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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知っておくべきポイント
CSSグラデーション、基本的なSVG、CSSアニメーション、 P.78の
「ストライプ模様の背景」、 P.114の「さまざまな楕円形」
課題
集計結果の表示からプログレスインジケーターやタイマーに至るまで、
円グラフはとても多くの用途に使われています。しかし、従来の Web テ
クノロジーでは最もシンプルな2 色の円グラフでさえ作成は面倒でした。
円グラフを表示するには、値を表す扇形を1 つずつあらかじめ用意する
か、はるかに複雑なグラフにも対応したJavaScriptライブラリに頼るのが
一般的です。
グラフの作成は以前ほど困難ではなくなりましたが、 1 行ですべてをシ
ンプルに記述できるようなライブラリはまだありません。一方、今日では
保守も容易なよりよい方法が複数考えられています。
トランスフォームを使った解決策
マークアップのシンプルさという観点からは、この解決策が最善です。
必要な要素は 1 つだけで、擬似要素とトランスフォームそして CSS グラ
デーションを使ってグラフが表現されます。まず、次のように要素を 1 つ
記述しましょう。
シンプルな円グラフ
14
148
3章：形状
ここでは、 20 ％の割合がハードコードされた円グラフを作成します。
より柔軟なグラフについては、後ほ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.