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if not modules then modules = { } end modules ['lpdf-epa'] = {
version = 1.001,
comment = "companion to lpdf-epa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is a rather experimental feature and the code will probably
-- change.
local type, tonumber = type, tonumber
local format = string.format
local trace_links = false trackers.register("figures.links", function(v) trace_links = v end)
local report_link = logs.new("links")
local backends, lpdf = backends, lpdf
local variables = interfaces.variables
local codeinjections = backends.pdf.codeinjections
local function add_link(x,y,w,h,destination,what)
if trace_links then
report_link("dx: %04i, dy: %04i, wd: %04i, ht: %04i, destination: %s, type: %s",x,y,w,h,destination,what)
end
context.setlayer (
{ "epdflinks" },
{ x = x .. "bp", y = y .. "bp", preset = "leftbottom" },
function()
-- context.blackrule { width = w.."bp", height = h.."bp", depth = "0bp" }
context.button (
{
width = w.."bp",
height = h.."bp",
offset = variables.overlay,
frame = trace_links and variables.on or variables.off,
},
"",
{ destination }
)
end
)
end
local function link_goto(x,y,w,h,document,annotation,pagesdata,pagedata,namespace)
-- print("border",table.unpack(annotation.Border.all))
-- print("flags",annotation.F)
-- print("pagenumbers",pagedata.reference.num,destination[1].num)
-- print("pagerefs",pagedata.number,pagesdata.references[destination[1].num])
local destination = annotation.A.D -- [ 18 0 R /Fit ]
local what = "page"
if type(destination) == "string" then
local destinations = document.Catalog.Destinations
local wanted = destinations[destination]
destination = wanted and wanted.D
if destination then what = "named" end
end
local whereto = destination and destination[1] -- array
if whereto and whereto.num then
local currentpage = pagedata.number
local destinationpage = pagesdata.references[whereto.num]
add_link(x,y,w,h,namespace .. destinationpage,what)
return
end
end
local function link_uri(x,y,w,h,document,annotation)
local url = annotation.A.URI
if url then
add_link(x,y,w,h,format("url(%s)",url),"url")
end
end
local function link_file(x,y,w,h,document,annotation)
local filename = annotation.A.F
if filename then
local destination = annotation.A.D
if not destination then
add_link(x,y,w,h,format("file(%s)",filename),"file")
elseif type(destination) == "string" then
add_link(x,y,w,h,format("%s::%s",filename,destination),"file (named)")
else
destination = destination[1] -- array
if tonumber(destination) then
add_link(x,y,w,h,format("%s::page(%s)",filename,destination),"file (page)")
else
add_link(x,y,w,h,format("file(%s)",filename),"file")
end
end
end
end
function codeinjections.mergereferences(specification)
if figures and not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.load(fullname)
if document then
local pagenumber = specification.page or 1
local xscale = specification.yscale or 1
local yscale = specification.yscale or 1
local size = specification.size or "crop" -- todo
local pagesdata = document.Catalog.Pages
local pagedata = pagesdata[pagenumber]
local annotations = pagedata.Annots
local namespace = format("lpdf-epa-%s-",file.removesuffix(file.basename(fullname)))
local reference = namespace .. pagenumber
if annotations.size > 0 then
local llx, lly, urx, ury = table.unpack(pagedata.MediaBox.all)
local width, height = xscale * (urx - llx), yscale * (ury - lly) -- \\overlaywidth, \\overlayheight
context.definelayer( { "epdflinks" }, { height = height.."bp" , width = width.."bp" })
for i=1,annotations.size do
local annotation = annotations[i]
local subtype = annotation.Subtype
local a_llx, a_lly, a_urx, a_ury = table.unpack(annotation.Rect.all)
local x, y = xscale * (a_llx - llx), yscale * (a_lly - lly)
local w, h = xscale * (a_urx - a_llx), yscale * (a_ury - a_lly)
if subtype == "Link" then
local linktype = annotation.A.S
if linktype == "GoTo" then
link_goto(x,y,w,h,document,annotation,pagesdata,pagedata,namespace)
elseif linktype == "GoToR" then
link_file(x,y,w,h,document,annotation)
elseif linktype == "URI" then
link_uri(x,y,w,h,document,annotation)
elseif trace_links then
report_link("unsupported link annotation '%s'",linktype)
end
elseif trace_links then
report_link("unsupported annotation '%s'",subtype)
end
end
context.flushlayer { "epdflinks" }
context("\\gdef\\figurereference{%s}",reference) -- global
specification.reference = reference
return namespace
end
end
end
return ""-- no namespace, empty, not nil
end
function codeinjections.mergeviewerlayers(specification)
if not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.load(fullname)
if document then
local pagenumber = specification.page or 1
local pagesdata = document.Catalog.Pages
local pagedata = pagesdata[pagenumber]
local resources = pagedata.Resources
--~ table.print(resources)
--~ local properties = resources.Properties
end
end
end
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