From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/75974 Path: news.gmane.org!not-for-mail From: Hans Hagen Newsgroups: gmane.comp.tex.context Subject: Re: drawarrow and transparency Date: Sat, 05 May 2012 11:19:07 +0200 Message-ID: <4FA4F08B.3000604@wxs.nl> References: <20120502173518.604e1545@sole.extra.cea.fr> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1336209562 5513 80.91.229.3 (5 May 2012 09:19:22 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sat, 5 May 2012 09:19:22 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Sat May 05 11:19:21 2012 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from balder.ntg.nl ([195.12.62.10]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1SQb97-0007Lr-8G for gctc-ntg-context-518@m.gmane.org; Sat, 05 May 2012 11:19:21 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id E1FC2101E7; Sat, 5 May 2012 11:19:19 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with LMTP id yJbAWzjfzMPH; Sat, 5 May 2012 11:19:19 +0200 (CEST) Original-Received: from [127.0.0.1] (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 0FDE5101E2; Sat, 5 May 2012 11:19:18 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 357FA101E2 for ; Sat, 5 May 2012 11:19:16 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with LMTP id CAb9N-d1am2w for ; Sat, 5 May 2012 11:19:15 +0200 (CEST) Original-Received: from filter2-ams.mf.surf.net (filter2-ams.mf.surf.net [192.87.102.70]) by balder.ntg.nl (Postfix) with ESMTP id 52DD0101E1 for ; Sat, 5 May 2012 11:19:15 +0200 (CEST) Original-Received: from smtp.ziggozakelijk.nl (D57D1DA2.static.ziggozakelijk.nl [213.125.29.162]) by filter2-ams.mf.surf.net (8.14.3/8.14.3/Debian-9.4) with ESMTP id q459JB09031077 for ; Sat, 5 May 2012 11:19:12 +0200 X-Default-Received-SPF: pass (skip=loggedin (res=PASS)) x-ip-name=10.100.1.100; Original-Received: from [10.100.1.100] (unverified [10.100.1.100]) by pragma-net.nl (SurgeMail 5.3h2) with ESMTP (TLS) id 1619-1713362 for multiple; Sat, 05 May 2012 11:19:02 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 In-Reply-To: <20120502173518.604e1545@sole.extra.cea.fr> X-Authenticated-User: hagen@controller-9 X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=213.125.29.162; country=NL; region=03; city=Hattem; latitude=52.4724; longitude=6.0696; http://maps.google.com/maps?q=52.4724,6.0696&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0QH69jbEk - d6a730856faf - 20120505 (trained as not-spam) X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.70 X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.12 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: ntg-context-bounces@ntg.nl Errors-To: ntg-context-bounces@ntg.nl Xref: news.gmane.org gmane.comp.tex.context:75974 Archived-At: On 2-5-2012 17:35, Alan BRASLAU wrote: > I have a MetaPost question concerning drawarrow withtransparency > (or any other compound object). > > Is there some clever way to achieve uniform transparency > for a compound object? For example, in the minimal example > below, how can one obtain a transparent arrow without getting > an X-ray vision of the arrowhead? > > \starttext > \startMPpage > drawarrow origin--(1cm,0) withtransparency(1,.5) ; > drawarrow origin--(0,1cm) withtransparency(1,.5) ; > \stopMPpage > \stoptext This is a side effect of an arrow being a composed graphic. I experimented a bit with transparency grouping and after several variants I settled to the following approach: \starttext \startMPpage[offset=1mm] drawarrow (1cm,0cm) -- (0cm,0cm) withcolor red withtransparency(1,.5) ; draw image ( drawarrow (1cm,0cm) -- (0cm,0cm) withcolor red withtransparency(1,.5) ; ) shifted (0,2mm) asgroup "" ; draw image ( drawarrow (1cm,0cm) -- (0cm,0cm) withcolor red withtransparency(1,.5) ; ) shifted (0,4mm) asgroup "isolated" ; draw image ( drawarrow (1cm,0cm) -- (0cm,0cm) withcolor red withtransparency(1,.5) ; ) shifted (0,6mm) asgroup "knockout" ; draw image ( drawarrow (1cm,0cm) -- (0cm,0cm) withcolor red withtransparency(1,.5) ; ) shifted (0,8mm) asgroup "isolated,knockout" ; addbackground withcolor green ; \stopMPpage \stoptext As we have to use xforms (a pitty that this is needed) there is the usual interference and something fishy with clipping is going on. 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 ___________________________________________________________________________________