\setlayer on \startalign row

\setlayer on \startalign row

[Troy Henderson]

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I would like to make a "row" of a \startalign ... \stopalign "hidden".  The
following fails.

\starttext
    \definelayer[hiddenlayer][state=stop]
    \startformula
        \startalign[n=3,align={right,middle,left}]
            \NC a \NC = \NC b \NR
            \setlayer[hiddenlayer]{\NC a + c \NC = \NC b + c \NR}
        \stopalign
    \stopformula
\stoptext

Troy Henderson

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Re: \setlayer on \startalign row

[Aditya Mahajan]

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On Wed, 6 Feb 2013, Troy Henderson wrote:

> I would like to make a "row" of a \startalign ... \stopalign "hidden".  The
> following fails.
>
> \starttext
>    \definelayer[hiddenlayer][state=stop]
>    \startformula
>        \startalign[n=3,align={right,middle,left}]
>            \NC a \NC = \NC b \NR
>            \setlayer[hiddenlayer]{\NC a + c \NC = \NC b + c \NR}
>        \stopalign
>    \stopformula
> \stoptext

Layers would not work for something like this.

I usually use the attached macros for stepping:

\environment steps
\starttext
     \StartStepping 2
     \startformula
         \startalign[n=3,align={right,middle,left}]
             \NC a \NC = \NC b \NR
             \STEP 2{\NC a + c \NC = \NC b + c \NR}
         \stopalign
       \stopformula
     \StopStepping
\stoptext

Aditya

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\startmodule steps
\unprotect

% This module defines two macros:
% \ONLY{count}{...} which displays text on a particular page
% \STEP{count}{...} which displays text from a particular page

\def\complexslides_only#1{\csname complexslides_steps_only_#1\endcsname}
\def\complexslides_step#1{\csname complexslides_steps_step_#1\endcsname}
\def\complexslides_hide#1{\csname complexslides_steps_hide_#1\endcsname}

\def\StartStep#1#2\StopStep{\complexslides_step{#1}{#2}}
\def\StartOnly#1#2\StopOnly{\complexslides_only{#1}{#2}}
\def\StartHide#1#2\StopHide{\complexslides_hide{#1}{#2}}

\long\def\gobble#1{}
\long\def\oneofone#1{#1}
\long\def\gobblebox#1%
    {\phantom{\framed[align=normal, frame=off]{#1}}}

\long\def\displaybox#1%
    {\framed[align=normal, frame=off]{#1}}

% Allow nesting of \StartStepping ... \StopStepping

\def\StartStepping#1#2\StopStepping%
  {\dorecurse{30}{\long\setvalue{complexslides_steps_step_\recurselevel}{\gobble}}%
   \dorecurse{30}{\long\setvalue{complexslides_steps_only_\recurselevel}{\gobble}}%
   \dorecurse{30}{\long\setvalue{complexslides_steps_hide_\recurselevel}{\gobblebox}}%
   \pushmacro\ONLY
   \pushmacro\STEP
   \pushmacro\HIDE
   \def\ONLY{\complexslides_only}%
   \def\STEP{\complexslides_step}%
   \def\HIDE{\complexslides_hide}%
   \dorecurse{#1}{%
   \edef\currentStepLevel{\recurselevel}%
   \long\setvalue{complexslides_steps_step_\currentStepLevel}{\oneofone}%
   \long\setvalue{complexslides_steps_only_\currentStepLevel}{\oneofone}%
   \long\setvalue{complexslides_steps_hide_\currentStepLevel}{\displaybox}%
   #2%
   \setvalue{complexslides_steps_only_\currentStepLevel}{\gobble}%
   \page\decrementnumber[userpage]}%
   \incrementnumber[userpage]%
   \popmacro\ONLY
   \popmacro\STEP
  }

\def\doifStepelse%
    {\doifelse\currentStepLevel}

% To be used in a group
\unexpanded\def\disablesteps
    {\def\complexslides_only##1{\gobble}% ##2
     \def\complexslides_step##1{\oneofone}%##2
    }

\unexpanded\def\SetStep#1#2% i of n
    {\dorecurse{#2}{\long\setvalue{complexslides_steps_step_\recurselevel}{\gobble}}%
     \dorecurse{#2}{\long\setvalue{complexslides_steps_only_\recurselevel}{\gobble}}%
     \dorecurse{#2}{\long\setvalue{complexslides_steps_hide_\recurselevel}{\gobblebox}}%
     \edef\currentStepLevel{#1}%
     \long\setvalue{complexslides_steps_step_\currentStepLevel}{\oneofone}%
     \long\setvalue{complexslides_steps_only_\currentStepLevel}{\oneofone}%
     \long\setvalue{complexslides_steps_hide_\currentStepLevel}{\displaybox}%
    }

\def\hidecomponent#1
    {\let\StartS\StartStepping
     \let\StopS\StopStepping
     \def\StartStepping{\grabbufferdata[Stepping][StartStepping][StopStepping]}
     \component[#1]
     \let\StartStepping\StartS
     \let\StopStepping\StopS}


\protect
\stopmodule

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Re: \setlayer on \startalign row

[Troy Henderson]

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Aditya,

Thanks for your steps.tex.  The following example does not work as
expected.  In particular, the first equation moves from page 1 to page 2,
and the "12 x" moves from page 2 to page 3.

Troy

    \StartStepping{10}
        \startformula
            \startalign[n=4,align={right,right,middle,left}]
                \STEP{1}{\NC \NC \frac{2}{3}x-\frac{3}{4} \NC = \NC
\frac{1}{6}x+\frac{21}{4} \NR}
                \STEP{2}{\NC 12\times\NC \NC \NC \NR}
                \STEP{3}{\NC \NC \left(12\cdot\frac{2}{3}x\right) -
\left(12\cdot\frac{3}{4}\right) \NC = \NC \left(12\cdot\frac{1}{6}x\right)
+ \left(12\cdot\frac{21}{4}\right) \NR}
                \STEP{4}{\NC \NC 8x - 9 \NC = \NC 2x + 63 \NR}
                \STEP{5}{\NC \NC 8x - 9 - 2x \NC = \NC 2x - 2x + 63 \NR}
                \STEP{6}{\NC \NC 6x - 9 \NC = \NC 63 \NR}
                \STEP{7}{\NC \NC 6x - 9 + 9 \NC = \NC 63 + 9 \NR}
                \STEP{8}{\NC \NC 6x \NC = \NC 72 \NR}
                \STEP{9}{\NC \NC \frac{6x}{6} \NC = \NC \frac{72}{6} \NR}
                \STEP{10}{\NC \NC x \NC = \NC 12}
            \stopalign
        \stopformula
    \StopStepping

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Re: \setlayer on \startalign row

[Troy Henderson]

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Aditya,

Can you confirm this phenomenon?

Troy

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Re: \setlayer on \startalign row

[Aditya Mahajan]

On Wed, 6 Feb 2013, Troy Henderson wrote:

> Aditya,
>
> Thanks for your steps.tex.  The following example does not work as
> expected.  In particular, the first equation moves from page 1 to page 2,
> and the "12 x" moves from page 2 to page 3.
>
> Troy
>
>    \StartStepping{10}
>        \startformula
>            \startalign[n=4,align={right,right,middle,left}]
>                \STEP{1}{\NC \NC \frac{2}{3}x-\frac{3}{4} \NC = \NC
> \frac{1}{6}x+\frac{21}{4} \NR}
>                \STEP{2}{\NC 12\times\NC \NC \NC \NR}
>                \STEP{3}{\NC \NC \left(12\cdot\frac{2}{3}x\right) -
> \left(12\cdot\frac{3}{4}\right) \NC = \NC \left(12\cdot\frac{1}{6}x\right)
> + \left(12\cdot\frac{21}{4}\right) \NR}
>                \STEP{4}{\NC \NC 8x - 9 \NC = \NC 2x + 63 \NR}
>                \STEP{5}{\NC \NC 8x - 9 - 2x \NC = \NC 2x - 2x + 63 \NR}
>                \STEP{6}{\NC \NC 6x - 9 \NC = \NC 63 \NR}
>                \STEP{7}{\NC \NC 6x - 9 + 9 \NC = \NC 63 + 9 \NR}
>                \STEP{8}{\NC \NC 6x \NC = \NC 72 \NR}
>                \STEP{9}{\NC \NC \frac{6x}{6} \NC = \NC \frac{72}{6} \NR}
>                \STEP{10}{\NC \NC x \NC = \NC 12}
>            \stopalign
>        \stopformula
>    \StopStepping

You need to ensure that the width of the columns does not change from each 
step. There is no easy way to do this with \startmathalign, but you can 
try \startTABLE, with explicit values of widths. (Some day, I will check 
how beamer does this with aligned equations).

Aditya
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___________________________________________________________________________________

Re: \setlayer on \startalign row

[Aditya Mahajan]

On Wed, 6 Feb 2013, Aditya Mahajan wrote:

> On Wed, 6 Feb 2013, Troy Henderson wrote:
>
>> Aditya,
>> 
>> Thanks for your steps.tex.  The following example does not work as
>> expected.  In particular, the first equation moves from page 1 to page 2,
>> and the "12 x" moves from page 2 to page 3.
>> 
>> Troy
>>
>>    \StartStepping{10}
>>        \startformula
>>            \startalign[n=4,align={right,right,middle,left}]
>>                \STEP{1}{\NC \NC \frac{2}{3}x-\frac{3}{4} \NC = \NC
>> \frac{1}{6}x+\frac{21}{4} \NR}
>>                \STEP{2}{\NC 12\times\NC \NC \NC \NR}
>>                \STEP{3}{\NC \NC \left(12\cdot\frac{2}{3}x\right) -
>> \left(12\cdot\frac{3}{4}\right) \NC = \NC \left(12\cdot\frac{1}{6}x\right)
>> + \left(12\cdot\frac{21}{4}\right) \NR}
>>                \STEP{4}{\NC \NC 8x - 9 \NC = \NC 2x + 63 \NR}
>>                \STEP{5}{\NC \NC 8x - 9 - 2x \NC = \NC 2x - 2x + 63 \NR}
>>                \STEP{6}{\NC \NC 6x - 9 \NC = \NC 63 \NR}
>>                \STEP{7}{\NC \NC 6x - 9 + 9 \NC = \NC 63 + 9 \NR}
>>                \STEP{8}{\NC \NC 6x \NC = \NC 72 \NR}
>>                \STEP{9}{\NC \NC \frac{6x}{6} \NC = \NC \frac{72}{6} \NR}
>>                \STEP{10}{\NC \NC x \NC = \NC 12}
>>            \stopalign
>>        \stopformula
>>    \StopStepping
>
> You need to ensure that the width of the columns does not change from each 
> step. There is no easy way to do this with \startmathalign, but you can try 
> \startTABLE, with explicit values of widths. (Some day, I will check how 
> beamer does this with aligned equations).

For display equations, the following will also work (but it is very tedius 
to type)

\environment steps

\long\def\gobblebox#1{\phantom{#1}}
\long\def\displaybox#1{{#1}}

\starttext
\StartStepping{3}
   \startformula
     \startalign[n=4,align={right,right,middle,left}]
       \NC \NC \frac{2}{3}x-\frac{3}{4} \NC = \NC \frac{1}{6}x+\frac{21}{4} 
\NR
       \NC \HIDE 2{12\times } \NC  \NC \NC \NR
       \NC \NC \HIDE 3 {\left(12\cdot\frac{2}{3}x\right) -
           \left(12\cdot\frac{3}{4}\right) } \NC \HIDE 3 {=} \NC
           \HIDE 3 {\left(12\cdot\frac{1}{6}x\right)
           + \left(12\cdot\frac{21}{4}\right)} \NR
     \stopalign
   \stopformula
\StopStepping
\stoptext

Aditya
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Re: \setlayer on \startalign row

[Troy Henderson]

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>
> For display equations, the following will also work (but it is very tedius
> to type)
>

Good workaround.

Troy

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Re: \setlayer on \startalign row

[Troy Henderson]

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Any idea how to put a \framed{ ... } around

\NC \NC x \NC = \NC 12

Troy

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___________________________________________________________________________________

Re: \setlayer on \startalign row

[Aditya Mahajan]

On Wed, 6 Feb 2013, Troy Henderson wrote:

> Any idea how to put a \framed{ ... } around
>
> \NC \NC x \NC = \NC 12

AFAIK, you can't. It's on my TODO list but requires a complete rewrite of 
math align macros. If you really need it:

\startsetups table:math
   \setupTABLE[frame=off, toffset=0.2ex, boffset=0.2ex]
   \setupTABLE[column][odd][align=flushright]
   \setupTABLE[column][even][align=flushleft]
   \setupTABLE[first][2][leftframe=on]
   \setupTABLE[last][2][rightframe=on]
   \setupTABLE[first,last][2][topframe=on, bottomframe=on]
\stopsetups

\starttext
   \startTABLE[setups=table:math]
     \NC $\displaystyle \frac{2}{3}x-\frac{3}{4}$ \NC $\displaymath {}= 
\frac{1}{6}x+\frac{21}{4}$ \NC \NR
     \NC $\displaystyle \left(12\cdot\frac{2}{3}x\right) - 
\left(12\cdot\frac{3}{4}\right) $
     \NC $\displaystyle{}= \left(12\cdot\frac{1}{6}x\right) + 
\left(12\cdot\frac{21}{4}\right)$ \NC \NR
   \stopTABLE
\stoptext

Aditya
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