From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/35393 Path: news.gmane.org!not-for-mail From: Aditya Mahajan Newsgroups: gmane.comp.tex.context Subject: Re: \overleftrightarrow Date: Wed, 11 Jul 2007 14:42:39 -0400 (EDT) Message-ID: References: Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1184179674 30520 80.91.229.12 (11 Jul 2007 18:47:54 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Wed, 11 Jul 2007 18:47:54 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Wed Jul 11 20:47:52 2007 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from ronja.vet.uu.nl ([131.211.172.88] helo=ronja.ntg.nl) by lo.gmane.org with esmtp (Exim 4.50) id 1I8hE4-0007RG-WF for gctc-ntg-context-518@m.gmane.org; Wed, 11 Jul 2007 20:47:49 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 94E4820243; Wed, 11 Jul 2007 20:47:48 +0200 (CEST) Original-Received: from ronja.ntg.nl ([127.0.0.1]) by localhost (smtp.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 28887-05; Wed, 11 Jul 2007 20:47:46 +0200 (CEST) Original-Received: from ronja.vet.uu.nl (localhost [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 53DD020220; Wed, 11 Jul 2007 20:43:10 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 5A1E21FCEC for ; Wed, 11 Jul 2007 20:43:06 +0200 (CEST) Original-Received: from ronja.ntg.nl ([127.0.0.1]) by localhost (smtp.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 28039-06-2 for ; Wed, 11 Jul 2007 20:42:43 +0200 (CEST) Original-Received: from hackers.mr.itd.umich.edu (smtp.mail.umich.edu [141.211.14.81]) by ronja.ntg.nl (Postfix) with ESMTP id A640A20225 for ; Wed, 11 Jul 2007 20:42:42 +0200 (CEST) Original-Received: FROM aditya.hsd1.il.comcast.net. (c-24-13-179-215.hsd1.il.comcast.net [24.13.179.215]) BY hackers.mr.itd.umich.edu ID 469524A0.3378E.12114 ; 11 Jul 2007 14:42:40 -0400 In-Reply-To: X-Virus-Scanned: amavisd-new at ntg.nl X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: ntg-context-bounces@ntg.nl Errors-To: ntg-context-bounces@ntg.nl X-Virus-Scanned: amavisd-new at ntg.nl Xref: news.gmane.org gmane.comp.tex.context:35393 Archived-At: On Wed, 11 Jul 2007, Jesse Alama wrote: > Hi Aditya, > > Aditya Mahajan writes: > >> On Thu, 28 Jun 2007, Jesse Alama wrote: >> >>> I'm preparing a geometry course using ConTeXt and am impressed with the >>> system so far. One thing I need is to do is typeset various geometrical >>> symbols. It looks like ConTeXt already has the \overleftarrow and >>> \overrightarrow commands, but one thing I'd like to have is >>> \overleftrightarrow, for typesetting the symbol customarily used to >>> denote the line determined by two points. It seems, though, that this >>> isn't available in ConTeXt, or, at least, it is not available by >>> default. I tried looking on the contextgarden and google, but didn't >>> come across anything. Is the \overleftrightarrow command already >>> available? >> >> Actually just adding overleftrightarrow is easy, but better will be an >> interface to easily define such commands. So .... >> >>> If not, what can I do so that I can use it? >> >> ConTeXt uses overleftarrow and overrightarrow as defined in plain >> tex. This does not work in subscripts. >> >> $\overleftarrow{A}$ $\overleftarrow{ABC}$ >> $a_{\overleftarrow{A}}$ $b_{\overleftarrow{ABC}}$ >> >> Here is a solution. First we patch math-ext so that arrowfills take a >> style. Cut Here ------------------%< ---------------------------- >> \unprotect >> >> \def\mtharrowfill#1#2#3#4#5#6#7#8% AM: Added #8 (for displaystyle) >> {$\mathsurround 0pt >> \thickmuskip0mu\medmuskip\thickmuskip\thinmuskip\thickmuskip >> \relax#8#5% >> \mkern-#1mu >> \cleaders\hbox{$#8\mkern -#2mu#6\mkern -#3mu$}\hfill >> \mkern-#4mu#7$} >> >> %D Now we need to make sure that the extensible arrows do not get >> %D affected. So... >> >> \def\domthxarr#1#2#3#4#5% hm, looks like we do a double mathrel >> {\begingroup >> \def\mtharrfactor{1}% >> \def\mtharrextra {0}% >> \processaction[#1] % will be sped up >> [ \v!none=>\def\mtharrfactor{0}, >> \v!small=>\def\mtharrextra{10}, >> \v!medium=>\def\mtharrextra{15}, >> \v!big=>\def\mtharrextra{20}, >> \v!normal=>, >> \v!default=>, >> \v!unknown=>\doifnumberelse{#1}{\def\mtharrextra{#1}}\donothing]% >> \mathsurround\zeropoint >> \muskip0=\thirdoffourarguments #2mu >> \muskip2=\fourthoffourarguments #2mu >> \muskip4=\firstoffourarguments #2mu >> \muskip6=\secondoffourarguments #2mu >> \muskip0=\mtharrfactor\muskip0 \advance\muskip0 \mtharrextra mu >> \muskip2=\mtharrfactor\muskip2 \advance\muskip2 \mtharrextra mu >> \setbox0\hbox{$\scriptstyle >> \mkern\muskip4\relax >> \mkern\muskip0\relax >> #5\relax >> \mkern\muskip2\relax >> \mkern\muskip6\relax >> $}% >> \setbox4\hbox{#3\displaystyle}% AM: Added displaystyle >> \dimen0\wd0 >> \ifdim\wd4>\dimen0 \dimen0\wd4 \fi >> \setbox2\hbox{$\scriptstyle >> \mkern\muskip4\relax >> \mkern\muskip0\relax >> #4\relax >> \mkern\muskip2\relax >> \mkern\muskip6\relax >> $}% >> \ifdim\wd2>\dimen0 \dimen0\wd2 \fi >> \setbox4\hbox to \dimen0{#3\displaystyle}% AM: added dislaystyle >> \mathrel{\mathop{\hbox to >> \dimen0{\hss\copy4\hss}}\limits^{\box0}_{\box2}} >> \endgroup} >> >> \let\domthxarrsingle\domthxarr >> >> %D Now, for defining overarrows. >> >> \def\definemathoverarrow >> {\dotripleargument\dodefinemathoverarrow} >> >> \def\dodefinemathoverarrow[#1][#2][#3]% >> {\ifthirdargument >> \setvalue{#1}{\dohandlemathoverarrow[#2][#3]}% >> \else >> \setvalue{#1}{\dohandlemathoverarrow[\zeropoint][#2]}% >> \fi} >> >> \def\dohandlemathoverarrow[#1][#2]% >> {\mathpalette{\dodohanglemathoverarrow{#1}{#2}}} >> >> % Note: math-pln has \kern-\onepoint, amsmath does not. I keep the >> % kern amount as an option. This is useful with overharpoons. >> >> >> \def\dodohanglemathoverarrow#1#2#3#4% >> {\vbox{\ialign{##\crcr >> #2#3\crcr >> \noalign{\kern#1\nointerlineskip} >> $\m@th\hfil#3#4\hfil$\crcr}}} >> >> \protect >> >> \definemathoverarrow [overleftarrow] [\leftarrowfill] >> \definemathoverarrow [overrightarrow] [\rightarrowfill] >> \definemathoverarrow [overleftrightarrow] [\leftrightarrowfill] >> ------------------------------%<----------------------------------------- To Here >> $\overleftarrow{A}$ $\overleftarrow{ABC}$ >> $a_{\overleftarrow{A}}$ $b_{\overleftarrow{ABC}}$ >> >> $\overleftrightarrow{A}$ $\overleftrightarrow{ABC}$ >> >> $a_{\overleftrightarrow{A}}$ $b_{\overleftrightarrow{ABC}}$ >> >> >> As an added bonus: >> >> \definemathoverarrow [overtwoheadrightarrow] [\twoheadrightarrowfill] >> \definemathoverarrow [overtwoheadleftarrow] [\twoheadleftarrowfill] >> \definemathoverarrow [overrightharpoondown] [1pt] [\rightharpoondownfill] >> \definemathoverarrow [overrightharpoonup] [\rightharpoonupfill] >> \definemathoverarrow [overleftharpoondown] [1pt] [\leftharpoondownfill] >> \definemathoverarrow [overleftharpoonup] [\leftharpoonupfill] >> >> $\overtwoheadrightarrow {XYZ}$ >> $\overtwoheadleftarrow {XYZ}$ >> $\overrightharpoondown {XYZ}$ >> $\overrightharpoonup {XYZ}$ >> $\overleftharpoondown {XYZ}$ >> $\overleftharpoonup {XYZ}$ >> >> There are also underarrows, which will not be too hard to do. I will >> patch math-ext with both overarrows and underarrows. I think that >> there needs to be some "italic correction" for the arrow. It is >> centered on the math box, but the math box is tilted to the right. Any >> way to determine the "correct" horizontal skip that should be added. > > Have your changes been integrated into the ConTeXt code base yet? If > not, how can I use your code? Is it enough to just include the relevant > parts in my project's environment file? Hi Jesse, They have not been integrated into context yet. While changing one of the core macros, one needs to test that it does not break existing documents. I have been busy for the last two weeks and have not been able to do that. In order to use these macro right now, cut between the two lines above (you will need to remove the quotes, or cut from the previous message) and put them in your environment file. Then you can use \overrightarrow in your documents. I will send an updated math-ext in about a week. Aditya ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________