Otared Kavian wrote :

Hi David, Hi all Contexters,

Sorry for being late in answering.

I just tried to test your code but did not succeed in showing things step by step, even after adding: \def\Subject#1{\centerline{\bf #1}} \setuppapersize [S6][S6] \setupcolors[state=start] and changing the commands \[ and \] (which are probably from a LaTeX background) into \startformula and \stopformula.

What I get doesn't show any step, but only one or two pages with several "Slide Title", and the items you had in your example, on it, and one or two pages with "Navier-Stokes equation".

Am I missing something? Could you please send me (if necessary off List) a source file of yours which is completely working?

Best regards: OK

Oh sorry for not being clear about it. I was assuming that some presentation module would be imported, for instance: \usemodule[pre-original] So probably there lacks a \page command in your \Subject definition. About the \[ and \]: you're right. I was using the amsl module from Giuseppe Bilotta. Thanks for your remarks. :-) So, assuming that the steps code is in a file name t-rsteps.tex, the complete example would be: ---------------------------------------------------------- \usemodule [pre-original] \usemodule [rsteps] \starttext \StartSteps[Slide Title] % the title is passed to % the \Subject macro \startitemize \item Item 1 \OnlyStep[2] {\item (oops!)} \UntilStep[4] {\item Item 2*} \FromStep[4] {\item Item 2} \stopitemize \StopSteps \StartSteps[Navier||Stokes equation] \startformula \frac{D\vec u}{Dt} = \FromStep[2][reserve]{-{\red \frac1\rho \vec\nabla p}} \FromStep[3][reserve]{+\;{\green \vec g}} \FromStep[4][reserve]{+\;{\blue \frac1\rho \vec\nabla\cdot S}} \stopformula Momentum transport: \NextStep \item {\red Pressure gradient} \par\NextStep \item {\green Gravity} \par\NextStep \item {\blue Stress (viscous, turbulent, Maxwell)} \StopSteps \stoptext ----------------------------------------------------------

Otared Kavian wrote :

Hi David,

Thanks for the details. Indeed I get now what is expected from your macros, and as a matter of fact the result is much much better than that of my crude macros... You did a great improvement! So I am going to use yours from now on: thanks again!

If I can suggest a possible improvement to the t-rsteps.tex macros, it is the following: When one uses these macros with an automatic numbering such as \placeformula[equation-reference] (see the example below), with each invocation of \page (that is a step) the number increases, and this is an unwanted side result. Would it possible to "freeze" the numbering procedure in such a way that the number doesn't change in each step? (When I was using my macros, I didn't use \placeformula in sildes with steps, but rather an old \leqno from plain TeX).

Excellent idea indeed! Here's the fix. It is obviously not optimal, though it allows for multiple formula numbers on the same slide. Try it with: texexec --pdf --mode=demo t-rsteps Thanks for your advice. David ------------------------------------------------------------ %D \module %D [ file=t-rsteps, %D version=2004.11.08, %D title=\CONTEXT\ User Module, %D subtitle=Raw steps for slides, %D author=David Munger, %D date=\currentdate, %D copyright={David Munger}] % Thanks to Otared Kavian whose work inspired this module, % and who contributed to its development. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % steps for slides %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \unprotect \newif\ifUseSteps \UseStepstrue % \UseStepsfalse \definecolor [highlightcolor] [blue] \long\def\StartSteps[#1]#2\StopSteps{% \begingroup% \let\steps@number\plusone% \let\steps@counter\plusone% \ifUseSteps% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Workaround to make formula numbers "stick" \def\placeformula[##1]{% \incrementnumber[formula]% \expandafter\xdef\csname steps@eqnum##1 \endcsname{\rawnumber[formula]} \expandafter\xdef\csname steps@eqnum \endcsname{\rawnumber[formula]} \dodoubleempty\doplaceformula[##1]} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \loop% \let\steps@autocounter\zerocount% \Subject{#1}\par\steps@startstep#2\steps@stopstep% \steps@updatenumber\steps@autocounter% \ifnum\steps@counter<\steps@number% \increment\steps@counter% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Workaround to make formula numbers "stick" \def\placeformula[####1]{% \setnumber[formula]{\csname steps@eqnum####1\endcsname}% \setfalse\incrementformulanumber% \dodoubleempty\doplaceformula[####1]} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \repeat% \else% \Subject{#1}\par\steps@startstep#2\steps@stopstep% \fi% \endgroup} \def\NextStep{\steps@stopstep\steps@startstep} \def\OnlyStep[#1]{% \steps@updatenumber#1% \def\steps@cond{\steps@counter=#1}% \dosingleempty\steps@dostep} \def\FromStep[#1]{% \steps@updatenumber#1% \let\steps@tmpcounter\zerocount% \increment(\steps@tmpcounter,#1-1)% \def\steps@cond{\steps@counter>\steps@tmpcounter}% \dosingleempty\steps@dostep} \def\AfterStep[#1]{% \steps@updatenumber#1% \def\steps@cond{\steps@counter>#1}% \dosingleempty\steps@dostep} \def\UntilStep[#1]{% \steps@updatenumber#1% \def\steps@cond{\steps@counter<#1}% \dosingleempty\steps@dostep} \def\HighlightStep[#1]#2{% {\UntilStep[#1]{#2}\OnlyStep[#1]{\highlightcolor #2}\AfterStep[#1]{#2}}} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % internal macros %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \newcounter\steps@counter \newcounter\steps@autocounter \newcounter\steps@number \newcounter\steps@tmpcounter \def\steps@startstep{% \increment\steps@autocounter% \def\steps@hide{no}% \ifUseSteps% \ifnum\steps@autocounter>\steps@counter% \def\steps@hide{yes}% \fi% \fi% \starthidden} \def\steps@stopstep{\stophidden} \def\steps@updatenumber#1{\ifnum\steps@number<#1% \doglobal\let\steps@number\zerocount% \doglobal\increment(\steps@number,#1)\fi} \defineframedtext [step@frame] [offset=overlay,width=broad,height=fit,frame=off] \def\starthidden{\startstep@frame[empty=\steps@hide]} \def\stophidden{\stopstep@frame} \long\def\steps@dostep[#1]#2{% \processallactionsinset [#1] [ reserve=>\let\steps@next=\steps@dostepreserve, \s!default=>\let\steps@next=\steps@dostepnoreserve] \steps@next{#2}} \long\def\steps@dostepreserve#1{% \def\steps@hide{no}% \ifUseSteps% \ifnum\steps@cond\else% \def\steps@hide{yes}% \fi% \fi% \ifmmode\expandafter\mframed\else\expandafter\framed\fi% [empty=\steps@hide,frame=off,offset=overlay]{#1}% \ifmmode\;\fi} \long\def\steps@dostepnoreserve#1{% \def\steps@next{#1\ifmmode\;\fi}% \ifUseSteps% \ifnum\steps@cond\else\def\steps@next{\relax}\fi% \fi\steps@next} \protect \doifnotmode{demo}{\endinput} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % usage example %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \usemodule [pre-original] \usemodule [rsteps] \starttext \StartSteps[Slide Title] % the title is passed to % the \Subject macro \startitemize \item Item 1 \OnlyStep[2] {\item (oops!)} \UntilStep[4] {\item Item 2*} \FromStep[4] {\item Item 2} \stopitemize \StopSteps \StartSteps[Navier||Stokes equation] \placeformula[eq:incompressibility] \startformula \vec\nabla\cdot\vec u = 0 \stopformula \placeformula[eq:NS] \startformula \frac{D\vec u}{Dt} = \FromStep[2][reserve]{-{\red \frac1\rho \vec\nabla p}} \FromStep[3][reserve]{+\;{\green \vec g}} \FromStep[4][reserve]{+\;{\blue \frac1\rho \vec\nabla\cdot S}} \stopformula Momentum transport: \NextStep \item {\red Pressure gradient} \par\NextStep \item {\green Gravity} \par\NextStep \item {\blue Stress (viscous, turbulent, Maxwell)} \StopSteps \stoptext

Otared Kavian wrote :

Hi David,

I could not get through the example file: here is what I get:

Argh... It's because of the line splits in email. I just put the file on my website: http://cfd.homelinux.org/tex/ Regards, David

Otared Kavian wrote :

Hi David and all ConTeXters,

I was away from my e-mail so I am late in answering. Thank you for the file you put on your site. Indeed everything works as intended (the \placeformula no longer advances with each step), and I think one may suggest to Hans to include this in future distributions.

However, in the spirit of ConTeXters who are always asking for a step(!) towards perfectness, I let you know the following drawbacks of the macros:

1) Somehow the \FromStep[n][reserve] changes the internal mechanism of glue or spaces in displayed formulas. So one needs (as you do in your example) to add \; around operators such as +, -, =. Can one avoid this?

I'm sorry, I'm no TeX/ConTeXt guru and I really have no idea of how to achieve this. I think now we need Hans' help. I have indeed noticed that enclosing an operator between braces breaks the spacing system. Try, for instance: \startformula \vec\nabla\cdot\vec u = 0 \stopformula \startformula \vec\nabla\cdot\vec u {=} 0 \stopformula Unfortunately, using \phatom{=} results in the same broken spacing as second formula.

2) When one refers (see example below) with the command (\in[eq:NS]) to an equation which has been introduced with \placeformula[eq:NS] the interaction makes appear the first instance of that formula, which may be incomplete. Could one have a control over this, that is for instance, in this particular case, make appear the completed equation at the end of the slide made with \StartSteps[Navier||Stokes equation]?

Good point! Here's the fix (file updated on my website): 37c37 < \dodoubleempty\doplaceformula[##1]} ---

\dodoubleempty\doplaceformula}

50c50,54 < \dodoubleempty\doplaceformula[####1]} ---

\ifnum\steps@counter=\steps@number% \def\steps@fnext{\dodoubleempty\doplaceformula[####1]}% \else \def\steps@fnext{\dodoubleempty\doplaceformula}% \fi\steps@fnext}

Now we got rid of the duplicate label warnings. I also added your contribution to the usage example. Thank you. Regards, David

Hans Hagen wrote :

David Munger wrote:

...

I'm sorry, I'm no TeX/ConTeXt guru and I really have no idea of how to achieve this. I think now we need Hans' help.

I haven't followed the discussion so closely, what is the problem?

We're trying to implement steps-without-JavaScript for slides. You can get the module here: http://cfd.homelinux.org/tex/ The current problem, in its simplest form, is that using \mframed breaks the spacing. Minimal example: \starttext We aim to get this spacing: \startformula a + b \stopformula but when using: \startformula a \mframed{+ b} \stopformula we get the same broken spacing as in: \startformula a {+ b} \stopformula \stoptext

eh ... are you redefining low level macros?

I'd never dare to... ;-) Just overriding \placeformula within \begingroup/\endgroup to mangle the formula numbers. Thank you, David

1) Somehow the \FromStep[n][reserve] changes the internal mechanism of glue or spaces in displayed formulas. So one needs (as you do in your example) to add \; around operators such as +, -, =. Can one avoid this?

Hi Otared, I can give only explanation but in the moment i do not know the automatic solution. Mathematical material are processed in a pieces called atoms. There are 13 different atoms types (ord, op, bin, rel, open, close, punc, ...). Mathematical characters (+, =, ...) have implicit types (bin, rel; in the case) or they can be set explicitly (\mathrel{<}, \mathop{\hbox{sin}}). Spacing in mathematical mode is done according to types of neighbour atoms. TeX can add A) no space B) \mskip\thinmuskip C) \mskip\medmuskip D) \mskip\thickmuskip between atoms if it is surrounded from left or right with ord op close inner D) REL D) ord op open inner ord close inner C) BIN C) ord op close inner PUNCT B) ord op rel open close punct inner ord close inner B) OP B) ord op ord op close B) INNER B) ord open punct inner If no pair is in this table (ord-ord) no space is added. (Read the table as left-pair and right-pair not as triples.) Example: 1+1=2 expands like \mathord{1}\mathbin{+}\mathord{1}\mathrel{=}\mathord{2} and typeset like \mathord{1}\C\mathbin{+}\C\mathord{1}\D\mathrel{=}\D\mathord{2} (abbreviated by \def\B{\mskip\thinmuskip} etc.) But there are some exceptions (e.g. bin is changed to ord if nothing bin op rel open punct BIN rel close punct ). It makes things more difficult. So in your case the math is broken (by steps) into several separates that is why the atom neighbourhood is lost. Example. Our 1+1=2 equation can be split to $1$$+1=2$ and mathbin + changes to ord and we lose space before (beginning of math) and after (will be ord-ord pair). In this trivial example it can be solved by $1$$\mathord{}+1=2$ According to me, mathematical text has to be tuned manually in the normal case; this spacial one is not a exception ;-( Vit Zyka 2. bin 3.

2) When one refers (see example below) with the command (\in[eq:NS]) to an equation which has been introduced with \placeformula[eq:NS] the interaction makes appear the first instance of that formula, which may be incomplete. Could one have a control over this, that is for instance, in this particular case, make appear the completed equation at the end of the slide made with \StartSteps[Navier||Stokes equation]?

Best regards: OK

%%%% file steps-david-3.tex %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % usage example %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\usemodule [pre-original] \usemodule [rsteps]

\starttext \StartSteps[Slide Title] % the title is passed to % the \Subject macro

\startitemize \item Item 1 \OnlyStep[2] {\item (oops!)} \UntilStep[4] {\item Item 2*} \FromStep[4] {\item Item 2} \HighlightStep[3]{\item Here is another version of Navier-Stokes equation} \stopitemize

\StopSteps

\StartSteps[Navier||Stokes equation]

\placeformula[eq:incompressibility] \startformula \vec\nabla\cdot\vec u = 0 \stopformula

\placeformula[eq:NS] \startformula \frac{D\vec u}{Dt} = \FromStep[2][reserve]{-{\red \frac1\rho \vec\nabla p}} \FromStep[3][reserve]{+\;{\green \vec g}} \FromStep[4][reserve]{+\;{\blue \frac1\rho \vec\nabla\cdot S}} \stopformula

Momentum transport: \NextStep \item {\red Pressure gradient} \par\NextStep \item {\green Gravity} \par\NextStep \item {\blue Stress (viscous, turbulent, Maxwell)}

\StopSteps

\StartSteps[Navier Stokes equation]

\placeformula[eq:div-nul] \startformula \vec\nabla\cdot\vec u = 0 \stopformula

\placeformula[eq:NStokes] \startformula { \partial u \over \partial t} - \Delta u \FromStep[1][reserve]{{\red \; +\; (u\cdot \nabla)u}} \FromStep[2][reserve]{{\green \; +\; \nabla p}} \FromStep[3][reserve]{{\blue \; =\; f(t,x)}} \stopformula

Comments: \NextStep \item Nonlinear equation (same is true for equation (\in[eq:NS]) \par\NextStep \item One should add initial conditions \par\NextStep \item and boundary conditions

\StopSteps \stoptext %%%%%% end file steps-david-3.tex _______________________________________________ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context

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