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matsun
Posts: 4
Joined: Tue Sep 05, 2017 1:21 pm

Stereographic map projections for drawing ellipsoids

Postby matsun » Tue Sep 05, 2017 1:39 pm

I would need to plot with Tikz some 3D drawings of ellipsoids: I am trying to adapt the excellent code provided by Tomas M. Trzeciak for plotting spheres based on stereographic and cylindrical map projections.

Original code: http://www.texample.net/tikz/examples/map-projections/

I started to have a look at the functions but I do not know Tex very well.. Is there anyone skilled in math and Tex who's willing to help me?

I started to check the command \LongitudePlane:
  1. \newcommand\LongitudePlane[3][current plane]{%
  2. \pgfmathsinandcos\sinEl\cosEl{#2} % elevation
  3. \pgfmathsinandcos\sint\cost{#3} % azimuth
  4. \tikzset{#1/.estyle={cm={\cost,\sint*\sinEl,0,\cosEl,(0,0)}}}
  5. }


but I am already lost.. What does [current plane] stand for? What is the output of this function?

Thank you for the support!

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Stefan Kottwitz
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Postby Stefan Kottwitz » Tue Sep 05, 2017 10:46 pm

Hi matsun,

welcome to the forum!

current plane is an parameter of this function. This function/macro is called several times with various planes, that are: xzplane, pzplane, qzplane, and equator.

cm may stand for "coordinate matrix", just a quick guess, as I could not look deeper into the code yet.

Stefan
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