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if not modules then modules = { } end modules ['lpdf-grp'] = {
version = 1.001,
comment = "companion to lpdf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format = string.format
local nodeinjections = backends.pdf.nodeinjections
local codeinjections = backends.pdf.codeinjections
local registrations = backends.pdf.registrations
local pdfdictionary = lpdf.dictionary
local pdfarray = lpdf.array
local pdfconstant = lpdf.constant
local pdfreference = lpdf.reference
local pdfflushobject = lpdf.flushobject
local function shade(stype,name,domain,color_a,color_b,n,colorspace,coordinates)
local f = pdfdictionary {
FunctionType = 2,
Domain = pdfarray(domain), -- domain is actually a string
C0 = pdfarray(color_a),
C1 = pdfarray(color_b),
N = tonumber(n),
}
local s = pdfdictionary {
ShadingType = stype,
ColorSpace = pdfconstant(colorspace),
Function = pdfreference(pdfflushobject(f)),
Coords = pdfarray(coordinates),
Extend = pdfarray { true, true },
}
lpdf.adddocumentshade(name,pdfreference(pdfflushobject(s)))
end
function lpdf.circularshade(name,domain,color_a,color_b,n,colorspace,coordinates)
shade(3,name,domain,color_a,color_b,n,colorspace,coordinates)
end
function lpdf.linearshade(name,domain,color_a,color_b,n,colorspace,coordinates)
shade(2,name,domain,color_a,color_b,n,colorspace,coordinates)
end
function lpdf.colorspec(model,ca,default)
if ca and ca > 0 then
local cv = colors.value(ca)
if cv then
if model == 1 then
model = cv[1]
end
if model == 2 then
return pdfarray { cv[2] }
elseif model == 3 then
return pdfarray { cv[3],cv[4],cv[5] }
elseif model == 4 then
return pdfarray { cv[6],cv[7],cv[8],cv[9] }
elseif model == 5 then
return pdfarray { cv[13] }
end
end
end
if default then
return default
end
end
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