[luatex] vpack filter question

[Patrick Gundlach]

Hi,

with the document below I get the hboxes correct, but the vboxes seem a bit strange to me. Can someone explain the dimensions of the vbox? Or are they just not calculated yet, so I can't use node.dimensions( <head's glue specs>, vlist) at that time?


Patrick

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\directlua{
function add_box( head,groupcode,size,packtype,direction )
  while head do
    if head.id == 0 then
      if head.list then
        local _w, _h, _d = node.dimensions(head.glue_set, head.glue_sign, head.glue_order, head.list)
        local b = node.new("whatsit","pdf_literal")
        b.data = string.format("0.2 w q 0.5 G 0 \%g \%g \%g re S Q", -_d / 65782 , _w / 65782, ( _h + _d )  / 65782 )
        b.mode = 0
        b.next = head.list
        head.list.prev = b
        head.list = b
        add_box(head.list)
      end
    elseif head.id == 1 then
      if head.list then
        local _w, _h, _d = node.dimensions(head.glue_set, head.glue_sign, head.glue_order, head.list)
        local b = node.new("whatsit","pdf_literal")
        b.data = string.format("0.2 w q 1 0 0 RG 0 \%g \%g \%g re S Q", -_d / 65782 , _w / 65782, ( _h + _d )  / 65782 )
        b.mode = 0
        b.next = head.list
        head.list.prev = b
        head.list = b
        add_box(head.list)
      end
      add_box(head.list)
    end
  head = head.next
  end
  return true
end

callback.register("vpack_filter",add_box)
}

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et mattis posuere, magna nibh scelerisque dolor, non pharetra ligula
mi eu metus. Suspendisse et elit ac tortor porta congue. Fusce
lobortis est sit amet quam. Nam dapibus. Nam sit amet lectus. Lorem
ipsum dolor sit amet, consectetuer adipiscing elit. Curabitur
facilisis congue elit.

\bye
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