Dear Gavin, I have managed to create an implementation for these operations which I think I can convert into functions and put in startMPinclusions and then use them from. there. On Fri, Jan 12, 2024 at 9:42 PM Gavin via ntg-context wrote:

Hi Shiv,

...

Do we have a geometry library for common operations like finding tangents, perpendiculars, circumcircle, orthocenters and such?

I don’t think we have anything like that specifically in the MetaFun world, but if there is a MetaPost package you like, you can use it with MetaFun. For example, the TeX Live installation includes both ConTeXt and 3dgeom.mp, so you should be able to use the 3dgeom package in MetaFun simply with "input 3dgeom" in your MetaPost code. (I did a quick check, successfully drawing a drawing a cube with 3dgeom. I have not tested it beyond than that.)

If there isn’t a MetaPost package for what you want, Lua may be useful for doing the calculations.

Gavin

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-- Respect, Shiv Shankar Dayal

No library that I know of, but drawing tangents (and therefore, perpendiculars) is straight-forward:

https://tex.stackexchange.com/a/108060/323

Circumcircle, orthocenter, etc... are you thinking of triangles or general polynomails?

Triangles. I understand that most of it is very easy, but still a library will help new users. Tikz has Tikz-Euclide and Asymptote has a Geometry package. A similar library for Metafun will be very useful. -- Respect, Shiv Shankar Dayal

Am 13.01.24 um 15:54 schrieb Gavin via ntg-context:

One pretty MetaPost drawing option is the byrne package by Sergey Slyusarev, which he used (with ConTeXt) to reproduce Oliver Byrne’s 1847 quirky edition on the first six books of Euclid’s “Elements”. All of the drawing is in MetaPost, and would work with MetaFun (I think). The LaTeX package is in TeX Live, and the ConTeXt version is at https://github.com/jemmybutton/byrne-euclid/.

The fiziko library by the same author is also very interesting: https://github.com/jemmybutton/fiziko Since it has some pseudo-3D features, maybe you can learn from it. Hraban

Can we please add https://github.com/jemmybutton/byrne-euclid/blob/master/byrne.mp to Wiki because files have a tendency to disappear? Similarly, can we please add https://github.com/thruston/Drawing-with-Metapost/blob/main/Drawing-with-Met... file to Wiki? -- Respect, Shiv Shankar Dayal