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 (head) and n.id==node.id ('glyph') 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. ============================================= local ht,wd,dp = n.height,n.width,n.depth ; local rwd = .5*65536 local k1 = node.new('kern') k1.kern = -wd-.5*rwd local r1 = node.new("rule") r1.width, r1.height, r1.depth = rwd, ht, dp local k2 = node.new('kern') k2.kern = -r1.width local r2 = node.new("rule") r2.width, r2.height, r2.depth = wd+rwd, ht+.5*rwd, -ht+.5*rwd local k3 = node.new('kern') k3.kern = -r2.width local r3 = node.new("rule") r3.width, r3.height, r3.depth = wd+rwd, -dp+.5*rwd, dp+.5*rwd local k4 = node.new('kern') k4.kern = -.5*rwd local r4 = node.new("rule") r4.width, r4.height, r4.depth = rwd, ht, dp local k5 = node.new('kern') k5.kern = -.5*rwd k1.next = r1 r1.prev = k1 r1.next = k2 k2.prev = r1 k2.next = r2 r2.prev = k2 r2.next = k3 k3.prev = r2 k3.next = r3 r3.prev = k3 r3.next = k4 k4.prev = r3 k4.next = r4 r4.prev = k4 r4.next = k5 k5.prev = r4 local box = node.hpack(k1) local tb = node.vpack(box) insert_after (head, n, tb) ============================================= On Thu, Dec 22, 2011 at 6:47 AM, Hans Hagen wrote:

On 21-12-2011 12:16, Zhichu Chen wrote:

...

Hi,

I wrote some CJK vertical typesetting macros in mkii a long time ago and I want to adopt it to mkiv. Sadly the \iftracechinese is gone. Can I still draw boxes of each glyph to see if they are aligned in my way? Drawing a line in the background is so not cool.

mkiv does things completely different

Hans

-----------------------------------------------------------------                                          Hans Hagen | PRAGMA ADE              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com                                             | www.pragma-pod.nl -----------------------------------------------------------------

-- Best Regards Chen

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: ============================================ local function trace_boundingbox (head) 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" node.insert_after (head, n, w) end end end ============================================ On Thu, Dec 29, 2011 at 10:18 PM, Hans Hagen 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 (head) and n.id==node.id ('glyph')

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

-----------------------------------------------------------------                                          Hans Hagen | PRAGMA ADE              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com                                             | www.pragma-pod.nl -----------------------------------------------------------------

-- Best Regards Chen