Dear Alan,
Thanks for the reply! Using \definemathstackers I can set the voffset to adjust
the vertical spacing. This is exactly what I needed, thanks!
However, I couldn't use the ahlength variable. I tried different values, but it
doesn't seem to change anything (and the current arrowhead is tiny). (Using
startMPcode and drawarrow gives a big arrowhead.)
Also I noticed that the content of \rightarrow{...} was not in mathmode, so I
tried using middlecommand=\mathermatics (I found this on the wiki and in the
docs). But that doesn't change anything. Is this a bug?
Example:
\useMPlibrary[mat]
\definemathstackers [mp]
[alternative=mp, voffset=-.3\mathexheight, middlecommand=\mathematics]
\definemathextensible [mp] [rightarrow] ["2192]
\startMPinitializations
ahlength := EmWidth ; % Does not work?
ahangle := 30 ;
ahvariant := 1 ;
ahdimple := 4/5 ;
\stopMPinitializations
\setuppapersize[A7]
\starttext
$A \rightarrow{$\neq f$ and $\neq g$} B$
$A \rightarrow{\neq f \text{ and } \neq g} B$ % Is not typeset in mathmode
\stoptext
Thanks in advance,
Kind regards,
Joshua
-----Original Message-----
From: Alan Braslau <braslau.l...@comcast.net>
Sent: 07 August 2018 17:01
To: Joshua Moerman <cont...@joshuamoerman.nl>
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: [NTG-context] xrightarrow is not straight
On Tue, 7 Aug 2018 10:42:01 +0200
"Joshua Moerman" <cont...@joshuamoerman.nl> wrote:
> Hi ConTeXt mailing list,
>
> I am using the extensible arrows and I am not really satisfied with
> the looks of it.
>
> The most important issue I have is that the vertical spacing is too
> much. You can see this in the attached picture: the left arrow is
> using \xrightarrow{\neq a} and the right arrow is using \stackrel{\neq
> a}{\longrightarrow}. I think the right one (with stackrel) looks more
> natural. Is there a way to setup the vertical spacing?
>
> Another thing I noticed is that the line is not very consistent. This
> might be a font issue (I am using Euler). Luckily, the inconsistent
> overlap is barely visible when printed.
>
> Thanks again!
>
> Groetjes,
> Joshua
>
Hello,
You can also use MetaPost to render math stackers, rather than relying on TeX
constructs and any particular font.
For example:
\useMPlibrary[mat]
\definemathstackers
[mp]
[alternative=mp]
\definemathextensible [mp] [leftarrow] ["2190]
\definemathextensible [mp] [rightarrow] ["2192]
\definemathextensible [mp] [leftrightarrow] ["2194]
\definemathextensible [mp] [longleftrightarrow] ["27F7] \definemathextensible
[mp] [rightoverleftarrow] ["21C4]
\definemathextensible [mp] [underbrace] ["FE3DF]
\setupbodyfont [dejavu-condensed,12pt]
\starttext
$\rightarrow{≠a}$
\stoptext
Furthermore, the MP arrow can be tuned
\startMPinitializations
ahlength := .5EmWidth ;
ahvariant := 1 ; % dimpled straight
\stopMPinitializations
as can line widths, etc.
Alan
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