From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/75069 Path: news.gmane.org!not-for-mail From: Aditya Mahajan Newsgroups: gmane.comp.tex.context Subject: Re: random background picture in metafun Date: Tue, 13 Mar 2012 14:00:57 -0400 (EDT) Message-ID: References: <4F5F5DA1.1050202@uni-bonn.de> <4F5F76CC.1090800@gmx.net> 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 1331661643 10864 80.91.229.3 (13 Mar 2012 18:00:43 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 13 Mar 2012 18:00:43 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Tue Mar 13 19:00:43 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 1S7W1Z-0002k2-GW for gctc-ntg-context-518@m.gmane.org; Tue, 13 Mar 2012 19:00:41 +0100 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id CC8DACB2A2; Tue, 13 Mar 2012 19:00:40 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id ZZsvkdAKyusG; Tue, 13 Mar 2012 19:00:35 +0100 (CET) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 266D8CB291; Tue, 13 Mar 2012 19:00:35 +0100 (CET) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 4B53ACB291 for ; Tue, 13 Mar 2012 19:00:34 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id ANYArN2IVSSC for ; Tue, 13 Mar 2012 19:00:19 +0100 (CET) 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 29561CB04D for ; Tue, 13 Mar 2012 19:00:18 +0100 (CET) Original-Received: from hackers.mr.itd.umich.edu (smtp.mail.umich.edu [141.211.14.81]) by filter2-ams.mf.surf.net (8.14.3/8.14.3/Debian-9.4) with ESMTP id q2DI0Cbh003709 for ; Tue, 13 Mar 2012 19:00:13 +0100 Original-Received: FROM LP533.ECE.McGill.CA (Mismatch [132.206.69.142]) By hackers.mr.itd.umich.edu ID 4F5F8B2B.3AB81.874 ; Authuser adityam; 13 Mar 2012 14:00:11 EDT In-Reply-To: <4F5F76CC.1090800@gmx.net> User-Agent: Alpine 2.02 (LNX 1266 2009-07-14) X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=141.211.14.81; country=US; region=MI; city=Ann Arbor; postalcode=48109; latitude=42.2923; longitude=-83.7145; metrocode=505; areacode=734; http://maps.google.com/maps?q=42.2923,-83.7145&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0QGJ60c4s - 42b25256ee87 - 20120313 (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:75069 Archived-At: On Tue, 13 Mar 2012, Peter Rolf wrote: > Am 13.03.2012 15:45, schrieb Thomas A. Schmitz: >> Hi all, >> >> scenario: for a presentation, I want the background to be a random >> picture, taken from a directory "backgroundpics." The pictures are >> numbered consecutively as 1.jpg through 22.jpg. For some complex >> reasons, it would be easier for me to include these pictures via metafun >> (I want to add other graphical elements on top). So my question is, how >> can I pick a random picture? Given the code >> >> StartPage ; >> draw externalfigure "backgoundpics/1" xscaled PaperWidth yscaled >> PaperHeight ; >> StopPage ; >> >> how can I obtain a random number and make metapost pick the >> corresponding picture? Sorry, difficult to make a minimal example here... >> > (slightly tested) > > string mypath, rndfile; > > mypath:= "backgroundpics/"; > nofpics:= 22; > > n:= round(uniformdeviate(nofpics-1)+1); Actually, round (uniformdeviate(nopics-1)) does not give equal weightage to 1 and nofpics. A better solution is n:= floor(uniformdeviate(nofpics)) + 1; which gives a uniform weight to all numbers. > rndfile:= mypath & decimal n; Aditya ___________________________________________________________________________________ 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 ___________________________________________________________________________________