August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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354
16 章 D3 入門
−
棒グラフ
x
と
y
座標を使って親グループ内に直接配置する
SVG
要素では、
insert
は冗長に思えるかもし
れません。しかし、「
4.7.10
階層化と透明度」で説明したように、
SVG
では要素が階層化されて
います。
DOM
ツリーの最後の要素が以前の要素に重ね合されるので、
DOM
の順序が重要です。
この例は、
18
章で世界地図のグリッドオーバーレイ（
graticule
）を使うときに説明します。この
グリッドを他のすべての地図要素の上に描画したいので、
insert
を使って地図要素をグリッドの
前に配置します。
図
16-9
のシンプルな棒グラフは、多少の改良を切に必要としています。これをどのように改良
できるか調べてみましょう。まずは
D3
の強力な
scale
オブジェクトを説明し、次に
D3
で最も重
要な概念であるデータバインディングを取り上げます。
16.4
D3
の利用
例
16-2
では、
D3
を使って基本的なシンプルな棒グラフを作成しました。このグラフにはいく
つかの問題がありました。まず、データ配列をループで処理するのはあまりスマートとは言えませ
ん。データセットをグラフにしたい場合はどうなるでしょうか。棒の追加や削除を行い、その結果
の棒を新しいデータで更新してすべてを再描画する方法が必要です。また、さまざまな数の棒や棒
の異なる最大値を反映するように
x
と
y
方向の棒サイズのスケーリングを保つ必要もあります。
これだけでも既にかなり多くの管理作業があり、瞬く間に面倒な事態になってしまうでしょう。さ
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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.