[NTG-context] directlua question
I am trying to extract something from a string with a \directlua call, the last
word of a string in case:
\directlua{tex.print(string.match(“This is a string","%s%a$"))}
However, the %s%a are not working with the TeX-error “unfinished string near
eof”. Obviously caused by the %’s.
How to get this working? \textpercent will not do, off course within Luacode.
dr. Hans van der Meer
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___
Re: [NTG-context] directlua question
On 4 Dec 2018, at 13:29, Hans van der Meer wrote:
> I am trying to extract something from a string with a \directlua call, the
> last word of a string in case:
>
> \directlua{tex.print(string.match(“This is a string","%s%a$"))}
>
> However, the %s%a are not working with the TeX-error “unfinished string near
> eof”. Obviously caused by the %’s.
> How to get this working? \textpercent will not do, off course within Luacode.
Also I tried to no avail
\begingroup\catcode`\%=12\relax\directlua{tex.print(string.match(“This is a
string","%s%a$"))}\endgroup
dr. Hans van der Meer
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___
Re: [NTG-context] directlua question
Hans van der Meer schrieb am 04.12.18 um 13:29:
I am trying to extract something from a string with a \directlua call,
the last word of a string in case:
\directlua{tex.print(string.match(“This is a string","%s%a$"))}
However, the %s%a are not working with the TeX-error “unfinished string
near eof”. Obviously caused by the %’s.
How to get this working? \textpercent will not do, off course within
Luacode.
% = \letterpercent
$ = \letterdollar
You can also replace
\directlua{tex.print(...)}
with
\ctxlua{context(...)}
or
\cldcontext{...}
Wolfgang
___
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
___
Re: [NTG-context] graphics
On Tue, 4 Dec 2018 18:03:14 +0100 Hans Hagen wrote: > Hi, > > As most mechanism are reasonable okay now we can look into what > future versions of ConteXt should provide in terms of functionality. > The (luatex) engine is also more of less finished or at least stable > in terms of functionality. > > One possible area of further development is graphics so I'd like to > know if there are (reasonable) demands for more graphics support > using metapost. Alan and I are on-and-off working on some extensions > and one of the things we discuss is visualization of data. The > question is of course what should be done in the lua/mp/tex > combination and what externally but the combination has some > advantages. There has been presentations and discussions at the last > meeting and graphics is always a nice topic, and also kind of > rewarding in terms of development. > > Of course other demands can be formulated too, but these then need to > come with well defined descriptions (or mockup examples). Hans is alluding to work that we are doing to explore the possibilities of lua + MetaPost in the treatment and visualization of data, efficiently, with the possibility of handling large quantities of data. Lua does this particularly well. My first exercise has been a complete rewrite of the John Hobby graph macros. It was/is an exercise in recreating the functionality "from scratch", trying to use lua effectively when needed. The code and approach is entirely new. My use case was the analysis of a large set of data - entirely ridiculous for graphical display but containing "outliers" or instances that are significant, and it works! I am trying to generalize, and am doing this in my "free time". So the aim is two-fold: 1) to efficiently handle large datasets through the use of lua 2) to generalize the notion of user data space from the two-dimensional drawing space of MetaPost (and the represented page), and affine transformations of this 2D space to other coordinate systems and dimensions. We are not thinking about 3D rendering or raytracing, but rather simple projections and other transformations such as polar coordinates. (Of course, log scales, for example are a "simple" non-linear transformation.) I guess that Hans would like to expand the discussion to the future of graphics in general, inviting input from everybody. Alan ___ 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 ___
Re: [NTG-context] Macro to write a vector with Metafun (again)
On 12/4/2018 4:38 PM, Fabrice Couvreur wrote: Hello Hans, The macro to draw a vector does not work even with the latest version of context standalone. Thank you Fabrice \useMPlibrary[mat] % will be in meta-imp-mat.mkiv just watch in there .. we redid these stackers with more control (and they also live in their own instance now) ... 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 ___
[NTG-context] Macro to write a vector with Metafun (again)
Hello Hans,The macro to draw a vector does not work even with the
latest version of context standalone.
Thank you
Fabrice
\useMPlibrary[mat]
% will be in meta-imp-mat.mkiv
\startMPextensions
vardef math_stacker_arrow_shape =
image (
drawarrow
(OverlayWidth,OverlayOffset) -- (0,OverlayOffset)
withcolor
OverlayLineColor ;
setbounds currentpicture to boundingbox currentpicture
bottomenlarged (OverlayOffset/2) topenlarged (OverlayOffset/2) ;
)
enddef ;
vardef math_stacker_leftarrow_shape =
math_stacker_arrow_shape
enddef ;
vardef math_stacker_rightarrow_shape =
math_stacker_arrow_shape rotated 180
enddef ;
\stopMPextensions
\startuniqueMPgraphic{math:stacker:\number"2190}
math_stacker_draw(math_stacker_leftarrow_shape) ;
\stopuniqueMPgraphic
\startuniqueMPgraphic{math:stacker:\number"2192}
math_stacker_draw(math_stacker_rightarrow_shape) ;
\stopuniqueMPgraphic
% so far
\setupmathstackers
[both] % vfenced]
[color=darkred,
alternative=mp]
\setupmathstackers
[top]
[color=darkred,
alternative=mp]
\setupmathstackers
[bottom]
[color=darkred,
alternative=mp]
\starttext
$\overbracket {a+b+c+d} \quad \underbracket{a+b+c+d} \quad
\doublebracket{a+b+c+d}$ \blank
$\overparent{a+b+c+d} \quad \underparent {a+b+c+d} \quad
\doubleparent {a+b+c+d}$ \blank
$\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad
\doublebrace {a+b+c+d}$ \blank
$\overbar {a+b+c+d} \quad \underbar{a+b+c+d} \quad
\doublebar{a+b+c+d}$ \blank
$\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank
$\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank
\stoptext
___
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
___
[NTG-context] graphics
Hi, As most mechanism are reasonable okay now we can look into what future versions of ConteXt should provide in terms of functionality. The (luatex) engine is also more of less finished or at least stable in terms of functionality. One possible area of further development is graphics so I'd like to know if there are (reasonable) demands for more graphics support using metapost. Alan and I are on-and-off working on some extensions and one of the things we discuss is visualization of data. The question is of course what should be done in the lua/mp/tex combination and what externally but the combination has some advantages. There has been presentations and discussions at the last meeting and graphics is always a nice topic, and also kind of rewarding in terms of development. Of course other demands can be formulated too, but these then need to come with well defined descriptions (or mockup examples). 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 ___
