热力图影像提供器,将热力图效果以影像图层的形式查看。
| Name | Type | Description |
|---|---|---|
options |
Object |
参考HeatmapEffect构造参数,其中参数show无效. |
Example:
const heatmapImageryLayer = viewer.imageryLayers.addImageryProvider(
new Cesium.HeatmapImageryProvider({
scene : viewer.scene,
data : staticHeatmapEffectFakeData,
lonField : "lon",
latField : "lat",
valueField : "value",
dynamic : false,
scaling : 400
})
);
// 注意：heatmapImageryLayer instanceof Cesium.ImageryLayer // true
// heatmapImageryLayer instanceof Cesium.HeatmapImageryProvider // false
heatmapImageryLayer.show = true;
heatmapImageryLayer.saturation = 2.0;Members
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
HeatmapImageryProvider#ready returns true.
The default alpha blending value of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
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
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
The default alpha blending value on the day side of the globe of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.
-
Default Value:
undefined
The default hue of this provider in radians. 0.0 uses the unmodified imagery color.
-
Default Value:
undefined
defaultMagnificationFilter : TextureMagnificationFilter
The default texture magnification filter to apply to this provider.
-
Default Value:
undefined
defaultMinificationFilter : TextureMinificationFilter
The default texture minification filter to apply to this provider.
-
Default Value:
undefined
The default alpha blending value on the night side of the globe of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
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
readonly errorEvent : 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.
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.
Gets the maximum level-of-detail that can be requested. This function should
not be called before
HeatmapImageryProvider#ready returns true.
Gets the minimum level-of-detail that can be requested. This function should
not be called before
HeatmapImageryProvider#ready returns true.
Gets the proxy used by this provider.
Gets a value indicating whether or not the provider is ready for use.
Gets a promise that resolves to true when the provider is ready for use.
readonly rectangle : Rectangle
Gets the rectangle, in radians, of the imagery provided by this instance. This function should
not be called before
HeatmapImageryProvider#ready returns true.
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
HeatmapImageryProvider#ready returns true.
Gets the height of each tile, in pixels. This function should
not be called before
HeatmapImageryProvider#ready returns true.
Gets the width of each tile, in pixels. This function should
not be called before
HeatmapImageryProvider#ready returns true.
readonly tilingScheme : TilingScheme
Gets the tiling scheme used by this provider. This function should
not be called before
HeatmapImageryProvider#ready returns true.
Gets the URL of the single, top-level imagery tile.
Methods
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.
不支持拾取操作
| 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:
picking is not supported.
Requests the image for a given tile. This function should
not be called before
HeatmapImageryProvider#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.
Throws:
-
DeveloperError :
requestImagemust not be called before the imagery provider is ready.