TileSystem

TileSystem is a tile-system utility class that describes the tile X/Y axis index direction and the world projection origin. It does not extend any base class. It is used by TileLayer or GroupTileLayer through options.tileSystem, where you can pass a built-in preset name or a [sx, sy, ox, oy] tuple.

import { TileSystem } from "maptalks";

const ts = new TileSystem([1, -1, -20037508.34, 20037508.34]);

Constructor

new TileSystem(sx, sy, ox, oy)
new TileSystem([sx, sy, ox, oy])

Parameters:

• sx Number|Number[] X-axis tile index direction (1 means right is larger, -1 the reverse); when an array is passed it is [sx, sy, ox, oy].
• sy Number Y-axis tile index direction (1 means bottom is larger, -1 the reverse).
• ox Number x of the world's projected coordinate system origin.
• oy Number y of the world's projected coordinate system origin.

Static Methods

• TileSystem.getDefault(projection): string | number[] — return the default tile system code for a projection

Built-in presets:

Constant	Meaning
web-mercator	Web Mercator (google/bing/AMap)
tms-global-mercator	TMS / mapbox mbtiles (EPSG:3857)
global-geodetic	EPSG:4326 global geodetic grid
tms-global-geodetic	TMS / OSGEO (EPSG:4326)
baidu	Baidu Maps