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%D \module
%D [ file=font-gds,
%D version=2012.06.26,
%D title=\CONTEXT\ Font Support,
%D subtitle=Helpers,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Font Support / Helpers}
%D Here we collect code moved from other files, like some of the
%D support modules.
\unprotect
%D \macros
%D {normalizefontheight,normalizefontwidth,normalizedfontsize}
%D
%D Next we introduce some font manipulation macros. When we
%D want to typeset some text spread in a well defined area, it
%D can be considered bad practice to manipulate character and
%D word spacing. In such situations the next few macros can be
%D of help:
%D
%D \starttyping
%D \normalizefontheight \name {sample text} {height} {font}
%D \normalizefontwidth \name {sample text} {width} {font}
%D \stoptyping
%D
%D Consider for instance:
%D
%D \startbuffer[a]
%D \NormalizeFontHeight \TempFont {X} {2\baselineskip} {Serif}
%D \stopbuffer
%D
%D \startbuffer[b]
%D \ruledhbox{\TempFont To Be Or Not To Be}
%D \stopbuffer
%D
%D \typebuffer[a,b] \getbuffer[a]
%D
%D This shows up as:
%D
%D \startlinecorrection
%D \ruledhbox{\getbuffer[b]}
%D \stoplinecorrection
%D
%D The horizontal counterpart is:
%D
%D \startbuffer[a]
%D \NormalizeFontWidth \TempFont {This Line Fits} {\hsize} {Serif}
%D \stopbuffer
%D
%D \startbuffer[b]
%D \ruledhbox{\TempFont This Line Fits}
%D \stopbuffer
%D
%D \typebuffer[a,b] \getbuffer[a]
%D
%D This gives:
%D
%D \startlinecorrection
%D \ruledhbox{\getbuffer[b]}
%D \stoplinecorrection
%D
%D The calculated font scale is avaliable in \type {\normalizedfontsize}.
\unexpanded\def\font_helpers_normalize_size#what#cs#text#width#specification%
{\bgroup
\setbox\scratchbox\hbox{\definedfont[#specification at 10pt]#text}%
\normalexpanded{\egroup\edef\noexpand\normalizedfontsize
{\the\dimexpr\ifdim\wd\scratchbox>\zeropoint
\luaexpr{\number\dimexpr10pt\relax*\number\dimexpr#width\relax/\number#what\scratchbox}\scaledpoint
\else
\bodyfontsize
\fi\relax}}%
\definefont[\strippedcsname#cs][#specification at \normalizedfontsize]}
\def\NormalizedFontSize{\bodyfontsize}
\unexpanded\def\normalizefontwidth {\font_helpers_normalize_size\wd}
\unexpanded\def\normalizefontheight{\font_helpers_normalize_size\ht}
\unexpanded\def\normalizefontdepth {\font_helpers_normalize_size\dp}
\unexpanded\def\normalizefontline {\font_helpers_normalize_size\htdp}
\unexpanded\def\widthspanningtext #text#width#specification{\hbox{\normalizefontwidth \temp{#text}{#width}{#specification}\temp#text}}
\unexpanded\def\heightspanningtext#text#width#specification{\hbox{\normalizefontheight\temp{#text}{#width}{#specification}\temp#text}}
\unexpanded\def\depthspanningtext #text#width#specification{\hbox{\normalizefontdepth \temp{#text}{#width}{#specification}\temp#text}}
\unexpanded\def\linespanningtext #text#width#specification{\hbox{\normalizefontline \temp{#text}{#width}{#specification}\temp#text}}
\let\NormalizeFontHeight \normalizefontheight
\let\NormalizeFontWidth \normalizefontwidth
\let\WidthSpanningText \widthspanningtext
\def\TheNormalizedFontSize{\normalizefontsize}
\protect \endinput
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