Re: [dev-context] Re: [NTG-context] Bug in math accents (analyzed)

2004-11-01 Thread Hans Hagen 
Taco has found the reason why \mathaccents may get dislocated in slanted 
or italic fonts

The problem is that your code does not set \skewchar for the \scriptfont
and \scriptscriptfont of the relevant math families. You need to make sure
you set all three of \textfont X, \scriptfont X and \scriptscriptfont X.
This requires some minor rewriting of a few macros in font-ini.tex.
I could do that for you, but my coding style is not even remotely
similar to yours so I wager you'd rather do it yourself. ;-)
font-ini needs the following patch
\appendtoks
\dosetmathfamily\mrfam\textface\scriptface\scriptscriptface\c!mr\mrfallback
  \dosetmathfamily\mifam\textface\scriptface\scriptscriptface\c!mi\empty
  \dosetmathfamily\syfam\textface\scriptface\scriptscriptface\c!sy\empty
  \dosetmathfamily\exfam\textface\textface  \textface\c!ex\empty
  \dosetmathfamily\mafam\textface\scriptface\scriptscriptface\c!ma\empty
  \dosetmathfamily\mbfam\textface\scriptface\scriptscriptface\c!mb\empty
  \dosetmathfamily\mcfam\textface\scriptface\scriptscriptface\c!mc\empty
  \dosetmathfamily\nnfam\textface\scriptface\scriptscriptface\c!nn\empty
\to \mathstrategies
\appendtoks
  \dosetskewchar\mifam\defaultskewcharmi % implemented later on
  \dosetskewchar\syfam\defaultskewcharsy % implemented later on
\to \mathstrategies
\def\dosetskewchar#1#2%
  {\ifx\@@fontskewchar\empty
 \skewchar\textfont#1#2%
 \skewchar\scriptfont  #1#2%
 \skewchar\scriptscriptfont#1#2%
   \else
 \skewchar\textfont#1\@@fontskewchar
 \skewchar\scriptfont  #1\@@fontskewchar
 \skewchar\scriptscriptfont#1\@@fontskewchar
   \fi}
i'll patch the distribution
Hans
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  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
 | www.pragma-pod.nl
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Re: [NTG-context] Bug in math accents

2004-10-28 Thread Hans Hagen 
Leif Albers wrote:
Two years ago I already posted about following bug. I am
amazed it still occurs in the present (beta) version of
ConTeXt.
When I use math accents (like \tilde) on top of italic
characters in subscripts, they appear displaced.
A trivial example is
 SNIPP 
\starttext
  $ E_{\tilde s} $
\stoptext
 SNIPP 
Compare the output to the plain TeX output of
$ E_{\tilde s} $ \end, and you will see the
difference - watch the position of the accent.

hm, it depends on the definition of \tilde; i must look into that
\starttext
$ E_{\tilde s} $
$ E_{\def\tilde{\mathaccent707E }\tilde s} $
{\~s}
\stoptext
Maybe some italic correction is needed here; or a tilde from an italic 
font : question for Taco, btw, in contex, \tilde in this case expands to

\mathaccent 0\purefamilyhex {mr}7E
which is the plain definition, so i wonder what goes wrong there.
I really like the design of ConTeXt. But as long as this bug
occurs, ConTeXt is useless to me.
Dear developers: *please* send me a reply of some
sort. Writing bug reports is time consuming and should at
least be rewarded with a single line response. Even a
RTFM - you idiot is better than no reaction at all.
(this mail ended up at the wrong date in my mailbox, so i only see it now)
Hans
-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
 | www.pragma-pod.nl
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Re: [NTG-context] Bug in math accents

2004-10-28 Thread Taco Hoekwater 
On Thu, 28 Oct 2004 13:14:46 +0200
Hans Hagen [EMAIL PROTECTED] wrote:

 
 Maybe some italic correction is needed here; or a tilde from an italic 
 font : question for Taco, btw, in contex, \tilde in this case expands to
 
 \mathaccent 0\purefamilyhex {mr}7E
 
 which is the plain definition, so i wonder what goes wrong there.

My initial feeling is that the relevant font parameters are perhaps wrong or 
even non-existant. (this would not show up in the expansion debug info, of 
course). I cannot investigate a.t.m., but if nobody else is able and willing,
I look into it next week.

Greetings, Taco
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Re: [NTG-context] Bug in math accents

2004-09-23 Thread Taco Hoekwater 

Hi Leif,

On Tue, 21 Sep 2004 18:27:33 +0200, Leif wrote:

I can see this is a bug, but  do not understand exactly howwhy it appears.
\tilde expands into \mathaccent as in plain (that expansion is correct), and
the used font metrics files are the same as well. Therefore, it almost certainly 
has to be a \skewchar bug. However, the ConTeXt source looks fine to me,
so I am stuck.


-- 
groeten,

Taco
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[NTG-context] Bug in math accents

2004-09-22 Thread Leif Albers 

Two years ago I already posted about following bug. I am
amazed it still occurs in the present (beta) version of
ConTeXt.

When I use math accents (like \tilde) on top of italic
characters in subscripts, they appear displaced.

A trivial example is

 SNIPP 
\starttext
  $ E_{\tilde s} $
\stoptext
 SNIPP 

Compare the output to the plain TeX output of
$ E_{\tilde s} $ \end, and you will see the
difference - watch the position of the accent.

I really like the design of ConTeXt. But as long as this bug
occurs, ConTeXt is useless to me.

Dear developers: *please* send me a reply of some
sort. Writing bug reports is time consuming and should at
least be rewarded with a single line response. Even a
RTFM - you idiot is better than no reaction at all.

Thanks,

Leif Albers


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