On Tue, 7 Aug 2018, Alan Braslau wrote:

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.

Shouldn't we use a dedicated MP instance for stackers? Aditya

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 Sent: 07 August 2018 17:01 To: Joshua Moerman Cc: mailing list for ConTeXt users Subject: Re: [NTG-context] xrightarrow is not straight On Tue, 7 Aug 2018 10:42:01 +0200 "Joshua Moerman" 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