Manually scaling math fences

Manually scaling math fences

[Aditya Mahajan]

Hi Hans,

There are instances where the automatic scaling provided by \left and 
\right is not ideal and one has to use manual scaling. For example:

\starttext
\startTEXpage \startformula
   \left\langle \sum_{i=1}^n A_i x_i \right\rangle
   \hbox{ vs. }
   \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
\stopformula \stopTEXpage
\stoptext

Currently, math fences always default to using \left and \right, which can 
lead to undesirable results. For example:

\definemathfence [MEAN] [angle] [command=yes, color=blue]

\starttext
\startTEXpage \startformula
   \MEAN{ \sum_{i = 1}^n A_i x_i }
   \hbox{ vs. }
   \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
\stopformula \stopTEXpage
\stoptext

Could we add an option to \definefence that allows the user to select the 
delimiter scaling using a key (say, `delimiter`) so that

\MEAN[delimiter=auto] expands to \left\langle .. \right\langle
\MEAN[delimiter=]     expands to \langle .. \rangle
\MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
\MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
\MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
\MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle

I am not sure whether `delimiter` is the best key. I think that `scale` 
may be better, but using `scale` for specifying the scaling of math 
delimiters will be inconsistent with how `scale` is used everywhere else. 
Another option is to use `alternative` key.

Thanks,
Aditya
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Re: Manually scaling math fences

[Otared Kavian]

Hi Aditya,

I agree totally with you and support your suggestion…
Maybe instead of the « delimiter » keyword, one could introduce a keyword such as « size »:


\MEAN[size=auto] expands to \left\langle .. \right\langle
\MEAN[size=]     expands to \langle .. \rangle
\MEAN[size=big]  expands to \big\langle  ... \big\rangle
\MEAN[size=Big]  expands to \Big\langle  ... \Big\rangle
\MEAN[size=bigg] expands to \bigg\langle ... \bigg\rangle
\MEAN[size=Bigg] expands to \Bigg\langle ... \Bigg\rangle

Best regards: OK

> On 6 Mar 2017, at 20:57, Aditya Mahajan <adityam@umich.edu> wrote:
> 
> Hi Hans,
> 
> There are instances where the automatic scaling provided by \left and \right is not ideal and one has to use manual scaling. For example:
> 
> \starttext
> \startTEXpage \startformula
>  \left\langle \sum_{i=1}^n A_i x_i \right\rangle
>  \hbox{ vs. }
>  \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
> \stopformula \stopTEXpage
> \stoptext
> 
> Currently, math fences always default to using \left and \right, which can lead to undesirable results. For example:
> 
> \definemathfence [MEAN] [angle] [command=yes, color=blue]
> 
> \starttext
> \startTEXpage \startformula
>  \MEAN{ \sum_{i = 1}^n A_i x_i }
>  \hbox{ vs. }
>  \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
> \stopformula \stopTEXpage
> \stoptext
> 
> Could we add an option to \definefence that allows the user to select the delimiter scaling using a key (say, `delimiter`) so that
> 
> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
> \MEAN[delimiter=]     expands to \langle .. \rangle
> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
> 
> I am not sure whether `delimiter` is the best key. I think that `scale` may be better, but using `scale` for specifying the scaling of math delimiters will be inconsistent with how `scale` is used everywhere else. Another option is to use `alternative` key.
> 
> Thanks,
> 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
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> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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Re: Manually scaling math fences

[Hans Hagen]

On 3/7/2017 7:35 AM, Otared Kavian wrote:
> Hi Aditya,
>
> I agree totally with you and support your suggestion…
> Maybe instead of the « delimiter » keyword, one could introduce a keyword such as « size »:
>
>
> \MEAN[size=auto] expands to \left\langle .. \right\langle
> \MEAN[size=]     expands to \langle .. \rangle
> \MEAN[size=big]  expands to \big\langle  ... \big\rangle
> \MEAN[size=Big]  expands to \Big\langle  ... \Big\rangle
> \MEAN[size=bigg] expands to \bigg\langle ... \bigg\rangle
> \MEAN[size=Bigg] expands to \Bigg\langle ... \Bigg\rangle

with integrals we have factor as key ... anyway, i'll look into it (not 
in the middle of something else) .. luatex actually has a bitmore 
control over these matters built in

> Best regards: OK
>
>> On 6 Mar 2017, at 20:57, Aditya Mahajan <adityam@umich.edu> wrote:
>>
>> Hi Hans,
>>
>> There are instances where the automatic scaling provided by \left and \right is not ideal and one has to use manual scaling. For example:
>>
>> \starttext
>> \startTEXpage \startformula
>>  \left\langle \sum_{i=1}^n A_i x_i \right\rangle
>>  \hbox{ vs. }
>>  \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
>> \stopformula \stopTEXpage
>> \stoptext
>>
>> Currently, math fences always default to using \left and \right, which can lead to undesirable results. For example:
>>
>> \definemathfence [MEAN] [angle] [command=yes, color=blue]
>>
>> \starttext
>> \startTEXpage \startformula
>>  \MEAN{ \sum_{i = 1}^n A_i x_i }
>>  \hbox{ vs. }
>>  \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
>> \stopformula \stopTEXpage
>> \stoptext
>>
>> Could we add an option to \definefence that allows the user to select the delimiter scaling using a key (say, `delimiter`) so that
>>
>> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
>> \MEAN[delimiter=]     expands to \langle .. \rangle
>> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
>> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
>> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
>> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
>>
>> I am not sure whether `delimiter` is the best key. I think that `scale` may be better, but using `scale` for specifying the scaling of math delimiters will be inconsistent with how `scale` is used everywhere else. Another option is to use `alternative` key.

it would be something factor=2 or so, not the funny XxXxxxXX kind of flags


>> Thanks,
>> 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://context.aanhet.net
>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>
> ___________________________________________________________________________________
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Manually scaling math fences

[Aditya Mahajan]

On Tue, 7 Mar 2017, Hans Hagen wrote:

>>> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
>>> \MEAN[delimiter=]     expands to \langle .. \rangle
>>> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
>>> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
>>> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
>>> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
>>>
>>> I am not sure whether `delimiter` is the best key. I think that `scale` 
> may be better, but using `scale` for specifying the scaling of math 
> delimiters will be inconsistent with how `scale` is used everywhere else. 
> Another option is to use `alternative` key.
>
> it would be something factor=2 or so, not the funny XxXxxxXX kind of flags

Sure. factor=(auto|none|1|2|3|4) is also ok (and would be directly mapped 
to choosemathbig).

Aditya
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Re: Manually scaling math fences

[Hans Hagen]

On 3/8/2017 2:45 AM, Aditya Mahajan wrote:
> On Tue, 7 Mar 2017, Hans Hagen wrote:
>
>>>> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
>>>> \MEAN[delimiter=]     expands to \langle .. \rangle
>>>> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
>>>> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
>>>> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
>>>> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
>>>>
>>>> I am not sure whether `delimiter` is the best key. I think that `scale`
>> may be better, but using `scale` for specifying the scaling of math
>> delimiters will be inconsistent with how `scale` is used everywhere
>> else. Another option is to use `alternative` key.
>>
>> it would be something factor=2 or so, not the funny XxXxxxXX kind of
>> flags
>
> Sure. factor=(auto|none|1|2|3|4) is also ok (and would be directly
> mapped to choosemathbig).

actually we will hook into a new feature of luatex for specifying the 
size of delimiters (so no vbox hack) .. factors are multipliers of 
bodyfontsize

\definemathfence [MEAN] [angle] [command=yes, color=blue, factor=2.5]

\starttext
\startTEXpage \startformula
     \MEAN[factor=1]{\sum_{i = 1}^n A_i x_i }
     \hbox{ vs. }
     \MEAN{ \sum_{i = 1}^n A_i x_i }
     \hbox{ vs. }
     \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
\stopformula \stopTEXpage
\stoptext



-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Manually scaling math fences

[Aditya Mahajan]

On Thu, 23 Mar 2017, Hans Hagen wrote:

> On 3/8/2017 2:45 AM, Aditya Mahajan wrote:
>> On Tue, 7 Mar 2017, Hans Hagen wrote:
>>
>>>>> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
>>>>> \MEAN[delimiter=]     expands to \langle .. \rangle
>>>>> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
>>>>> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
>>>>> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
>>>>> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
>>>>>
>>>>> I am not sure whether `delimiter` is the best key. I think that 
> `scale`
>>> may be better, but using `scale` for specifying the scaling of math
>>> delimiters will be inconsistent with how `scale` is used everywhere
>>> else. Another option is to use `alternative` key.
>>>
>>> it would be something factor=2 or so, not the funny XxXxxxXX kind of
>>> flags
>>
>> Sure. factor=(auto|none|1|2|3|4) is also ok (and would be directly
>> mapped to choosemathbig).
>
> actually we will hook into a new feature of luatex for specifying the 
> size of delimiters (so no vbox hack) .. factors are multipliers of 
> bodyfontsize
>
> \definemathfence [MEAN] [angle] [command=yes, color=blue, factor=2.5]
>
> \starttext
> \startTEXpage \startformula
>     \MEAN[factor=1]{\sum_{i = 1}^n A_i x_i }
>     \hbox{ vs. }
>     \MEAN{ \sum_{i = 1}^n A_i x_i }
>     \hbox{ vs. }
>     \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
> \stopformula \stopTEXpage
> \stoptext

Thanks.

If I understand the code correctly (sorry, haven't tested it yet),

factor=, factor=none, and factor=auto all behave the same (all insert 
\normalleft ... \normalright)

I think that it may be more consistent if factor= and factor=none do not 
scale the delimited at all. To maintain backward compatibility, the 
default value of factor can be set to auto.

Also what values of factor give scaling equal to \big, \Big, \bigg, and 
\Bigg?

Aditya
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Re: Manually scaling math fences

[Hans Hagen]

On 3/24/2017 8:24 AM, Aditya Mahajan wrote:
> On Thu, 23 Mar 2017, Hans Hagen wrote:
>
>> On 3/8/2017 2:45 AM, Aditya Mahajan wrote:
>>> On Tue, 7 Mar 2017, Hans Hagen wrote:
>>>
>>>>>> \MEAN[delimiter=auto] expands to \left\langle .. \right\langle
>>>>>> \MEAN[delimiter=]     expands to \langle .. \rangle
>>>>>> \MEAN[delimiter=big]  expands to \big\langle  ... \big\rangle
>>>>>> \MEAN[delimiter=Big]  expands to \Big\langle  ... \Big\rangle
>>>>>> \MEAN[delimiter=bigg] expands to \bigg\langle ... \bigg\rangle
>>>>>> \MEAN[delimiter=Bigg] expands to \Bigg\langle ... \Bigg\rangle
>>>>>>
>>>>>> I am not sure whether `delimiter` is the best key. I think that
>> `scale`
>>>> may be better, but using `scale` for specifying the scaling of math
>>>> delimiters will be inconsistent with how `scale` is used everywhere
>>>> else. Another option is to use `alternative` key.
>>>>
>>>> it would be something factor=2 or so, not the funny XxXxxxXX kind of
>>>> flags
>>>
>>> Sure. factor=(auto|none|1|2|3|4) is also ok (and would be directly
>>> mapped to choosemathbig).
>>
>> actually we will hook into a new feature of luatex for specifying the
>> size of delimiters (so no vbox hack) .. factors are multipliers of
>> bodyfontsize
>>
>> \definemathfence [MEAN] [angle] [command=yes, color=blue, factor=2.5]
>>
>> \starttext
>> \startTEXpage \startformula
>>     \MEAN[factor=1]{\sum_{i = 1}^n A_i x_i }
>>     \hbox{ vs. }
>>     \MEAN{ \sum_{i = 1}^n A_i x_i }
>>     \hbox{ vs. }
>>     \bigg\langle \sum_{i=1}^n A_i x_i \bigg\rangle
>> \stopformula \stopTEXpage
>> \stoptext
>
> Thanks.
>
> If I understand the code correctly (sorry, haven't tested it yet),
>
> factor=, factor=none, and factor=auto all behave the same (all insert
> \normalleft ... \normalright)

i prefer empty to be as before we even had factor i.e. same as auto

      \ifx\p_factor\empty
        #2%
      \else\ifx\p_factor\v!auto
        #2%
      \else\ifx\p_factor\v!none
        #3\s!height\zeropoint\s!depth\zeropoint\s!axis
        #2%
      \else
        \scratchdimen\dimexpr\p_factor\bodyfontsize/2\relax
        #3\s!height\scratchdimen\s!depth\scratchdimen\s!axis
      \fi\fi\fi

> I think that it may be more consistent if factor= and factor=none do not
> scale the delimited at all. To maintain backward compatibility, the
> default value of factor can be set to auto.
>
> Also what values of factor give scaling equal to \big, \Big, \bigg, and
> \Bigg?

These values are actually somewhat weird and relate to the design size 
of a font .. derived from plain:

0.85
1.15
1.45
1.75

but ... as these are extensibles a font might have more values. The 
factor is n times the bodyfontsize (50% above and below the axis)

what actually comes out depends on the chosen font

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Manually scaling math fences

[Otared Kavian]

> On 24 Mar 2017, at 08:24, Aditya Mahajan <adityam@umich.edu> wrote:
>> […]
> 
> Thanks.
> 
> If I understand the code correctly (sorry, haven't tested it yet),

Hi Aditya and Hans,

Thank you Hans for the new feature.
I did test the code sent by Hans, but it seems that the feature is not yet in the latest ConTeXt 2017.03.23 17:20 MKIV beta.

Best regards: OK
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Re: Manually scaling math fences

[Otared Kavian]

Sorry for the noise… it does work fine indeed with ConTeXt 2017.03.23 17:20 MKIV beta (I tried last night with a previous version…).

Thank you so much Hans!

> On 24 Mar 2017, at 10:56, Otared Kavian <otared@gmail.com> wrote:
> 
> 
>> On 24 Mar 2017, at 08:24, Aditya Mahajan <adityam@umich.edu> wrote:
>>> […]
>> 
>> Thanks.
>> 
>> If I understand the code correctly (sorry, haven't tested it yet),
> 
> Hi Aditya and Hans,
> 
> Thank you Hans for the new feature.
> I did test the code sent by Hans, but it seems that the feature is not yet in the latest ConTeXt 2017.03.23 17:20 MKIV beta.
> 
> Best regards: OK

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