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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369
16.10 軸とラベル
16.10
軸とラベル
更新パターンが得られたので、誇りある棒グラフに必要な軸と軸ラベルを追加します。
D3
は高水準のグラフ要素をあまり提供していないこともあり、自分で作ることを勧めていま
す。しかし、便利な
axis
オブジェクトがあるので、
SVG
要素を自分で作成する必要はありませ
ん。使い方は簡単で、想像どおり、データ更新パターンとも相性が良いので、表示するデータに対
応して軸の目盛りやラベルを変更することができます。■
†
† 軸は
Mike Bostock
が「
Towards Reusable Charts
」（
https://bost.ocks.org/mike/chart/
）で提唱したものに似たパターン
に従っています。
JavaScript
オブジェクトの
call
（
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/
Global_Objects/Function/call
）メソッドを使って選択した
DOM
要素に基づいた
HTML
を作成します。
D3
の軸
D3
の軸は最初はわかりにくく、魔法のように感じるかもしれません。
D3
の軸は、正しい
軸
HTML
（線、目盛り、目盛りラベルなど）を生成し、データの変更に適切に対応できるプ
ラグイン
†
と考えるのが最善です（つまり、スケールの範囲を変更したら、それに応じてかな
り見栄えがよく見える適切で滑らかな遷移を使って軸を変更します）。
D3
の軸では一般的に、軸を保持する ...
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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.