Файл:Tireless Contributor Barnstar.gif
Tireless_Contributor_Barnstar.gif (120 × 120 пкс, размер файла: 96 Кб, MIME-тип: image/gif, закольцованный, 18 фреймов, 0,9 с)
Описание
Описание | 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: [1] Barnstar v2.0: [2]. 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 https://wikimedia.org/api/rest_v1/media/math/render/svg/944b353b7d1e03c503b796ea3e5508f2d2210252" style="vertical-align: -0.838ex; width:4.664ex; height:2.843ex;"/> means the image of the barnstar rotated through angle <img alt="{\displaystyle B(\theta )}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6e5ab2664b422d53eb0c7df3b87e1360d75ad9af" style="vertical-align: -0.338ex; width:1.09ex; height:2.176ex;"/> <img alt="{\displaystyle \theta }" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src=" then image https://wikimedia.org/api/rest_v1/media/math/render/svg/944b353b7d1e03c503b796ea3e5508f2d2210252" style="vertical-align: -0.838ex; width:4.664ex; height:2.843ex;"/> will look similar but not quite identical to <img alt="{\displaystyle B(\theta )}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/3bc960dd6efa053073808e1ef1bde962237dcbae" style="vertical-align: -0.838ex; width:11.044ex; height:2.843ex;"/> where <img alt="{\displaystyle B(\theta +n\theta _{0})}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a601995d55609f2d9f5e233e36fbe9ea26011b3b" style="vertical-align: -0.338ex; width:1.395ex; height:1.676ex;"/> is an integer, and <img alt="{\displaystyle n}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src=" <img alt="{\displaystyle \theta _{0 |
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Другие версии файла | — |
" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/18b67de6bf25dba7a24e66967ff6319858798734" style="vertical-align: -0.671ex; width:2.145ex; height:2.509ex;"/> = 72° (i.e. the angle of rotation corresponding to the approximate rotational symmetry).
Exploiting this, for a number of values of https://wikimedia.org/api/rest_v1/media/math/render/svg/6e5ab2664b422d53eb0c7df3b87e1360d75ad9af" style="vertical-align: -0.338ex; width:1.09ex; height:2.176ex;"/> in the range <img alt="{\displaystyle \theta }" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/01c11106464d33942ab0159e7728716b91fa2423" style="vertical-align: -0.671ex; width:12.403ex; height:2.509ex;"/>, an image is generated consisting of a linear combination of (up to) three similar images, given by: <img alt="{\displaystyle 0<=\theta <\theta _{0}}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="
https://wikimedia.org/api/rest_v1/media/math/render/svg/0b29d949a3e8604efda43f32e7ea98fb06acb917" style="vertical-align: -1.838ex; width:39.975ex; height:5.176ex;"/> where <img alt="{\displaystyle {\frac {1-x}{2}}B(\theta +\theta _{0})+{\frac {1}{2}}B(\theta )+{\frac {x}{2}}B(\theta -\theta _{0})}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2153d0b87fba9f74f772c9c5d7968bf34c8af435" style="vertical-align: -2.338ex; width:7.409ex; height:5.843ex;"/> <img alt="{\displaystyle x={\frac {\theta }{\theta _{0}}}}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="
The key thing about this is that not only does this fade gradually between the images as https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;"/> changes (as the coefficients are linear in <img alt="{\displaystyle x}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;"/>), but it also joins up properly when the animation restarts. You see this because the expression evaluates to the same thing for both <img alt="{\displaystyle x}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2a7bc6e34b53e0e8a8815159c356b1acccf7ea24" style="vertical-align: -0.338ex; width:5.351ex; height:2.176ex;"/> and <img alt="{\displaystyle \theta =0}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6092e68904d0c31801bee667fd2b3ebd40d6e5e4" style="vertical-align: -0.671ex; width:6.334ex; height:2.509ex;"/> - in fact <img alt="{\displaystyle \theta =\theta _{0}}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a65723065f5cd7ddc78dde173bea54ff7e94c507" style="vertical-align: -1.838ex; width:17.102ex; height:5.176ex;"/> <img alt="{\displaystyle {\frac {1}{2}}(B(\theta _{0})+B(0))}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="
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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| время создания = | автор = Trainspotter at English Wikipedia — Лицензия: CC BY-SA 3.0 (Creative Commons Attribution-Share Alike 3.0) http://creativecommons.org/licenses/by-sa/3.0/ }} Источник файла — сайт Wikimedia Commons, куда он был загружен под одной из свободных лицензий ( https://commons.wikimedia.org/wiki/File:Tireless_Contributor_Barnstar.gif ). Авторов, работавших над этим файлом см. в истории файла: https://commons.wikimedia.org/w/index.php?title=File:Tireless_Contributor_Barnstar.gif&action=history
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текущий | 19:50, 14 февраля 2024 | 120 × 120 (96 Кб) | Я, робот (обсуждение | вклад) | == Описание == {{Изображение | описание = The Tireless Contributor Barnstar may be awarded to especially tireless Wikipedians that contribute an especially large body of work without sacrificing quality. <h2><span class="mw-headline" id="History">History</span></h2> <div style="direction:ltr;"> <p>This barnstar was introduced by [https://en.wikipedia.org/wiki/User:Trainspotter en:User:Trainspotter] on 2004-10-26. </p><p>This banner has been used for the first acknowledgement of an immense go... |
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