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5

This issue appears to be related to the use of pathpart on the picture returned by glyph. Consider the following program: prologues := 3; outputtemplate := "glyph%c.eps"; beginfig(1); picture a; a = glyph "I" of "cmti12"; draw a withcolor .9 white; draw pathpart a withcolor red; endfig; end. which produces the picture below. You can see the jags ...

2

Two years and a half later, and since Dohyun Kim (author of the luatexkomplib files) maintains luamplib himself, the situation has much evolved in this domain. In particular, since version 2.0 (2013/05) it supports the btex…etex flags directly. So the following code is sufficient to produce the required figure, in the document's current fonts. ...

6

For this sort of semi-technical sketch you might consider Metapost as an alternative tool. Here I've followed my preferred sequence to keep everything nicely organized: define the paths (relative to each other as far as possible); draw them; then add the labels. prologues := 3; outputtemplate := "%j%c.eps"; beginfig(1); % set a unit scale u := 1cm; % ...

7

I don't think it's necessary to use pgfplots. I think you can get the effect you want (and somewhat easier) using just tikz. \documentclass[border=5pt]{standalone} \usepackage{tikz} \usetikzlibrary{calc} \usetikzlibrary{arrows.meta} \begin{document} \begin{tikzpicture} \coordinate (Q) at (0,0); %% put this first even though you can use opacity. ...

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