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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412
18 章 D3 を使った地図の作成
//
境界の色を設定する
var borderColor =
(nbviz.activeCategory === nbviz.ALL_CATS)?
'goldenrod':
nbviz.categoryFill(nbviz.activeCategory);
tooltip.style('border-color', borderColor);
var mouseCoords = d3.mouse(this); #
❶
var w = parseInt(tooltip.style('width')), #
❷
h = parseInt(tooltip.style('height'));
tooltip.style('top', (mouseCoords[1] - h) + 'px'); #
❸
tooltip.style('left', (mouseCoords[0] - w/2) + 'px');
d3.select(this).classed('active', true);
})
❶
D3
の
mouse
メソッドはピクセル単位のマウス座標を返し、この座標を使ってツールチップを配置で
きる。
❷ ツールチップボックスの計算済みの幅と高さを取得する。これは国のタイトルと受賞の文字列が収
まるように調整されている。
❸ マウス座標とツールチップボックスの幅と高さを使い、ボックスを水平方向の中央でマウスカーソ
ルのほぼ上に配置する（幅と高さにはツールチップの ...
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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.