Re: [NTG-context] Size of fences, factor key

25 Apr 2018


      On 4/25/2018 7:29 AM, Mikael P. Sundqvist wrote:
...
On Sat, Apr 21, 2018 at 7:30 PM, Mikael P. Sundqvist mailto:mickep@gmail.com> wrote:
Dear Hans and others,
I'm usually use the \big, \Big, \bigg etc to get the size of
    parentheses, brackets and braces to be the size I want. I realize
    that the fences machinery is probably a cleaner way of doing this.
I tried it a bit, and it usually gives the result I like. But
    sometimes not, and it seems that the way to change the size of the
    parentheses/brackets/braces is to use the factor key.
1) Are the different options none, auto NUMBER explained somehere?
    2) Could one have, for exceptional cases where the default is not
    satisfactory, a keyword like factor=big for example, to get the same
    size as if one would have used \big?
I am a bit confused. See the example below, with output (from latest
    standalone) attached.
/Mikael
PS: I would suggest to have
      italic       = { feature = 'ss01', value = 1, comment =
    "Mathematical Alternative Lowercase Italic" },
    set in lucida-opentype-math.lfg. In all books (on math) I have seen,
    I think this is what is used.
%%% Example file:
\setupbodyfont[lucidaot]
\definemathfence[Set][left="007B,right="007D,command=yes]
\startbuffer
    \startformula
    \Set{x\in\mathbb R~:~x^2=1}
    \stopformula
    \stopbuffer
\startTEXpage[offset=3bp]
\startformula
    \{x\in\mathbb R~:~ x^2=1\}%Too small
    \stopformula
\startformula
    \bigl\{x\in\mathbb R~:~ x^2=1\bigr\}%I like this one
    \stopformula
\startformula
    \Bigl\{x\in\mathbb R~:~ x^2=1\Bigr\}%Too big
    \stopformula
\getbuffer
\setupmathfence[Set][factor=1]%I like this one
    \getbuffer
\setupmathfence[Set][factor=auto]%Too big
    \getbuffer
%\setupmathfence[Set][factor=big]%Perhaps this could work? Or
    size=big or something
    %\getbuffer
    \stopTEXpage
I hate to do this, but a small *bump*
(If it is unclear what I'm asking for, I could try to clarify)
sort of unclear indeed


these big things are tricky as in plain tex they depends on font 
dimensions and forced scaling but in context we have abit more control 
over these sizes

you can add this to cont-new.mkiv

\unprotect

\unexpanded\def\math_fenced_fenced_indeed[#1]#2%
   {\iffirstargument\setupcurrentmathfence[#1]\fi
    \math_fenced_fenced_common
    \edef\p_size{\mathfenceparameter\c!size}%
    \ifx\p_size\empty\else
 
\attribute\mathsizeattribute\numexpr\bigmathdelimitervariant*\plushundred+\p_size\relax
    \fi
    \math_fenced_left
    #2%
    \math_fenced_right
    \stopusemathstyleparameter
    \endgroup
    \advance\c_math_fenced_nesting\minusone}

\protect

and then do

\setupbodyfont[lucidaot]

\definemathfence[Set][left="007B,right="007D,command=yes]

\startTEXpage[offset=1ex]
     \startformula
         \Set{x\in\mathbb R~:~x^2=1}
     \stopformula
     \startformula
         \Set[size=2]{x\in\mathbb R~:~x^2=1}
     \stopformula
     \startformula
         \Set[size=3]{x\in\mathbb R~:~x^2=1}
     \stopformula
     \startformula
         \Set[size=4]{x\in\mathbb R~:~x^2=1}
     \stopformula
\stopTEXpage


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