JoshK [Lexaloffle Blog Feed]

bump.lua simple demo (ported to picotron)

Thu, 10 Oct 2024 18:25:41 UTC

bump.lua

(and bump.lua simple demo)

I ported the 'bump.lua' collision library & 'bump.lua simple demo' to Picotron.
Due to the considerate way the library was built, this was actually a pretty easy process :)

bump.lua: https://github.com/kikito/bump.lua
bump.lua simple demo: https://github.com/kikito/bump.lua/tree/simpledemo

Please take note of file 'MIT-LICENSE.txt' found inside the cart. This is not CC.

bump_simple_demo

by JoshK

[Click to Play]

bump.lua

Lua collision-detection library for axis-aligned rectangles. Its main features are:

bump.lua only does axis-aligned bounding-box (AABB) collisions.
If you need anything more complicated than that (circles, polygons, etc.)
give HardonCollider a look. (I don't believe anyone has ported this to Picotron)
Handles tunnelling - all items are treated as "bullets".
The fact that we only use AABBs allows doing this fast.
Strives to be fast while being economic in memory.
It's centered on detection, but it also offers some (minimal & basic) collision response.
Can also return the items that touch a point, a segment or a rectangular zone.
bump.lua is gameistic instead of realistic.

bump is ideal for:

Tile-based games, and games where most entities can be represented as axis-aligned rectangles.
Games which require some physics, but not a full realistic simulation - like a platformer.
Examples of genres: top-down games (Zelda), shoot 'em ups, fighting games (Street Fighter),
platformers (Super Mario).

bump is not a good match for:

Games that require polygons for the collision detection.
Games that require highly realistic simulations of physics - things "stacking up", "rolling over slides", etc.
Games that require very fast objects colliding realistically against each other (in bump, being gameistic, objects are moved and collided one at a time).
Simulations where the order in which the collisions are resolved isn't known.

bump.lua simple demo:

This simple demo creates a world populated by random boxes, and allows to move a player around
using the keyboard arrow keys.
The player has constant velocity and can will "slide" over the boxes without penetrating them,
similarly to some classic games such as Zelda.

Pressing TAB will display some debug information.

FileSearch

Mon, 30 Sep 2024 22:37:31 UTC

FileSearch

Easily search for files in Picotron

Download now: load #filesearch

How to use:

Type your query
Press Enter
- Click the icon to launch to file in its preferred program
- Click the path to open it in FileNav

Think you can do better?

Prove it!
If you're feeling brave you're welcome to dive into my code and take whatever you want for your own carts :D
The FileSearch function in fileSearch.lua will be a good place to start. Also check out jaroWinkler.lua for an example of a similarity function. And you're welcome to ask me how any of this works, but I do not guarantee that I will remember anything :P

Thanks to:

abledbody for their QuickSort implementation: https://www.lexaloffle.com/bbs/?tid=142305
Matthew A. Jaro & William E. Winkler for the Jaro–Winkler distance: https://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance
369px for their fantastic GUI tutorials: https://www.youtube.com/@369px

Earth

Mon, 15 Apr 2024 21:26:27 UTC

earth

by JoshK

[Click to Play]

I saw this post on stackoverflow and thought I'd give it a go in Picotron :P
https://gamedev.stackexchange.com/questions/147193/imitate-a-textured-sphere-in-2d

The earth texture is a downscaled version from this site: https://planetpixelemporium.com/earth8081.html

Change Log:
1.1 - Optimised! From 160% cpu usage to 80% (when rendering a 64*64 pixel image)

Mandelbrot Set

Fri, 12 Apr 2024 21:17:18 UTC

mandelbrot_set

by JoshK

[Click to Play]

WARNING - This takes a ~10s to render so please be patient :P

A naive approach to rendering the Mandelbrot set.
I made this because I wanted to get a better understanding of the maths behind it, so I focused on making the code readable, not fast.

You can customise the colour by changing the parameters of the 'Gradient' function at the top of _init.

You could use this as a screensaver if you really wanted, but I wouldn't recommend it due to how long it takes to load...

ExternalLog

Fri, 05 Apr 2024 19:49:17 UTC

external_log

by JoshK

[Click to Play]

ExternalLog
A basic Log window that can be used with any windowed cart
Running this will open a readme.txt with this same text in it
Look inside to find the actual ExternalLog.lua file
Also see 'Example.lua' to see how to use this

Simple Usage

Place ExternalLog.lua into the same directory as your main.lua
Inlcude the ExternalLog.lua file with: include("ExternalLog.lua")
Call ExternalLogWindow() in _init()
Call Log("Hello World") to add a log message

Other Features
PassPrintToLog():
Call this in _init to be able to use print() to send Log messages
(you can also pass 'false' as a parameter to disable regular printing)
LogMenuItems(OPEN_SHORTCUT, CLEAR_SHORTCUT):
Call this to create menuitems for opening and clearing the Log
(OPEN_SHORTCUT & CLEAR_SHORTCUT should be strings in the form "CTRL-X")

Downloader - GUI for downloading carts from the BBS

Mon, 01 Apr 2024 23:23:59 UTC

Downloader 2.0

by JoshK

[Click to Play]

A windowed app that should make downloading carts a lil' easier!

How to use:

Select a download destination with the dropdown menu.
NOTE: You can click 'Edit' to customise the options available - Make sure to save the .pod & restart Downloader for your changes to take effect.
Click the 'Cart ID' field to enter the Cart ID you want to download.
NOTE: You can use CTRL-V to paste your Cart ID - you don't even need to select the field first!
[OPTIONAL] Edit the 'Cart Name' to change what the name of the file will be after downloading - it will default as the Cart ID.
Click 'DOWNLOAD'
[OPTIONAL] Click 'Open' to open the destination folder, for easy access to your downloaded cart!

Important Info:
This app will auto create the destination directory if it doesn't exist when you click DOWNLOAD!
If that directory is 'Screensavers' or 'Wallpapers', it will also copy over the default carts from the corrosponding /system/ folder.

Also, the colours are based on your theme, so if you think it's ugly... I'm blaming you :P