Pico-8 is a virtual machine and fantasy console for making, sharing and playing tiny games. Users create "cartridges" through a Lua-based environment.
Here is the Pico-8 homepage: https://www.lexaloffle.com/pico-8.php
Questions tagged [pico-8]
27 questions
0
votes
1 answer
Why has x become a nil value when I haven't touched it?
I'm learning lua using pico8 by making a platformer, but now that I have added gravity, this error:
Runtime Error line 19 tab 0
local x1=p.x/8
Attempt to perform arithmetic on field 'x' (a nil value)
pops up when the sprite collides with an item…
Yalc06
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- 1
0
votes
1 answer
Attempt to index a nil value in TIC-80
I have two objects that are colliding, and when they do collide, it causes an error. Here is the error:
[string "function _init()..."]:178:
attempt to index a nil value (local 'sprite1')
I am checking every single frame for a collision between the…
Sam Cao
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0
votes
1 answer
Attempt to compare nil with number
I was doing a tutorial in pico8 just a while ago when I ran into this problem when I ran the code:
"Attempt to compare nil with number"
It was specifically refering to line 134, so I am assumming that it refering to the "x" as being nil. However, I…
Sam Cao
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0
votes
2 answers
Lua/pico8: Converting str to variable without access to _G table
I'm looking to iterate over some similarly named variables. a_1,a_2,a_3=1,2,3
So that instead of using:
if a_1>0 then a_1-=1 end
if a_2>0 then a_2-=1 end
if a_3>0 then a_3-=1 end
I can do something like:
for i=1,3 do
if a_'i'>1 then a_'i'-=1 end…
kite
- 309
- 2
- 12
0
votes
1 answer
Transferring 2d boundaries onto its 1d grid
I have a matrix defined mxn 128x128. And I have translated my 2d x,y positions onto this 1D matrix grid. My 2d coordinates accept positions using numbers 0->127 i.e. any combo in ranges {x=0,y=0}-->{x=127,y=127}. I'm implementing algorithms that…
kite
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0
votes
1 answer
Lua equivalent of dictionary.get() method?
How do I access a dictionary using a parameter?
In python I can do dictionary.get(param)
Is there an equivalent to this in lua?
I want to do something like this:
function make_object_from_flag(x, y, flag)
local flag_obj = {
[1] =…
digital_drako
- 103
- 5
0
votes
1 answer
Raycasting bends the World wierdly. PICO-8. (LUA)
I am trying to make a Wolfenstein3D-like game, using pico-8 (that's a 2d engine with many limitations) and the world just bends very weirdly.
Gif of running around
My code: (Warning LUA! Confusing language. starts counting at 1...! )
function…
Nizart
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- 1
0
votes
1 answer
Coding error in Pico 8 code (lua). (Newbie here)
I have recently started coding and wanted to try out Pico-8. A game development platform that uses Lua. I watched tutorials on how to create a platformer and have run into an obstacle with my code. Spid in the code is the name of my main sprite and…
Pterrible
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- 2
0
votes
1 answer
Html issue Iframe,Canvas
I use this gameengine pico8 and you can export a html version of your game. I put it in on my website but now every other iframe frome my website isn´t working the way it should anymore i guess the code from pico8 messed something up but im not…
Delidragon
- 165
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- 17
-1
votes
1 answer
How do I keep the speed of items in a table constant and make them stop moving after I release a button?
I am following a shoot-em-up game tutorial,and I ran into this problem where I want the speed of the stars go faster when I press the up button while they keep their separate colors. Also, the stars should slow down after I release the button.Right…
Sam Cao
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-1
votes
2 answers
'then' expected near ',' but I already place then with Lua
As a complete beginner I'm experimenting on a small code on Pico-8 :
function _update()
if p.x, p.y == 64, 45 then
cls()
print("dead", 37, 70, 14)
end
end
And when I try to run the program an error message appear which says :
'then' expected…
The_berrichon
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- 3
-2
votes
1 answer
lua, iterating and calling all same-named-functions of n=3 tiers of tables
Say I have multiple tables in {game} like {bullets}, where {bullets} has multiple tables as found below. How would I iterate through and call all the update functions contained in {game}?
--Below is a simplified example, Assume each table in…
kite
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