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if not modules then modules = { } end modules ['grph-rul'] = {
version = 1.001,
comment = "companion to grph-rul.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local attributes = attributes
local nodes = nodes
local context = context
local ruleactions = nodes.rules.ruleactions
local userrule = nodes.rules.userrule
local bpfactor = number.dimenfactors.bp
local pdfprint = pdf.print
local getattribute = tex.getattribute
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local mpcolor = attributes.colors.mpcolor
local trace_mp = false trackers.register("rules.mp", function(v) trace_mp = v end)
local report_mp = logs.reporter("rules","mp")
local floor = math.floor
local random = math.random
local formatters = string.formatters
do
local simplemetapost = metapost.simple
local cachesize = 0
local maxcachesize = 256*1024
local cachethreshold = 1024
local caching = false -- otherwise random issues so we need a dedicated randomizer first
-- local maxcachesize = 8*1024
-- local cachethreshold = 1024/2
local cache = table.setmetatableindex(function(t,k)
local v = simplemetapost("rulefun",k) -- w, h, d
cachesize = cachesize + #v
if cachesize > maxcachesize then
-- print("old",cachesize)
for k, v in next, t do
local n = #v
if n > cachethreshold then
t[k] = nil
cachesize = cachesize - n
end
end
-- print("new",cachesize)
end
-- print(cachesize,maxcachesize,cachethreshold,#v)
t[k] = v
return v
end)
local replacer = utilities.templates.replacer
local predefined = {
["fake:word"] = replacer [[
FakeWord(%width%,%height%,%depth%,%line%,%color%);
]],
["fake:rule"] = replacer[[
%initializations%
FakeRule(%width%,%height%,%depth%,%line%,%color%);
]],
["fake:rest"] = replacer [[
RuleDirection := "%direction%" ;
RuleOption := "%option%" ;
RuleWidth := %width% ;
RuleHeight := %height% ;
RuleDepth := %depth% ;
RuleThickness := %line% ;
RuleFactor := %factor% ;
RuleOffset := %offset% ;
def RuleColor = %color% enddef ;
%data%;
]]
}
local initialized = false ;
ruleactions.mp = function(p,h,v,i,n)
local name = p.name or "fake:rest"
local code = (predefined[name] or predefined["fake:rest"]) {
data = p.data or "",
width = p.width * bpfactor,
height = p.height * bpfactor,
depth = p.depth * bpfactor,
factor = (p.factor or 0) * bpfactor, -- needs checking
offset = p.offset or 0,
line = (p.line or 65536) * bpfactor,
color = mpcolor(p.ma,p.ca,p.ta),
option = p.option or "",
direction = p.direction or "TLT",
}
if not initialized then
initialized = true
simplemetapost("rulefun",formatters["randomseed := %s;"](random(0,4095)))
end
local pdf = caching and cache[code] or simplemetapost("rulefun",code) -- w, h, d
if trace_mp then
report_mp("code: %s",code)
report_mp("pdf : %s",pdf)
end
if pdf and pdf ~= "" then
pdfprint("direct",pdf)
end
end
end
do
local f_rectangle = formatters["%F w %F %F %F %F re %s"]
local f_radtangle = formatters[ [[
%F w %F %F m
%F %F l %F %F %F %F y
%F %F l %F %F %F %F y
%F %F l %F %F %F %F y
%F %F l %F %F %F %F y
h %s
]] ]
ruleactions.fill = function(p,h,v,i,n)
local l = (p.line or 65536)*bpfactor
local r = p and (p.radius or 0)*bpfactor or 0
local w = h * bpfactor
local h = v * bpfactor
local m = nil
local t = i == "fill" and "f" or "s"
local o = l / 2
if r > 0 then
w = w - o
h = h - o
m = f_radtangle(l, r,o, w-r,o, w,o,w,r, w,h-r, w,h,w-r,h, r,h, o,h,o,h-r, o,r, o,o,r,o, t)
else
w = w - l
h = h - l
m = f_rectangle(l,o,o,w,h,t)
end
pdfprint("direct",m)
end
ruleactions.draw = ruleactions.fill
ruleactions.stroke = ruleactions.fill
end
interfaces.implement {
name = "frule",
arguments = { {
{ "width", "dimension" },
{ "height", "dimension" },
{ "depth", "dimension" },
{ "radius", "dimension" },
{ "line", "dimension" },
{ "type", "string" },
{ "data", "string" },
{ "name", "string" },
} } ,
actions = function(t)
local r = userrule(t)
local ma = getattribute(a_colorspace) or 1
local ca = getattribute(a_color)
local ta = getattribute(a_transparency)
if t.type == "mp" then
t.ma = ma
t.ca = ca
t.ta = ta
else
r[a_colorspace] = ma
r[a_color] = ca
r[a_transparency] = ta
end
context(r)
end
}
interfaces.implement {
name = "fakeword",
arguments = { {
{ "factor", "dimension" },
{ "name", "string" }, -- can be type
{ "min", "dimension" },
{ "max", "dimension" },
{ "n", "integer" },
} } ,
actions = function(t)
local factor = t.factor or 0
local rule = userrule {
height = 1.25*factor,
depth = 0.25*factor,
width = floor(random(t.min,t.max)/10000) * 10000,
line = 0.10*factor,
ma = getattribute(a_colorspace) or 1,
ca = getattribute(a_color),
ta = getattribute(a_transparency),
type = "mp",
name = t.name,
}
context(rule)
end
}
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