ImageryProvider

Members

readonlycredit : Credit

Scene/ImageryProvider.js 217

Gets the credit to display when this imagery provider is active. Typically this is used to credit the source of the imagery. This function should not be called before ImageryProvider#ready returns true.

defaultAlpha : Number

Scene/ImageryProvider.js 45

The default alpha blending value of this provider, with 0.0 representing fully transparent and 1.0 representing fully opaque.

Default Value: undefined

defaultBrightness : Number

Scene/ImageryProvider.js 54

The default brightness of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 makes the imagery darker while greater than 1.0 makes it brighter.

Default Value: undefined

defaultContrast : Number

Scene/ImageryProvider.js 63

The default contrast of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces the contrast while greater than 1.0 increases it.

Default Value: undefined

defaultGamma : Number

Scene/ImageryProvider.js 88

The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.

Default Value: undefined

defaultHue : Number

Scene/ImageryProvider.js 71

The default hue of this provider in radians. 0.0 uses the unmodified imagery color.

Default Value: undefined

defaultSaturation : Number

Scene/ImageryProvider.js 80

The default saturation of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces the saturation while greater than 1.0 increases it.

Default Value: undefined

readonlyerrorEvent : Event

Scene/ImageryProvider.js 205

Gets an event that is raised when the imagery provider encounters an asynchronous error.. By subscribing to the event, you will be notified of the error and can potentially recover from it. Event listeners are passed an instance of TileProviderError.

readonlyhasAlphaChannel : Boolean

Scene/ImageryProvider.js 241

Gets a value indicating whether or not the images provided by this imagery provider include an alpha channel. If this property is false, an alpha channel, if present, will be ignored. If this property is true, any images without an alpha channel will be treated as if their alpha is 1.0 everywhere. When this property is false, memory usage and texture upload time are reduced.

readonlymaximumLevel : Number

Scene/ImageryProvider.js 154

Gets the maximum level-of-detail that can be requested. This function should not be called before ImageryProvider#ready returns true.

readonlyminimumLevel : Number

Scene/ImageryProvider.js 169

Gets the minimum level-of-detail that can be requested. This function should not be called before ImageryProvider#ready returns true. Generally, a minimum level should only be used when the rectangle of the imagery is small enough that the number of tiles at the minimum level is small. An imagery provider with more than a few tiles at the minimum level will lead to rendering problems.

readonlyproxy : Proxy

Scene/ImageryProvider.js 227

Gets the proxy used by this provider.

readonlyready : Boolean

Scene/ImageryProvider.js 100

Gets a value indicating whether or not the provider is ready for use.

readonlyreadyPromise : Promise.<Boolean>

Scene/ImageryProvider.js 110

Gets a promise that resolves to true when the provider is ready for use.

readonlyrectangle : Rectangle

Scene/ImageryProvider.js 121

Gets the rectangle, in radians, of the imagery provided by the instance. This function should not be called before ImageryProvider#ready returns true.

readonlytileDiscardPolicy : TileDiscardPolicy

Scene/ImageryProvider.js 193

Gets the tile discard policy. If not undefined, the discard policy is responsible for filtering out "missing" tiles via its shouldDiscardImage function. If this function returns undefined, no tiles are filtered. This function should not be called before ImageryProvider#ready returns true.

readonlytileHeight : Number

Scene/ImageryProvider.js 143

Gets the height of each tile, in pixels. This function should not be called before ImageryProvider#ready returns true.

readonlytileWidth : Number

Scene/ImageryProvider.js 132

Gets the width of each tile, in pixels. This function should not be called before ImageryProvider#ready returns true.

readonlytilingScheme : TilingScheme

Scene/ImageryProvider.js 180

Gets the tiling scheme used by the provider. This function should not be called before ImageryProvider#ready returns true.

Methods

staticCesium.ImageryProvider.loadImage(url) → Promise.<(Image|Canvas)>|undefined

Scene/ImageryProvider.js 308

Loads an image from a given URL. If the server referenced by the URL already has too many requests pending, this function will instead return undefined, indicating that the request should be retried later.

Name	Type	Description
url	String	The URL of the image.

Returns:

A promise for the image that will resolve when the image is available, or undefined if there are too many active requests to the server, and the request should be retried later. The resolved image may be either an Image or a Canvas DOM object.

getTileCredits(x, y, level) → Array.<Credit>

Scene/ImageryProvider.js 257

Gets the credits to be displayed when a given tile is displayed.

Name	Type	Description
x	Number	The tile X coordinate.
y	Number	The tile Y coordinate.
level	Number	The tile level;

Returns:

The credits to be displayed when the tile is displayed.

Throws:

• DeveloperError : getTileCredits must not be called before the imagery provider is ready.

pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined

Scene/ImageryProvider.js 295

Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile. This function should not be called before ImageryProvider#ready returns true. This function is optional, so it may not exist on all ImageryProviders.

Name	Type	Description
x	Number	The tile X coordinate.
y	Number	The tile Y coordinate.
level	Number	The tile level.
longitude	Number	The longitude at which to pick features.
latitude	Number	The latitude at which to pick features.

Returns:

A promise for the picked features that will resolve when the asynchronous picking completes. The resolved value is an array of ImageryLayerFeatureInfo instances. The array may be empty if no features are found at the given location. It may also be undefined if picking is not supported.

Throws:

• DeveloperError : pickFeatures must not be called before the imagery provider is ready.

requestImage(x, y, level) → Promise.<(Image|Canvas)>|undefined

Scene/ImageryProvider.js 274

Requests the image for a given tile. This function should not be called before ImageryProvider#ready returns true.

Name	Type	Description
x	Number	The tile X coordinate.
y	Number	The tile Y coordinate.
level	Number	The tile level.

Returns:

A promise for the image that will resolve when the image is available, or undefined if there are too many active requests to the server, and the request should be retried later. The resolved image may be either an Image or a Canvas DOM object.

Throws:

• DeveloperError : requestImage must not be called before the imagery provider is ready.