clipping in metafun has weird side effects
Dear all, I stumbled upon some very weird behaviour of clipping in metafun/context. When I add some clipped pictures to currentpicture and draw something dashed, some subsequent lines will also be drawn dashed. This behaviour only shows up with context but not with mptopdf or mpost. I attached a minimal example and the corresponding output of context and mptopdf. I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the result is the same in both. Tobias --
Hi again, I tried my example from yesterday in context with metapost format, but the output still differs from what mptopdf produces. While doing that, I noticed that the mpost format is currently not usable out of the box: \startMPcode{metapost} draw (0,0) -- (1cm,0) ; \stopMPcode produces the error message
mfun_first_run true ! Equation cannot be performed (numeric=boolean).
and the same for 'mfun_trial_run'. Simply adding boolean mfun_trial_run, mfun_first_run ; to texmf/metapost/base/mpost.mp resolved the issue for me. However, that may introduce other complications that I have no idea of. Tobias On Thu, Oct 30, 2014 at 08:56:34PM +0100, Tobias Columbus wrote:
Dear all,
I stumbled upon some very weird behaviour of clipping in metafun/context. When I add some clipped pictures to currentpicture and draw something dashed, some subsequent lines will also be drawn dashed.
This behaviour only shows up with context but not with mptopdf or mpost. I attached a minimal example and the corresponding output of context and mptopdf.
I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the result is the same in both.
Tobias
--
vardef mycircle = save c ; picture c ; c := nullpicture ; addto c contour fullcircle scaled 2mm ; c enddef ;
def a expr p = path _p_ ; _p_ := p ; a_impl enddef ;
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ;
def b expr p = path _p_ ; _p_ := p ; b_impl enddef ;
def b_impl text t = begingroup save c; picture c ; c := mycircle ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ; beginfig(1)
a (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; a (0,0) -- (1cm,0) ;
currentpicture := currentpicture shifted (-2cm, 0.5cm );
b (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; b (0,0) -- (1cm,0) ;
endfig ; end
--
On 10/31/2014 9:58 AM, Tobias Columbus wrote:
Hi again,
I tried my example from yesterday in context with metapost format, but the output still differs from what mptopdf produces.
While doing that, I noticed that the mpost format is currently not usable out of the box:
\startMPcode{metapost} draw (0,0) -- (1cm,0) ; \stopMPcode
produces the error message
\startMPcode draw (0,0) -- (1cm,0) ; \stopMPcode why the {metapost}
mfun_first_run true ! Equation cannot be performed (numeric=boolean).
and the same for 'mfun_trial_run'. Simply adding
boolean mfun_trial_run, mfun_first_run ;
to texmf/metapost/base/mpost.mp resolved the issue for me. However, that may introduce other complications that I have no idea of.
Tobias
On Thu, Oct 30, 2014 at 08:56:34PM +0100, Tobias Columbus wrote:
Dear all,
I stumbled upon some very weird behaviour of clipping in metafun/context. When I add some clipped pictures to currentpicture and draw something dashed, some subsequent lines will also be drawn dashed.
This behaviour only shows up with context but not with mptopdf or mpost. I attached a minimal example and the corresponding output of context and mptopdf.
I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the result is the same in both.
Tobias
--
vardef mycircle = save c ; picture c ; c := nullpicture ; addto c contour fullcircle scaled 2mm ; c enddef ;
def a expr p = path _p_ ; _p_ := p ; a_impl enddef ;
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ;
def b expr p = path _p_ ; _p_ := p ; b_impl enddef ;
def b_impl text t = begingroup save c; picture c ; c := mycircle ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ; beginfig(1)
a (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; a (0,0) -- (1cm,0) ;
currentpicture := currentpicture shifted (-2cm, 0.5cm );
b (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; b (0,0) -- (1cm,0) ;
endfig ; end
-- ----------------------------------------------------------------- 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 -----------------------------------------------------------------
On Fri, Oct 31, 2014 at 10:05:35AM +0100, Hans Hagen wrote:
On 10/31/2014 9:58 AM, Tobias Columbus wrote:
Hi again,
I tried my example from yesterday in context with metapost format, but the output still differs from what mptopdf produces.
While doing that, I noticed that the mpost format is currently not usable out of the box:
\startMPcode{metapost} draw (0,0) -- (1cm,0) ; \stopMPcode
produces the error message
\startMPcode draw (0,0) -- (1cm,0) ; \stopMPcode
why the {metapost}
I wanted to know if the impact of clipping is caused by the metafun format. According to the wiki page http://wiki.contextgarden.net/Command/defineMPinstance the instances "metapost" and "metafun" are predefined and can be used by \startMPcode{instance} ... \stopMPcode where metafun is the default instance, i.e. used when there is no instance given.
mfun_first_run true ! Equation cannot be performed (numeric=boolean).
and the same for 'mfun_trial_run'. Simply adding
boolean mfun_trial_run, mfun_first_run ;
to texmf/metapost/base/mpost.mp resolved the issue for me. However, that may introduce other complications that I have no idea of.
Tobias
On Thu, Oct 30, 2014 at 08:56:34PM +0100, Tobias Columbus wrote:
Dear all,
I stumbled upon some very weird behaviour of clipping in metafun/context. When I add some clipped pictures to currentpicture and draw something dashed, some subsequent lines will also be drawn dashed.
This behaviour only shows up with context but not with mptopdf or mpost. I attached a minimal example and the corresponding output of context and mptopdf.
I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the result is the same in both.
Tobias
--
vardef mycircle = save c ; picture c ; c := nullpicture ; addto c contour fullcircle scaled 2mm ; c enddef ;
def a expr p = path _p_ ; _p_ := p ; a_impl enddef ;
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ;
def b expr p = path _p_ ; _p_ := p ; b_impl enddef ;
def b_impl text t = begingroup save c; picture c ; c := mycircle ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ; beginfig(1)
a (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; a (0,0) -- (1cm,0) ;
currentpicture := currentpicture shifted (-2cm, 0.5cm );
b (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; b (0,0) -- (1cm,0) ;
endfig ; end
--
----------------------------------------------------------------- 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 ___________________________________________________________________________________
--
On 10/31/2014 10:15 AM, Tobias Columbus wrote:
On Fri, Oct 31, 2014 at 10:05:35AM +0100, Hans Hagen wrote:
On 10/31/2014 9:58 AM, Tobias Columbus wrote:
Hi again,
I tried my example from yesterday in context with metapost format, but the output still differs from what mptopdf produces.
While doing that, I noticed that the mpost format is currently not usable out of the box:
\startMPcode{metapost} draw (0,0) -- (1cm,0) ; \stopMPcode
produces the error message
\startMPcode draw (0,0) -- (1cm,0) ; \stopMPcode
why the {metapost}
I wanted to know if the impact of clipping is caused by the metafun format. According to the wiki page http://wiki.contextgarden.net/Command/defineMPinstance the instances "metapost" and "metafun" are predefined and can be used by
\startMPcode{instance} ... \stopMPcode
where metafun is the default instance, i.e. used when there is no instance given.
i fixed the metapost run and also added basic text support in it (next beta)
mfun_first_run true ! Equation cannot be performed (numeric=boolean).
and the same for 'mfun_trial_run'. Simply adding
boolean mfun_trial_run, mfun_first_run ;
to texmf/metapost/base/mpost.mp resolved the issue for me. However, that may introduce other complications that I have no idea of.
Tobias
On Thu, Oct 30, 2014 at 08:56:34PM +0100, Tobias Columbus wrote:
Dear all,
I stumbled upon some very weird behaviour of clipping in metafun/context. When I add some clipped pictures to currentpicture and draw something dashed, some subsequent lines will also be drawn dashed.
This behaviour only shows up with context but not with mptopdf or mpost. I attached a minimal example and the corresponding output of context and mptopdf.
I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the result is the same in both.
Tobias
--
vardef mycircle = save c ; picture c ; c := nullpicture ; addto c contour fullcircle scaled 2mm ; c enddef ;
def a expr p = path _p_ ; _p_ := p ; a_impl enddef ;
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ;
def b expr p = path _p_ ; _p_ := p ; b_impl enddef ;
def b_impl text t = begingroup save c; picture c ; c := mycircle ; addto currentpicture also c t ; addto currentpicture doublepath _p_ t ; endgroup enddef ; beginfig(1)
a (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; a (0,0) -- (1cm,0) ;
currentpicture := currentpicture shifted (-2cm, 0.5cm );
b (0,0) -- (1cm,0) dashed evenly ; currentpicture := currentpicture shifted (2cm,0) ; b (0,0) -- (1cm,0) ;
endfig ; end
--
----------------------------------------------------------------- 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 ___________________________________________________________________________________
-- ----------------------------------------------------------------- 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 -----------------------------------------------------------------
On 10/31/2014 10:15 AM, Tobias Columbus wrote:
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ;
try this to see what happens: % clip c to bbox c scaled 0.5 ; draw bbox c scaled 0.5 ; and then this to solve it: clip c to bbox (c scaled 0.5) ; ----------------------------------------------------------------- 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 -----------------------------------------------------------------
On Fri, Oct 31, 2014 at 12:22:37PM +0100, Hans Hagen wrote:
On 10/31/2014 10:15 AM, Tobias Columbus wrote:
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ;
try this to see what happens:
% clip c to bbox c scaled 0.5 ; draw bbox c scaled 0.5 ;
and then this to solve it:
clip c to bbox (c scaled 0.5) ;
I tried your suggestions and attached both the example and output. Drawing and clipping solves the problem indeed. But using only the modified clip either does not solve the problem, or I am just too stupid to implement your solution. Note also that in the modified example the context output coincides with the mptopdf output if one draws the label before calling "test" the second time. (I marked the position in the metapost file.) Sorry for probably getting on your nerves ...
----------------------------------------------------------------- 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 ___________________________________________________________________________________
--
On 10/31/2014 1:33 PM, Tobias Columbus wrote:
On Fri, Oct 31, 2014 at 12:22:37PM +0100, Hans Hagen wrote:
On 10/31/2014 10:15 AM, Tobias Columbus wrote:
def a_impl text t = begingroup save c ; picture c ; c := mycircle ; clip c to bbox c scaled 0.5 ;
try this to see what happens:
% clip c to bbox c scaled 0.5 ; draw bbox c scaled 0.5 ;
and then this to solve it:
clip c to bbox (c scaled 0.5) ;
I tried your suggestions and attached both the example and output. Drawing and clipping solves the problem indeed. But using only the modified clip either does not solve the problem, or I am just too stupid to implement your solution.
Note also that in the modified example the context output coincides with the mptopdf output if one draws the label before calling "test" the second time. (I marked the position in the metapost file.)
Sorry for probably getting on your nerves ...
hopefully ok in next beta 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 -----------------------------------------------------------------
On Sun, Nov 02, 2014 at 11:29:24AM +0100, Hans Hagen wrote:
On 10/31/2014 1:33 PM, Tobias Columbus wrote:
On Fri, Oct 31, 2014 at 12:22:37PM +0100, Hans Hagen wrote:
On 10/31/2014 10:15 AM, Tobias Columbus wrote:
>def a_impl text t = > begingroup > save c ; picture c ; c := mycircle ; > clip c to bbox c scaled 0.5 ;
try this to see what happens:
% clip c to bbox c scaled 0.5 ; draw bbox c scaled 0.5 ;
and then this to solve it:
clip c to bbox (c scaled 0.5) ;
I tried your suggestions and attached both the example and output. Drawing and clipping solves the problem indeed. But using only the modified clip either does not solve the problem, or I am just too stupid to implement your solution.
Note also that in the modified example the context output coincides with the mptopdf output if one draws the label before calling "test" the second time. (I marked the position in the metapost file.)
Sorry for probably getting on your nerves ...
hopefully ok in next beta
Hans
Seems to be fixed in 2014.11.02 12:23. Thank you very much! Tobias
----------------------------------------------------------------- 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 ___________________________________________________________________________________
--
participants (2)
-
Hans Hagen -
Tobias Columbus