T * sin (t)' ≈ Ornamented Christmas Tree (2013)

ryeguy_24 · 2024-12-25T01:07:22 1735088842

Merry Christmas HN. Ever year, the original T * sin(t) Christmas tree gets posted. This year, I wanted to call out my favorite modification by Silvia Hao. It’s beautiful. One year, I’ll try to add to its beauty. But for now, I’ll just appreciate it. She posted it here: https://community.wolfram.com/groups/-/m/t/175891

JadeNB · 2024-12-25T15:38:57 1735141137

I checked the post, but it's from someone who's far more comfortable with Mathematica than I am, so I hope you won't mind my asking about the maths.

First, the T vs. t in T * sin(t) doesn't mean anything, right? Second, the ' in the title T * sin(t)' doesn't belong, right?

Then I think that this is graphing essentially (t * sin(t), t * cos(t), t + something), which is a cone if the something is constant, which I believe it is—and that certainly matches the graph. And the rest is about choosing an aesthetically pleasing step size and accomplishing the lovely twinkling and colors, right?

Arnavion · 2024-12-25T06:10:48 1735107048

Silvia Hao's version is the one submitted here to HN, actually.

dylan604 · 2024-12-25T08:54:59 1735116899

Someone was too excited about Santa to actually you know click the link

frogulis · 2024-12-25T09:37:37 1735119457

The GP commenter (ryeguy_24) is the original poster of this article, leaving additional information about what they posted.

acer4666 · 2024-12-25T09:47:57 1735120077

Some was too excited about Santa to, you know, read the usernames of the submitter and commenter

TheSpiceIsLife · 2024-12-25T11:01:36 1735124496

Some kind of Pareto Principle: 80% of people read 20% of the usernames.

deskr · 2024-12-25T13:40:19 1735134019

Wrong. It says that 20% of people will argue with you and be confident that they are right even though they are more wrong.

romanobro56 · 2024-12-25T13:44:52 1735134292

Pareto victim right here

JadeNB · 2024-12-25T15:33:59 1735140839

> Pareto victim right here

I'm pretty sure deskr was making a joke.

jll29 · 2024-12-25T11:22:20 1735125740

That's a beautiful animation (and useful maths ;-).

In the spirit of minimalism, Merry Christmas to all HNers with this little but time-tested command:

  $ xmastree 5 9 2024`
                                *
                               ***
                              *****
                             *******
                                *
                               ***
                              *****
                             *******
                                *
                               ***
                              *****
                             *******
                                *
                               ***
                              *****
                             *******
                               ***                              
                               ***                              
                               ***                              
                               ***

Source: https://github.com/jochenleidner/ltools/blob/main/src/bin/xm...

Lerc · 2024-12-25T09:42:21 1735119741

I made this Bauble dweet as a Christmas themed exercise in 2020 https://www.dwitter.net/d/20993

    function u(t) { 
        t||(c.width/=6)  // shrink canvas to 1/6 at t==0
        M=a=>x.filter=a?"none":"blur(1px)brightness(90%"
        M();x.drawImage(c,0,0)
        for(i=n=90;--i;)
          x.fillRect(
           160-S(X=i+t*4)*(1-(v=C(i*n))*v)*n,
           v*n+n,
           4,
           2,
           x.fillStyle="#F"+(i+10),M(C(X)<0))    
    }

with u(t) is called 60 times per second. t: elapsed time in seconds. c: A 1920x1080 canvas. x: A 2D context for that canvas. S: Math.sin C: Math.cos

belter · 2024-12-25T14:03:21 1735135401

Happy Festive Season! A nice one from Desmos: https://www.desmos.com/calculator/wgunyn2yd0

foobar1962 · 2024-12-25T11:08:14 1735124894

My first time seeing it. Thanks for posting, and thanks to HN for being the kind of place that stuff like this gets posted.

bazzargh · 2024-12-25T13:40:45 1735134045

Here's one I did for the bbcmicrobot using a Chaos Game approach

https://bbcmic.ro/?t=8W1n6

theodpHN · 2024-12-25T08:23:40 1735115020

GIF Xmas Tree, GIF Xmas Tree... https://communities.sas.com/t5/Graphics-Programming/Fun-with...

noduerme · 2024-12-25T10:40:37 1735123237

I went to Hopscotch in Portland with some friends tonight, tried out the "quantum trampoline" [0]... spent most of my time in socks wondering if that was written in plain ol' javascript or p5. Happy Holidays, folks.

[0] https://www.behance.net/kuflex?locale=en_US#

leeoniya · 2024-12-25T03:48:35 1735098515

https://github.com/anvaka/atree

https://js1k.com/2010-xmas/demo/856

http://www.romancortes.com/blog/how-i-did-the-1kb-christmas-...

matsemann · 2024-12-25T09:31:54 1735119114

Here's variants using 140 characters of Javascript: https://www.dwitter.net/h/christmas

theodpHN · 2024-12-25T08:31:21 1735115481

A 'Traveling Santa Tour' Through U.S. Capital Cities https://communities.sas.com/t5/New-SAS-User/Fun-With-SAS-ODS...

theodpHN · 2024-12-25T08:20:07 1735114807

Damped Oscillation Xmas Tree https://communities.sas.com/t5/Graphics-Programming/Fun-With...

Alifatisk · 2024-12-25T11:12:36 1735125156

I think this would be perfect on openprocessing.org, I just don't know how to implement that.

BobbyTables2 · 2024-12-25T04:53:34 1735102414

Now make 30% of the bulbs randomly burn out :)

hippich · 2024-12-25T05:09:49 1735103389

Randomly wouldn't be that bad. But whole segments - way more noticable!

nuodag · 2024-12-25T10:45:03 1735123503

usually a bunch of lights are wired in series, if one burns out all stay dark.

Find and replace the broken one, and all light again!

layer8 · 2024-12-25T03:03:51 1735095831

Or a drill.

block_dagger · 2024-12-25T03:43:55 1735098235

This is not a drill. It really is Christmas.

layer8 · 2024-12-25T04:45:33 1735101933

The function is neither a drill nor a Christmas tree, but similar to how it happens to look (≈) like a Christmas tree, it also happens to look like a drill. This is what I wanted to point out. It’s a multipurpose function.

Uncorrelated · 2024-12-25T06:35:55 1735108555

block_dagger was making a pun based on the sense of drill as a training exercise. A similar joke went over the heads of nearly everyone on a recent episode of Taskmaster:

https://www.youtube.com/watch?v=6PJkA3o_Im0

noduerme · 2024-12-25T10:46:50 1735123610

English being the global language makes it easier to get a lift, but much harder for anyone to pick you up.

DrSAR · 2024-12-25T05:39:03 1735105143

It is also not a pipe

arcticbull · 2024-12-25T07:25:42 1735111542

Cici n'est pas un arbre de Noël tabarnak

bjconlan · 2024-12-25T10:44:45 1735123485

Haha, oh I miss the Quebecois. Appropriation of Catholic vernacular make for the best profanities.

corobo · 2024-12-25T09:17:57 1735118277

I wish I had more to add, but I do not. This proper tickled me, thank you. lmao