July 2016
Intermediate to advanced
384 pages
10h 11m
Japanese
Content preview from CSSシークレット ―47のテクニックでCSSを自在に操る
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animation‐directionプロパティを思い出しましょう。そこでは 2 つ
の色の間を行き来するために animation‐directionを利用しました
が、今回は単に reverseを指定してアニメーションを反転させます。下
のコードのように、2 つ目のアニメーションを定義しなくても済むように
なります。
これで完成です。余分な要素が必要になるため、この方法が完全だとい
うわけではありません。しかし、かなり複雑なアニメーションが実質数行
のCSSで実現できました。
▶ PLAY!
play.csssecrets.io/circular‐2elements
要素を1つしか使わない解決策
上の解決策はきちんと機能しますが、HTMLに対して変更が必要である
という本質的な問題を抱えています。このテクニックを思いついた時、筆
者は CSS 作業グループ（当時はまだメンバーではありませんでした）の
メーリングリストに投稿し、 1 つの要素に複数の transform‐originを
指定できるようにすることを提案しました。この指定が可能になると、上
のようなアニメーションを 1 つの要素だけで実現できます。ぜひとも要求
するべき事柄だと筆者は考えました。
@keyframesspin{
to{transform:rotate(1turn);}
}
.avatar{
animation:spin3sinfinitelinear;
transform‐origin:
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.