet:remove()
local this = {
spr = nil,
x = nil,
y = nil,
vx = nil,
vy = nil,
mx = nil,
my = nil,
t = nil,
}
return this
end
一個包含所有 nil 值的表只是一個空表。所以只需回傳一個空表。
最重要的是，您不需要該功能，因為它沒有任何用處。
bullet[i] = bullet:remove()
bullet[i] = nil
第一行是不必要的。您不必先分配一個空表，然后再分配 nil。只需分配nil.
如果您只是將專案符號保留在表格的陣列部分中，您就不需要自己的 tablelength 函式，然后減去 2 btw。然后，您還可以使用 table.remove 洗掉專案符號，而不會在專案符號串列中產生意外間隙。
轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/384537.html
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