clusters

Method Overview

Method Details

getLabelSchemes(params){Promise<Schemes>}

Generates default labelingInfo schemes to be set on a FeatureLayer's featureReduction configuration. Returns one or more suggested LabelClasses for a given layer based on its renderer. It also returns a suggested clusterMinSize to ensure labels fit inside clusters.

If a renderer has a non-scale dependent SizeVariable, then the average value of the field or expression used to determine the cluster size will be suggested as the default label value. In all other scenarios, the suggested label will display the cluster count in the center of the label.

Parameters

Specification

params Object See the table below for details of each parameter that may be passed to this function. Specification layer FeatureLayer|CSVLayer|GeoJSONLayer|WFSLayer|OGCFeatureLayer|StreamLayer The point layer that has or will have clustering enabled. view MapView The view where the input layer will be rendered. field String optional The name of the AggregateField to use in the primary label scheme. If not specified, then the label will be based on the data used to vary cluster size. renderer Renderer optional The renderer to set on the input layer when clustering is enabled. Specify this parameter if the layer's renderer does not match the renderer that will be used when clustering is enabled. This cannot be a HeatmapRenderer.

Returns

Type	Description
Promise<Schemes>	Returns an object containing suggested primary and secondary labeling schemes to be set on the layer's featureReduction property.

Example

// Sets suggested labels on the clusters based on the underlying renderer
clusterLabelCreator.getLabelSchemes({
  layer: featureLayer,
  view: view
}).then(function(labelSchemes){
  const featureReduction = featureLayer.featureReduction.clone();
  const { labelingInfo, clusterMinSize } = labelSchemes.primaryScheme;
  featureReduction.labelingInfo = labelingInfo;
  featureReduction.clusterMinSize = clusterMinSize;

  featureLayer.featureReduction = featureReduction;
}).catch(function(error){
  console.error(error);
});

Type Definitions

Scheme

Contains a suggested labelingInfo to be set on the layer's featureReduction.labelingInfo.

Properties

name String The name of the generated cluster labeling scheme. This can be used in the UI of web map authoring apps.

fieldName String The name of the aggregate field the labeling scheme is based on. This can be used in the UI of web map authoring apps.

labelingInfo LabelClass[] An array of LabelClass objects to set on the layer's featureReduction.labelingInfo property.

clusterMinSize Number The suggested featureReduction.clusterMinSize required to fit labels within clusters.

Schemes

The return object of the getLabelSchemes() method.

Properties

primaryScheme Scheme Includes the primary labeling scheme suggested for the input layer's clusters.

secondarySchemes Scheme[] Includes secondary labeling schemes suggested for the input layer's clusters.