Single div Sierpinski triangle | Hacker News Reader

Single div Sierpinski triangle

yuanchuan.dev

142 pointsspirit2313 comments

Y'know, I suspect certain groups of modernist painters would have a field day with CSS. De Stijl for instance would love it. There is something so elegant and fun about using a medium that forces you to use only circles, rectangles and a few select curves under a few simple transformations.

I was visiting a 20th century art gallery and was joking with my friends about which painters could be implemented in CSS (Yves Klein ofc). Maybe I should go ahead and do it. There's a few Mondrians that'd be fairly easy.

You can go pretty darn far with CSS if you are ok with multiple divs...

https://diana-adrianne.com/purecss-francine/

That thing is insane!

Although I guess if you have an arbitrary number of divs, CSS just becomes a much more esoteric equivalent to SVG

Ok. It crashes my galaxy s9s chrome browser so let's put up a warning about it being an insane browser expwriment

That's weird - works fine on Chrome on my s8

Seems to be okay on Firefox on my S5 (though it takes a minute to load), in case you want to view it.

> You can go pretty darn far with CSS if you are ok with multiple divs...

Of course, if you're OK with multiple divs, the ultimate extension is to just make a giant rectangular grid of 1x1 pixel divs and color them appropriately.

Or you can use `background-image: url()` in a single div, but that's cheating too ;)

I have made a funny Sierpinski carpet clicker recently, it's only 30 lines of code in react and unfortunately not one div, but it's still quite performant (safe to open, even on low-tier phones)

https://recursivebuttons.mcalus.dev/

i love all kinds of fractal generative art :)

Beautiful. I love that it looks like it’s all being built on its side but then he skews it back and it’s really just been there the whole time, leaning over so you don’t notice the structure.

>Chrome can render as many triangles as possible but Safari and Firefox don't work well as the triangle is getting smaller.

Web is awesome, and browsers are the most advanced tech! But it seems to be hard to draw flipping triangles at fixed coordinates. Maybe that could be fixed with e.g. a special planar geometry library that makes precise calculations. Like 500x3.125%==15.625 and not 27.

I also didn't find a way to reliably draw a non-smooth line on HTML 5 canvas, one that does not use sub pixel rendering.

Sub-pixel rendering is often nice, but when you actually want a simple monochrome diagonal line filling only whole pixels on purpose (because, e.g., you don't want your intended 1-pixel wide black line to become a two-pixel wide gray line, or you're simply making something pixel-arty), the only reliable portable way to do it is to implement bresenham and draw it pixel by pixel yourself...

The standard methods on a canvas that are supposed to make a non-smooth line, such as using exact pixel centers (shift 0.5) and width 1, work in some browsers, not in others, not for some angles of the line, and sometimes it even depends on the width and height in pixels of the canvas whether it'll look smooth or sharp, even for the exact same absolute coordinates of the line.

This is awesome!

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