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Diffstat (limited to 'tex/generic/context/luatex/luatex-fonts-demo-tt.lua')
| -rw-r--r-- | tex/generic/context/luatex/luatex-fonts-demo-tt.lua | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/tex/generic/context/luatex/luatex-fonts-demo-tt.lua b/tex/generic/context/luatex/luatex-fonts-demo-tt.lua new file mode 100644 index 000000000..45c9a84ff --- /dev/null +++ b/tex/generic/context/luatex/luatex-fonts-demo-tt.lua @@ -0,0 +1,136 @@ +if not modules then modules = { } end modules ['luatex-fonts-demo-tt'] = { + version = 1.001, + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files", +} + +-- Someone asked on the list if we could fake bad typewriters. Actually there are +-- already enough examples in successive articles and it's not too complex to mess +-- with fonts. There is a nicer way to do this (with a bit of metapost) but I have +-- no time now. After all, features like this are never used in practice, so it's a +-- waste of time to code them. +-- +-- Todo: force emwidth/5 for fonts > 1 ... only when requested. +-- +-- \starttext +-- +-- \raggedright +-- +-- \definefontfeature[badtypewritera][ttgrayness=.5] +-- \definefontfeature[badtypewriterb][ttshift=.5] +-- \definefontfeature[badtypewriterc][ttthickness=2] +-- \definefontfeature[badtypewriterd][ttgrayness=.5,ttshift=.5,ttthickness=2,ttfont={dejavusansmono}] +-- \definefontfeature[badtypewritere][ttgrayness=.5,ttthickness=2,ttstep=2,ttmax=1.5] +-- +-- \definefont[MyFontA][file:luatex-fonts-demo-tt.lua*badtypewritera] +-- \definefont[MyFontB][file:luatex-fonts-demo-tt.lua*badtypewriterb] +-- \definefont[MyFontC][file:luatex-fonts-demo-tt.lua*badtypewriterc] +-- \definefont[MyFontD][file:luatex-fonts-demo-tt.lua*badtypewriterd @ 10pt] +-- \definefont[MyFontE][file:luatex-fonts-demo-tt.lua*badtypewritere @ 10pt] +-- +-- \MyFontA \input tufte \blank {\righttoleft لَيْسَ لَدَيَّ أَيُّ فِكْرَةٍ عَمَّا يَعْنِيهِ هٰذَا.} \page +-- \MyFontB \input tufte \blank {\righttoleft لَيْسَ لَدَيَّ أَيُّ فِكْرَةٍ عَمَّا يَعْنِيهِ هٰذَا.} \page +-- \MyFontC \input tufte \blank {\righttoleft لَيْسَ لَدَيَّ أَيُّ فِكْرَةٍ عَمَّا يَعْنِيهِ هٰذَا.} \page +-- \MyFontD \input tufte \blank {\righttoleft لَيْسَ لَدَيَّ أَيُّ فِكْرَةٍ عَمَّا يَعْنِيهِ هٰذَا.} \page +-- \MyFontE \input tufte \blank {\righttoleft لَيْسَ لَدَيَّ أَيُّ فِكْرَةٍ عَمَّا يَعْنِيهِ هٰذَا.} \page +-- +-- \stoptext + +local random, sin = math.random, math.sin +local formatters = string.formatters + +local now = 0 +local max = 2 * math.pi +local step = max/20 + +-- The sin trick is first shown by Hartmut in 2005 when we had a few more plugs into +-- the backend. His demo was a rather colorful sheet that looked like it was crumpled. +-- There were no virtual fonts involved the, just pdf.print hooked into an always +-- applied Lua function. + +function fonts.helpers.FuzzyFontStart(exheight,ttgrayness,ttthickness,ttshift,ttstep,ttmax) + local grayness = ttgrayness * random(0,5)/10 + local thickness = ttthickness * random(1,2)/10 + local shift = 0 + if ttstep > 0 then + if now > max then + now = 0 + else + now = now + step * ttstep + end + shift = ttmax * sin(now) * exheight/5 + else + shift = ttshift * random(-1,1) * exheight/20 + end + -- We can optimize for one of them being zero or the default but no one will + -- use this in production so efficiency hardly matters. + local template = formatters["pdf:page:q %0.2F g %.2F G %0.2F w 2 Tr %.3F Ts"]( + grayness, grayness, thickness, shift + ) + vf.special(template) + -- will be: + -- local template = formatters["q %0.2F g %.2F G %0.2F w 2 Tr %.3F Ts"]( + -- grayness, grayness, thickness, shift + -- ) + -- vf.pdf("page",template) +end + +function fonts.helpers.FuzzyFontStop() + vf.special("pdf:page:Q") + -- will be: + -- vf.pdf("page","Q") +end + +return function(specification) + local features = specification.features.normal + local list = features.ttfont + if list then + list = utilities.parsers.settings_to_array(list) + else + list = { + 'lmtypewriter10-regular', + 'almfixed', + } + end + local f = { } + local id = { } + for i=1,#list do + f[i], id[i] = fonts.constructors.readanddefine(list[i],specification.size) + end + local f1 = f[1] + if f1 then + f1.name = specification.name -- needs checking (second time used an error) + f1.properties.name = specification.name + f1.properties.virtualized = true + f1.fonts = { } + local target = f1.characters + local exbp = f1.parameters.exheight * number.dimenfactors.bp + local stop = { + "lua", + "fonts.helpers.FuzzyFontStop()", + } + local start = { + "lua", + formatters["fonts.helpers.FuzzyFontStart(%.3F,%.2F,%.2F,%.2F,%.2F,%.2F)"]( + exbp, + tonumber(features.ttgrayness) or 1, + tonumber(features.ttthickness) or 1, + tonumber(features.ttshift) or 1, + tonumber(features.ttstep) or 0, + tonumber(features.ttmax) or 1 + ), + } + for i=1,#list do + f1.fonts[i] = { id = id[i] } + local characters = f[i].characters + for u, v in next, characters do + v.commands = { start, { "slot", i, u }, stop } + if characters ~= target then + target[u] = v + end + end + end + end + return f1 +end |