File:Tireless Contributor Barnstar.gif
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Tireless_Contributor_Barnstar.gif (120 × 120 pixels, taille du fichier : 96 kio, type MIME : image/gif, en boucle, 18 trames, 0,9 s)
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Description[modifier]
DescriptionTireless Contributor Barnstar.gif |
English: The Tireless Contributor Barnstar may be awarded to especially tireless Wikipedians that contribute an especially large body of work without sacrificing quality.
HistoryThis barnstar was introduced by en:User:Trainspotter on 2004-10-26. This banner has been used for the first acknowledgement of an immense good work on the very new Czech Wikisource and has been granted to the very good and tireless user Brambůrka which I want to see her very often there. -jkb- 22:41, 24 April 2006 (UTC) How this picture worksThis picture is taken from the original barnstar: Barnstar v2.0: . If you look at the frames of the animation, you will see that actually it only rotates through one fifth of a revolution before the animation restarts - this is to reduce file size. But the original barnstar has only approximate rotational symmetry, so you would expect a nasty discontinuous jump when it the animation restarts. Here is the technique that was used to give a smooth transition between the end and the start of the animation. Each frame of the animation is a linear combination (merging) of three copies of the Barnstar image with different angles of rotation. If means the image of the barnstar rotated through angle then image will look similar but not quite identical to where is an integer, and = 72° (i.e. the angle of rotation corresponding to the approximate rotational symmetry). Exploiting this, for a number of values of in the range , an image is generated consisting of a linear combination of (up to) three similar images, given by: where The key thing about this is that not only does this fade gradually between the images as changes (as the coefficients are linear in ), but it also joins up properly when the animation restarts. You see this because the expression evaluates to the same thing for both and - in fact I didn't keep the code unfortunately. But the above info is enough to allow someone reasonably competent to reproduce the basic algorithm. Trainspotter again (talk) 19:57, 11 November 2009 (UTC) |
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Auteur | Trainspotter sur Wikipédia anglais |
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Ce fichier est disponible selon les termes de la licence Creative Commons Attribution – Partage dans les Mêmes Conditions 3.0 (non transposée). Sujet aux avertissements. | ||
Attribution: Trainspotter de en.wikipedia.org | ||
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Ce bandeau de licence a été ajouté à ce fichier dans le cadre de la procédure de mise à jour des licences des images sous GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Vous avez la permission de copier, distribuer et modifier ce document selon les termes de la GNU Free Documentation License version 1.2 ou toute version ultérieure publiée par la Free Software Foundation, sans sections inaltérables, sans texte de première page de couverture et sans texte de dernière page de couverture. Un exemplaire de la licence est inclus dans la section intitulée GNU Free Documentation License. Sujet aux avertissements.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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Date et heure | Vignette | Dimensions | Utilisateur | Commentaire | |
---|---|---|---|---|---|
actuel | 5 avril 2008 à 22:01 | 120 × 120 (96 kio) | とある白い猫 (d | contributions) | The Tireless Contributor Barnstar may be awarded to especially tireless Wikipedians that contribute an especially large body of work without sacrificing quality. This barnstar was introduced by en:User:Trainspotter on 2004-10-26. This banner has be |
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