Hi Otared,

Thanks a lot for you macros. They do the job pretty well. They remind me
of the way Prosper does things. When I have time, I'll try to find out
how to Wiki your post. Thanks again!

David

Otared Kavian wrote :
> Hi David,
> 
> A few months ago I had to use steps in my presentations, but since I 
> could not use thouroughly s-pre-60.tex (and the examples given in 
> s-pre-61.tex) I ended up
> writing a few macros which work fine with ConTeXt and the presentation modules.
> These macros are very elementary and crude, but they work...
> If I succeed to learn how to use layers smartly as does Hans, I will 
> write these macros again. :-)
> 
> Below are the macros and some examples.
> Best regards: OK
> %%%%%%%%%%%% begin test-step-ok.tex
> %%K test-step-ok.tex
> 
> %%K Here we use the plain \TeX\ command \phantom{} in order to have
> %%K some material appear step by step.
> %%K The structure is quite simple, but since I am not very
> %%K familiar with ConTeXt, I cannot write elegant code as does
> %%K Hans Hagen...
> %%K
> %%K An advantage is that the code can be used also in
> %%K plain TeX, in LaTeX and other macro-packages.
> %%K
> 
> \newif\ifSteppingSlide
> \SteppingSlidetrue   %%K this is when you want a step by step presentation
> %\SteppingSlidefalse %%K this is when you want to print the slides
> %
> \newcount\StepsCounter
> \StepsCounter=0
> %
> \newcount\NumberOfSteps
> \NumberOfSteps=10
> %
> \newcount\BeforeStepNumber
> \BeforeStepNumber=0
> %
> %%K StepBetween[number1,number2]{material} will make "material"
> %%K appear between steps "number1" and "number2"
> \def\StepBetween[#1,#2]#3{%
> \ifSteppingSlide
>   \ifnum#1>\StepsCounter \phantom{#3}
>    \else
>      \ifnum#2<\StepsCounter \phantom{#3}
>        \else \relax #3
>       \fi
>    \fi
>    \else {#3}
> \fi}
> %
> %%K Step{number1}{material} will make "material"
> %%K appear beginning with step "number1" until "NumberOfSteps"
> \def\Step#1#2{\StepBetween[#1,\NumberOfSteps]{#2}}
> %
> %%K OnlyStep{number1}{material} will make "material"
> %%K appear only on step "number1"
> \def\OnlyStep#1#2{\StepBetween[#1,#1]{#2}}
> %
> %%K StepBefore{number1}{material} will make "material"
> %%K appear only on all steps before "number1"
> \def\StepBefore#1#2{
> \global\BeforeStepNumber=#1
> \StepBetween[0,\BeforeStepNumber]{#2}}
> %
> \long\def\SlideWithSteps#1#2{
> \ifSteppingSlide
> \global\StepsCounter=0
> \global\NumberOfSteps=#1
> \MakeSteps{#2}
> \else #2
> \fi}
> %
> \long\def\MakeSteps#1{\loop #1
> \ifnum\StepsCounter<\NumberOfSteps
> \global\advance\StepsCounter by 1\vfill\eject
> \repeat
> \vfill\eject}
> %
> 
> 
> %%K This is the end of the macros
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> % \endinput
> 
> %%K Here is a sample of how you can use these macros
> %%K
> \starttext
> 
> \startitemize
> 
> \SlideWithSteps{8}{
> \item Consider the following nonlinear equation:
> $$\Step{8}{{\partial u \over \partial t}} \Step{1}{-\Delta u + 
> |u|^{p-1}u} \Step{2}{=} \Step{3}{f} \Step{4}{+{\rm div}(g)} 
> \Step{5}{+|\nabla u|{\Step{6}{^2}}}$$
> \StepBetween[3,5]{\item This line appears only between steps 3 and 5}
> \Step{8}{\item The equation may be parabolic.}
> \StepBefore{4}{\item This line appears only before step 4.}
> \OnlyStep{4}{\item This line appears only at step 4.}
> \vfill (Here you see step number \the\StepsCounter)
> } % end of \SlideWithSteps
> 
> \stopitemize
> \page
> 
> \stoptext
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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