Phume [Lexaloffle Blog Feed]

All 32 Colours Please

Fri, 01 Jan 2021 05:54:00 UTC

Dear Pico-8 Community,

The darker colour palette should be available without fiddling with memory or coming up with detour functions.

@BoneVolt @Krystman
(via YouTube and such... not dissing! You guys are great <3)

Palette switches were cute,
but this whole schebang has flopped into an inefficient knot (as far as I can tell).

...I wish that first-time-carts from total amateurs (like me) could also use "dark-brown", lol.
...And that expert carts don't all use ~double the amount of available colours.

Perhaps I don't understand the memory limitations.
And I do appreciate (and want to preserve) the elegance of "0-15"/Proof of concept/Simplicity didactics etc..

But the cats' been out of the bag for a while.

@zep could you please greenlight "night mode" [EDIT: in the UI or functions].
Maybe its impossible at this rate. Maybe it wasn't intended this way.

Dunno. Shäre ur thoughts...

Trying to be constructive. Or did I miss something?
It's a super interesting subject, feels almost political.
Happy new year.

x Phume

EDIT: link to @shy 's cool devkit menu experiment https://www.lexaloffle.com/bbs/?tid=41032

Animation Editor (Handheld Compatible)

Wed, 30 Dec 2020 21:29:35 UTC

I'm making a sexy little 16x16 sprite editor with playback and more that should rely on the D-Pad and Buttons. Doing so mainly for use on the Retroflag-GPi case, or any other handheld.

IMPORTANT!
SAVE FUNCTIONS STILL VERY BASIC

Animation Editor (Handheld Compatible)

by Phume

[Click to Play]

UPDATE 11.01.21

Added Move-tool
Added Palette-swapper
Added Tooltips on hover (disable in menu)
Added Save (cart overwrite? dunno?)
Added Export Spritesheet
Added Clear All (Default Empty Project)
Improved usability/ button press consistency

TO DO

Improved Menu Items / File related Functions
Nerf the Mouse
Subtle Sound effects
General Debugging

Give it a go!
Any help/advice/ideas appreciated.

x Phume

thanks to @tjbynum, @paloblancogames, @shy, @mischa_u

Last Smoke (impulse physics)

Fri, 25 Dec 2020 13:50:01 UTC

last smoke (impulse physics)

by Phume

[Click to Play]

Controls: USE ARROW KEYS FOR SUBTLE GRAVITY.

Wanted to share my first proper pico project.
About having only one cigarette left (or not...? what?!)

I used this to make a music video for my band (see youtube embed). DISCLAIMER->GERMAN MUSIC

At the moment it's more of a demo/screensaver, but I would like to turn it into a minigame, or a system of mini games ; if there's fun in it somewhere. So i'm open to ideas :-)

Was thinking of the trope of an "alien brood mother" spitting out mini enemy's. (pack -> cigarettes)
And chaotic controls like only being able to apply gravity/momentum to all objects.

The physics engine is relatively sturdy, except for the lack of Separating_Axis_Theorem, some minor tunnelling and items getting trapped in each other.

I used Chris Heckers impulse physics articles from the 90s and a dynamically subdivided "intra-frame-crawl-while-loop-thingy" to resolve collisions chronologically. and the "Pool hall lessons" article on gamasutra for early false returns (which should be followed by an S.A.T. check which I have yet to write...) So could be waaaay more efficient.

Glad to share some cleaned up functions if anyone needs them (though the code is pretty legible).
important: USES METATABLE CHANGES FOR VECTOR MATH!! (see tab 4 / --metatables--)

Shoutout to the community for the amazing and helpful threads, and specially to lazydev @Krystman for his fantastic (and very funny) youtube series (LG aus Kölle).

Hope you get a giggle out of this one.

Merry Christmas,
Phume

Legit? Checking Line Segment Intersection using AABBs and Linear Functions

Thu, 08 Oct 2020 18:34:33 UTC

Hallo Pico People,

Loving it here. First post!

So i'm working on a 2D physics based collision engine.

...Imagine a whole bunch of polygons flying around, wrapped in AABBs (axis aligned bounding boxes)...

And I was wondering if this was a legit/efficient way to check if Two Edges/Line-Segments Intersect.

1. Treat them as AABBs and check if those overlap, is so keep the "resulting mini rectangle".
-->otherwise abort

2. Treat them as Linear-Functions (infinite strait lines) and check if they are parallel, if NOT determine the resulting "point of intersection"
--otherwise abort

3. check if the "point of intersection" is inside the "resulting mini rectangle".
--return that point, otherwise abort

--do segments intersect? if so where?

function segments(a,b)

 local r=overlap(to_rect(a),
                 to_rect(b))

 if(not r)return false                

 local pt=intersection(a,b)

 if(not pt)return false   

 if(in_rect(pt,r))return pt

 return false  

end

Lets assume the sub-functions (which I haven't included) are squeaky clean, its more about the idea...
Have to say it works a charm at the moment, even on weird concave polygons. But I could be going mad.

Any tips? Would it be easier on the CPU to use dot/cross product stuff? Am I missing something?

Luv, Phume

ps. here's a drawing