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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345
16
章
D3
入門
−
棒グラフ
15
章では、ノーベル賞可視化を構成要素に分割しました。本章では、必要となる棒グラフ（図
16-1
）の作成を通して
D3
をていねいに紹介していきます。
■
D3
はグラフ作成ライブラリの枠を超えたものです。
D3
は、これはグラフ作成以上のことにも
使います。それなのに、なぜ私はここでごく平凡な棒グラフの作成に
D3
を使うのでしょうか。ま
ず第一に、初めてゼロから棒グラフを作成するという作業はワクワクするものだからです。グラフ
のルック＆フィールを完全に制御でき、特定のグラフ作成ライブラリが持つあらゆる先入観の制
約を受けないからです。さらに、
D3
の基本要素（特にデータバインディングと
enter-exit-remove
更新パターン）を紹介できる絶好の機会だからです。この基本をマスターすれば、
D3
が提供する
すべての機能と表現力を着実に利用し、棒グラフを超えた斬新なグラフを作成していくことができ
ます。
4
章で説明した
Web
開発テクニック（特に、
D3
が得意の
SVG
グラフィックス）を使っていき
ます（「
4.7
SVG
」を参照）。素晴らしい専用の
D3
サイト
blockbuilder.org
を使ってコードを試
してみることをお勧めします。
棒グラフの作成を始める前に、棒グラフの要素を考えてみましょう。
図
16-1
本章で目標とする棒グラフ
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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.