* lmt_followtext crashes while standard followtext itself works
@ 2020-05-03 21:47 Gerben Wierda
2020-05-04 8:30 ` Hans Hagen
0 siblings, 1 reply; 3+ messages in thread
From: Gerben Wierda @ 2020-05-03 21:47 UTC (permalink / raw)
To: mailing list for ConTeXt users
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The following example has been extracted from my automatically generated MP code.
\starttext
\startMPpage
string texstring;
texstring := "{\colored [r=0.00, g=0.00, b=0.00]{\definebodyfont [9.0pt][rm][default=Regular at 9.0pt]\switchtobodyfont [9.0pt]\setupinterlinespace [9.9pt]\tf E.g. publish/ subscribe}}";
path parpath;
parpath :=
(238,-167.00010681152344)..controls (238,-167.00010681152344) and (238,-167.00010681152344)
..(238,-167.00010681152344)..controls (238,-166.60010673470143) and (238,-166.20010665787942)
..(238,-165.80010658105741)..controls (238,-165.40010643392299) and (238,-165.00010628678857)
..(238,-164.60010613965414)..controls (238,-164.2001060472048) and (238,-163.80010595475545)
..(238,-163.40010586230611)..controls (238,-155.56353466513065) and (231.9683162849897,-149)
..(224.2552179837387,-149)..controls (223.85521783436539,-149) and (223.45521768499208,-149)
..(223.05521753561877,-149)..controls (222.65521740514737,-149) and (222.255217274676,-149)
..(221.8552171442046,-149)..controls (221.45521705001735,-149) and (221.0552169558301,-149)
..(220.65521686164286,-149)..controls (220.25521665589685,-149) and (219.85521645015083,-149)
..(219.45521624440482,-149)..controls (219.05521631807508,-149) and (218.65521639174534,-149)
..(218.2552164654156,-149)..controls (217.85521724037432,-149) and (217.45521801533303,-149)
..(217.05521879029175,-149)..controls (216.6552203077878,-149) and (216.25522182528385,-149)
..(215.85522334277991,-149)..controls (215.45522405083273,-149) and (215.05522475888554,-149)
..(214.65522546693836,-149)..controls (214.25522550518758,-149) and (213.8552255434368,-149)
..(213.45522558168602,-149)..controls (213.0552253720042,-149) and (212.65522516232238,-149)
..(212.25522495264056,-149)..controls (211.8552248680295,-149) and (211.45522478341843,-149)
..(211.05522469880736,-149)..controls (210.65522456100436,-149) and (210.25522442320135,-149)
..(209.85522428539835,-149)..controls (209.45522414149036,-149) and (209.05522399758237,-149)
..(208.65522385367439,-149)..controls (200.95716230583835,-149) and (195,-155.63452868682958)
..(195,-163.48966401016395)..controls (195,-163.88966411101083) and (195,-164.28966421185771)
..(195,-164.68966431270459)..controls (195,-165.08966445890775) and (195,-165.4896646051109)
..(195,-165.88966475131406)..controls (195,-166.25981210471718) and (195,-166.62995945812031)
..(195,-167.00010681152344);
picture pic;
pic := lmt_followtext [
text = texstring,
path = parpath,
spread = false,
];
\stopMPpage
\stoptext
lmt_followtext crashes on this code with:
metapost log > ! angle(0,0) is taken as zero.
metapost log > <for(1)> ...0)]shifted(-wid/2,0)rotated(angle(ad))
metapost log > shifted.ap;draw.pic[(EXPR0...
metapost log > <argument> ...caled0.5pt.withcolor.green;fi;endfor
metapost log > ;if((autoscaleupfollowtext...
metapost log >
metapost log > image->...ture;currentpicture:=nullpicture;(TEXT3)
metapost log > ;currentpicture.if.str(SUF...
metapost log >
metapost log > followtext->...b_n;setbounds.currentpicture.to.b;)
metapost log > endgroup
metapost log > <argument> ...parameter"path"),getparameter"text")
metapost log > ;popparameters;
metapost log > image->...ture;currentpicture:=nullpicture;(TEXT3)
metapost log > ;currentpicture.if.str(SUF...
metapost log >
metapost log > lmt_do_followtext->...meter"text");popparameters;)
metapost log > endgroup
metapost log > <scantokens> lmt_do_followtext
metapost log >
metapost log > <*> ...exstring, path = parpath, spread = false, ]
metapost log > ; ;
When I adapt the parameters that create parpath in my code, other uses of lmt_followtext crash. The same combinations of text and path so far haven’t crashed basic followtext().
I’ve run into comparable situations in my own code where I had to add code to handle the existence of a (0,0) direction (e.g. when I had two identical points on a path, but that is not the case here). The above minimal example triggers the failure.
G
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: lmt_followtext crashes while standard followtext itself works
2020-05-03 21:47 lmt_followtext crashes while standard followtext itself works Gerben Wierda
@ 2020-05-04 8:30 ` Hans Hagen
2020-05-04 9:20 ` Gerben Wierda
0 siblings, 1 reply; 3+ messages in thread
From: Hans Hagen @ 2020-05-04 8:30 UTC (permalink / raw)
To: mailing list for ConTeXt users, Gerben Wierda
On 5/3/2020 11:47 PM, Gerben Wierda wrote:
> The following example has been extracted from my automatically generated
> MP code.
>
> \starttext
>
> \startMPpage
>
> string texstring;
> texstring := "{\colored [r=0.00, g=0.00, b=0.00]{\definebodyfont
> [9.0pt][rm][default=Regular at 9.0pt]\switchtobodyfont
> [9.0pt]\setupinterlinespace [9.9pt]\tf E.g. publish/ subscribe}}";
> path parpath;
> parpath :=
> (238,-167.00010681152344)..controls (238,-167.00010681152344) and
> (238,-167.00010681152344)
> ..(238,-167.00010681152344)..controls (238,-166.60010673470143) and
> (238,-166.20010665787942)
> ..(238,-165.80010658105741)..controls (238,-165.40010643392299) and
> (238,-165.00010628678857)
> ..(238,-164.60010613965414)..controls (238,-164.2001060472048) and
> (238,-163.80010595475545)
> ..(238,-163.40010586230611)..controls (238,-155.56353466513065) and
> (231.9683162849897,-149)
> ..(224.2552179837387,-149)..controls (223.85521783436539,-149) and
> (223.45521768499208,-149)
> ..(223.05521753561877,-149)..controls (222.65521740514737,-149) and
> (222.255217274676,-149)
> ..(221.8552171442046,-149)..controls (221.45521705001735,-149) and
> (221.0552169558301,-149)
> ..(220.65521686164286,-149)..controls (220.25521665589685,-149) and
> (219.85521645015083,-149)
> ..(219.45521624440482,-149)..controls (219.05521631807508,-149) and
> (218.65521639174534,-149)
> ..(218.2552164654156,-149)..controls (217.85521724037432,-149) and
> (217.45521801533303,-149)
> ..(217.05521879029175,-149)..controls (216.6552203077878,-149) and
> (216.25522182528385,-149)
> ..(215.85522334277991,-149)..controls (215.45522405083273,-149) and
> (215.05522475888554,-149)
> ..(214.65522546693836,-149)..controls (214.25522550518758,-149) and
> (213.8552255434368,-149)
> ..(213.45522558168602,-149)..controls (213.0552253720042,-149) and
> (212.65522516232238,-149)
> ..(212.25522495264056,-149)..controls (211.8552248680295,-149) and
> (211.45522478341843,-149)
> ..(211.05522469880736,-149)..controls (210.65522456100436,-149) and
> (210.25522442320135,-149)
> ..(209.85522428539835,-149)..controls (209.45522414149036,-149) and
> (209.05522399758237,-149)
> ..(208.65522385367439,-149)..controls (200.95716230583835,-149) and
> (195,-155.63452868682958)
> ..(195,-163.48966401016395)..controls (195,-163.88966411101083) and
> (195,-164.28966421185771)
> ..(195,-164.68966431270459)..controls (195,-165.08966445890775) and
> (195,-165.4896646051109)
> ..(195,-165.88966475131406)..controls (195,-166.25981210471718) and
> (195,-166.62995945812031)
> ..(195,-167.00010681152344);
> picture pic;
> pic := lmt_followtext [
> text = texstring,
> path = parpath,
> spread = false,
> ];
>
>
> \stopMPpage
> \stoptext
>
> lmt_followtext crashes on this code with:
>
> metapost log > ! angle(0,0) is taken as zero.
> metapost log > <for(1)> ...0)]shifted(-wid/2,0)rotated(angle(ad))
> metapost log >
> shifted.ap;draw.pic[(EXPR0...
> metapost log > <argument> ...caled0.5pt.withcolor.green;fi;endfor
> metapost log >
> ;if((autoscaleupfollowtext...
> metapost log >
> metapost log > image->...ture;currentpicture:=nullpicture;(TEXT3)
> metapost log >
> ;currentpicture.if.str(SUF...
> metapost log >
> metapost log > followtext->...b_n;setbounds.currentpicture.to.b;)
> metapost log > endgroup
> metapost log > <argument> ...parameter"path"),getparameter"text")
> metapost log >
> ;popparameters;
> metapost log > image->...ture;currentpicture:=nullpicture;(TEXT3)
> metapost log >
> ;currentpicture.if.str(SUF...
> metapost log >
> metapost log > lmt_do_followtext->...meter"text");popparameters;)
> metapost log > endgroup
> metapost log > <scantokens> lmt_do_followtext
> metapost log >
> metapost log > <*> ...exstring, path = parpath, spread = false, ]
> metapost log > ; ;
>
>
> When I adapt the parameters that create parpath in my code, other uses
> of lmt_followtext crash. The same combinations of text and path so far
> haven’t crashed basic followtext().
>
> I’ve run into comparable situations in my own code where I had to add
> code to handle the existence of a (0,0) direction (e.g. when I had two
> identical points on a path, but that is not the case here). The above
> minimal example triggers the failure.
we can patch this
if ad <> origin : rotated(angle(ad)) fi
in mp-blob.mpiv but I expect you to test if all still works then
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
-----------------------------------------------------------------
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: lmt_followtext crashes while standard followtext itself works
2020-05-04 8:30 ` Hans Hagen
@ 2020-05-04 9:20 ` Gerben Wierda
0 siblings, 0 replies; 3+ messages in thread
From: Gerben Wierda @ 2020-05-04 9:20 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
> we can patch this
>
> if ad <> origin : rotated(angle(ad)) fi
>
> in mp-blob.mpiv but I expect you to test if all still works then
Applied and tested, it works fine.
And it also provided me with an insight about if:else:fi that was slow in coming but now that I see it, I think “Duh, you should have realised that much sooner”.
Thanks,
G
___________________________________________________________________________________
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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___________________________________________________________________________________
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