Feature: first version of clustering at low zoom levels, filters don't update yet (WIP)

test/Logic/FeatureSource/ClusteringFeatureSource.spec.ts

@@ -0,0 +1,81 @@
+import { FeatureCollection, Point } from "geojson"
+import { describe, it } from "vitest"
+import StaticFeatureSource from "../../../src/Logic/FeatureSource/Sources/StaticFeatureSource"
+import { ClusteringFeatureSource } from "../../../src/Logic/FeatureSource/TiledFeatureSource/ClusteringFeatureSource"
+import { UIEventSource } from "../../../src/Logic/UIEventSource"
+import { expect } from "chai"
+
+const points: FeatureCollection<Point> = {
+    "type": "FeatureCollection",
+    "features": [
+        {
+            "type": "Feature",
+            "properties": {name: "a"},
+            "geometry": {
+                "coordinates": [
+                    9.759318139161195,
+                    55.56552169756637
+                ],
+                "type": "Point"
+            }
+        },
+        {
+            "type": "Feature",
+            "properties": {name: "b"},
+            "geometry": {
+                "coordinates": [
+                    9.759768615515327,
+                    55.56569930560951
+                ],
+                "type": "Point"
+            }
+        },
+        {
+            "type": "Feature",
+            "properties": {name: "c"},
+            "geometry": {
+                "coordinates": [
+                    9.75879327221594,
+                    55.56569229478089
+                ],
+                "type": "Point"
+            }
+        },
+        {
+            "type": "Feature",
+            "properties": {name: "d"},
+            "geometry": {
+                "coordinates": [
+                    9.759380131319915,
+                    55.56507066300628
+                ],
+                "type": "Point"
+            }
+        }
+    ]
+}
+
+describe("ClusteringFeatureSource", () => {
+    it("smallTest", () => {
+        const source = new StaticFeatureSource(points.features)
+        const zoom = new UIEventSource(19)
+        // On zoomlevel 19, all points are in a different tile
+        const clusteringSource = new ClusteringFeatureSource(source, zoom, "test", {
+            cutoff: 2,
+            dontClusterAboveZoom: 100
+        })
+        expect(clusteringSource.summaryPoints.features.data.length).to.eq(0)
+        expect(clusteringSource.features.data.length).to.eq(4)
+
+        zoom.set(13)
+
+        const summary = clusteringSource.summaryPoints.features.data
+        expect(summary.length).to.eq(1)
+        expect(summary[0].properties["total_metric"]).to.eq("4")
+        expect(clusteringSource.features.data.length).to.eq(0)
+
+
+
+
+    })
+})