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if not modules then modules = { } end modules ['grph-pat'] = {
version = 1.001,
comment = "companion to grph-pat.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is just a proof of concept. Viewers behave different (offsets) and Acrobat doesn't
-- show xform based patterns.
--
-- This module will be cleaned up and use codeinjections and such.
local texsetbox = tex.setbox
local texgetbox = tex.getbox
local nodepool = nodes.pool
local new_literal = nodepool.originliteral -- really ?
local new_hlist = nodepool.hlist
local names = { }
interfaces.implement {
name = "registerpattern",
arguments = { {
{ "name" },
{ "number", "integer" },
{ "width", "dimension" },
{ "height", "dimension" },
{ "hoffset", "dimension" },
{ "voffset", "dimension" },
} },
actions = function(specification)
local number = specification.number
local name = specification.name
local box = texgetbox(number)
if not name or name == "" then
return
end
nodes.handlers.finalizebox(number)
names[name] = lpdf.registerpattern {
number = number,
width = specification.width or box.width,
height = specification.height or (box.height + box.depth) ,
hoffset = specification.hoffset,
voffset = specification.voffset,
}
end
}
interfaces.implement {
name = "applypattern",
arguments = { {
{ "name" },
{ "number", "integer" },
{ "width", "dimension" },
{ "height", "dimension" },
} },
actions = function(specification)
local number = specification.number
local name = specification.name
local width = specification.width
local height = specification.height
if not name or name == "" then
return
end
local p = names[name]
if p then
local l = new_literal(lpdf.patternstream(p,width,height))
local h = new_hlist(l,width,height)
texsetbox(number,h)
end
end
}
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