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,