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1%D \module
2%D   [       file=typo-txt,
3%D        version=2011.10.27,
4%D          title=\CONTEXT\ Typesetting Macros,
5%D       subtitle=Text Hacks,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
12%C details.
13
14%D This module replaces the by now rather old supp-fun module.
15
16\writestatus{loading}{ConTeXt Typesetting Macros / Text Hacks}
17
18\unprotect
19
20% registerctxluafile{typo-txt}{}
21
22%D \macros
23%D   {normalizefontheight,normalizefontwidth,normalizedfontsize}
24%D
25%D Next we introduce some font manipulation macros. When we
26%D want to typeset some text spread in a well defined area, it
27%D can be considered bad practice to manipulate character and
28%D word spacing. In such situations the next few macros can be
29%D of help:
30%D
31%D \starttyping
32%D \normalizefontheight \name {sample text} {height} {font}
33%D \normalizefontwidth  \name {sample text} {width}  {font}
34%D \stoptyping
35%D
36%D Consider for instance:
37%D
38%D \startbuffer[a]
39%D \normalizefontheight \TempFont {X} {2\baselineskip} {Serif}
40%D \stopbuffer
41%D
42%D \startbuffer[b]
43%D \ruledhbox{\TempFont To Be Or Not To Be}
44%D \stopbuffer
45%D
46%D \typebuffer[a,b] \getbuffer[a]
47%D
48%D This shows up as:
49%D
50%D \startlinecorrection
51%D \ruledhbox{\getbuffer[b]}
52%D \stoplinecorrection
53%D
54%D The horizontal counterpart is:
55%D
56%D \startbuffer[a]
57%D \normalizefontwidth \TempFont {This Line Fits} {\hsize} {Serif}
58%D \stopbuffer
59%D
60%D \startbuffer[b]
61%D \ruledhbox{\TempFont This Line Fits}
62%D \stopbuffer
63%D
64%D \typebuffer[a,b] \getbuffer[a]
65%D
66%D This gives:
67%D
68%D \startlinecorrection
69%D \ruledhbox{\getbuffer[b]}
70%D \stoplinecorrection
71%D
72%D The calculated font scale is avaliable in \type {\normalizedfontsize}.
73
74\newbox\b_typo_normalizers
75
76\def\typo_normalizers_size#axis#size%
77  {\dimexpr\ifdim#1\b_typo_normalizers=\zeropoint
78     \bodyfontsize
79   \else
80     \luaexpr{\number\dimexpr10pt\relax*\number\dimexpr#size\relax/\number#axis\b_typo_normalizers}\scaledpoint
81   \fi\relax}
82
83\def\typo_normalizers_font_at_size#axis#cs#text#size#font% avoid overflow by using lua
84  {\begingroup
85   \setbox\b_typo_normalizers\hbox{\definedfont[#font at 10pt]\settrialtypesetting#text}%
86   \normalexpanded{\endgroup\edef\noexpand\normalizedfontsize{\the\typo_normalizers_size{#axis}{#size}}}%
87   \definefont[\strippedcsname#cs][#font at \normalizedfontsize]}
88
89\unexpanded\def\typo_normalizers_text_at_size#axis#font#size#text%
90  {\dontleavehmode
91   \begingroup
92   \setbox\b_typo_normalizers\hbox{\definedfont[#font at 10pt]\settrialtypesetting#text}%
93   \definedfont[#font at \the\typo_normalizers_size{#axis}{#size}]#text%
94   \endgroup}
95
96\def\normalizedfontsize{\bodyfontsize}
97
98\unexpanded\def\normalizetextwidth {\typo_normalizers_text_at_size\wd}
99\unexpanded\def\normalizetextheight{\typo_normalizers_text_at_size\ht}
100\unexpanded\def\normalizetextdepth {\typo_normalizers_text_at_size\dp}
101\unexpanded\def\normalizetextline  {\typo_normalizers_text_at_size\htdp}
102
103\unexpanded\def\normalizefontwidth {\typo_normalizers_font_at_size\wd}
104\unexpanded\def\normalizefontheight{\typo_normalizers_font_at_size\ht}
105\unexpanded\def\normalizefontdepth {\typo_normalizers_font_at_size\dp}
106\unexpanded\def\normalizefontline  {\typo_normalizers_font_at_size\htdp}
107
108\unexpanded\def\widthspanningtext #text#size#specification{\hbox{\normalizefontwidth \temp{#text}{#size}{#specification}\temp#text}}
109\unexpanded\def\heightspanningtext#text#size#specification{\hbox{\normalizefontheight\temp{#text}{#size}{#specification}\temp#text}}
110\unexpanded\def\depthspanningtext #text#size#specification{\hbox{\normalizefontdepth \temp{#text}{#size}{#specification}\temp#text}}
111\unexpanded\def\linespanningtext  #text#size#specification{\hbox{\normalizefontline  \temp{#text}{#size}{#specification}\temp#text}}
112
113%D Traditionally we use UpperCasedNames for this kind of functionality.
114
115\let\NormalizeFontHeight   \normalizefontheight
116\let\NormalizeFontWidth    \normalizefontwidth
117\let\NormalizeTextHeight   \normalizetextheight
118\let\NormalizeTextWidth    \normalizetextwidth
119
120\let\WidthSpanningText     \widthspanningtext
121
122\def\TheNormalizedFontSize{\normalizedfontsize}
123
124%D \macros
125%D   {vulgarfraction}
126%D
127%D This code is moved from \type {cor-mis.mkiv}. We show three versions. First
128%D the simple one using \type {\low} and \type {high}:
129%D
130%D \startbuffer
131%D \def\vfrac#1#2%
132%D   {\hbox{\high{\tx#1\kern-.25em}/\low{\kern-.25em\tx#2}}}
133%D
134%D test \vfrac{1}{2} test \vfrac{123}{456} test
135%D \stopbuffer
136%D
137%D \typebuffer {\showmakeup\getbuffer}
138%D
139%D A better way to handle the kerning is the following, here we kind of assume
140%D that tye slash is symmetrical and has nearly zero width.
141%D
142%D \startbuffer
143%D \def\vfract#1#2%
144%D   {\hbox{\high{\tx#1}\hbox to \zeropoint{\hss/\hss}\low{\tx#2}}}
145%D \stopbuffer
146%D
147%D \typebuffer {\showmakeup\getbuffer}
148%D
149%D The third and best alternative is the following:
150%D
151%D {\showmakeup\getbuffer}\crlf\getbuffer
152%D
153%D This time we measure the height of the \type {/} and shift over the maximum
154%D height and depths of this character and the fractional digits (we use 57 as
155%D sample). Here we combine all methods in one macros.
156
157\setnewconstant\vulgarfractionmethod\plusthree
158
159\definehspace[\v!vulgarfraction][.25em] % [.15em]
160\definesymbol[\v!vulgarfraction][/]     % [\raise.2ex\hbox{/}]
161
162\unexpanded\def\vulgarfraction#1#2%
163  {\dontleavehmode
164   \hbox
165     {\def\vulgarfraction{vulgarfraction}%
166      \ifcase\vulgarfractionmethod
167        #1\symbol[\v!vulgarfraction]#2%
168      \or
169        \high{\tx#1\kern-\hspaceamount\empty\v!vulgarfraction}%
170        \symbol[\vulgarfraction]%
171        \low {\kern-\hspaceamount\empty\v!vulgarfraction\tx#2}%
172      \or
173        \high{\tx#1}%
174        \hbox to \zeropoint{\hss\symbol[\v!vulgarfraction]\hss}%
175        \low{\tx#2}%
176      \or
177        \setbox0\hbox{\symbol[\vulgarfraction]}%
178        \setbox2\hbox{\txx57}%
179        \raise\ht0\hbox{\lower\ht2\hbox{\txx#1}}%
180        \hbox to \zeropoint{\hss\symbol[\v!vulgarfraction]\hss}%
181        \lower\dp0\hbox{\raise\dp2\hbox{\txx#2}}%
182      \fi}}
183
184\ifdefined\vfrac \else \let\vfrac\vulgarfraction \fi
185
186%D \starttabulate[|l|l|]
187%D \HL
188%D \NC \bf method \NC \bf visualization \NC\NR
189%D \HL
190%D \NC 0 \NC \vulgarfractionmethod0 \vulgarfraction{1}{2} \NC\NR
191%D \NC 1 \NC \vulgarfractionmethod1 \vulgarfraction{1}{2} \NC\NR
192%D \NC 2 \NC \vulgarfractionmethod2 \vulgarfraction{1}{2} \NC\NR
193%D \NC 3 \NC \vulgarfractionmethod3 \vulgarfraction{1}{2} \NC\NR
194%D \HL
195%D \stoptabulate
196
197%D This is used in the beginners manual. One needs to set the font size to an
198%D acceptable value for this to work.
199
200\unexpanded\def\startnicelyfilledbox
201  {\vbox\bgroup
202   \forgetall
203   \dosingleempty\dostartnicelyfilledbox}
204
205\def\dostartnicelyfilledbox[#1]%
206  {\letdummyparameter\c!width \hsize
207   \letdummyparameter\c!height\vsize
208   \letdummyparameter\c!offset\exheight % we obey to the outer exheight
209   \letdummyparameter\c!strut \v!yes    % we obey to the inner strut !
210   \getdummyparameters[#1]%
211   \scratchoffset\dummyparameter\c!offset\relax
212   \setbox\scratchbox\vbox to \dummyparameter\c!height \bgroup
213   \hsize\dummyparameter\c!width\relax
214   \emergencystretch10\scratchoffset
215   \parfillskip\zeropoint
216   \baselineskip\zeropoint plus \onepoint minus \onepoint
217   \beginofshapebox
218   \leftskip \scratchoffset
219   \rightskip\scratchoffset}
220
221\unexpanded\def\stopnicelyfilledbox
222  {\doifelse{\dummyparameter\c!strut}\v!yes
223     {\xdef\doflushnicelyfilledbox
224        {\ht\shapebox\the\strutht
225         \dp\shapebox\the\strutdp
226         \box\shapebox}}%
227     {\gdef\doflushnicelyfilledbox
228        {\box\shapebox}}%
229   \endofshapebox
230   \doreshapebox
231     {\doflushnicelyfilledbox}
232     {\penalty\shapepenalty}
233     {\kern\shapekern}
234     {\vfil}%
235   \kern\scratchoffset
236   \vfilneg
237   \flushshapebox
238   \vfilneg
239   \kern\scratchoffset
240   \egroup
241   \box\scratchbox
242   \egroup}
243
244\protect \endinput
245