# [NTG-context] Is there a replacement for \tracechinesetrue in mkiv?

Zhichu Chen zhichu.chen at gmail.com
Fri Dec 30 16:52:31 CET 2011

Well, that's just perfect, only it's not what I'm looking for :( What
I need is a fully customable way to debug some of my inputs rather
than everything as a font feature.

I found a "cleaner" way now: to use the "whatsit" node, I hope it's
useful for someone so I paste the function here:

============================================
for n in node.traverse (head) do
if n.id == node.id ('glyph') then
local ht,wd,dp = n.height,n.width,n.depth
local htsp,wdsp,dpsp = ht/65536,wd/65536,dp/65536
local w = node.new("whatsit","pdf_literal")
w.data = "q 1 0 1 RG 1 0 1 rg 0.1 w 0 " .. -dpsp .. " m 0 "
.. htsp .. " l " .. -wdsp .. " " .. htsp .. " l " .. -wdsp .. " " ..
-dpsp .. " l s  0 1 0 RG 0 1 0 rg 0.1 w [2 1] 0 d 0 0 m " .. -wdsp ..
" 0 l S Q"
end
end
end
============================================

On Thu, Dec 29, 2011 at 10:18 PM, Hans Hagen <pragma at wxs.nl> wrote:
> On 29-12-2011 04:22, Zhichu Chen wrote:
>>
>> All right, after some readings, I came out with a node solution. The
>> major idea is listed below and works just fine. "n" from node_traverse
>>
>> My question is: is there a better way? Because these codes are so
>> dirty. I prefer mplib but I have no clue how to do that.
>
>
> Using mp would be pretty complex too and all solutions are rather
> inefficient (bloat the pdf) .. attached another solution (I'll add it to the
> next beta).
>
>
> Hans
>
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--
Best Regards
Chen