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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355
16.5 D3 のスケールを使った範囲の調整
最大限利用します。
16.5
D3
のスケールを使った範囲の調整
D3
のスケールの背景にある基本的な考え方は、入力領域から出力範囲へのマッピングです。ス
ケールは簡単に使うことができ、グラフの作成や可視化などで発生する手間のかかる多くの作業が
軽減できます。スケールを使いこなせるようになればなるど、スケールの適用できる場面も増える
でしょう。スケールをマスターすることは、
D3
をストレスなく扱うために必要です。
D3
で提供している多くのスケールは、大きく
3
つに分類できます。定量的スケール、序数ス
ケール、時間スケール
†
です。考えうるほとんどの状況に適した魅力的なマッピングが用意されて
いますが、線形スケールや序数スケールを使う場合が多いでしょう。
D3
スケールはオブジェクトでもあり関数でもあるので、使用するときに違和感を感じるかもし
れません。つまり、スケールを作成したら、スケールでさまざまなメソッドを呼び出してプロパ
ティ（例えば、定義域を設定する
domain
）を設定しますが、定義域引数を指定して関数として呼
び出して範囲値を返すこともできます。以下の例でこの違いが明確になるでしょう。
var scale = d3.scale.linear(); //
線形スケールを作成する
scale.domain([0, 1]).range([0, 100]); #
❶
scale(0.5) // returns 50 #
❷
❶ スケールの
domain
と
range
メソッドを使って ...
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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.