support supercluster#244 arrayType option within cluster sources

package.json

@@ -39,7 +39,7 @@
     "quickselect": "^3.0.0",
     "rw": "^1.3.3",
     "serialize-to-js": "^3.1.2",
-    "supercluster": "^8.0.1",
+    "supercluster": "andrewharvey/supercluster#244",
     "tinyqueue": "^3.0.0",
     "tweakpane": "^4.0.4",
     "vt-pbf": "^3.1.3"

src/source/geojson_source.ts

@@ -156,7 +156,8 @@ class GeoJSONSource extends Evented<SourceEvents> implements ISource {
                 extent: EXTENT,
                 radius: (options.clusterRadius !== undefined ? options.clusterRadius : 50) * scale,
                 log: false,
-                generateId: options.generateId || false
+                generateId: options.generateId || false,
+                arrayType: options.clusterArrayType || 'Float32Array'
             },
             clusterProperties: options.clusterProperties,
             filter: options.filter,

src/source/geojson_worker_source.ts

@@ -321,6 +321,12 @@ function getSuperclusterOptions({
         }
     };
 
+    // convert String option value into a TypedArray constructor
+    const arrayTypes = {
+        Float32Array, Float64Array
+    };
+    superclusterOptions.arrayType = arrayTypes[superclusterOptions.arrayType];
+
     return superclusterOptions;
 }
 

src/style-spec/reference/v8.json

@@ -1005,6 +1005,19 @@
       "type": "*",
       "doc": "An object defining custom properties on the generated clusters if clustering is enabled, aggregating values from clustered points. Has the form `{\"property_name\": [operator, map_expression]}`. `operator` is any expression function that accepts at least 2 operands (e.g. `\"+\"` or `\"max\"`) — it accumulates the property value from clusters/points the cluster contains; `map_expression` produces the value of a single point.\n\nExample: `{\"sum\": [\"+\", [\"get\", \"scalerank\"]]}`.\n\nFor more advanced use cases, in place of `operator`, you can use a custom reduce expression that references a special `[\"accumulated\"]` value, e.g.:\n`{\"sum\": [[\"+\", [\"accumulated\"], [\"get\", \"sum\"]], [\"get\", \"scalerank\"]]}`"
     },
+    "clusterArrayType": {
+      "type": "enum",
+      "default": "Float32Array",
+      "values": {
+        "Float32Array": {
+          "doc": "A Float32Array"
+        },
+        "Float64Array": {
+          "doc": "A Float64Array"
+        }
+      },
+      "doc": "TypedArray to use for clustering, for clusterMaxZoom values and lower clusterRadius values you may need to increase this to Float64Array for more accurate clusters."
+    },
     "lineMetrics": {
       "type": "boolean",
       "default": false,

src/style-spec/types.ts

@@ -255,6 +255,7 @@ export type GeoJSONSourceSpecification = {
     "clusterMaxZoom"?: number,
     "clusterMinPoints"?: number,
     "clusterProperties"?: unknown,
+    "clusterArrayType"?: "Float32Array" | "Float64Array",
     "lineMetrics"?: boolean,
     "generateId"?: boolean,
     "promoteId"?: PromoteIdSpecification,