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Showing content from https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-support-TileInfo.html below:

TileInfo | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import TileInfo from "@arcgis/core/layers/support/TileInfo.js";

CDN: const TileInfo = await $arcgis.import("@arcgis/core/layers/support/TileInfo.js");

Class: @arcgis/core/layers/support/TileInfo

Since: ArcGIS Maps SDK for JavaScript 4.0

Contains information about the tiling scheme for TileLayers, ElevationLayers, ImageryTileLayers, VectorTileLayers, and WebTileLayers.

TileInfo defines properties such as tile format, the level of details (LOD) at which the cache has tiles, the size of the tiles in pixels, and the screen resolution for which the tiles are intended to be most commonly displayed.

Property Overview Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties Hide inherited properties

Property Details

declaredClass Inherited Property declaredClass Stringreadonly Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.: The name of the class. The declared class name is formatted as esri.folder.className.

: The dots per inch (DPI) of the tiling scheme. If a DPI is chosen that does not match the resolution of the output device, the scale of the map tile will appear incorrect. The default value is 96.

Image format of the cached tiles.

Possible Values:"png" |"png8" |"png24" |"png32" |"jpg" |"dib" |"tiff" |"emf" |"ps" |"pdf" |"gif" |"svg" |"svgz" |"mixed" |"lerc" |"lerc2d" |"pbf" |"raw"

isWrappable Property isWrappable Booleanreadonly Since: ArcGIS Maps SDK for JavaScript 4.5 TileInfo since 4.0, isWrappable added at 4.5.: Indicates if the tiling scheme supports wrap around.

: An array of levels of detail that define the tiling scheme.

: The tiling scheme origin. The upper left corner of the tiling scheme, in coordinates of the spatial reference of the source data.

Size of tiles in pixels.

Example

// sets the height and width of each tile to [ 256, 256 ]
tileInfo.size = 256;

: The spatial reference of the tiling schema.

Method Overview

Show inherited methods Hide inherited methods

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

create Method create(options){TileInfo}static

A convenience method used to create a new TileInfo instance with preset properties like LODs. Optionally, properties such as size, scales[], and a SpatialReference can also be set to calculate LODs for each TileInfo. This is useful in cases where the default amount of LODs provided are not sufficient. For example, if wanting to set the view's scale 1:1, additional LODs must be created. An example of setting this scale and creating additional LODs is provided in the example snippet below.

Parameters

Specification

optional

An object that contains the size, scales, and/or SpatialReference used to compute the new TileInfo instance.

Specification

optional

Default Value: 256

The size of each tile in pixels.

optional

Default Value: 24

Total number of LODs to create.

optional

Default Value: WebMercator

The spatial reference for the new TileInfo instance. If the spatial reference is not WGS84 nor WebMercator, the origin of the TileInfo is 0.0.

optional

Default Value: The scales provided by ArcGIS Online basemaps

An array of scale values to use for the TileInfo. If none are specified, the scales from the ArcGIS Online basemaps are used from level 0 through 24.

Returns

Type Description TileInfo A new TileInfo instance. The scales determine what LODs to create. The DPI defaults to 96 and currently cannot be modified.

Examples

// This snippet shows how to create a TileInfo instance using the default
// settings and passing its resulting LODs to a MapView's constraints

let view = new MapView({
  container: "viewDiv",
  map: map,
  constraints: {
    lods: TileInfo.create().lods
  }
});

// This snippet shows how to set the MapView scale 1:1 while generating additional LODs for the MapView.constraints.
const spatialReference = new SpatialReference({
  wkid: 2154
});

const center = new Point({
  x: 0,
  y: 0,
  spatialReference
});

// Create LODs from level 0 to 31
const tileInfo = TileInfo.create({
  spatialReference,
  numLODs: 32
});

const lods = tileInfo.lods;

let view = new MapView({
  container: "viewDiv",
  map,
  scale: 1,
  center,
  spatialReference,
  constraints: {
    lods: lods,
    snapToZoom: false
  }
});

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Returns

Type Description * | null | undefined Returns a new instance of this class.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type Description Boolean Returns true if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles Inherited Method removeHandles(groupKey) Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

scaleToZoom Method scaleToZoom(scale){Number}

Utility method used to convert a scale value to its corresponding zoom value.

Parameter

The scale value to convert.

Returns

Type Description Number The returned zoom value.

Example

// get the zoom value for the vector tile layer at the given scale
// then set the view.zoom to match layer's zoom level.
view.when(function(){
  view.zoom = layer.tileInfo.scaleToZoom(9027);
});

zoomToScale Method zoomToScale(zoom){Number}

Utility method used to convert a zoom value to its corresponding scale value.

Parameter

The zoom value to convert.

Returns

Type Description Number The returned scale value.

Example

// get the scale value for the vector tile layer at the view zoom level
// then set the view.scale to match layer's scale.
view.when(function(){
  view.scale = vectorLayer.tileInfo.zoomToScale(view.zoom);
});

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