提供要在椭球体表面上显示的图像。该类型描述了一个接口，并不打算直接实例化。 Provides imagery to be displayed on the surface of an ellipsoid. This type describes an interface and is not intended to be instantiated directly.
- ArcGisMapServerImageryProvider
- BingMapsImageryProvider
- OpenStreetMapImageryProvider
- TileMapServiceImageryProvider
- GoogleEarthEnterpriseImageryProvider
- GoogleEarthEnterpriseMapsProvider
- GridImageryProvider
- IonImageryProvider
- MapboxImageryProvider
- MapboxStyleImageryProvider
- SingleTileImageryProvider
- TileCoordinatesImageryProvider
- UrlTemplateImageryProvider
- WebMapServiceImageryProvider
- WebMapTileServiceImageryProvider
演示： Demo:
另见： See:
成员 Members
readonly credit : Credit
获取此图像提供程序处于活动状态时要显示的信用。通常，这用于证明图像的来源。 Gets the credit to display when this imagery provider is active. Typically this is used to credit the source of the imagery.
readonly errorEvent : Event
获取当图像提供程序遇到异步错误时引发的事件。通过订阅该事件，您将收到错误通知，并有可能从中恢复。事件监听器传递一个实例 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.
获取一个值，该值指示此图像提供程序提供的图像是否包含 Alpha 通道。如果此属性为 false，则 Alpha 通道（如果存在）将被忽略。如果此属性为 true，则任何没有 Alpha 通道的图像都将被视为其 Alpha 在任何地方都是 1.0。当此属性为 false 时，内存使用量和纹理上传时间都会减少。 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.
获取可以请求的最大详细程度。 Gets the maximum level-of-detail that can be requested.
获取可以请求的最低详细程度。通常，仅当图像的矩形足够小以致于最小级别的图块数量较小时才应使用最小级别。在最低级别上具有多个图块的图像提供程序将导致渲染问题。 Gets the minimum level-of-detail that can be requested. 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.
readonly proxy : Proxy
获取此提供者使用的代理。 Gets the proxy used by this provider.
readonly rectangle : Rectangle
获取实例提供的图像的矩形（以弧度为单位）。 Gets the rectangle, in radians, of the imagery provided by the instance.
readonly tileDiscardPolicy : TileDiscardPolicy
获取图块丢弃策略。如果未定义，则丢弃策略负责通过其 shouldDiscardImage 函数过滤掉“丢失”的图块。如果此函数返回未定义，则不会过滤任何图块。 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.
获取每个图块的高度（以像素为单位）。 Gets the height of each tile, in pixels.
获取每个图块的宽度（以像素为单位）。 Gets the width of each tile, in pixels.
readonly tilingScheme : TilingScheme
获取提供者使用的切片方案。 Gets the tiling scheme used by the provider.
方法 Methods
static Cesium.ImageryProvider.loadImage(imageryProvider, url) → Promise.<(ImageryTypes|CompressedTextureBuffer)>|undefined
从给定的 URL 加载图像。如果 URL 引用的服务器已经有太多待处理的请求，则此函数将返回 undefined，表明应稍后重试该请求。 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.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
imageryProvider |
ImageryProvider | URL 的图像提供者。 The imagery provider for the URL. |
url |
Resource | string | 图像的 URL。 The URL of the image. |
返回： Returns:
对图像的承诺，该承诺将在图像可用时解析，或者如果对服务器的活动请求太多，则未定义，并且应稍后重试该请求。 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.
getTileCredits(x, y, level) → Array.<Credit>
获取显示给定图块时要显示的积分。 Gets the credits to be displayed when a given tile is displayed.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
x |
number | 平铺 X 坐标。 The tile X coordinate. |
y |
number | 平铺 Y 坐标。 The tile Y coordinate. |
level |
number | 瓷砖水平； The tile level; |
返回： Returns:
显示图块时要显示的制作人员名单。 The credits to be displayed when the tile is displayed.
pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined
异步确定哪些要素（如果有）位于切片内给定经度和纬度处。此函数是可选的，因此它可能并不存在于所有 ImageryProvider 上。 Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile. This function is optional, so it may not exist on all ImageryProviders.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
x |
number | 平铺 X 坐标。 The tile X coordinate. |
y |
number | 平铺 Y 坐标。 The tile Y coordinate. |
level |
number | 瓷砖级别。 The tile level. |
longitude |
number | 选择要素的经度。 The longitude at which to pick features. |
latitude |
number | 选择特征的纬度。 The latitude at which to pick features. |
返回： Returns:
对所选取功能的承诺将在异步选取完成时解决。解析后的值是一个数组 A promise for the picked features that will resolve when the asynchronous picking completes. The resolved value is an array of
ImageryLayerFeatureInfo
实例。如果在给定位置未找到要素，则数组可能为空。如果不支持拾取，它也可能是未定义的。 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.<ImageryTypes>|undefined
请求给定图块的图像。 Requests the image for a given tile.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
x |
number | 平铺 X 坐标。 The tile X coordinate. |
y |
number | 平铺 Y 坐标。 The tile Y coordinate. |
level |
number | 瓷砖级别。 The tile level. |
request |
Request | 可选 optional 请求对象。仅供内部使用。 The request object. Intended for internal use only. |
返回： Returns:
返回图像的承诺，该承诺将在图像可用时解析，或者如果对服务器有太多活动请求，则返回未定义的图像，并且应稍后重试该请求。 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.