Re: simplifying repeated macro calls in metafun

Re: simplifying repeated macro calls in metafun

[Jeong Dal]

Dear Aditya,


> A while back, I wrote some code to easily generate metapost animations. 
> 
> https://adityam.github.io/context-blog/post/metapost-animation/
> 
> I haven't used it much because I am mostly on linux, and its is a PITA to get an older version of Adobe Reader to work under wine. 

I have visited this site before, and I have used it for a few time in similar cases.
Thank you for a very nice code.

Best regards,

Dalyoung
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Re: Delivering the value of a variable in MetaFun to ConTeXt

[Jeong Dal]

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Dear Aditya and Hans,

Thank you for your suggestion.
I add 

> \startMPcalculation
>  ....
> \stopMPcalculation

and it works.

\setupinteraction[state=start]
\usemodule[animation]
\starttext
%\startanimation[menu=yes]
%{
\startMPcalculation
 path p;
\stopMPcalculation
\dorecurse{\udCount}
 {\useMPgraphic{foldUD}{num=\recurselevel}}
 {\useMPgraphic{dotLines}{num=\recurselevel}}
%}
%\stopanimation
\stoptext

However, it draws all the figures under the \startanimation case.

There may be something I missed or there is something uncertain between \dorecurse and \startanimation.

Thank you.

Best regards,

Dalyoung

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Delivering the value of a variable in MetaFun to ConTeXt

[Jeong Dal]

Hi,

Is there a way to deliver the value of a variable in MetaFun to ConTeXt.
For example, I want to do the following:

\starttext
\startMPcode
numeric maxCount;
% … some code
maxCount := 10;
\stopMPcode

dorecurse{maxCount}
{It is \recurselevel.\par}

\stoptext

Thank you for reading.

Best regards,

Dalyoung
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Re: Delivering the value of a variable in MetaFun to ConTeXt

[Hans Hagen]

On 6/23/2021 10:00 PM, Jeong Dal wrote:
> 
> Hi,
> 
> Is there a way to deliver the value of a variable in MetaFun to ConTeXt.
> For example, I want to do the following:
> 
> \starttext
> \startMPcode
> numeric maxCount;
> % … some code
> maxCount := 10;
> \stopMPcode
> 
> dorecurse{maxCount}
> {It is \recurselevel.\par}
> 
> \stoptext
> 
> Thank you for reading.
\newcount\MyCount

\starttext

\startMPcode
     numeric maxCount;
     maxCount := 10;
     setglobalmacro("MyMacro",decimal maxCount);
     setglobalcount("MyCount",maxCount);
\stopMPcode


\dorecurse{\MyMacro}{It is \recurselevel. }\par
\dorecurse{\MyCount}{It is \recurselevel. }\par

\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: Delivering the value of a variable in MetaFun to ConTeXt

[Jeong Dal]

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Dear Hans,

Your code works fine.

> \starttext
> 
> \startMPcode
>    numeric maxCount;
>    maxCount := 10;
>    setglobalmacro("MyMacro",decial maxCount);
>    setglobalcount("MyCount",maxCount);
> \stopMPcode
> 
> 
> \dorecurse{\MyMacro}{It is \recurselevel. }\par
> \dorecurse{\MyCount}{It is \recurselevel. }\par
> 
> \stoptext

I applied your method to my code as following. 

\newcount\udCount  %%% add count
\startMPinitializations%{UDBasic}
  pair A,B,C,D;
  pair E, F, G, H;
  path p,q;
  numeric ang,maxNum;

  numeric n; %AM Added

  u:=1in;
  A=(.95*TextWidth,u); B=(0,u); C=(0,0); D=(.95*TextWidth,0);
  p := A--B--C--D;
  q := (TextWidth,1.5u)--(0,1.5u)--(0,-.5u)--(TextWidth,-.5u)--cycle;
  z0=(.1u,0);
  
   vardef nextPt (expr M,N) = 
   if ypart(N) = 0: 
       H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[A,B];
   else:
       H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[C,D];
   fi;
   H
   enddef;

   def grayUD(expr i) =
      draw G -- if ypart(B)=ypart(G): B -- C else: C -- B fi --z[i];
      filldraw z[i]+2*(G-z[i])*u -- z[i] -- z[i+1] -- z[i+1]+(G-z[i])*u -- cycle withcolor .75white; 
      draw G -- z[i+1] dashed evenly;
      draw z[0] for k=0 upto i: --z[k] endfor dashed evenly;
      clip currentpicture to q;
   enddef;

   def linesUD(expr i) =
      draw p;
      draw z0 for k=0 upto i+1: --z[k] endfor dashed evenly;

      % AM: removed. Set in in the main code
      % setbounds currentpicture to boundingbox q;
   enddef;

   ang := 40;
   z[1] = whatever[z[0], z[0]+dir(ang)*u] = whatever[A,B];

   % AM: Changed next line from G to z[-1]
   z[-1] = whatever[z[0], z[0]+dir(2*ang)*u] = whatever[A,B];
   for k = 2 upto 20:
      z[k] = nextPt(z[k-2],z[k-1]);
      maxNum := k;
      exitif xpart(z[k]) > TextWidth;
   endfor;
   maxNum := maxNum-1;
   setglobalmacro("udMacro",decimal maxNum);  %%% define udMacro and udCount
   setglobalcount("udCount",maxNum);

\stopMPinitializations

\startuseMPgraphic{foldUD}{num}
   numeric n;
   n := \MPvar{num}-1;
   G := z[n-1];
   grayUD(n);
\stopuseMPgraphic
\startuseMPgraphic{dotLines}{num}
   numeric n;
   n := \MPvar{num}-1;
   linesUD(n);
\stopuseMPgraphic

\setupinteraction[state=start]
\usemodule[animation]
\starttext
%\startanimation[menu=yes]
%{
\dorecurse{\udCount}
 {\useMPgraphic{foldUD}{num=\recurselevel}}
 {\useMPgraphic{dotLines}{num=\recurselevel}}
%}
%\stopanimation
\stoptext

1. Using “udCount” doesn’t issue error message, but it draws the path p only.
2. Using “udMacro” issue the error message.

Is there anything that I miss?

Best regards,

Dalyoung

**********
tex error       > tex error on line 75 in file /Users/graph/Library/Mobile Documents/com~apple~CloudDocs/texMain/funmath/foldBandMPnew.tex: Undefined control sequence

<argument> \udMacro 
    
<macro> \dorecurse #1->\ifcase #1
    \relax \expandafter \gobbletwoarguments \or \expandafter \syst_helpers_recurse_y \else \expandafter \syst_helpers_recurse_x \fi {#1}
<line 3.75> \dorecurse{\udMacro}
    
65        numeric n;
66        n := \MPvar{num}-1;
67        linesUD(n);
68     \stopuseMPgraphic
69     
70     \setupinteraction[state=start]
71     \usemodule[animation]
72     \starttext
73     %\startanimation[menu=yes]
74     %{
75 >>  \dorecurse{\udMacro}
76      {\useMPgraphic{foldUD}{num=\recurselevel}}
77      {\useMPgraphic{dotLines}{num=\recurselevel}}
78     %}
 

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Re: Delivering the value of a variable in MetaFun to ConTeXt

[Aditya Mahajan]

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On Thu, 24 Jun 2021, Jeong Dal wrote:

> Dear Hans,
> 
> Your code works fine.
> 
> > \starttext
> > 
> > \startMPcode
> >    numeric maxCount;
> >    maxCount := 10;
> >    setglobalmacro("MyMacro",decial maxCount);
> >    setglobalcount("MyCount",maxCount);
> > \stopMPcode
> > 
> > 
> > \dorecurse{\MyMacro}{It is \recurselevel. }\par
> > \dorecurse{\MyCount}{It is \recurselevel. }\par
> > 
> > \stoptext
> 
> I applied your method to my code as following. 
> 
> \newcount\udCount  %%% add count
> \startMPinitializations%{UDBasic}
>   pair A,B,C,D;
>   pair E, F, G, H;
>   path p,q;
>   numeric ang,maxNum;
> 
>   numeric n; %AM Added
> 
>   u:=1in;
>   A=(.95*TextWidth,u); B=(0,u); C=(0,0); D=(.95*TextWidth,0);
>   p := A--B--C--D;
>   q := (TextWidth,1.5u)--(0,1.5u)--(0,-.5u)--(TextWidth,-.5u)--cycle;
>   z0=(.1u,0);
>   
>    vardef nextPt (expr M,N) = 
>    if ypart(N) = 0: 
>        H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[A,B];
>    else:
>        H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[C,D];
>    fi;
>    H
>    enddef;
> 
>    def grayUD(expr i) =
>       draw G -- if ypart(B)=ypart(G): B -- C else: C -- B fi --z[i];
>       filldraw z[i]+2*(G-z[i])*u -- z[i] -- z[i+1] -- z[i+1]+(G-z[i])*u -- cycle withcolor .75white; 
>       draw G -- z[i+1] dashed evenly;
>       draw z[0] for k=0 upto i: --z[k] endfor dashed evenly;
>       clip currentpicture to q;
>    enddef;
> 
>    def linesUD(expr i) =
>       draw p;
>       draw z0 for k=0 upto i+1: --z[k] endfor dashed evenly;
> 
>       % AM: removed. Set in in the main code
>       % setbounds currentpicture to boundingbox q;
>    enddef;
> 
>    ang := 40;
>    z[1] = whatever[z[0], z[0]+dir(ang)*u] = whatever[A,B];
> 
>    % AM: Changed next line from G to z[-1]
>    z[-1] = whatever[z[0], z[0]+dir(2*ang)*u] = whatever[A,B];
>    for k = 2 upto 20:
>       z[k] = nextPt(z[k-2],z[k-1]);
>       maxNum := k;
>       exitif xpart(z[k]) > TextWidth;
>    endfor;
>    maxNum := maxNum-1;
>    setglobalmacro("udMacro",decimal maxNum);  %%% define udMacro and udCount
>    setglobalcount("udCount",maxNum);
> 
> \stopMPinitializations
> 
> \startuseMPgraphic{foldUD}{num}
>    numeric n;
>    n := \MPvar{num}-1;
>    G := z[n-1];
>    grayUD(n);
> \stopuseMPgraphic
> \startuseMPgraphic{dotLines}{num}
>    numeric n;
>    n := \MPvar{num}-1;
>    linesUD(n);
> \stopuseMPgraphic
> 
> \setupinteraction[state=start]
> \usemodule[animation]
> \starttext
> %\startanimation[menu=yes]
> %{
> \dorecurse{\udCount}
>  {\useMPgraphic{foldUD}{num=\recurselevel}}
>  {\useMPgraphic{dotLines}{num=\recurselevel}}
> %}
> %\stopanimation
> \stoptext
> 
> 1. Using “udCount” doesn’t issue error message, but it draws the path p only.
> 2. Using “udMacro” issue the error message.
> 
> Is there anything that I miss?

You need to call the setglobalmacro(...) macro. The code inside \startMPinitializations is only executed when you call any MP environment. But you are using \udCount before \useMPgraphic. A simple solution is to run dummy MP code so that MP initializations are run:

    \starttext
    \setbox\scratchbox\hbox{\startMPcode draw unitcircle; \stopMPcode}
    \dorecurse{\udCount}
     {\useMPgraphic{foldUD}{num=\recurselevel}}
     {\useMPgraphic{dotLines}{num=\recurselevel}}
    \stoptext


Aditya

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___________________________________________________________________________________

Re: Delivering the value of a variable in MetaFun to ConTeXt

[Hans Hagen]

On 6/24/2021 5:39 AM, Aditya Mahajan wrote:

> You need to call the setglobalmacro(...) macro. The code inside \startMPinitializations is only executed when you call any MP environment. But you are using \udCount before \useMPgraphic. A simple solution is to run dummy MP code so that MP initializations are run:
> 
>      \starttext
>      \setbox\scratchbox\hbox{\startMPcode draw unitcircle; \stopMPcode}
>      \dorecurse{\udCount}
>       {\useMPgraphic{foldUD}{num=\recurselevel}}
>       {\useMPgraphic{dotLines}{num=\recurselevel}}
>      \stoptext
A run with no sideeffects in the content stream is:

\startMPcalculation
  ....
\stopMPcalculation

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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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________