Almost every animation/image there suffers from horrible moiré because a normal browser canvas was not meant for this. Fine line art needs supersampling and high quality filtering.
leptons · 32d ago
You're complaining about a small subset of "dweets" there. There are thousands of great visuals there that are not "fine line art" and do not suffer from what you described. And no, I do not think it "needs a better renderer" as high quality "rendering" is not the point of dwitter.net, the point is producing amazing things in 140 characters of javascript.
jakegmaths · 36d ago
I loved tixy when I first discovered it a few years ago so created this https://www.mathsuniverse.com/tixy (with permission from the original author) with puzzles to solve on the tixy grid. I use it with my computer science students who get really into it.
I was blown away by the little functions at first and I too made a clone to experiment with calculang [1].
I added an evaluation feature (F9) so you can select sub-expressions and see what they do, which was helpful to figure out some patterns (video in [2])
I've been programming for over 40 years, and I can say this is the most fun way I've experienced to learn this kind of thing. It really is fun.
PebblesRox · 33d ago
My 5yo did great on these until he hit #7 and got stuck! I’m helping him with syntax but trying to hold back from giving conceptual hints for now.
I love the instant visual feedback!
frogarden · 34d ago
Why isn't "(sin(i) * (x > 7)) - (i == 5) + (i == 20) + 0.5 * (i == 32)" a solution to puzzle 36?
acomjean · 35d ago
Fun. Thanks!
Works well on phone. The phone keyboard is a bit clumsy but it works (that’s a phone issue)
soegaard · 35d ago
Well done!
chrisjj · 35d ago
> In computer graphics, the origin (0, 0) is top-left rather than bottom-left
Umm...
LocalH · 35d ago
What's wrong with that statement? It has historically and traditionally been true for raster displays, even if there do exist ways to use standard Cartesian-style coordinates with a computer.
taneq · 34d ago
There top left has usually been (0, 0) for hardware pixel coordinates (although even then there’s plenty of exceptions, e.g. mode 13h scrolling) but as a blanket statement about computer graphics in general it’s misleading.
No comments yet
jakegmaths · 35d ago
I'm struggling to see the problem with this statement, other than maybe to add in the word "usually". My students will know of graphs in maths where the origin is always bottom left. When working with HTML canvas and every other computer graphics situation I've worked in, it's top left instead.
ForOldHack · 35d ago
"PostScript uses a coordinate system where the origin is at the bottom-left corner of the page, with the x-axis increasing to the right and the y-axis increasing upwards."
Oscilloscopes use middle-left.
Unreal engine and SketchUp use Screen middle with xy increasing to the right.
in AutoCAD, the user coordinate system is 1/3 of the screen to the left for the origin, with X increasing to the right, and Y increasing upwards.
Almost all raster displays, and memory based programs assume top left, because that is how it was done first - counter intuitive.
Lerc · 35d ago
It it not counter intuitive and the decision extends far earlier than the first displays.
A raster image onscreen is displayed in the order that the data appears when written down. It stands to reason that a data depiction should be in the same orientation as the display orientation. Displays were created by people who read from left to right, top to bottom. If the displays did not follow that order. images would be flipped or rotated when displayed in a data form.
The first pixel written to the display is in the top left because we read from the top left. If writers of another language had have popularised the text, perhaps things might have been different.
Timwi · 34d ago
Why does the BMP file format store the image upside-down though?
It draws a slightly tilted sine wave gradient (i=16y+x so atan(1/16) ≈ 3.6°) whose frequency increases until it starts to alias due ro the limited resolution (cf. Nyquist sampling theorem) and exhibit what’s essentially the wagon wheel effect [1]. Nice illustration of signal processing fundamentals!
I would love something like this in my living room. Especially if it is not just a screen. Maybe a grid of 256 screens? Or inflating balloons? Something easier to make? Just on/off big pixels?
BearOso · 33d ago
Ah, man, with the colors, I thought this was obvious, but it doesn't quite fit the url. But you can still copy, paste in the box:
Strobe warning, especially after about 20 seconds.
skrebbel · 35d ago
Wow this is extremely well done! All the defaults are chosen so well to make simple inputs get pretty results. The interpretation of the result value, the scale of `t`, the colors, it's all not trivial at all to get right! Hats off
That's really fun! I love minimalist sandbox ideas like this.
ninetyninenine · 35d ago
Is there a pattern or animation you can manually animate on those dots that can’t be represented by an equation?
echoangle · 34d ago
If the animation is finite in time and with finite time steps and sample points, I think no. Because you can fit a polygon through any set of points if the polygon has enough dimensions.
tgv · 35d ago
I’m considering that as a load screen animation. Bunch of different functions, and the user will be entertained.
spencerflem · 36d ago
this is beautiful. i love it so much :)
dr_kiszonka · 33d ago
I am impressed by both the website and how good people here are at trig.
chrisjj · 35d ago
> // hit "enter" to save in URL
There's no enter on Android Chrome on phone.
dtagames · 35d ago
The enter key on the phone keyboard works if you tap that message.
xuhu · 34d ago
Is it possible to create a tixy QR code that contains a link to itself ?
GenshoTikamura · 35d ago
Would be cool to implement this physically as an array of iris diaphragms
ur-whale · 34d ago
Why is the "=>" going in the wrong direction ?
yusina · 35d ago
Isn't i == x + 16*y? Why is it needed?
stefanfisk · 34d ago
To make the code cleaner I’d assume.
yusina · 34d ago
I got the impression though that i is the least useful of the bunch.
https://muffinman.io/pulsar/
I wanted to create animations for my LED matrix screen, and I couldn’t find tixy anywhere. Only after I built pulsar I found it again.
Another similar project is https://sliderland.blinry.org/ which uses HTML sliders.
Fun stuff!
https://tixy.land/?code=y%3C7%26%26%28x%2Bsin%28y%29%3C6.4%2...
edit: much better with a negation :)
Almost every animation/image there suffers from horrible moiré because a normal browser canvas was not meant for this. Fine line art needs supersampling and high quality filtering.
No comments yet
I was blown away by the little functions at first and I too made a clone to experiment with calculang [1].
I added an evaluation feature (F9) so you can select sub-expressions and see what they do, which was helpful to figure out some patterns (video in [2])
[1] https://calculang-editables.netlify.app/tixyish
[2] https://www.youtube.com/watch?v=uXUd_-xrycs
I love the instant visual feedback!
Works well on phone. The phone keyboard is a bit clumsy but it works (that’s a phone issue)
Umm...
No comments yet
Oscilloscopes use middle-left.
Unreal engine and SketchUp use Screen middle with xy increasing to the right.
in AutoCAD, the user coordinate system is 1/3 of the screen to the left for the origin, with X increasing to the right, and Y increasing upwards.
Almost all raster displays, and memory based programs assume top left, because that is how it was done first - counter intuitive.
A raster image onscreen is displayed in the order that the data appears when written down. It stands to reason that a data depiction should be in the same orientation as the display orientation. Displays were created by people who read from left to right, top to bottom. If the displays did not follow that order. images would be flipped or rotated when displayed in a data form.
The first pixel written to the display is in the top left because we read from the top left. If writers of another language had have popularised the text, perhaps things might have been different.
Why are device-independent bitmaps upside down? Raymond Chen https://devblogs.microsoft.com/oldnewthing/20210525-00/?p=10...
I think you had to wait for WinG or maybe even DirectX to get normal 1:1 mapping.
OpenGL is so old it had same stupid ideas about coordinates.
In OpenGL is (center, center)
White blood cells attack: https://tixy.land/?code=sin%28x%2Bt%29%2Fcos%28y%2Bi%29%2Bco...
https://fig.sonnet.io
It’s pretty fun because the shape dynamics are time, and not pressure/tilt based, so you need to draw in a rhythm.
Here’s how they work and how they’re implemented:
https://untested.sonnet.io/notes/fig-tree-brushes/
https://tixy.land/?code=sin%28t%29*%281%2Bx%2By%29-x
a radar
https://aem1k.com/world/
https://aem1k.com/qlock/
X Plus Star https://tixy.land/?code=%28sin%28t*0.8*-sqrt%28%28x-7.5%29**...
Sin Sin https://tixy.land/?code=sin%28sin%28i*sin%28t%2F10%29%29%29
Traffic https://tixy.land/?code=sin%28i*i*t*0.0005%29
https://c50.fingswotidun.com/show/?code=28*ddx*%24%3Ay*%243o...*
Quite a fun challenge.
The Suffix is 2<02->P8dus:vs
which is
https://tixy.land/?code=Math.sin%28y%2F8%2By%3C9%26%26Math.a...
https://tixy.land/?code=(y%2Fi*y%2Fsin(x%2Bt))*max(cos(t)%2C...
https://tixy.land/?code=sin%28i%2Bt%29
[1] https://en.m.wikipedia.org/wiki/Wagon-wheel_effect
'Vanishing Curve'
Learned by scrolling far enough right in view source: The last line is editable and eval'd.
Request to author: keep the newlines.
Right. https://tixy.land/?code=alert(%22foo%22)
Now I’m wondering who first published these trig function pixel paint tricks. Somewhere between HAKMEM munching squares and the 80s demoscene?
I would love something like this in my living room. Especially if it is not just a screen. Maybe a grid of 256 screens? Or inflating balloons? Something easier to make? Just on/off big pixels?
(1-sqrt(pow(7.5-x,2)+pow(7.5-y,2))/8)*(y-7.5)
Pokeball.
edit Actually, there's no fixed length, so https://tixy.land/?code=%281-sqrt%28pow%287.5-x%2C2%29%2Bpow...
https://tixy.land/?code=sin%28t*x%29%2Bi%2F256
Tixy.land - https://news.ycombinator.com/item?id=36646163 - July 2023 (2 comments)
Minimal 16x16 Dots Coding Environment - https://news.ycombinator.com/item?id=24974534 - Nov 2020 (37 comments)
https://tixy.land/?code=Math.sin%28t+%2B+Math.atan2%28y+-+7....
Strobe warning, especially after about 20 seconds.
(sin(t) * sin(t) + 0.2) * (sin(y / (cos(t) * cos(t) + 0.7)) + sin(x))
https://tixy.land/?code=floor(t%256)%20%3D%3D%3D%200%20%3F%0...
There's no enter on Android Chrome on phone.
candy lasers redux: https://tixy.land/?code=0.2%2Bsin%28i*t%2F64%29%2B.3*sin%288...
https://tixy.land/?code=Math.sin%28x*t%29%2BMath.cos%28y*t%2...