2019-05-29 19:20:00

1 files changed, 0 insertions, 390 deletions

diff --git a/doc/context/sources/general/fonts/fonts/fonts-tricks.tex b/doc/context/sources/general/fonts/fonts/fonts-tricks.tex
deleted file mode 100644
index 65b210e2c..000000000
--- a/doc/context/sources/general/fonts/fonts/fonts-tricks.tex
+++ /dev/null
@@ -1,390 +0,0 @@
-% language=uk
-
-\startcomponent fonts-tricks
-
-\environment fonts-environment
-
-\startchapter[title=Tricks][color=middleorange]
-
-\startsection[title=Introduction]
-
-In this chapter topics that don't fit in the previous chapters are
-collected.
-
-\stopsection
-
-\startsection[title=Extra characters]
-
-In one of our projects we need a small (high) minus and here we discuss
-one way of achieving this. An option is to define a new character
-and use a font feature to add it, as in:
-
-\starttyping
-\startluacode
-  local function addextraminus(tfmdata)
-    fonts.helpers.addprivate(tfmdata, "smallminus", ... ) -- see below
-    fonts.helpers.addprivate(tfmdata, "highminus",  ... ) -- see below
-  end
-  fonts.constructors.newfeatures.otf.register {
-    name        = "extraminus",
-    description = "extra minus symbols",
-    default     = true,
-    manipulators = {
-      base = addextraminus,
-      node = addextraminus,
-    }
-  }
-\stopluacode
-\stoptyping
-
-However, why make it an option when we can just add it to any font. So,
-we can end up with just:
-
-\typebuffer[extraminus] % already defined before loading fonts
-
-It is important to do this before fonts get loaded. Next we need to decide how to
-access these characters. A straightforward way is:
-
-\startbuffer
-\def\smallminus{\privatechar{smallminus}}
-\def\highminus {\privatechar{highminus}}
-\stopbuffer
-
-\typebuffer \getbuffer
-
-An alternative is:
-
-\starttyping
-\definemathcommand [smallminus] [ord] {\privatechar{smallminus}}
-\definemathcommand [highminus]  [ord] {\privatechar{highminus}}
-\stoptyping
-
-but that fails in text mode. So, we can consider:
-
-\starttyping
-\def\smallminus{\mathortext{\mathord{\privatechar{smallminus}}}{\privatechar{smallminus}}}
-\def\highminus {\mathortext{\mathord{\privatechar {highminus}}}{\privatechar {highminus}}}
-\stoptyping
-
-or more compact
-
-\starttyping
-\def\smallminus{\mathortext\mathord\firstofoneargument{\privatechar{smallminus}}}
-\def\highminus {\mathortext\mathord\firstofoneargument{\privatechar {highminus}}}
-\stoptyping
-
-What method you choose depends on usage. With the first, simple definitions we
-get this:
-
-\startbuffer
-[\getprivateslot{smallminus}] [\getprivatechar{smallminus}] [\smallminus] $[\smallminus]$\par
-[\getprivateslot {highminus}] [\getprivatechar {highminus}] [\highminus ] $[\highminus ]$\par
-\stopbuffer
-
-\typebuffer \getbuffer
-
-Because we are fully expandable we can even use this in:
-
-\startbuffer
-\bTABLE[aligncharacter=yes,alignmentcharacter={text->\smallminus}]
-  \bTR \bTD \mathminus100\smallminus00+ \eTD \eTR
-  \bTR \bTD           100\smallminus00  \eTD \eTR
-  \bTR \bTD \mathminus 99\smallminus00+ \eTD \eTR
-  \bTR \bTD \mathminus 99\smallminus00  \eTD \eTR
-  \bTR \bTD           100\highminus     \eTD \eTR
-\eTABLE
-\stopbuffer
-
-\typebuffer
-
-\startlinecorrection
-\getbuffer
-\stoplinecorrection
-
-With the other definitions the alignment would not work. If you need both then
-you can define different commands for text and math.
-
-\stopsection
-
-\startsection[title=Tabular numbers]
-
-Some font features are meant to be used in controlled situations. An example is
-the \type {tnum} feature that triggers so called \quote {tabular figures} meaning
-numbers that have equal widths. Its opposite feature is \type {lnum} or lining
-figures. We have two predefined \CONTEXT\ font features for this:
-
-\starttyping
-\definefontfeature [inlinenumbers]  [lnum=yes,tnum=no]
-\definefontfeature [tabularnumbers] [tnum=yes,lnum=no]
-\stoptyping
-
-Some mechanisms in \CONTEXT\ had better be aware of this and one of them is the
-alignment mechanism in tables.
-
-\startbuffer[demo]
-\startcombination[before=,after=]
-    \startcontent
-        \switchtobodyfont[pagella]\showglyphs%
-        \disabledirectives[typesetters.characteralign.autofont]%
-        \bTABLE[alignmentcharacter=.,aligncharacter=yes]
-            \bTR \bTD  11.111 \eTD \eTR
-            \bTR \bTD   2.2   \eTD \eTR
-            \bTR \bTD 444.444 \eTD \eTR
-        \eTABLE
-        \enabledirectives[typesetters.characteralign.autofont]%
-    \stopcontent
-    \startcaption
-        \small manual \type {tnum}
-    \stopcaption
-    \startcontent
-        \switchtobodyfont[pagella]\showglyphs%
-        \bTABLE[alignmentcharacter=.,aligncharacter=yes]
-            \bTR \bTD  11.111 \eTD \eTR
-            \bTR \bTD   2.2   \eTD \eTR
-            \bTR \bTD 444.444 \eTD \eTR
-        \eTABLE
-    \stopcontent
-    \startcaption
-        \small auto \type {tnum}
-    \stopcaption
-\stopcombination
-\stopbuffer
-
-In the following examples we demonstrate how the automatic font adaption makes
-sure that tabular figures are used. The table is defined as:
-
-\typebuffer[demo]
-
-\startbuffer
-\dontleavehmode\hbox to .3\textwidth \bgroup
-    \hss\getbuffer[demo]\hss
-\egroup
-\stopbuffer
-
-In \in {figure}[fig:tabularnumbers] we see what the features do. We use the \type
-{\feature} or \type {\addfeature} macro for this. For the moment this trickery is
-controlled by a directive (beware: enabling them is global).
-
-\startplacefigure[reference=fig:tabularnumbers,title={Tabular numbers}]
-    \startcombination[nx=3,ny=2]
-        {\getbuffer}                             {\tt\nohyphens default}
-        {\addfeature  [inlinenumbers]\getbuffer} {\tt\nohyphens inlinenumbers}
-        {\addfeature [tabularnumbers]\getbuffer} {\tt\nohyphens tabularnumbers}
-        {\addfeature[oldstylenumbers]\getbuffer} {\tt\nohyphens oldstylenumbers}
-        {\addfeature[oldstylenumbers]%
-         \addfeature  [inlinenumbers]\getbuffer} {\tt\nohyphens oldstylenumbers\par inlinenumbers}
-        {\addfeature[oldstylenumbers]%
-         \addfeature [tabularnumbers]\getbuffer} {\tt\nohyphens oldstylenumbers\par tabularnumbers}
-    \stopcombination
-\stopplacefigure
-
-\stopsection
-
-\startsection[title=Symbols]
-
-You can access glyphs by name but you need to know that name, for example:
-
-\startbuffer
-\definefontsynonym [bends] [file:manfnt.afm]
-
-\startsymbolset [Dangerous Bends]
-    \definesymbol [dbend]   [\resolvedglyphdirect{bends}{n:char_7e}]
-    \definesymbol [lhdbend] [\resolvedglyphdirect{bends}{n:char_7f}]
-\stopsymbolset
-
-\setupsymbolset [Dangerous Bends]
-
-Two dangerous bends: \symbol{dbend} and \symbol{lhdbend}.
-\stopbuffer
-
-\typebuffer
-
-You can best save the fonts you use that way in a place that doesn't get
-overwritten because names can change.
-
-\getbuffer
-
-\stopsection
-
-\startsection[title=Alternative styles]
-
-\startbuffer[demo]
-    \start
-        \getbuffer[setup]
-        \subject{[ {\myslanted myslanted} ] [ {\it it} ] [ {\slanted slanted} ] [ $x=1$ ]}
-        [ {\myslanted myslanted} ] [ {\it it} ] [ {\slanted slanted} ] [ $x=1$ ]
-        \typebuffer[setup]
-        \blackrule[width=\hsize,height=1pt,depth=0pt]
-    \stop
-\stopbuffer
-
-In section heads we want a nested style (e.g.\ italic) to adapt to the main font.
-The following definitions shows how you can influence that process. We use the
-following \type {demo} buffer as sample:
-
-\typebuffer[demo]
-
-\startbuffer
-\blackrule[width=\hsize,height=1pt,depth=0pt]
-
-\startbuffer[setup]
-\setuphead[subject][style=\tfb,before=,after=]
-\definealternativestyle [myslanted] [\it] []
-\stopbuffer
-
-\getbuffer[demo]
-
-\startbuffer[setup]
-\setuphead[subject][style=\tfb,before=,after=]
-\definealternativestyle [myslanted] [\it] [\bi]
-\stopbuffer
-
-\getbuffer[demo]
-
-\startbuffer[setup]
-\setuphead[subject][style=\tfb,before=,after=]
-\definealternativestyle [myslanted] [\it] [\tf]
-\stopbuffer
-
-\getbuffer[demo]
-
-\startbuffer[setup]
-\definealternativestyle [myslanted] [\normalitalicface]
-\setuphead[subject][style=bold,before=,after=]
-\stopbuffer
-
-\getbuffer[demo]
-
-\startbuffer[setup]
-\definealternativestyle [myslanted] [\normalitalicface]
-\setuphead[subject][style=\bfd,before=,after=]
-\stopbuffer
-
-\getbuffer[demo]
-
-\startbuffer[setup]
-\definealternativestyle [myslanted] [\slantedface]
-\setuphead[subject][style=boldface,before=,after=]
-\stopbuffer
-
-\getbuffer[demo]
-\stopbuffer
-
-You can influence the main method of operation with:
-
-\starttyping
-\setupalternativestyles[method=normal]
-\setupalternativestyles[method=auto]
-\stoptyping
-
-\startplacefigure[title={Alternative style methods.},reference=fig:alternativestyle]
-    \startcombination
-        {\setupalternativestyles[method=normal]\scale[width=.45\textwidth]{\framed[width=.85\textwidth,align=normal,frame=off,offset=overlay]{\getbuffer}}} {\type{method=normal}}
-        {\setupalternativestyles  [method=auto]\scale[width=.45\textwidth]{\framed[width=.85\textwidth,align=normal,frame=off,offset=overlay]{\getbuffer}}} {\type{method=auto}}
-    \stopcombination
-\stopplacefigure
-
-The result is shown in \in {figure} [fig:alternativestyle]. Relevant commands are:
-
-\starttyping
-\emphasistypeface
-\emphasisboldface
-
-\normaltypeface    \typeface
-\normalboldface    \boldface
-\normalslantedface \slantedface
-\normalitalicface  \italicface
-\swaptypeface      \swapface
-\stoptyping
-
-\stopsection
-
-\startsection[title={A virtual hack}]
-
-Here is some virtual trickery. A virtual font is just a font but instead of a
-character being a reference to a slot in a font (often via an index) it
-constructs a glyph from whatever characters, rules, displacements, inline \PDF\
-code, etc. We use them a lot deep down in \CONTEXT. The next example defines two
-characters represented by rules. This definition is about as minimalistic as
-reasonable and demonstrates how we can apply expansion (aka hz) to such a font.
-\footnote {You need \LUATEX\ 1.08 or later for this.} We store the font id (a
-number) in a macro. Watch how we don't refer to a glyph in a font. Because we
-don't specify its type as \type {virtual} we can leave out the \type {font}
-table. After all, we don't refer to real glyphs.
-
-\startbuffer
-\startluacode
-local d = 400000 -- just over 6pt
-local a = font.define {
-    characters = {
-        [string.byte("A")] =
-            {
-                width    = d,
-                depth    = d,
-                commands = { { "down", d }, { "rule", d, d } },
-                expansion_factor = 1000,
-            },
-        [string.byte("B")] =
-            {
-                width    = d,
-                height   = d,
-                commands = { { "rule", d, d } },
-                expansion_factor = 500,
-            },
-
-    },
-    parameters = {
-        space         = 2*d,
-        space_stretch = d,
-        space_shrink  = d,
-    },
-    stretch = 8,
-    shrink  = 8,
-    step    = 2,
-    name    = "foo"
-}
-
-tex.count.scratchcounter = a
-\stopluacode
-
-\edef\MyFontID{\the\scratchcounter}
-\stopbuffer
-
-\typebuffer \getbuffer
-
-% \enabletrackers[*expans*]
-
-\startbuffer
-\startoverlay
-  {\vbox \bgroup
-     \setuptolerance[verytolerant,stretch]
-     \setfontid\MyFontID
-     \dorecurse{5}{ABABABABABABABABABABABABABABABABA }
-   \egroup}
-  {\vbox \bgroup
-     \normaladjustspacing2
-     \middlegray
-     \setuptolerance[verytolerant,stretch]
-     \setfontid\MyFontID
-     \dorecurse{5}{ABABABABABABABABABABABABABABABABA }
-   \egroup}
-\stopoverlay
-\stopbuffer
-
-We test this with some rather low level code and show the result in \in {figure}
-[fig:virtualhack]. Of course you will never define a font this way if only
-because we don't set important parameters and this version is not generic in the
-sense that it scales well. You can find better examples elsewhere in the manual
-and in the distribution.
-
-\typebuffer
-
-\startplacefigure[title={A virtual hack.},reference=fig:virtualhack]
-    \getbuffer
-\stopplacefigure
-
-\stopsection
-
-\stopchapter
-
-\stopcomponent