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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397
18.3 D3 の geo、投影法、パス
//...
function ready(error, worldMap...){
//...
nbviz.initMap(worldMap, ...
}
//...
nbviz.initMap = function(world, ...){
var land = topojson.feature(world, world.objects.land),
countries = topojson
.feature(world, world.objects.countries)
.features, #
❷
borders = topojson.mesh(
world, world.objects.countries, function(a, b){
return a !== b; #
❸
});
❶
D3
の
queue
を使って
TopoJSON
フォーマットの地図データを非同期的にロードする。
❷
topojson
を使って
TopoJSON
データから必要なフィーチャを抽出し、
GeoJSON
フォーマットにする。
❸ 国同士が共有する内部境界だけをフィルタリングする。
1
つのジオメトリ（この例では国）だけがアーク
を使っている場合には、
a
と
b
は同じ。
一般に、
D3
での地図表現は標準パターンに従います。まず、
D3
の多種多様な選択肢の
1
つを
使って
D3
の
projection
を作成します。そして、この
projection
を使って
path
を作成します。
次に、この
path
を使って ...
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