fix: add support for fractional zoom (#113)

googlemaps · Nov 22, 2021 · 73c0fe6 · 73c0fe6
1 parent 9057fb6
commit 73c0fe6
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Showing 2 changed files with 24 additions and 1 deletion.
diff --git a/src/algorithms/supercluster.test.ts b/src/algorithms/supercluster.test.ts
@@ -143,3 +143,26 @@ test("should not cluster if zoom beyond maxZoom", () => {
   expect(changed).toBeFalsy();
   expect(clusters).toBe(superCluster["clusters"]);
 });
+
+test("should round fractional zoom", () => {
+  const mapCanvasProjection =
+    jest.fn() as unknown as google.maps.MapCanvasProjection;
+  const markers: google.maps.Marker[] = [];
+
+  const superCluster = new SuperClusterAlgorithm({});
+  superCluster["superCluster"].getClusters = jest.fn().mockReturnValue([]);
+
+  map.getZoom = jest.fn().mockReturnValue(1.534);
+  superCluster.cluster({ map, mapCanvasProjection, markers });
+  expect(superCluster["superCluster"].getClusters).toHaveBeenCalledWith(
+    [-180, -90, 180, 90],
+    2
+  );
+
+  map.getZoom = jest.fn().mockReturnValue(3.234);
+  superCluster.cluster({ map, mapCanvasProjection, markers });
+  expect(superCluster["superCluster"].getClusters).toHaveBeenCalledWith(
+    [-180, -90, 180, 90],
+    3
+  );
+});
diff --git a/src/algorithms/supercluster.ts b/src/algorithms/supercluster.ts
@@ -93,7 +93,7 @@ export class SuperClusterAlgorithm extends AbstractAlgorithm {
 
   public cluster({ map }: AlgorithmInput): Cluster[] {
     return this.superCluster
-      .getClusters([-180, -90, 180, 90], map.getZoom())
+      .getClusters([-180, -90, 180, 90], Math.round(map.getZoom()))
       .map(this.transformCluster.bind(this));
   }