GridImageryProvider

new Cesium.GridImageryProvider(options, backgroundColor)

An ImageryProvider that draws a wireframe grid on every tile with controllable background and glow. May be useful for custom rendering effects or debugging terrain.
Name Type Default Description
options Object optional Object with the following properties:
Name Type Default Description
tilingScheme TilingScheme new GeographicTilingScheme() optional The tiling scheme for which to draw tiles.
ellipsoid Ellipsoid optional The ellipsoid. If the tilingScheme is specified, this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither parameter is specified, the WGS84 ellipsoid is used.
cells Number 8 optional The number of grids cells.
color Color Color(1.0, 1.0, 1.0, 0.4) optional The color to draw grid lines.
glowColor Color Color(0.0, 1.0, 0.0, 0.05) optional The color to draw glow for grid lines.
glowWidth Number 6 optional The width of lines used for rendering the line glow effect.
backgroundColor Color Color(0.0, 0.5, 0.0, 0.2) optional Background fill color.
options.tileWidth Number 256 optional The width of the tile for level-of-detail selection purposes.
options.tileHeight Number 256 optional The height of the tile for level-of-detail selection purposes.
options.canvasSize Number 256 optional The size of the canvas used for rendering.

Members

readonlycredit : Credit

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 GridImageryProvider#ready returns true.

readonlyerrorEvent : Event

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

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

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

readonlyminimumLevel : Number

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

readonlyproxy : Proxy

Gets the proxy used by this provider.

readonlyready : Boolean

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

readonlyreadyPromise : Promise.<Boolean>

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

readonlyrectangle : Rectangle

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

readonlytileDiscardPolicy : TileDiscardPolicy

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 GridImageryProvider#ready returns true.

readonlytileHeight : Number

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

readonlytileWidth : Number

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

readonlytilingScheme : TilingScheme

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

Methods

_createGridCanvas()

Render a grid into a canvas with background and glow

_drawGrid()

Draws a grid of lines into a canvas.

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

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

Picking features is not currently supported by this imagery provider, so this function simply returns undefined.
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.

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

Requests the image for a given tile. This function should not be called before GridImageryProvider#ready returns true.
Name Type Description
x Number The tile X coordinate.
y Number The tile Y coordinate.
level Number The tile level.
request Request optional The request object. Intended for internal use only.
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.