* mlib plugin question @ 2011-08-10 18:00 Peter Rolf 2011-08-14 17:47 ` Hans Hagen 2011-08-15 13:26 ` Peter Rolf 0 siblings, 2 replies; 4+ messages in thread From: Peter Rolf @ 2011-08-10 18:00 UTC (permalink / raw) To: mailing list for ConTeXt users Hi, I use a mlib plugin to manually start/stop transparency. All graphics in between will be drawn with the defined state. Not very useful in general, but I need it for some graphics in Aero. This is the simple code.. MP side: def btransp(expr a, t) = draw origin withprescript "mtr_transp=start" withprescript "mtr_alternative=" & decimal a withprescript "mtr_transparency=" & decimal t ; enddef ; def etransp = draw origin withprescript "mtr_transp=stop" ; enddef ; TEX side: local function mtr_process(object,prescript,before,after) local mtr_alternative = prescript.mtr_alternative if prescript.mtr_transp == "start" then if mtr_alternative then mtr_alternative = tonumber(mtr_alternative) local mtr_transparency = tonumber(prescript.mtr_transparency) before[#before+1] = format("q /Tr%s gs %% mtr",registertransparency(nil,mtr_alternative,mtr_transparency,true)) end elseif prescript.mtr_transp == "stop" then after[#after+1] = "Q % mtr" else -- fatal error end -- object.path = true -- 'true' gives runtime error, 'false' distorts content object.grouped = true object.type = false -- don't draw object.color = false end Usage: btransp(normaltransparency,.5); <whatever> etransp; This works so far (no visible artefacts), but part of the 'draw origin' is (although not drawn) still existent in the code. [..] q /Tr1 gs % mtr 10.000000 M % unwanted setup for 'origin' 1 j 1 J 0.500000 w 0.000000 0.000000 m 0.000000 0.000000 l <whatever> 10.000000 M % unwanted setup for 'origin' 1 j 1 J 0.500000 w 0.000000 0.000000 m 0.000000 0.000000 l Q % mtr [..] I had a solution for the old 'specials', but I can't find one for the plugin handler. How can I get rid of the 'trigger code'? Peter ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: mlib plugin question 2011-08-10 18:00 mlib plugin question Peter Rolf @ 2011-08-14 17:47 ` Hans Hagen 2011-08-15 9:37 ` Peter Rolf 2011-08-15 13:26 ` Peter Rolf 1 sibling, 1 reply; 4+ messages in thread From: Hans Hagen @ 2011-08-14 17:47 UTC (permalink / raw) To: mailing list for ConTeXt users On 10-8-2011 8:00, Peter Rolf wrote: > Usage: > > btransp(normaltransparency,.5); > <whatever> > etransp; Officially draw image ( whatever ) withtransparency (normaltransparency,.5) should work, but there is a (known) bug in mplib with respect to applying scripts to the components of a picture (color works ok). > I had a solution for the old 'specials', but I can't find one for the > plugin handler. How can I get rid of the 'trigger code'? In this respect the converter is kind of black box and there is not something like a stack or disable options. Maybe some day but I'd rather not touch the code now. 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 ----------------------------------------------------------------- ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: mlib plugin question 2011-08-14 17:47 ` Hans Hagen @ 2011-08-15 9:37 ` Peter Rolf 0 siblings, 0 replies; 4+ messages in thread From: Peter Rolf @ 2011-08-15 9:37 UTC (permalink / raw) To: mailing list for ConTeXt users, Hans Hagen Am 14.08.2011 19:47, schrieb Hans Hagen: > On 10-8-2011 8:00, Peter Rolf wrote: > >> Usage: >> >> btransp(normaltransparency,.5); >> <whatever> >> etransp; > > Officially > > draw image ( whatever ) withtransparency (normaltransparency,.5) > > should work, but there is a (known) bug in mplib with respect to > applying scripts to the components of a picture (color works ok). > The problem with the current transparency implementation is, that it doesn't use a transparency stack. If you use nested transparency, switching back to non transparent (/Tr0) is not what you always want. That's the only reason for this extra (ugly) plugin. >> I had a solution for the old 'specials', but I can't find one for the >> plugin handler. How can I get rid of the 'trigger code'? > > In this respect the converter is kind of black box and there is not > something like a stack or disable options. Maybe some day but I'd rather > not touch the code now. > OK. I think I found a solution in the meantime (but still to be tested). Thanks for taking the time. Peter ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: mlib plugin question 2011-08-10 18:00 mlib plugin question Peter Rolf 2011-08-14 17:47 ` Hans Hagen @ 2011-08-15 13:26 ` Peter Rolf 1 sibling, 0 replies; 4+ messages in thread From: Peter Rolf @ 2011-08-15 13:26 UTC (permalink / raw) To: mailing list for ConTeXt users Just for the records (or for the masses of mlib plugin programmers/lovers out there)... ;-) Am 10.08.2011 20:00, schrieb Peter Rolf: > Hi, > > I use a mlib plugin to manually start/stop transparency. All graphics > in between will be drawn with the defined state. Not very useful in > general, but I need it for some graphics in Aero. > > This is the simple code.. > > MP side: > > def btransp(expr a, t) = > draw origin withprescript "mtr_transp=start" > withprescript "mtr_alternative=" & decimal a > withprescript "mtr_transparency=" & decimal t ; > enddef ; > > def etransp = > draw origin withprescript "mtr_transp=stop" ; > enddef ; > > > TEX side: > > local function mtr_process(object,prescript,before,after) > local mtr_alternative = prescript.mtr_alternative > if prescript.mtr_transp == "start" then > if mtr_alternative then > mtr_alternative = tonumber(mtr_alternative) > local mtr_transparency = tonumber(prescript.mtr_transparency) > before[#before+1] = format("q /Tr%s gs %% > mtr",registertransparency(nil,mtr_alternative,mtr_transparency,true)) > end > elseif prescript.mtr_transp == "stop" then > after[#after+1] = "Q % mtr" > else > -- fatal error > end > -- object.path = true -- 'true' gives runtime error, 'false' distorts > content > object.grouped = true > object.type = false -- don't draw > object.color = false > end > local function mtr_process(object,prescript,before,after) local mtr_alternative = prescript.mtr_alternative if prescript.mtr_transp == "start" then if mtr_alternative then mtr_alternative = tonumber(mtr_alternative) local mtr_transparency = tonumber(prescript.mtr_transparency) before[#before+1] = format("q /Tr%s gs %% mtr",registertransparency(nil,mtr_alternative,mtr_transparency,true)) end elseif prescript.mtr_transp == "stop" then after[#after+1] = "Q % mtr" else -- fatal error end -- get rid of the 'draw <whatever> ...' trigger code object.type = "mtr-plugin" -- don't use an existing type object.path = false -- ignore path from 'draw <whatever>' trigger code object.grouped = false -- no additional 'miterlimit, linejoin, linecap' for grouping object.miterlimit, object.linejoin, object.linecap = -1,-1,-1 -- use default values, so a setting is unnecessary object.pen = false -- don't set pen line width object.color = false end > Usage: > > btransp(normaltransparency,.5); > <whatever> > etransp; > > > This works so far (no visible artefacts), but part of the 'draw origin' > is (although not drawn) still existent in the code. > > [..] > q /Tr1 gs % mtr > 10.000000 M % unwanted setup for 'origin' > 1 j > 1 J > 0.500000 w > 0.000000 0.000000 m > 0.000000 0.000000 l > > <whatever> > > 10.000000 M % unwanted setup for 'origin' > 1 j > 1 J > 0.500000 w > 0.000000 0.000000 m > 0.000000 0.000000 l > Q % mtr > [..] > > I had a solution for the old 'specials', but I can't find one for the > plugin handler. How can I get rid of the 'trigger code'? > > > Peter > ___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to the Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://tex.aanhet.net > archive : http://foundry.supelec.fr/projects/contextrev/ > wiki : http://contextgarden.net > ___________________________________________________________________________________ > ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
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