0xFFFF967F [Lexaloffle Blog Feed]

CMY Platonic Solids

Tue, 18 Feb 2025 10:32:50 UTC

So you know those CMY Cubes? The ones where you rotate them around and the colors mix in the light?

After recently being taught how to mix colors using bitplanes, this idea came to mind, and I just had to make it

CMY Platonic Solids

by 0xFFFF967F

[Click to Play]

The 5 Platonic Solids, in all their CMY glory!

This was actually quite the challenge for me, as I've never messed with 3D rendering before. So I had to learn how to find the vertexes of each polyhedra, and I had to learn how to rotate them using matrix multiplication. But that was all quite fun, and I hope I can use them again in a future project that isn't just basically a gif

The final hurdle was actually filling the polygons in, as Pico-8 doesn't have a built in fill function outside of rectfill() and circfill(). And I certainly wasn't going to make my own fill function.

After an hour of digging, I found "Polygon Drawing Method" by user @paranoidcactus, so a big thanks to them!

Bitplane Mixing Circles

Sun, 09 Feb 2025 02:01:35 UTC

bitplanecircles

by 0xFFFF967F

[Click to Play]

Circles appear with random sizes in cyan, "magenta" (pink), and yellow, and colors drawn over each other mix together.
Press ❎ to clear the screen
Press 🅾️ to switch to RGB (Same palette, but reversed)

I've had an idea for an idle/incremental game that I've been thinking about for awhile, but I never started working on it because the game would involve mixing colors, and I had no clue how I would do that. But recently I learned about bitplanes, and how they can be used to choose draw color based on what pixels were already there, rather than simply overriding them with the selected color.

This an example of using bitplanes to merge colors, using a custom palette and poke(0x5F5E) to change which color is drawn. The first palette is the default palette, while the subsequent three palettes show what everything becomes when the indicated color is drawn over them

I can't completely explain how this works, so if you want to know more, all of this is explained in much greater detain here

There Is No Yellow

Thu, 30 Jan 2025 00:34:46 UTC

There Is No Yellow

by 0xFFFF967F

[Click to Play]

Interactable Color Illusion

❎: Toggle Bars

🅾️: Toggle Circle

⬆️/⬇️: Toggle Size

Final Version now uses Circfill() and Fillp() instead of sprites, allowing for varying sizes

Proleptic Gregorian Calendar

Wed, 09 Oct 2024 17:52:56 UTC

Proleptic Gregorian Calendar

by 0xFFFF967F

[Click to Play]

A calendar for when you need to know what day of the week any date is on but don't want to leave Pico-8 for some reason

⬆️/⬇️ change year
⬅️/➡️ change month
❎/🅾️ change day
❎+🅾️ toggle day highlight

Allows years between -32767 and 32767 because why not?

Disclaimer: This is NOT a historically accurate calendar. This is a Proleptic Gregorian Calendar, a calendar which gives Gregorian dates to all days, including those before it was introduced on October 15th, 1582. Credit to @RealShadowCaster for pointing this out to me

Pico-8 Tetris

Thu, 15 Jun 2023 00:29:37 UTC

Pico-8 Tetris

by 0xFFFF967F

[Click to Play]

Controls:

O - Rotate clockwise
X - Rotate counter-clockwise

O while holding Up - Hold current tetronimo
X while holding Up - Fast drop

Down - Slow drop

Left/Right - Move tetronimo

Floppy Borb 2.0

Sun, 21 May 2023 09:24:50 UTC

Floppy Borb 2.0

by 0xFFFF967F

[Click to Play]