Flip sequence determines whether hypoteneuse runs down from left or up; swap sequence determines whether the pattern lays out from left or right.
Colour sequences determine colour advancement horizontally and vertically.

Loops

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Apr 10

Apr 10

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

More fun with OEIS integer sequences.

Today we'll make some pseudospirals: a sequence of arcs with 90 degree turns in between, where the radii are driven off a sequence. Arcs may have a gain function applied. Negative radii flip direction.

A200437: Number of -n..n arrays x(0..9) of 10 elements with zero sum and no two or three adjacent elements summing to zero
Sequence negation (every 17th), no gain

A circular chain of four square spirals with the boxes filled in with curves of pale yellows and blues.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Apr 8

Apr 8

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Loops

1. Download sequence data from OEIS.org
2. Pick a random one
3. Take seq mod k to determine a turning angle from -90 to 90
4. Walk the sequence

Here we have k=5
A111569: a(n) = a(n-1)+a(n-3)+a(n-4) for n>3, a(0)=-1, a(1)=1, a(2)= 2 a(3)=1
5 angles

An intricate 8-way radially symmetrical design of intersecting red lines with an 8-pointed star in the middle. There are slight variations in the shades of red.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Apr 7

Apr 7

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Bleed

Dark red streaks fall from the top, gathering at the bottom. Lines of maroon, white, and black, dotted. You get something of a the texture of old painted wood, perhaps.

#SVG #XQuery #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Apr 2

Apr 2

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Vertigo

Playing around with roll, pitch, and yaw

A plethora of grey rectangles of various sizes -- some dark, some light -- floating in space, casting shadows on a grey plane below them. The rectangles are tilted in space slanting downwards slightly towards the bottom left corner. We're falling through a field of rectangles and the ground is far below.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Mar 26

Mar 26

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Fireworks

Sines and cosines FTW

A sphere of shiny sparks in a variety of luminous colours arranged in whorls and starbursts floating in the black void. We're watching a world-wide fireworks display. Or some phosphorescent deepsea creature.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Mar 16

Mar 16

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

I was working on a technical paper and got a little bored... a little bit of image hackery and a late entry for #Caturday I suppose

A white cat lies near a string, but she is repeated over and over in diminishing arcs towards the bottom left corner. Intermixed with the cat is some foliage. On leafed branch is clear in the middle of the canvas, but it all just smears out at the bottom right, as if we are capturing an image of motion.

Colophon: Take two images (here one of Halki playing and a leafy branch framed against a blue sky and stone wall) with Reinhard tone mapping applied. Apply a mutation function to the pixels (here a bipolar coordinate transform and a crumpling towards the center), and then pick the most extreme luminance (either high or low) from the two matrixes for the final result.

Hilarity ensues.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Mar 6

Mar 6

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Today we take the fractal arc waves and take them on a little trip along smooth meanders

The background is a gorgeous deep blue gradient (deepsea=CET-L15). I could stare at it for hours it is so lovely. Fractal waves formed of arcs within arcs within arcs tumble along the path of a smooth meandering curve that rises and falls and loops back on itself. The waves are shades of green (bathymetry).

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Mar 5

Mar 5

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

Spiky

Taking the fractal arc-circle waves from the last set and rotating them around the center

A flower with six-fold symmetry. The petals are formed from arcs within arcs forming curves and spikes in various colours: black and purples. The center is white with wicked looking curved spikes protruding into it; the background is a pale green. There is something vaguely menacing about it somehow, like a detail in a horror film that tells you things are about to get very dark and dangerous.

#XQuery #SVG #CreativeCoding

**Mary Holstege** @mathling@mastodon.social · Mar 4

Mar 4

Mary Holstege @mathling@mastodon.social

#GenerativeArt interlude

The tempest

$Wild fractal waves fill the bottom half of the canvas: greenish yellow tipped in pink. Looming through the maelstron is an enormous octopus with glowing eyes. The background is a luscious dark blue.$

#XQuery #SVG #CreativeCoding

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