* question for metapost experts
@ 2017-08-10 12:07 Schmitz Thomas A.
2017-08-10 12:18 ` Hans Hagen
0 siblings, 1 reply; 3+ messages in thread
From: Schmitz Thomas A. @ 2017-08-10 12:07 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi all,
this one is for all the metapos/metafun experts out there (Alan, are you there?). For a counter in one of my slide backgrounds, I have to calculate an intersectionpoint, given in percentage of the difference between current page and last page. I have always had some difficulties on the first run, when the value of the last page isn’t known yet and hence not written to the tuc file, but the error
> ! The paths don't intersect.
> <to be read again>
used to disappear in subsequent runs. Now, ConTeXt doesn’t compile the file at all and stops on this error. There is an error message I haven’t seen before:
> intersectionpoint->...The paths don't intersect");
> origin.else:0.5[point.x_.o...
> <to be read again>
> ;
> <*> ... ;z13 = (z11 -- z12) intersectionpoint qw ;
> draw z13 withcolor (0.1,0....
> This error message was generated by an `errmessage'
> command, so I can't give any explicit help.
> Pretend that you're Miss Marple: Examine all clues,
> and deduce the truth by inspired guesses.
Is there a way to make this conditional, such as (pseudocode)
if q intersects p:
z = q intersectionpoint p ;
else:
z = (0,0) ;
fi ;
I hope that this would allow ConTeXt to proceed and calculate the point correctly on the second run.
Thanks, and all best
Thomas
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* Re: question for metapost experts
2017-08-10 12:07 question for metapost experts Schmitz Thomas A.
@ 2017-08-10 12:18 ` Hans Hagen
2017-08-10 12:39 ` Schmitz Thomas A.
0 siblings, 1 reply; 3+ messages in thread
From: Hans Hagen @ 2017-08-10 12:18 UTC (permalink / raw)
To: mailing list for ConTeXt users, Schmitz Thomas A.
On 8/10/2017 2:07 PM, Schmitz Thomas A. wrote:
> Hi all,
>
> this one is for all the metapos/metafun experts out there (Alan, are you there?). For a counter in one of my slide backgrounds, I have to calculate an intersectionpoint, given in percentage of the difference between current page and last page. I have always had some difficulties on the first run, when the value of the last page isn’t known yet and hence not written to the tuc file, but the error
>
>> ! The paths don't intersect.
>> <to be read again>
>
>
> used to disappear in subsequent runs. Now, ConTeXt doesn’t compile the file at all and stops on this error. There is an error message I haven’t seen before:
>
>> intersectionpoint->...The paths don't intersect");
>> origin.else:0.5[point.x_.o...
>> <to be read again>
>> ;
>> <*> ... ;z13 = (z11 -- z12) intersectionpoint qw ;
>> draw z13 withcolor (0.1,0....
>> This error message was generated by an `errmessage'
>> command, so I can't give any explicit help.
>> Pretend that you're Miss Marple: Examine all clues,
>> and deduce the truth by inspired guesses.
>
> Is there a way to make this conditional, such as (pseudocode)
p intersection_point q
(also sets intersection_found)
> if q intersects p:
> z = q intersectionpoint p ;
> else:
> z = (0,0) ;
> fi ;
>
> I hope that this would allow ConTeXt to proceed and calculate the point correctly on the second run.
>
> Thanks, and all best
>
> Thomas
> ___________________________________________________________________________________
> 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
> ___________________________________________________________________________________
>
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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
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