* Code Called Twice?
@ 2013-10-11 6:21 Thangalin
2013-10-11 7:27 ` Marco Patzer
2013-10-11 11:00 ` Philipp Gesang
0 siblings, 2 replies; 7+ messages in thread
From: Thangalin @ 2013-10-11 6:21 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
I noticed something unexpected with the following code:
\enabletrackers[metapost.showlog]
\startuseMPgraphic{heading:ThemeTitleStyle}
show "HEADING:THEMETITLESTYLE";
show \MPstring{heading:title};
draw textext( \MPstring{heading:title} ) rotated 5
withcolor blue;
\stopuseMPgraphic
\defineframed[ThemeTitleStyle][
background=\useMPgraphic{ThemeTitleStyle},
]
\def\processword#1{%
\setMPtext{heading:title}{#1}%
\useMPgraphic{heading:ThemeTitleStyle}
}
\define[1]\ThemeChapterTitle{\applytosplitstringword\processword{#1}}
\setuphead[chapter][deeptextcommand={\ThemeChapterTitle}]
\starttext
\startchapter[title=Why Is heading:ThemeTitleStyle Called Twice?]
\input knuth
\stopchapter
\stoptext
It appears as though heading:ThemeTitleStyle is being called twice:
metapost > info:
>> "HEADING:THEMETITLESTYLE"
>> "Why"
metapost > info:
>> "HEADING:THEMETITLESTYLE"
>> "Why"
I am trying to produce a random number that is not equal to the
previous random number. However, if the code is called twice, then I'd
have to add code to ignore one of the calls.
Any ideas why the code seems to be called twice and what can be done
to ensure that it is only called once?
Thank you!
___________________________________________________________________________________
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* Re: Code Called Twice?
2013-10-11 6:21 Code Called Twice? Thangalin
@ 2013-10-11 7:27 ` Marco Patzer
2013-10-11 16:39 ` Thangalin
2013-10-11 11:00 ` Philipp Gesang
1 sibling, 1 reply; 7+ messages in thread
From: Marco Patzer @ 2013-10-11 7:27 UTC (permalink / raw)
To: ntg-context
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On 2013–10–10 Thangalin wrote:
> I noticed something unexpected with the following code:
>
> \enabletrackers[metapost.showlog]
>
> \startuseMPgraphic{heading:ThemeTitleStyle}
> show "HEADING:THEMETITLESTYLE";
> show \MPstring{heading:title};
>
> draw textext( \MPstring{heading:title} ) rotated 5
> withcolor blue;
> \stopuseMPgraphic
>
> […]
>
> It appears as though heading:ThemeTitleStyle is being called twice:
If I'm not mistaken that's the way MP works when text is involved,
it's a two-pass approach. In graphics without text MP has all
information it needs to create the image. The text in MP graphics is
typeset using TeX. After it's typeset MP picks it up in a second
run.
> I am trying to produce a random number that is not equal to the
> previous random number. However, if the code is called twice, then I'd
> have to add code to ignore one of the calls.
Maintain a vector with the last two elements to check against.
Marco
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___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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* Re: Code Called Twice?
2013-10-11 6:21 Code Called Twice? Thangalin
2013-10-11 7:27 ` Marco Patzer
@ 2013-10-11 11:00 ` Philipp Gesang
2013-10-11 21:29 ` Hans Hagen
1 sibling, 1 reply; 7+ messages in thread
From: Philipp Gesang @ 2013-10-11 11:00 UTC (permalink / raw)
To: mailing list for ConTeXt users
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···<date: 2013-10-10, Thursday>···<from: Thangalin>···
>
> I noticed something unexpected with the following code:
>
> \enabletrackers[metapost.showlog]
>
> \startuseMPgraphic{heading:ThemeTitleStyle}
> show "HEADING:THEMETITLESTYLE";
> show \MPstring{heading:title};
>
> draw textext( \MPstring{heading:title} ) rotated 5
> withcolor blue;
> \stopuseMPgraphic
>
> \defineframed[ThemeTitleStyle][
> background=\useMPgraphic{ThemeTitleStyle},
> ]
>
> \def\processword#1{%
> \setMPtext{heading:title}{#1}%
> \useMPgraphic{heading:ThemeTitleStyle}
> }
>
> \define[1]\ThemeChapterTitle{\applytosplitstringword\processword{#1}}
> \setuphead[chapter][deeptextcommand={\ThemeChapterTitle}]
>
> \starttext
> \startchapter[title=Why Is heading:ThemeTitleStyle Called Twice?]
> \input knuth
> \stopchapter
> \stoptext
>
> It appears as though heading:ThemeTitleStyle is being called twice:
>
> metapost > info:
> >> "HEADING:THEMETITLESTYLE"
> >> "Why"
> metapost > info:
> >> "HEADING:THEMETITLESTYLE"
> >> "Why"
>
> I am trying to produce a random number that is not equal to the
> previous random number. However, if the code is called twice, then I'd
> have to add code to ignore one of the calls.
>
> Any ideas why the code seems to be called twice and what can be done
> to ensure that it is only called once?
Don’t use text ;-) That’s a known issue: as soon as your Metapost
code contains text, it will be processed twice. E.g.:
\starttext
\setMPtext{heading:title}{foo}
\startMPcode
show "This gets printed twice.";
draw textext( \MPstring{heading:title} );
\stopMPcode
\stoptext
Same for labels, {b,e}tex. See also this thread:
http://www.ntg.nl/pipermail/ntg-context/2011/056047.html
Best regards,
Philipp
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___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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* Re: Code Called Twice?
2013-10-11 7:27 ` Marco Patzer
@ 2013-10-11 16:39 ` Thangalin
0 siblings, 0 replies; 7+ messages in thread
From: Thangalin @ 2013-10-11 16:39 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
> typeset using TeX. After it's typeset MP picks it up in a second
> run.
That also explains why the spacing between words is correct (I didn't
think MP could typeset text).
> Maintain a vector with the last two elements to check against.
An interesting approach; I used a Boolean flag as per this thread:
http://www.ntg.nl/pipermail/ntg-context/2011/056078.html
Works as expected.
Thank you for the all help!
___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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* Re: Code Called Twice?
2013-10-11 11:00 ` Philipp Gesang
@ 2013-10-11 21:29 ` Hans Hagen
2013-10-12 0:09 ` Philipp Gesang
0 siblings, 1 reply; 7+ messages in thread
From: Hans Hagen @ 2013-10-11 21:29 UTC (permalink / raw)
To: ntg-context
On 10/11/2013 1:00 PM, Philipp Gesang wrote:
> ···<date: 2013-10-10, Thursday>···<from: Thangalin>···
>
>>
>> I noticed something unexpected with the following code:
>>
>> \enabletrackers[metapost.showlog]
>>
>> \startuseMPgraphic{heading:ThemeTitleStyle}
>> show "HEADING:THEMETITLESTYLE";
>> show \MPstring{heading:title};
>>
>> draw textext( \MPstring{heading:title} ) rotated 5
>> withcolor blue;
>> \stopuseMPgraphic
>>
>> \defineframed[ThemeTitleStyle][
>> background=\useMPgraphic{ThemeTitleStyle},
>> ]
>>
>> \def\processword#1{%
>> \setMPtext{heading:title}{#1}%
>> \useMPgraphic{heading:ThemeTitleStyle}
>> }
>>
>> \define[1]\ThemeChapterTitle{\applytosplitstringword\processword{#1}}
>> \setuphead[chapter][deeptextcommand={\ThemeChapterTitle}]
>>
>> \starttext
>> \startchapter[title=Why Is heading:ThemeTitleStyle Called Twice?]
>> \input knuth
>> \stopchapter
>> \stoptext
>>
>> It appears as though heading:ThemeTitleStyle is being called twice:
>>
>> metapost > info:
>>>> "HEADING:THEMETITLESTYLE"
>>>> "Why"
>> metapost > info:
>>>> "HEADING:THEMETITLESTYLE"
>>>> "Why"
>>
>> I am trying to produce a random number that is not equal to the
>> previous random number. However, if the code is called twice, then I'd
>> have to add code to ignore one of the calls.
>>
>> Any ideas why the code seems to be called twice and what can be done
>> to ensure that it is only called once?
>
> Don’t use text ;-) That’s a known issue: as soon as your Metapost
> code contains text, it will be processed twice. E.g.:
>
>
> \starttext
> \setMPtext{heading:title}{foo}
> \startMPcode
> show "This gets printed twice.";
> draw textext( \MPstring{heading:title} );
> \stopMPcode
> \stoptext
>
> Same for labels, {b,e}tex. See also this thread:
>
> http://www.ntg.nl/pipermail/ntg-context/2011/056047.html
you can check for it:
\enabletrackers[metapost.showlog]
and in the mp code:
message(if mfun_first_run : "first run" else : "final run" fi) ;
message(if mfun_trial_run : "trial run" else : "final run" fi) ;
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Code Called Twice?
2013-10-11 21:29 ` Hans Hagen
@ 2013-10-12 0:09 ` Philipp Gesang
2013-10-12 0:16 ` Hans Hagen
0 siblings, 1 reply; 7+ messages in thread
From: Philipp Gesang @ 2013-10-12 0:09 UTC (permalink / raw)
To: mailing list for ConTeXt users
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···<date: 2013-10-11, Friday>···<from: Hans Hagen>···
> On 10/11/2013 1:00 PM, Philipp Gesang wrote:
> > ···<date: 2013-10-10, Thursday>···<from: Thangalin>···
> >
> >>
> >> I noticed something unexpected with the following code:
> >>
> >> \enabletrackers[metapost.showlog]
> >>
> >> \startuseMPgraphic{heading:ThemeTitleStyle}
> >> show "HEADING:THEMETITLESTYLE";
> >> show \MPstring{heading:title};
> >>
> >> draw textext( \MPstring{heading:title} ) rotated 5
> >> withcolor blue;
> >> \stopuseMPgraphic
> >>
> >> \defineframed[ThemeTitleStyle][
> >> background=\useMPgraphic{ThemeTitleStyle},
> >> ]
> >>
> >> \def\processword#1{%
> >> \setMPtext{heading:title}{#1}%
> >> \useMPgraphic{heading:ThemeTitleStyle}
> >> }
> >>
> >> \define[1]\ThemeChapterTitle{\applytosplitstringword\processword{#1}}
> >> \setuphead[chapter][deeptextcommand={\ThemeChapterTitle}]
> >>
> >> \starttext
> >> \startchapter[title=Why Is heading:ThemeTitleStyle Called Twice?]
> >> \input knuth
> >> \stopchapter
> >> \stoptext
> >>
> >> It appears as though heading:ThemeTitleStyle is being called twice:
> >>
> >> metapost > info:
> >>>> "HEADING:THEMETITLESTYLE"
> >>>> "Why"
> >> metapost > info:
> >>>> "HEADING:THEMETITLESTYLE"
> >>>> "Why"
> >>
> >> I am trying to produce a random number that is not equal to the
> >> previous random number. However, if the code is called twice, then I'd
> >> have to add code to ignore one of the calls.
> >>
> >> Any ideas why the code seems to be called twice and what can be done
> >> to ensure that it is only called once?
> >
> > Don’t use text ;-) That’s a known issue: as soon as your Metapost
> > code contains text, it will be processed twice. E.g.:
> >
> >
> > \starttext
> > \setMPtext{heading:title}{foo}
> > \startMPcode
> > show "This gets printed twice.";
> > draw textext( \MPstring{heading:title} );
> > \stopMPcode
> > \stoptext
> >
> > Same for labels, {b,e}tex. See also this thread:
> >
> > http://www.ntg.nl/pipermail/ntg-context/2011/056047.html
>
> you can check for it:
>
> \enabletrackers[metapost.showlog]
>
> and in the mp code:
>
> message(if mfun_first_run : "first run" else : "final run" fi) ;
> message(if mfun_trial_run : "trial run" else : "final run" fi) ;
>
> Hans
That’s handy! I added a section on dealing with multi-pass to the
“gotchas” page:
http://wiki.contextgarden.net/Unexpected_behavior#Multipass
There is a subsection about MP at the end.
Btw. the behavior of mfun_trial_run is not very intuitive. I’d
expect it to work like \iftrialtypesetting, but in a single-pass
context it evaluates to true:
\enabletrackers[metapost.showlog]
\starttext
\startMPcode
if mfun_trial_run :
show "This should be printed during the trial pass.";
else :
show "This should be printed during the final pass.";
fi;
fill unitcircle scaled 1cm withcolor blue;
%label (btex Some label text etex, (0,0));
\stopMPcode
\stoptext
Uncommenting the label yields two passes, as expected.
Best regards,
Philipp
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___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Code Called Twice?
2013-10-12 0:09 ` Philipp Gesang
@ 2013-10-12 0:16 ` Hans Hagen
0 siblings, 0 replies; 7+ messages in thread
From: Hans Hagen @ 2013-10-12 0:16 UTC (permalink / raw)
To: ntg-context
On 10/12/2013 2:09 AM, Philipp Gesang wrote:
> Btw. the behavior of mfun_trial_run is not very intuitive. I’d
> expect it to work like \iftrialtypesetting, but in a single-pass
> context it evaluates to true:
keep in mind that one really needs to process the text in order to get
the dimensions right ... so trialtypesetting is something else
so, the trial run flag has to be used with care
also, texts are cached, so if you typeset for instance labels, 500 times
a '1' or '2' will only be typeset once (over the years lots of small
optimizations took place)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2013-10-11 6:21 Code Called Twice? Thangalin
2013-10-11 7:27 ` Marco Patzer
2013-10-11 16:39 ` Thangalin
2013-10-11 11:00 ` Philipp Gesang
2013-10-11 21:29 ` Hans Hagen
2013-10-12 0:09 ` Philipp Gesang
2013-10-12 0:16 ` Hans Hagen
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