date:20120916

Re: [NTG-context] Change color of EPS file.

2012-09-16 Thread Henning Hraban Ramm

2012/9/15 Troy Henderson thend...@gmail.com:
 Utilities are available in abundance which can transform raster graphics
 from color to grayscale, but until I created this yesterday, I have never
 seen a utility that keeps the graphic in vector format (i.e., never
 rasterizes it throughout the conversion) and converts it from color to
 grayscale.  Until I read this thread, I guess I thought I was the only one
 that desired such a tool.  I'm glad to see that at least I'm not alone.

Oh, there are, but I know only commercial (e.g. OneVision Asura) or
in-house solutions (like what I managed at a newspaper several years
ago).
The simple (or simplistic) rgbcolor patch doesn't work with
complicated EPS, of course. But then you'd need to know the structure
of your EPS. It's hard to get that right for arbitrary EPS. And there
aren't that many able PostScript programmers left.
E.g. at that newspaper we were able to switch spot colors just before
plate exposition; the trick was to use a generic spot color name
throughout the workflow and to change its definition in the completed
page EPS. (At that time our printing press was too small to print
all pages in full color.)

Since PostScript is a full programming language, most PS generators
use shortcuts (macros/functions) that wrap the originally simple
commands, so you often can't track down where the structure hides that
you'd like to change. Best solution is often to do a full expansion
with a PS interpreter and write a new, better readable, but mostly
much bigger code. pstoedit is your friend for that – e.g. Hans did
some nice tricks with EPS pictures converted to MetaPost.

I once experimented a bit with changing colors of embedded bitmap
images – it's rather easy to do, but never looks right without a deep
understanding of color management and its strange implementation in
PostScript...

Greetlings, Hraban
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Re: [NTG-context] \everymath

2012-09-16 Thread Wolfgang Schuster


Am 16.09.2012 um 01:32 schrieb Rogers, Michael K mrog...@emory.edu:

 I often want every math mode (between single $) be \displaystyle.  In Plain 
 TeX, you do something like
 
 \everymath={\displaystyle}
 
 Is the best ConTeXt way to do something like this?
 
 \appendtoks\displaystyle\to\everymathematics
 
 Or is there a key in \setupmathematics?


I don’t think so because I found only the command below the change the 
appearance
of inline formulas and \displaymath/\displaymathematics isn’t what you want 
because
it creates a display formula.

\let\normalstopdmath\Ustopdisplaymath % to prevent error message from 
\displaymath

\starttext

\mathematics   {\frac{1}{2}}
\displaymathematics{\frac{1}{2}}
\inlinemathematics {\frac{1}{2}}

\displaymath{\frac{1}{2}}
\inlinemath {\frac{1}{2}}
\textmath   {\frac{1}{2}}

\stoptext

Wolfgang
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Re: [NTG-context] MKII MKIV difference between \textrule

2012-09-16 Thread Hans Hagen


On 14-9-2012 13:26, Wolfgang Schuster wrote:


Am 14.09.2012 um 00:08 schrieb Alessandro Perucchi alessan...@perucchi.org:


Hello,

In my experimentation, I've found that in mkii and mkiv the behavior of 
\textrule and \setuptextrule are different...

What I did was quite simple:

\textrule{Testing head}
blah blah blah
\textrule

in mkii the text in well centered between the lines.
But in mkiv the bottom line is too near the text, and I need to add something 
like \blank[halfline] to have a similar behavior as mkii.


There is a vertical skip missing in the MkIV version of the macros.

pack-mrl.mkiv

\def\pack_textrule_following#1%
   {\doifelsenothing{#1}
-{\nointerlineskip
+
{\vskip\dimexpr\strutdp+.5ex\ifdim\prevdepth\strutdp\else\ifdim\prevdepth\zeropoint-\prevdepth\fi\fi\relax
+ \nointerlineskip
   \dontleavehmode\vbox
 {\color[\directtextrulesparameter\c!rulecolor]

{\hrule\s!depth\directtextrulesparameter\c!rulethickness\s!height\zeropoint\s!width\availablehsize}}}
  {\pack_textrule_with_text{#1}}%
\ifvmode
  \prevdepth\zeropoint
\fi}


actually that's the commented code ...

\pack_textrule_correct_depth

... i'm still not that convinced if that correction always looks right 
(i've reenabled it but it might become an option)





And apparently the command \starttextrule ... \stoptextrule doesn't work (this was 
explain in the cont-entp.pdf page 204) in either mkii  mliv.


This does work for me:

\starttext

blah blah blah

\starttextrule{Testing head}
blah blah blah
\stoptextrule

blah blah blah

\stoptext

Wolfgang
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Re: [NTG-context] Strange bug with reversed itemize

2012-09-16 Thread Hans Hagen


On 15-9-2012 20:06, Aditya Mahajan wrote:

On Sat, 15 Sep 2012, Wolfgang Schuster wrote:



Am 15.09.2012 um 00:06 schrieb Aditya Mahajan adit...@umich.edu:


Thanks for the diagnosis. What will be a good way to fix this? I
think that

\expanded{\setupcounter[#1][\c!start=\ifx\p_start\empty0\else\number\p_start\fi.,...]}


should work (but I haven't tested it yet).



I would do the expansion here but with \normalexpanded.

\def\strc_counter_setup_using_parameter#1#2% name \someparameter
 {\edef\p_start{#2\c!start}%
 %\setupcounter
  \normalexpanded{\setupcounter
[#1]
[  \c!start=\ifx\p_start\empty0\else\number\p_start\fi,
   \c!state=#2\c!state, % beware,  == start
 \c!way=#2\c!way,
   %
  \c!prefix=#2\c!prefix,
  \c!prefixseparatorset=#2\c!prefixseparatorset,
\c!prefixconversion=#2\c!prefixconversion,
 \c!prefixconversionset=#2\c!prefixconversionset,
   \c!prefixstarter=#2\c!prefixstarter,
   \c!prefixstopper=#2\c!prefixstopper,
   \c!prefixset=#2\c!prefixset,
  \c!prefixsegments=#2\c!prefixsegments,
   \c!prefixset=#2\c!prefixset,
 \c!prefixconnector=#2\c!prefixconnector,
   %
  \c!numberseparatorset=#2\c!numberseparatorset,
\c!numberconversion=#2\c!numberconversion,
 \c!numberconversionset=#2\c!numberconversionset,
   \c!numberstarter=#2\c!numberstarter,
   \c!numberstopper=#2\c!numberstopper,
 %\c!numbersegments=#2\c!numbersegments]}
  \c!numbersegments=#2\c!numbersegments]}}


Thanks.

Hans, can you add this to strc-num.mkiv?


Sure, as I assume that Wolfgang investigated possible side effects.

Hans

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 | www.pragma-pod.nl
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Re: [NTG-context] Referring to multiple elements

2012-09-16 Thread Marco Patzer

2012-09-14 Sietse Brouwer sbbrou...@gmail.com:

Hi Sietse,

I'm sorry for my late reply.

 The heart of what you need is a lua function that will take an array
 of numbers, and return an array of consective-number runs, like so:

 […]

 I've written one below, plus the scaffolding required to feed it the
 right input, and print its output to ConTeXt.

I wonder if this function is not already present in ConTeXt. The
register mechanism, for instance, already does something very
similar:

\setupregister
  [index]
  [compress=yes]

\starttext

A\index{A} \page
A\index{A} \page
aaa\page
bbb\page
A\index{A} \page
A\index{A} \page
A\index{A}

\placeindex %% = A 1-2, 5-7

\stoptext

 Only two functions still need writing --- one to turn the context
 argument [fig:f1, fig:f2, fig:f4] into a lua array of strings, and
 one to turn each reference string into a figure number.

I'm quite sure that all the building blocks are already present. I'm
not sure about the case when the float number is preceded by a
chapter number.

 If you're not comfortable with programming LuaTeX, say so and I can
 fill in the two missing functions sometime this weekend. But they
 should be doable, really.

Someone with more expertise and knowledge about the ConTeXt
internals should be able to point to the relevant functions. I guess
the code that produces the index compression is located in
registers.flush() in strc-reg.lua, but apparently it's not a
function and I don't know if it can be adopted for the float
referencing.

 (And, of course, you may be far more experienced in LuaTeX than I,
 I don't know.)

Probably not. I can read and write simple Lua scripts, but I lack
knowledge about the LuaTeX and ConTeXt internals and the data
structures used. For LuaTeX there is a manual that explains a lot,
but it doesn't help figuring out how ConTeXts float referencing
mechanism works.

Thanks for the work you spend on this. I don't need this function
for the current project (I use the workaround), but I would like to
see this feature in ConTeXt. If you have time and expertise to
implement this, it would be great. Otherwise I'll do the range
referencing manually.


Regards
Marco

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[NTG-context] [.tuc] oddity when storing a table

2012-09-16 Thread Philipp Gesang

Hi all,

I can’t explain the following behavior of the .tuc writer. When
passed a nested hash, context fails on the second pass if the
array part of the first nesting depth is empty:

···

%% the commented lines work
\startluacode
  job.variables.tobesaved.foo = { bar = {  } }
  -- job.variables.tobesaved.foo = { works now,  bar = {  } }
  -- job.variables.tobesaved.foo = { bar =  works too }
\stopluacode

\starttext foo \stoptext

···

I get this error:

···
  ! LuaTeX error ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: 
no string to print
  stack traceback:
[C]: in function 'flush'
...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: in function 
...text/tex/texmf-context/tex/context/base/cldf-ini.lua:360
(tail call): ?
...text/tex/texmf-context/tex/context/base/core-uti.lua:112: in function 
'initializer'
...text/tex/texmf-context/tex/context/base/core-uti.lua:200: in function 
'load'
...text/tex/texmf-context/tex/context/base/core-uti.lua:66: in function 
'initialize'
main ctx instance:1: in main chunk.
  
  system   tex  error on line 1 in file 
/home/phg/context/tex/texmf-context/tex/context/base/cont-yes.mkiv: LuaTeX 
error  ...
···

Bug?

Regards
Philipp




pgpU2Xa6DgoT6.pgp
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Re: [NTG-context] [.tuc] oddity when storing a table

2012-09-16 Thread Hans Hagen


On 16-9-2012 19:17, Philipp Gesang wrote:

Hi all,

I can’t explain the following behavior of the .tuc writer. When
passed a nested hash, context fails on the second pass if the
array part of the first nesting depth is empty:

···

%% the commented lines work
\startluacode
   job.variables.tobesaved.foo = { bar = {  } }
   -- job.variables.tobesaved.foo = { works now,  bar = {  } }
   -- job.variables.tobesaved.foo = { bar =  works too }
\stopluacode

\starttext foo \stoptext

···

I get this error:

···
   ! LuaTeX error ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: 
no string to print
   stack traceback:
 [C]: in function 'flush'
 ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: in function 
...text/tex/texmf-context/tex/context/base/cldf-ini.lua:360
 (tail call): ?
 ...text/tex/texmf-context/tex/context/base/core-uti.lua:112: in function 
'initializer'
 ...text/tex/texmf-context/tex/context/base/core-uti.lua:200: in function 
'load'
 ...text/tex/texmf-context/tex/context/base/core-uti.lua:66: in function 
'initialize'
 main ctx instance:1: in main chunk.

   system   tex  error on line 1 in file 
/home/phg/context/tex/texmf-context/tex/context/base/cont-yes.mkiv: LuaTeX error  ...
···

Bug?


no, feature. job variables are just key/values and accessible at the tex 
end (you store 'works too' in 'bar')


if you want arbitrary data to be stores you need to used datasets, as 
explained in


http://wiki.contextgarden.net/Command/definedataset

-
  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
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Re: [NTG-context] Change color of EPS file.

Re: [NTG-context] \everymath

Re: [NTG-context] MKII MKIV difference between \textrule

Re: [NTG-context] Strange bug with reversed itemize

Re: [NTG-context] Referring to multiple elements

[NTG-context] [.tuc] oddity when storing a table

Re: [NTG-context] [.tuc] oddity when storing a table

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