Clusters as pie charts

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This sample demonstrates how to represent clusters as pie charts. This is done by calling the createRendererForClustering method in the pieChart smart mapping module.

This method returns a list of aggregate fields and a renderer. Both of these objects must be set on the FeatureReductionCluster object for the charts to properly render.

Configure clustering
Use dark colors for code blocks
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Add line.Add line.          async function generateClusterConfig(layer){
            // generates default labelingInfo
            const { labelingInfo, clusterMinSize } = await clusterLabelCreator
              .getLabelSchemes({ layer, view })
              .then(labelSchemes => labelSchemes.primaryScheme );

            const labelSymbol = labelingInfo[0].symbol;
            labelSymbol.color = labelSymbol.haloColor.clone();
            labelSymbol.haloColor = [255,255,255,0.3];
            labelSymbol.font.size = 10;


            const { renderer, fields } = await pieChartRendererCreator
              .createRendererForClustering({
                layer,
                shape: "donut"
              });

            renderer.holePercentage = 0.66;

            const fieldInfos = fields.map( field => {
              return {
                fieldName: field.name,
                label: field.alias,
                format: {
                  places: 0,
                  digitSeparator: true
                }
              }
            });

            // maps the field names for the popup chart
            const fieldNames = fieldInfos.map(field => {
              return field.fieldName
            });

            const popupTemplate = {
              content: [{
                type: "text",
                text: "This cluster represents <b>{cluster_count}</b> features."
              },
              {
                type: "media",
                mediaInfos: [{
                  title: "311 Reports",
                  type: "pie-chart",
                  value: {
                    fields: fieldNames
                  }
                }]
              },
              {
                type: "fields"
              }],
              fieldInfos
            };

            return {
              type: "cluster",
              popupTemplate,
              labelingInfo,
              clusterMinSize,

              fields,
              renderer

            };
          }

Clustering is enabled via the featureReduction property of the FeatureLayer.

Set generated cluster configuration
Use dark colors for code blocksCopy
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          layer.when()
            .then(generateClusterConfig)
            .then((featureReduction) => {

              layer.featureReduction = featureReduction;

Clustering is a method of aggregating points in a FeatureLayer, CSVLayer, GeoJSONLayer, WFSLayer, or OGCFeatureLayer by grouping them in clusters defined by screen space.