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% language=us
\environment luametafun-style
\startcomponent luametafun-outline
\startchapter[title={Outline}]
In a regular text you can have outline characters by setting a (pseudo) font
feature but sometimes you want to play a bit more with this. In \METAFUN\ we
always had that option. In \MKII\ we call \type {pstoedit} to turn text into
outlines, in \MKIV\ we do that by manipulating the shapes directly. And, as with
some other extensions, in \LMTX\ a new interface has been added, but the
underlying code is the same as in \MKIV.
\startbuffer[1a]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello"
kind = "draw",
drawcolor = "darkblue",
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
\startbuffer[1b]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello",
kind = "both",
fillcolor = "middlegray",
drawcolor = "darkgreen",
rulethickness = 1/5,
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
In \in {figure} [outline:1] we see two examples:
\typebuffer[1a][option=TEX]
and
\typebuffer[1b][option=TEX]
\startplacefigure[reference=outline:1,title={Drawing and|/|or filling an outline.}]
\startcombination
{\getbuffer[1a]} {\type {kind=draw}}
{\getbuffer[1b]} {\type {kind=both}}
\stopcombination
\stopplacefigure
Normally the fill ends up below the draw but we can reverse the order, as in
\in {figure} [outline:2], where we coded the leftmost example as:
\startbuffer[2a]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello",
kind = "reverse",
fillcolor = "darkred",
drawcolor = "darkblue",
rulethickness = 1/2,
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
\startbuffer[2b]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello",
kind = "both",
fillcolor = "darkred",
drawcolor = "darkblue",
rulethickness = 1/2,
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
\typebuffer[2a][option=TEX]
\startplacefigure[reference=outline:2,title={Reversing the order of drawing and filling.}]
\startcombination
{\getbuffer[2a]} {\type {kind=reverse}}
{\getbuffer[2b]} {\type {kind=both}}
\stopcombination
\stopplacefigure
It is possible to fill and draw in one operation, in which case the same color is
used for both, see \in {figure} [outline:3] for an example fo this. This is a low
level optimization where the shape is only output once.
\startbuffer[3a]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello",
kind = "fillup",
fillcolor = "darkgreen",
rulethickness = 1/5,
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
\startbuffer[3b]
\startMPcode{doublefun}
draw lmt_outline [
text = "hello",
kind = "fill",
fillcolor = "darkgreen",
rulethickness = 1/5,
] xsized .45TextWidth ;
\stopMPcode
\stopbuffer
\startplacefigure[reference=outline:3,title={Combining a fill with a draw in the same color.}]
\startcombination
{\getbuffer[3a]} {\type {kind=fillup}}
{\getbuffer[3b]} {\type {kind=fill}}
\stopcombination
\stopplacefigure
This interface is much nicer than the one where each variant (the parameter \type
{kind} above) had its own macro due to the need to group properties of the
outline and fill. Let's show some more:
\startbuffer[4]
\startMPcode{doublefun}
draw lmt_outline [
text = "\obeydiscretionaries\samplefile{tufte}",
align = "normal",
kind = "draw",
drawcolor = "darkblue",
] xsized TextWidth ;
\stopMPcode
\stopbuffer
\typebuffer[4][option=TEX]
In this case we feed the text into the \type {\framed} macro so that we get a
properly aligned paragraph of text, as demonstrated in \in {figure} [outline:4]
\in {and} [outline:5]. If you want more trickery you can of course use any
\CONTEXT\ command (including \type {\framed} with all kind of options) in the
text.
\startplacefigure[reference=outline:4,title={Outlining a paragraph of text.}]
\getbuffer[4]
\stopplacefigure
\startbuffer[5]
\startMPcode{doublefun}
draw lmt_outline [
text = "\obeydiscretionaries\samplefile{ward}",
align = "normal,tolerant",
style = "bold",
width = 10cm,
kind = "draw",
drawcolor = "darkblue",
] xsized TextWidth ;
\stopMPcode
\stopbuffer
\typebuffer[5][option=TEX]
\startplacefigure[reference=outline:4,title={Outlining a paragraph of text with a specific width.}]
\getbuffer[5]
\stopplacefigure
We summarize the parameters:
\starttabulate[|T|T|T|p|]
\FL
\BC name \BC type \BC default \BC comment \NC \NR
\ML
\NC text \NC string \NC \NC \NC \NR
\NC kind \NC string \NC draw \NC One of \type {draw}, \type {fill}, \type {both}, \type {reverse} and \type {fillup}. \NC \NR
\NC fillcolor \NC string \NC \NC \NC \NR
\NC drawcolor \NC string \NC \NC \NC \NR
\NC rulethickness \NC numeric \NC 1/10 \NC \NC \NR
\NC align \NC string \NC \NC \NC \NR
\NC style \NC string \NC \NC \NC \NR
\NC width \NC numeric \NC \NC \NC \NR
\LL
\stoptabulate
\stopchapter
\stopcomponent
|
