Re: MetaFun: how to check the number of arguments

[Jeong Dal <haksan@me.com>]

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Dear Hans,

Thank you for a solution.

In my memory, it is possible to check the argument in Lua, so I hope that there is a similar method in MetaFun.
It may be easier to draw grid using lines instead of squares.

Thank you again.

Best regards,

Dalyoung

> 2019. 1. 16. 오전 2:04, Hans Hagen <j.hagen@xs4all.nl> 작성:
> 
> On 1/14/2019 10:44 PM, Jeong Dal wrote:
>> Dear all,
>> In the following sample, it draws squares with label which is given.
>> I’d like to know how to check the number of elements in the second argument?
>> If it is 0, then I just draw grids only.
>> Thank you for reading.
>> Best regards,
>> Dalyoung
>> ********
>> \startbuffer[defs]
>> def drawGridF (expr nb) (text s) =
>> 	p := unitsquare scaled wu;
>> 	n:= 0;
>> 	for m = s:
>> 		i:= n mod nb;
>> 		j:= n div nb;
>> 		pic := image (draw p; label(textext(m), center p); );
>> 		draw pic shifted (i*wu, j*wu);
>> 		n:= n+ 1;
>> 	endfor;
>> enddef;
>> \stopbuffer
>> \startbuffer[3x3b]
>> wu := \MPvar{width};
>> drawGridF (3)  (1,2,3,0,1, 1,4,5,8);
>> \stopbuffer
>> \starttext
>> \setupMPvariables[width=30pt]
>> \processMPbuffer[defs,3x3b]
>> \stoptext
> 
> 
> \startbuffer[defs]
> def drawGridF (expr nb) (text s) =
>    path p ;
>    picture pic ;
>    numeric n;
> 	p := unitsquare scaled wu;
> 	n:= 0;
> 	for m = s:
> 		i:= n mod nb;
> 		j:= n div nb;
> 		pic := image (draw p; label(textext(m), center p); );
> 		draw pic shifted (i*wu, j*wu);
> 		n:= n+ 1;
> 	endfor;
>    if n == 0 :
>        draw textext("A grid!");
>    fi ;
> enddef;
> \stopbuffer
> 
> \startbuffer[3x3b]
> wu := \MPvar{width};
> drawGridF (3)  (1,2,3,0,1, 1,4,5,8);
> currentpicture := currentpicture shifted (bbwidth(currentpicture),0);
> drawGridF (3)  ();
> \stopbuffer
> 
> \setupMPvariables[width=30pt]
> \processMPbuffer[defs,3x3b]
> 
> 
> 
> 
>>> 2019. 1. 14. 오후 8:00, ntg-context-request@ntg.nl 작성:
>>> 
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>>> When replying, please edit your Subject line so it is more specific
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>>> 
>>> Today's Topics:
>>> 
>>>   1. Re: Manipulating the left blank page when chapter starts on
>>>      the right page (Wolfgang Schuster)
>>>   2. Re: Footnotes in float combinations missing in output
>>>      (Wolfgang Schuster)
>>>   3. Re: Manipulating the left blank page when chapter starts on
>>>      the right page (Jan U. Hasecke)
>>> 
>>> 
>>> ----------------------------------------------------------------------
>>> 
>>> Message: 1
>>> Date: Sun, 13 Jan 2019 16:56:40 +0100
>>> From: Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>
>>> To: mailing list for ConTeXt users <ntg-context@ntg.nl>, "Jan U.
>>> 	Hasecke" <juh+ntg-context@mailbox.org>
>>> Subject: Re: [NTG-context] Manipulating the left blank page when
>>> 	chapter starts on the right page
>>> Message-ID: <cad2dcf9-ce2c-203a-88c2-41315bd5f825@gmail.com>
>>> Content-Type: text/plain; charset=utf-8; format=flowed
>>> 
>>> Jan U. Hasecke schrieb am 12.01.19 um 22:08:
>>>> Hi Aditya,
>>>> 
>>>> Am 12.01.19 um 20:11 schrieb Aditya Mahajan:
>>>>> On Sat, 12 Jan 2019, Jan U. Hasecke wrote:
>>>>> 
>>>>>> Hi all,
>>>>>> 
>>>>>> in my document \startchapter and \starttitle starts a new chapter on the
>>>>>> right (odd) page. So sometimes, there is a blank even page just before a
>>>>>> new chapter.
>>>>>> 
>>>>>> I would like to manipulate this blank even page.
>>>>>> 
>>>>>> There are several things I would like to do, eg. having no headers and
>>>>>> footers, setting the background color to a named color, placing an image
>>>>>> or some graphics on the page.
>>>>>> 
>>>>>> Is there a way to define such a page, name it and call it in
>>>>>> \startchapter so that it is placed on the left side.
>>>>> See https://tex.stackexchange.com/q/457428/323
>>>> Thanks a lot, but I wasn't looking for a way to just delete page numbers
>>>> but to style the empty page in arbitrary ways.
>>>> 
>>>> Maybe it is better to do this manually.
>>>> 
>>>> I would let chapter open on even pages too and just insert a styled page
>>>> by hand.
>>> 
>>> Here is a example which shows how you can change the background color
>>> of a empty page before the chapter title.
>>> 
>>> \setuppagenumbering
>>>   [alternative=doublesided]
>>> 
>>> \startsetups [chapter:before]
>>>   \doifoddpageelse
>>>     {}
>>>     {\pushbackground[page]
>>>      \setupbackgrounds[page][background=color,backgroundcolor=black]
>>>      \page[empty,right]
>>>      \popbackground}
>>> \stopsetups
>>> 
>>> \setuphead
>>>   [chapter]
>>>   [page=yes,
>>>    before=\directsetup{chapter:before}]
>>> 
>>> \starttext
>>> 
>>> \startchapter[title={Knuth}]
>>> \dorecurse{10}{\samplefile{knuth}}
>>> \stopchapter
>>> 
>>> \startchapter[title={Zapf}]
>>> \dorecurse{10}{\samplefile{zapf}}
>>> \stopchapter
>>> 
>>> \startchapter[title={Ward}]
>>> \dorecurse{10}{\samplefile{ward}}
>>> \stopchapter
>>> 
>>> \stoptext
>>> 
>>> Wolfgang
>>> 
>>> 
>>> 
>>> ------------------------------
>>> 
>>> Message: 2
>>> Date: Sun, 13 Jan 2019 21:06:42 +0100
>>> From: Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>
>>> To: mailing list for ConTeXt users <ntg-context@ntg.nl>, Lars
>>> 	<axteffekt@gmail.com>
>>> Subject: Re: [NTG-context] Footnotes in float combinations missing in
>>> 	output
>>> Message-ID: <e14cd1c5-400e-14bf-d8bf-a47ef28b6550@gmail.com>
>>> Content-Type: text/plain; charset=utf-8; format=flowed
>>> 
>>> Lars schrieb am 09.01.19 um 23:01:
>>>> Hi there, hi Hans,
>>>> 
>>>> I just want to let you know that footnotes insterted in
>>>> float-combinations don't get rendered properly, i. e. only the last
>>>> footnote is placed in the output. MWE:
>>>> 
>>>> \starttext
>>>>   \startplacefigure[title={OuterCap\footnote{Outer footnote}}]
>>>> 
>>>>     \startfloatcombination[nx=3]
>>>> \placefigure{Fnote1\footnote{Hello}}{\externalfigure[cow][width={.2\textwidth}]}
>>>> \placefigure{Fnote2\footnote{small}}{\externalfigure[cow][width={.2\textwidth}]}
>>>> \placefigure{Fnote3\footnote{world}}{\externalfigure[cow][width={.2\textwidth}]}
>>>>     \stopfloatcombination
>>>> 
>>>>   \stopplacefigure
>>>> \stoptext
>>> 
>>> Not very nice but the following works. You would have less problems with
>>> local footnotes which are placed in the float block.
>>> 
>>> \starttext
>>> 
>>> \startpostponingnotes
>>>   \startplacefigure[title={...}]
>>>     ...
>>>   \stopplacefigure
>>> \stoppostponingnotes
>>> 
>>> \stoptext
>>> 
>>> Wolfgang
>>> 
>>> 
>>> ------------------------------
>>> 
>>> Message: 3
>>> Date: Mon, 14 Jan 2019 08:39:45 +0100
>>> From: "Jan U. Hasecke" <juh+ntg-context@mailbox.org>
>>> To: Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>, mailing
>>> 	list for ConTeXt users <ntg-context@ntg.nl>
>>> Subject: Re: [NTG-context] Manipulating the left blank page when
>>> 	chapter starts on the right page
>>> Message-ID: <d88401b5-1ada-6f97-ee9b-f0e8fe83cb45@mailbox.org>
>>> Content-Type: text/plain; charset=utf-8
>>> 
>>> 
>>> Am 13.01.19 um 16:56 schrieb Wolfgang Schuster:
>>> 
>>>> Here is a example which shows how you can change the background color
>>>> of a empty page before the chapter title.
>>>> 
>>>> \setuppagenumbering
>>>>   [alternative=doublesided]
>>>> 
>>>> \startsetups [chapter:before]
>>>>   \doifoddpageelse
>>>>     {}
>>>>     {\pushbackground[page]
>>>>      \setupbackgrounds[page][background=color,backgroundcolor=black]
>>>>      \page[empty,right]
>>>>      \popbackground}
>>>> \stopsetups
>>>> 
>>>> \setuphead
>>>>   [chapter]
>>>>   [page=yes,
>>>>    before=\directsetup{chapter:before}]
>>>> 
>>>> \starttext
>>>> 
>>>> \startchapter[title={Knuth}]
>>>> \dorecurse{10}{\samplefile{knuth}}
>>>> \stopchapter
>>>> 
>>>> \startchapter[title={Zapf}]
>>>> \dorecurse{10}{\samplefile{zapf}}
>>>> \stopchapter
>>>> 
>>>> \startchapter[title={Ward}]
>>>> \dorecurse{10}{\samplefile{ward}}
>>>> \stopchapter
>>>> 
>>>> \stoptext
>>> 
>>> Thanks a lot Wolfgang!
>>> 
>>> This was just the thing I was looking for. These setups seems to be the
>>> golden bullet in ConTeXt but I often have difficulties to understand the
>>> mechanism.
>>> 
>>> I'll try to wikify this later this week.
>>> 
>>> The push-pop-background pair is mentionend in x-setups-overview together
>>> with some other push-pop-pairs or push single commands. Are they
>>> documented somewhere?
>>> 
>>> juh
>>> 
>>> 
>>> 
>>> ------------------------------
>>> 
>>> Subject: Digest Footer
>>> 
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>>> ------------------------------
>>> 
>>> End of ntg-context Digest, Vol 175, Issue 27
>>> ********************************************
>> ___________________________________________________________________________________
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> 
> 
> -- 
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.nl <http://www.pragma-ade.nl/> | www.pragma-pod.nl <http://www.pragma-pod.nl/>
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___________________________________________________________________________________
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