`markerTracks`関数

リファレンスの説明と例は英語です。見出しと目次は日本語です。

The groups to join, each in date order, from the markers a range let through. A group with fewer than two dated markers has nothing to join. Markers with the same moment keep the order given.

インポート

import { markerTracks } from "@johnmorrisdotca/hoshi-stars/chart";

定義

function markerTracks(visible: readonly VisibleMarker[], tracks: boolean | readonly string[] | undefined): MarkerTrack[]

引数

名前	型	説明
`visible`	`readonly VisibleMarker[]`	What `visibleMarkers` returned.
`tracks`	`boolean \| readonly string[] \| undefined`	`true` joins every group (markers with no `group` are one group, named `""`); a list of names joins those groups; `false` or nothing joins none.

戻り値

MarkerTrack[]

The tracks, in the order their groups first appear.

例

import { markerTracks, visibleMarkers } from "@johnmorrisdotca/hoshi-stars/chart";

const comet = [
  { ra: 10, dec: 5, date: "2026-11-03", group: "Comet" },
  { ra: 8, dec: 4, date: "2026-11-01", group: "Comet" },
  { ra: 40, dec: 20, date: "2026-11-02", group: "Log" },
];
console.log(markerTracks(visibleMarkers(comet), ["Comet"]).map((t) => t.items.map((i) => i.id)));
// [ [ 'm1', 'm0' ] ]

[ [ 'm1', 'm0' ] ]

出力（このページを作ったときに実行した結果）

ソースを見る GitHub で編集@johnmorrisdotca/hoshi-stars 0.47.0 のソースから作成しました。

この日本語は、まだ日本語を母語とする方の確認を受けていません。訂正を歓迎します。

markerTracks関数

定義

引数

戻り値

例

`markerTracks`関数