Homebrew [Release] - LövePotion - LÖVE API for 3DS Homebrew - BETA

Substance12 · Jan 17, 2016

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XavyrrVaati · Jan 18, 2016

Ahhh, I was using .lua, no wonder. Thanks both of you!
EDIT: Lol, I got a half error screen. Left eye sees the error, right eye sees what I want it to, lmao. Trippy.

Substance12 · Jan 18, 2016

XavyrrVaati said:
Ahhh, I was using .lua, no wonder. Thanks both of you!
EDIT: Lol, I got a half error screen. Left eye sees the error, right eye sees what I want it to, lmao. Trippy.

Yeah... turn off the 3D slider or your eyes will fall off

Tobold · Jan 18, 2016

Substance12 said:
Yup, I use it like this:

Code:

require("stuff.stuff.code")

You don't have to write a full path, the points are used as separators, and you don't have to write .lua.

Seperators in what way? In your example, would the full path be:

Code:

/3ds/lovepotion/game/stuff/stuff/code.lua

?

Tobold · Jan 18, 2016

Is there a way for my program to tell if it runs on a 3DS?
Would be cool if it could configure itself on the fly instead of me making different packages.

Substance12 · Jan 18, 2016

Tobold said:
Seperators in what way? In your example, would the full path be:

Code:

/3ds/lovepotion/game/stuff/stuff/code.lua

?

No. The syntax for require is using . as separators, not /, and not writing the file extension.

VideahGams · Jan 18, 2016

Tobold said:
Is there a way for my program to tell if it runs on a 3DS?
Would be cool if it could configure itself on the fly instead of me making different packages.

love.system.getOS() returns '3ds' in LövePotion

haazet · Jan 18, 2016

Substance's Sig reminds me I cant build my project for the life of me. I followed the tutorial linked on the github. I run the make file and it builds until it gets to linking build.elf part and it says i was missing things in my devkitARM\arm-none-eabi like libpng and libjpeg. So I installed those portlibs and that message went away but now its saying I dont have libsf2d and libsfil.

Anyone wants to try it out here is the Main and assets to run. Still needs a lot of work
http://giphy.com/gifs/3o6UB9fUwC82bnWqsg
http://s000.tinyupload.com/index.php?file_id=79154826757403831196

Substance12 · Jan 18, 2016

haazet said:
Substance's Sig reminds me I cant build my project for the life of me. I followed the tutorial linked on the github. I run the make file and it builds until it gets to linking build.elf part and it says i was missing things in my devkitARM\arm-none-eabi like libpng and libjpeg. So I installed those portlibs and that message went away but now its saying I dont have libsf2d and libsfil.

Anyone wants to try it out here is the Main and assets to run. Still needs a lot of work
http://giphy.com/gifs/3o6UB9fUwC82bnWqsg
http://s000.tinyupload.com/index.php?file_id=79154826757403831196

Are you on Windows? I made a guide for compiling under Windows a couple days ago:

https://github.com/VideahGams/LovePotion/wiki/Building-LÖVEPotion

Substance12 · Jan 26, 2016

Fr0zenIce said:
@VideahGams
I setup the font for use, and tried to make it draw "Hello World!"
But i get two white screens..
Could anyone help me with this issue i seem to be having? If they could i would greatly appreciate it.

Your problem is that it's drawing both the background and the text in white. Your code should be like this:

Code:

function love.load()
     love.graphics.set3D(false)
     love.graphics.setScreen('bottom')
     love.graphics.setBackgroundColor(0,0,0) --Black background
     font = love.graphics.newFont("font.ttf",15)
     love.graphics.setFont("font.ttf")
end

function love.draw()
     love.graphics.setColor(255,255,255) --White text
     love.graphics.print('Hello World!',20,20)
end

Substance12 · Jan 26, 2016

Fr0zenIce said:
Thanks for the quick reply! But when running your code i get this error:

Code:

main.lua:6: bad argument #1 to 'setFont' (bad type)

Replace "love.graphics.setFont("font.ttf")" with "love.graphics.setFont(font)"

GalladeGuy · Jan 28, 2016

Fr0zenIce said:
I have another question. (Im sorry)
How could i make my main.lua load another lua file?
For example

Code:

function love.keypressed(key) if key == "select" then I want to load another lua file here

How could i do this?

Code:

function love.keypressed(key)
if key == "select" then
        dofile(/3ds/homebrew-name]/code.lua)
end

I think this is how you do it.

TurtleP · Jan 28, 2016

More likely:

function love.keypressed(key)

if key == "select" then

require ("someluafile")

end

end

The 'someluafile' should be the path to the .lua file you wish to load. I'm not sure why you'd do this, as it's good practice to require any and all .lua files above love.load in global space.

VideahGams · Jan 28, 2016

GalladeGuy said:
Code:

function love.keypressed(key) if key == "select" then dofile(/3ds/homebrew-name]/code.lua) end

I think this is how you do it.

Using dofile() is bad practice, you should use require() instead.

Code:

function love.keypressed(key)
   if key == "select" then
     require('path.to.lua.file') -- Don't add .lua at the end, use dots instead of slashes
   end
end

The path is relative from the game folder, so if you wanted to require game/stuff/character.lua, it would be require('stuff.character')

As TurtleP said above though, you probably just want to require stuff at the top of the script rather than in a function.

Tobold · Jan 30, 2016

VideahGams said:
Using dofile() is bad practice, you should use require() instead.

Just curious, why is that?

XavyrrVaati · Jan 31, 2016

Fr0zenIce said:
Another question! (I really am sorry if im bothering anyone )
Lets say i have a character on the screen, this character has a position of X:25
and Y:25, how can i make it so the character cant go below the 25 X point? Kind of like it can go above 25 but not below.
(Sorry if im not making any sense)

In the logic section (I believe that's the love.update?)
You could do this several ways, I like to do it like this:

Code:

if (player.x + player.xspeed < 25) {
     player.xspeed = 0;
} //sorry if this isn't lua, I think in C++ lol
//What this does is it checks to see if the player's movement would cause the
//player's x value to be below 25, and if it would, it makes the player's speed 0.
//This probably need a little work to be a tiny bit better, but it should work, and
//this how most collision detection would work. (I'm bad at coding so don't actually
// take my word for anything though hhahaha....)

EDIT: This is lua style (I think):

Code:

if player.x + player.hsp < 25 then --player.hsp is whatever you use for your player's horizontal movement!
     player.hsp = 0
end

VideahGams · Jan 31, 2016

Tobold said:
Just curious, why is that?

dofile() loads a file and executes it, require() keeps a track of what you've already loaded so you don't accidentally load the same code twice.
require() is also the Lua standard way of loading modules, at least for Lua 5.1 onwards (LövePotion uses 5.1)

Fr0zenIce said:
Another question! (I really am sorry if im bothering anyone )
Lets say i have a character on the screen, this character has a position of X:25
and Y:25, how can i make it so the character cant go below the 25 X point? Kind of like it can go above 25 but not below.
(Sorry if im not making any sense)

The absolute simplest way of doing that is something like this:

Code:

if character.x < 25 then
   character.x = 25
end

XavyrrVaati · Jan 31, 2016

VideahGams said:
The absolute simplest way of doing that is something like this:

Code:

if character.x < 25 then character.x = 25 end

That works well, but I've seen that cause rubberbanding. Might've done it wrong too. :v /shrug

XavyrrVaati · Mar 13, 2016

I've absolutely rekt my brain on this, but I'm trying to get a finite state machine to work, my code looks like this:
main.lua

Code:

gameStates = {
  intro = {load, draw, update},
  select = {load, draw, update}
}
gameState = 1
require('intro')
require('select')

function love.load()
  --blahblah
  gameStates[gameState]:load()
end

function love.draw()
  --blahblah
  gameStates[gameState]:draw()
end

function love.update(dt)
  --blahblah
  gameStates[gameState]:update(dt)
end

intro.lua

Code:

function gameStates.intro.load()
  --blahblah more code
end
function gameStates.intro.draw()
  --blahblah more code
end
function gameStates.intro.update(dt)
  --blahblah more code
end

When it gets to

Code:

gameStates[gameState]:load()

I get an error saying "Attempt to index field '?' (a nil value)"
It it how I'm calling the function? I've tried other ways but it throws the same error.

VideahGams · Mar 13, 2016

XavyrrVaati said:
I've absolutely rekt my brain on this, but I'm trying to get a finite state machine to work, my code looks like this:
main.lua

Code:

gameStates = { intro = {load, draw, update}, select = {load, draw, update} } gameState = 1 require('intro') require('select') function love.load() --blahblah gameStates[gameState]:load() end function love.draw() --blahblah gameStates[gameState]:draw() end function love.update(dt) --blahblah gameStates[gameState]:update(dt) end

intro.lua

Code:

function gameStates.intro.load() --blahblah more code end function gameStates.intro.draw() --blahblah more code end function gameStates.intro.update(dt) --blahblah more code end

When it gets to

Code:

gameStates[gameState]:load()

I get an error saying "Attempt to index field '?' (a nil value)"
It it how I'm calling the function? I've tried other ways but it throws the same error.

A couple of things are wrong with this.

Code:

function love.update(dt)
  --blahblah
  gameStates[gameState]:update(dt)
end

Calling a table function with a colon, puts the table (aka self) as the first argument.
So technically, it's passing itself as dt, and the actual dt is the second argument.

It's equivalent to:

Code:

gameStates[gameState].update(gameStates, dt)

The second problem is you have a table indexed with strings instead of numbers, so gameStates[1] will return nil.
Instead you should use the string index like so:

Code:

gameStates['intro']

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