HP 7475A: Superformula Successes

In the course of running off some Superformula plots, I found what must be my original stash of B-size plotter paper. Although it wasn’t archival paper and has yellowed a bit with age, it’s the smoothest and creamiest paper I’ve touched in quite some time: far nicer than the cheap stuff I picked up while reconditioning the HP 7475A plotter & its assorted pens.

Once in a while, all my errors and omissions cancel out enough to produce interesting results on that historic paper, hereby documented for future reference…

A triangle starburst:

Superformula - triangle burst
Superformula – triangle burst
Superformula - triangle burst - detail
Superformula – triangle burst – detail

A symmetric starburst:

Superformula - starburst
Superformula – starburst
Superformula - starburst - detail
Superformula – starburst – detail

Complex meshed ovals:

Superformula - meshed ovals
Superformula – meshed ovals
Superformula - meshed ovals - details
Superformula – meshed ovals – details

They look better in person, of course. Although inkjet printers produce more accurate results in less time, those old pen plots definitely look better in some sense.

The demo program lets you jam a fixed set of parameters into the plot, so (at least in principle) one could reproduce a plot from the parameters in the lower right corner. Here you go:

The triangle starburst:

Superformula - triangle burst - parameters
Superformula – triangle burst – parameters

The symmetric starburst:

Superformula - starburst - parameters
Superformula – starburst – parameters

The meshed ovals:

Superformula - meshed ovals - parameters
Superformula – meshed ovals – parameters

The current Python / Chiplotle source code as a GitHub gist: