Re: [Gimp-developer] Plug-In Golden ratio on Github/Youtube

[Ofnuts <ofnuts gmx com>]

Search a research paper widely available in the net as a PDF:

 "Piecewise Circular Approximation of Spirals and Polar Polynomials"

It describes how you can approximate a linear spiral using circle arcs.
You can then use Gimp paths to create the arcs. There is a well known
approximation
or a circle arc with a Bezier spline (Gimp paths are actually Bezier
splines)(search "Bezier kappa"), so you just string the circle arcs into
a path, that you render. You can describe your spiral with 4 control
points (12 if you include tangents) per turn.

If you are not too familiar with Paths, see:
https://www.gimp-forum.net/Thread-Paths-Basics

If you want examples of scripts that use Gimp's vectors/paths, see:
http://sourceforge.net/projects/gimp-path-tools/files/scripts/
In particular see: golden-spiral-0.0.py

On 22/02/2021 18:31, José E Uzcategui via gimp-developer-list wrote:
> Hello:
> I have developed a plug-in to add layers of golden ratio circles, squares
> and a spiral .
> I create spiral by writing each point, it seems to be slow but accurate.
> Would you advise any method alternative?
>
> https://youtu.be/CC1l9RPhpJM
> https://github.com/JoelHz/goldenratioGimpPython.git
>
> thanks in advance.
> _______________________________________________
> gimp-developer-list mailing list
> List address:    gimp-developer-list gnome org
> List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
> List archives:   https://mail.gnome.org/archives/gimp-developer-list