リファレンス · データの入口（自分で用意した地球の地図や軌道データを、ライセンスと出典つきのソースとして渡し、いま画面にあるのは誰のデータかを示します）

`EarthMapSource`型

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。

A source of the Earth's map in tiles for one layer (or every layer of a folder): a TileSource of the family's map shape (the place is a MapPlace, the detail is the pixels across the whole circumference, a tile is an ImageTile) that says which layer it is for. A layer of "*" is every layer of a folder (the place then names the one, in place.layer, and the keys start with its name). The keys a source returns end in level/column/row on the package's pyramid. levels says which levels the source has when that has to be asked (a folder's manifest); left out, levels 3 and 4.

インポート

import type { EarthMapSource } from "@johnmorrisdotca/chikyu-earth/door";

定義

type EarthMapSource = TileSource<EarthMapPlace, number, ImageTile> & {
    layer: MapLayer | "*";
    levels?(layer: string, signal: AbortSignal): TileLayer | undefined | Promise<TileLayer | undefined>;
    grid?: MapGrid;
    holes?: boolean;
    look?: {
        clear: readonly [
            number,
            number
        ];
        gain?: readonly [
            number,
            number,
            number
        ];
    };
};

メンバー

名前	型	説明
`kind`	`"tiles"`
`info`	`SourceInfo`
`need`	`(place: EarthMapPlace, detail: number): readonly string[]`	The keys of the tiles a place needs at a detail. Pure: no fetching.
`load`	`(key: string, signal: AbortSignal): Promise<ImageTile>`	Loads one tile. The source may use the network or not; it must stop when the signal aborts.
`bytes`	`(tile: ImageTile): number`	The tile's size in memory, in bytes, for the budget.
`layer`	`MapLayer \| "*"`
`levels` (省略可)	`((layer: string, signal: AbortSignal) => TileLayer \| undefined \| Promise<TileLayer \| undefined>) \| undefined`
`grid` (省略可)	`MapGrid \| undefined`	The source's own grid, when it is not the package's pyramid (`2^(L+1)` columns by `2^L` rows). The loader places tiles from this. Left out, the pyramid is unchanged.
`holes` (省略可)	`boolean \| undefined`	True when the source's tiles may have transparent pixels (a place it has no data for), so the loader draws them blended and the picture underneath shows through.
`look` (省略可)	`{ clear: readonly [number, number]; gain?: readonly [number, number, number]; } \| undefined`	How the loader draws this source's tiles, on the graphics card: `clear` is the luminance (0 to 255) at or below which a pixel is wholly transparent and from which it is wholly opaque, and `gain` multiplies each colour. Left out, tiles are drawn as they are.

例

import type { EarthMapSource } from "@johnmorrisdotca/chikyu-earth/door";

const layers = (sources: readonly EarthMapSource[]): string[] => sources.map((source) => source.layer);
console.log(layers([]));

[]

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/chikyu-earth 0.51.1 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。

EarthMapSource型

定義

メンバー

例

`EarthMapSource`型