require(["esri/views/layers/ViewshedLayerView"], (ViewshedLayerView) => { /* code goes here */ });
import ViewshedLayerView from "@arcgis/core/views/layers/ViewshedLayerView.js";
esri/views/layers/ViewshedLayerView
Represents the LayerView of a ViewshedLayer after it has been added to a Map in a SceneView.
The viewshed layer view controls whether the viewsheds in its associated ViewshedLayer.source can be created or edited interactively.
// create new layer and add it to the scene view
const viewshedLayer = new ViewshedLayer();
view.map.add(viewshedLayer);
// retrieve layer view for the layer
view.whenLayerView(viewshedLayer).then(viewshedLayerView => {
// allow existing viewsheds in the layer to be edited by selecting them
viewshedLayerView.interactive = true;
// start adding new viewsheds interactively
viewshedLayerView.createViewsheds();
});
- See also
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
The name of the class. | Accessor | ||
Set to | ViewshedLayerView | ||
The layer being viewed. | ViewshedLayerView | ||
The selected viewshed. | ViewshedLayerView | ||
Value is | ViewshedLayerView | ||
Indicates if the layer view is making any updates that will impact what is displayed on the map. | LayerView | ||
A reference to the MapView or SceneView associated with the layer view. | LayerView | ||
When | LayerView | ||
When | LayerView | ||
When | LayerView |
Property Details
-
layer
layer ViewshedLayerreadonly
-
The layer being viewed.
-
selectedViewshed
selectedViewshed Viewshed
-
The selected viewshed. If interactive is
true
, any viewshed in the layer can be selected by clicking on it in the view. As long as interactive remainstrue
, the properties of the selected viewshed can be edited by interacting with manipulators in the view.
-
suspended
suspended Booleanreadonly
-
Value is
true
if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).
-
updating
InheritedPropertyupdating Booleanreadonly
Inherited from LayerView -
Indicates if the layer view is making any updates that will impact what is displayed on the map. For example, this value is
true
when renderer, definitionExpression, filter or effect is changed or if the layer view is in the process of the fetching data.Watch dataUpdating property instead to only know when the data has been updated (e.g. to run statistics query on all feature available in the layer view).
- Default Value:false
Example// Check for the first time layerView.updating becomes false. Then query for // features that are visible within the view associated with the layer view. await reactiveUtils.whenOnce(() => !layerView.updating); const query = layerView.createQuery(); query.geometry = layerView.view.extent; const result = layerView.queryFeatures(query);
-
Inherited from LayerView
-
Example
// Check for the first time layerView.updating becomes false. Then query for // features that are visible within the view associated with the layer view. await reactiveUtils.whenOnce(() => !layerView.updating); const query = layerView.createQuery(); query.geometry = layerView.view.extent; const result = layerView.queryFeatures(query);
-
visible
InheritedPropertyvisible Boolean
Inherited from LayerView -
When
true
, the layer is visible in the view. Value of this property is inherited from thelayer.visible
unless the developer overrides it. ThelayerView.visible
will take precedence overlayer.visible
if both properties are set.- Default Value:true
-
visibleAtCurrentScale
InheritedPropertyvisibleAtCurrentScale Booleanreadonly
Inherited from LayerView -
When
true
, the layer is visible in the view at the current scale. This applies to layers that haveminScale
andmaxScale
properties set.Known Limitations
- This property is not supported in 3D SceneView tiled layers.
- Default Value:true
- See also
-
visibleAtCurrentTimeExtent
InheritedPropertyvisibleAtCurrentTimeExtent Booleanreadonly
Inherited from LayerView -
When
true
, the layer is visible in the view's timeExtent. This applies to layers that have a visibilityTimeExtent.- Default Value:true
- See also
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. | Accessor | ||
Promise | Starts the interactive creation of new viewsheds and adds them to the layer source. | ViewshedLayerView | |
Returns true if a named group of handles exist. | Accessor | ||
| LayerView | ||
| LayerView | ||
| LayerView | ||
Removes a group of handles owned by the object. | Accessor | ||
Promise |
| LayerView |
Method Details
-
Inherited from Accessor
-
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();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey 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.
-
Starts the interactive creation of new viewsheds and adds them to the layer source. The first click in the scene places the observer point and the second sets the viewshed's orientation.
The creation process will finish when the user double-clicks the mouse or presses the escape key. In order to otherwise stop the creation process, pass an abort signal as an argument when calling the method.
let abortController; view.whenLayerView(viewshedLayer).then(viewshedLayerView => { // create a new controller abortController = new AbortController(); // pass the controller as an argument to the interactive creation method viewshedLayerView.createViewsheds(abortController); // abort the controller to stop the creation process abortController.abort(); });
Calling this method sets interactive to
true
.Note that when placing viewsheds interactively, the viewshed is created with a 1.5 meter vertical offset from the scene. This behavior is subject to change in a future release.
Parametersoptions ObjectoptionalAn object specifying additional options.
Specificationsignal AbortSignaloptionalAbort signal which can be used to cancel creation.
ReturnsType Description Promise A promise which resolves when creation is completed, or rejects if creation is cancelled.
-
hasHandles
InheritedMethodhasHandles(groupKey){Boolean}
Inherited from Accessor -
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType 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"); }
-
isFulfilled
InheritedMethodisFulfilled(){Boolean}
Inherited from LayerView -
isFulfilled()
may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled,true
will be returned.ReturnsType Description Boolean Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).
-
isRejected
InheritedMethodisRejected(){Boolean}
Inherited from LayerView -
isRejected()
may be used to verify if creating an instance of the class is rejected. If it is rejected,true
will be returned.ReturnsType Description Boolean Indicates whether creating an instance of the class has been rejected.
-
isResolved
InheritedMethodisResolved(){Boolean}
Inherited from LayerView -
isResolved()
may be used to verify if creating an instance of the class is resolved. If it is resolved,true
will be returned.ReturnsType Description Boolean Indicates whether creating an instance of the class has been resolved.
-
Inherited from Accessor
-
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
-
Inherited from LayerView
-
when()
may be leveraged once an instance of the class is created. This method takes two input parameters: acallback
function and anerrback
function. Thecallback
executes when the instance of the class loads. Theerrback
executes if the instance of the class fails to load.ParametersReturnsType Description Promise Returns a new promise for the result of callback
that may be used to chain additional functions.Example// Although this example uses MapView, any class instance that is a promise may use when() in the same way let view = new MapView(); view.when(function(){ // This function will execute once the promise is resolved }, function(error){ // This function will execute if the promise is rejected due to an error });