[metapost] Metapost dashed evenly option affects lines in TeX labels -- possibly a bug?

[Daniel H. Luecking]

I first encountered this some years ago. The solution is to turn off unwanted draw options when including a TeX formula that has rules in it (this includes fraction bars).

The explanation: the btex...etex group creates a picture which, in your example, contains a path that needs to be drawn (the fraction bar). When that occurs, the current draw options are used.

I seem to recall that some TeX rules are rendered in PostScript as filled rectangles, but many are stoked paths with a particular pen size.

Cheers,

Daniel H. Luecking [luecking at uark.edu]
Department of Mathematical Sciences
1 University of Arkansas
Fayetteville, AR, USA 72701-1201
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From: metapost <metapost-bounces+luecking=uark.edu at tug.org> on behalf of Vadim Radionov <vadim.radionov at gmail.com>
Sent: Friday, June 7, 2024 11:43 AM
To: metapost at tug.org <metapost at tug.org>
Subject: [metapost] Metapost dashed evenly option affects lines in TeX labels -- possibly a bug?

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In texlive2023 this code results in dashed lines in the formula.

beginfig(1)
drawoptions(dashed evenly);
draw btex $\sqrt{22222} \displaystyle {1 \over 22222}$ etex;
endfig;
end

Best regards,
Vadim

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