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Some proposed improvements for t-amsl.tex.
by Brooks Moses 02 Aug '04

02 Aug '04

Giuseppe and ConTeXt list members - Having figured out how to use \grabuntil (see my previous messages to this list), I've realized that it's really an inconvenient solution in some cases, because it's searching for a literal bit of text rather than an end to the appropriate grouping level. (Apparently there isn't a way to do the latter in TeX, given that AMSmath's \collect@body also searches for literal text.) This means that, if I write a "LaTeX compatibility function" that does things like define \end{myenvironment} to expand to \stopmyenvironment, my redefinition will not work on any environments using \grabuntil. This inconvenience happens to show up in t-amsl.tex's "align" and "gather" implementations, which is one place where I really need that compatibility function. However, it turns out that there's a simple way to rewrite the implementation so to avoid needing \grabuntil. Mostly, this works on the fact that the definition of Plain TeX's \eqalign function can be split apart into a before and after part, as follows: \def\starteqalign{\null\,\vcenter\bgroup \openup\jot {\mathsurround=0pt}% \ialign\bgroup \strut\hfil$\displaystyle{##}$&$\displaystyle{{}##}$\hfil \crcr} \def\stopeqalign{\crcr\egroup\egroup\,} (This, aside from the \bgroup's and \egroup's, is copied directly from Appendix B of The TeXbook.) Thus, we could expand the instances of \eqalign in the \startalign and \startgather definitions, shuffle things around appropriately, and obtain the following: \def\startalign{\startformula \let\\\cr \starteqalign} \def\stopalign{\crcr\stopeqalign\stopformula} \def\startgather{\startformula \def\\{\cr&}% \starteqalign&} \def\stopgather{\crcr\stopeqalign\stopformula} This exactly duplicates the existing functionality in the t-amsl.tex package. However, that functionality could be improved to be a better match to what's provided in amsmath.tex; in particular, align should accept multiple columns of equations, and gather should center its lines. Thus, I propose that the following redefinitions be included in t-amsl: \def\startalign{\startformula \let\\\cr \null\vcenter\bgroup \openup\jot {\mathsurround=0pt}% \everycr={}\tabskip=4pt plus1fil \halign to \displaywidth\bgroup \strut\hfil$\displaystyle{##}$% \tabskip=0pt &$\displaystyle{{}##}$\hfil% \tabskip=4pt plus1fil &&\hfil$\displaystyle{##}$% \tabskip=0pt &$\displaystyle{{}##}$\hfil% \tabskip=4pt plus1fil \crcr} \def\stopalign{\crcr\crcr\egroup\egroup\stopformula} \def\startgather{\startformula \let\\\cr \null\,\vcenter\bgroup \openup\jot {\mathsurround=0pt}% \ialign\bgroup \strut\hfil$\displaystyle{##}$\hfil \crcr} \def\stopgather{\crcr\crcr\egroup\egroup\,\stopformula} Also, a similar method can be used to replicate the split environment (which, unlike the above, should go inside an explicit \startformula and \stopformula pair). I propose the following definition be added as well: \def\startsplit{% \let\\\cr \null\,\vcenter\bgroup \openup\jot {\mathsurround=0pt}% \ialign\bgroup \strut\hfil$\displaystyle{##}$&$\displaystyle{{}##}$\hfil \crcr} \def\stopsplit{\crcr\egroup\egroup\,} This still doesn't address the fact that the lines in the align and gather environments are not given individual equation numbers as they should be, but I think that is a project for another day. - Brooks P.S. A question: is it intentional that the array environment in t-amsl produces notably different spacing than LaTeX's array environment?

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Re: [NTG-context] Best source of ConTeXt documentation?
by Paulo Ney de Souza 02 Aug '04

02 Aug '04

>From ntg-context-bounces(a)ntg.nl Mon Aug 2 09:08:22 2004 >From: Hans Hagen <pragma(a)wxs.nl> >To: mailing list for ConTeXt users <ntg-context(a)ntg.nl> >Subject: Re: [NTG-context] Best source of ConTeXt documentation? >Cc: > >- it would take a lot of effort to keep such a source code repository up >to date and in sync (else too many questions) with the pdf repositoty If we are talking about examples, ones does not need to have the latest manual and the latest source in sync. Just one copy of the manual (that will eventually go old) and one copy of the source. For example, the Calculator, mixing TeX and JavaScript http://www.tug.org/applications/pdftex/calculat.pdf has NOT changed in many years now, so there is no problem maitaining the PDF and the source in sync... >- we only publish documented sources That is an important point ... and the only one I can give credit to, but I still think the abundance of examples, even without documentation, is better than the short of examples. >- i want to stimulate users to writ etheir own styles not to mimick >existing ones (i.e. avoid the 'all tex files look the same' problem) .... >so ... there are no hidden tricks (unless it would bother/confuse >users); and .. things like cover designs i wanna keep for myself if only >to avoid cutting and pasting >Hans Hans: Imitation is indeed the truest form of flattery! Paulo Ney

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Re: [NTG-context] Best source of ConTeXt documentation?
by Paulo Ney de Souza 02 Aug '04

02 Aug '04

This is one of the sore points of ConTeXt and of the development effort. People at Pragma are willing to show off but not willing to share code and teach by example... contrary to most opensource projects I have seen. There is another gallery of examples without source for some pdfTeX material at: http://www.tug.org/applications/pdftex/index.html and as you can see there is a large intersection with the some of the familiar developers at Pragma. Maybe it is time for us to start an group to reverse-engineer some of these files and post them into a public archive. Paulo Ney de Souza >From ntg-context-bounces(a)ntg.nl Sun Aug 1 19:55:39 2004 >From: skhilji(a)tampabay.rr.com >Subject: Re: [NTG-context] Best source of ConTeXt documentation? >To: ntg-context(a)ntg.nl > >I'd like to see the sources of all the PDF files available at pragma-ade. Its much easier to look at examples and learn from it than to ask for complete documentation. > >Salman > > >_______________________________________________ >ntg-context mailing list >ntg-context(a)ntg.nl >http://www.ntg.nl/mailman/listinfo/ntg-context >

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Re: [NTG-context] metaobj and transparent colors with \MPcolor
by Eckhart Guthöhrlein 02 Aug '04

02 Aug '04

On Mon, Aug 02, 2004 at 01:20:27PM +0200, Vit Zyka wrote: > >>input metaobj; > >>beginfig(1) > >> fill fullcircle scaled 1cm withcolor red; > >> color t; t:=(1,1,0); > >> %setObjectDefaultOption("Box")("fillcolor")(t); > >> newBox.test(""); > >> Obj(test).c=origin; > >> drawObj(test); > >>endfig; > >> > >>end. > > > >Your color is not transparent, so it will work as expected: no white > >box. > > ??? > > The example demonstrated that it *IS* drawn white box in the background > of every metaobj object. Exactly as you mentioned. Yes of course. Sorry. > But I had a second look into mpobj.mp and probably find out the white > box tiger. Comment line 750: > unfill BpathObj(n); > I am sure this hack will cause some unpleasant side-effects (e.g. with > shaded boxes) but in some limited situations... Indeed, the hack works for me. Thank you very much for your time and effort! -- Eckhart

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[Fwd: Re: [NTG-context] metaobj and transparent colors with \MPcolor]
by Vit Zyka 02 Aug '04

02 Aug '04

>>input metaobj; >>beginfig(1) >> fill fullcircle scaled 1cm withcolor red; >> color t; t:=(1,1,0); >> %setObjectDefaultOption("Box")("fillcolor")(t); >> newBox.test(""); >> Obj(test).c=origin; >> drawObj(test); >>endfig; >> >>end. > > Your color is not transparent, so it will work as expected: no white > box. ??? The example demonstrated that it *IS* drawn white box in the background of every metaobj object. Exactly as you mentioned. But I had a second look into mpobj.mp and probably find out the white box tiger. Comment line 750: unfill BpathObj(n); I am sure this hack will cause some unpleasant side-effects (e.g. with shaded boxes) but in some limited situations... Vit Zyka

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Re: [NTG-context] metaobj and transparent colors with \MPcolor
by Eckhart Guthöhrlein 02 Aug '04

02 Aug '04

On Fri, Jul 30, 2004 at 12:08:33PM +0200, Vit Zyka wrote: > >Here is my current file, which just gives a white background in the box. > > > >\setupcolors[state=start] > >\setupbackgrounds[page][background=color,backgroundcolor=red] > >\definecolor[Transparent][r=0,g=1,b=1,t=0,a=normal] > >\startreusableMPgraphic{test} > > input metaobj; > > color t; t:=\MPcolor{Transparent}; > > setObjectDefaultOption("Box")("fillcolor")(t); > > newBox.test(btex Transparent? etex) "filled(true)"; > > Obj(test).c=origin; > > drawObj(test); > >\stopreusableMPgraphic > >\starttext > > \reuseMPgraphic{test} > >\stoptext > > Sorry I still do not see your white box. Perhaps something is corrupted > in my context installation. > > I had a quick look into mpobj source and I tried to remove default white > background, but I was not successful. Me either. > Vit Zyka > > P.S. I played with raw MP code: > > input metaobj; > beginfig(1) > fill fullcircle scaled 1cm withcolor red; > color t; t:=(1,1,0); > %setObjectDefaultOption("Box")("fillcolor")(t); > newBox.test(""); > Obj(test).c=origin; > drawObj(test); > endfig; > > end. Your color is not transparent, so it will work as expected: no white box. -- Eckhart

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Re: [NTG-context] Best source of ConTeXt documentation?
by skhilji＠tampabay.rr.com 02 Aug '04

02 Aug '04

I'd like to see the sources of all the PDF files available at pragma-ade. Its much easier to look at examples and learn from it than to ask for complete documentation. Salman

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Best source of ConTeXt documentation?
by Brooks Moses 02 Aug '04

02 Aug '04

In my efforts to learn ConTeXt, I'm continually getting stuck by a lack of having complete documentation. For example, consider the \definestartstop command, which I was recently looking at. * In the cont-enp.pdf manual, it's not mentioned. * In the mp-cp-en.pdf manual, there's an example of it, but it's not really very clear what the difference is between what the "commands=" and "before=" options do. In addition, there's no indication whether these are all the possible options or not, or whether there's any way to define a start/stop pair that takes an argument. * In the source, I can find the definitions, but for that particular one there seems to be very little commentary, and I also suspect I'd need to be rather familiar with the ConTeXt core before I could understand it -- I certainly can't see where the "before=" goes in, for instance. And that's about all I know about, other than doing a Google search on the mailing-list archives, which rarely addresses the general stuff. Is this all due to an actual lack of documentation for ConTeXt itself, or is there something large and important that I'm missing? Thanks, - Brooks

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Define new flow chart cell shape
by Pedro Mendonça 01 Aug '04

01 Aug '04

Hi Hans! I'm using the flow chart module and I want to know how to create a new cell shape using MetaPost and assign that new shape to a shape number. Could you give me an example? Thanks. Pedro Mendonca. ___________________________________________________________________________________________ Maisfutebol - a paixão do futebol actualizada ao minuto. Saiba tudo sobre o Euro 2004 e vibre com as emoções do futebol. http://www.maisfutebol.iol.pt/

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[Fwd: Please forward]
by Hans Hagen 01 Aug '04

01 Aug '04

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