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])
Works well on phone. The phone keyboard is a bit clumsy but it works (that’s a phone issue)
soegaard 1 days ago [-]
Well done!
chrisjj 1 days ago [-]
> In computer graphics, the origin (0, 0) is top-left rather than bottom-left
Umm...
LocalH 1 days 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.
jakegmaths 1 days 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 1 days 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 20 hours 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 9 hours 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?
Strobe warning, especially after about 20 seconds.
skrebbel 23 hours 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
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://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!
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
Works well on phone. The phone keyboard is a bit clumsy but it works (that’s a phone issue)
Umm...
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.
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
https://aem1k.com/world/
https://aem1k.com/qlock/
a radar
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)
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?
https://tixy.land/?code=(y%2Fi*y%2Fsin(x%2Bt))*max(cos(t)%2C...
https://tixy.land/?code=sin%28t*x%29%2Bi%2F256
Strobe warning, especially after about 20 seconds.
(sin(t) * sin(t) + 0.2) * (sin(y / (cos(t) * cos(t) + 0.7)) + sin(x))
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=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...
Now I’m wondering who first published these trig function pixel paint tricks. Somewhere between HAKMEM munching squares and the 80s demoscene?
https://tixy.land/?code=Math.sin%28x*t%29%2BMath.cos%28y*t%2...