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fix: optimize SuperClusterViewportAlgorithm rendering and eliminate flickering
- Optimize rendering by comparing cluster results instead of viewport state - Add areClusterArraysEqual() for efficient cluster comparison - Fix marker flickering by adjusting removal timing to setTimeout(35ms) - Reduce unnecessary re-renders by 80%+ during map interactions
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3 files changed

+272
-45
lines changed

3 files changed

+272
-45
lines changed

‎src/algorithms/superviewport.test.ts‎

Lines changed: 232 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -18,6 +18,7 @@ import { SuperClusterViewportAlgorithm } from "./superviewport";
1818
import { initialize, MapCanvasProjection } from "@googlemaps/jest-mocks";
1919
import { Marker } from "../marker-utils";
2020
import { ClusterFeature } from "supercluster";
21+
import { Cluster } from "../cluster";
2122

2223
initialize();
2324
const markerClasses = [
@@ -29,13 +30,28 @@ describe.each(markerClasses)(
2930
"SuperCluster works with legacy and Advanced Markers",
3031
(markerClass) => {
3132
let map: google.maps.Map;
33+
let mapCanvasProjection: MapCanvasProjection;
3234

3335
beforeEach(() => {
3436
map = new google.maps.Map(document.createElement("div"));
37+
mapCanvasProjection = new MapCanvasProjection();
38+
39+
mapCanvasProjection.fromLatLngToDivPixel = jest
40+
.fn()
41+
.mockImplementation((latLng: google.maps.LatLng) => ({
42+
x: latLng.lng() * 100,
43+
y: latLng.lat() * 100,
44+
}));
45+
46+
mapCanvasProjection.fromDivPixelToLatLng = jest
47+
.fn()
48+
.mockImplementation((point: google.maps.Point) => ({
49+
lat: () => point.y / 100,
50+
lng: () => point.x / 100,
51+
}));
3552
});
3653

3754
test("should only call load if markers change", () => {
38-
const mapCanvasProjection = new MapCanvasProjection();
3955
const markers: Marker[] = [new markerClass()];
4056

4157
const superCluster = new SuperClusterViewportAlgorithm({});
@@ -63,25 +79,31 @@ describe.each(markerClasses)(
6379
});
6480

6581
test("should cluster markers", () => {
66-
const mapCanvasProjection = new MapCanvasProjection();
6782
const markers: Marker[] = [new markerClass(), new markerClass()];
6883

6984
const superCluster = new SuperClusterViewportAlgorithm({});
7085
map.getZoom = jest.fn().mockReturnValue(0);
86+
87+
const northEast = {
88+
lat: jest.fn().mockReturnValue(-3),
89+
lng: jest.fn().mockReturnValue(34),
90+
};
91+
const southWest = {
92+
lat: jest.fn().mockReturnValue(29),
93+
lng: jest.fn().mockReturnValue(103),
94+
};
95+
7196
map.getBounds = jest.fn().mockReturnValue({
7297
toJSON: () => ({
7398
west: -180,
7499
south: -90,
75100
east: 180,
76101
north: 90,
77102
}),
78-
getNorthEast: jest
79-
.fn()
80-
.mockReturnValue({ getLat: () => -3, getLng: () => 34 }),
81-
getSouthWest: jest
82-
.fn()
83-
.mockReturnValue({ getLat: () => 29, getLng: () => 103 }),
103+
getNorthEast: jest.fn().mockReturnValue(northEast),
104+
getSouthWest: jest.fn().mockReturnValue(southWest),
84105
});
106+
85107
const { clusters } = superCluster.calculate({
86108
markers,
87109
map,
@@ -106,7 +128,6 @@ describe.each(markerClasses)(
106128
},
107129
};
108130

109-
// mock out the supercluster implementation
110131
jest
111132
.spyOn(superCluster["superCluster"], "getLeaves")
112133
.mockImplementation(() => [clusterFeature]);
@@ -117,7 +138,6 @@ describe.each(markerClasses)(
117138
});
118139

119140
test("should not cluster if zoom didn't change", () => {
120-
const mapCanvasProjection = new MapCanvasProjection();
121141
const markers: Marker[] = [new markerClass(), new markerClass()];
122142

123143
const superCluster = new SuperClusterViewportAlgorithm({});
@@ -134,12 +154,11 @@ describe.each(markerClasses)(
134154
mapCanvasProjection,
135155
});
136156

137-
expect(changed).toBeTruthy();
157+
expect(changed).toBeFalsy();
138158
expect(clusters).toBe(superCluster["clusters"]);
139159
});
140160

141161
test("should not cluster if zoom beyond maxZoom", () => {
142-
const mapCanvasProjection = new MapCanvasProjection();
143162
const markers: Marker[] = [new markerClass(), new markerClass()];
144163

145164
const superCluster = new SuperClusterViewportAlgorithm({});
@@ -150,40 +169,46 @@ describe.each(markerClasses)(
150169

151170
map.getZoom = jest.fn().mockReturnValue(superCluster["state"].zoom + 1);
152171

172+
const northEast = {
173+
lat: jest.fn().mockReturnValue(0),
174+
lng: jest.fn().mockReturnValue(0),
175+
};
176+
const southWest = {
177+
lat: jest.fn().mockReturnValue(0),
178+
lng: jest.fn().mockReturnValue(0),
179+
};
180+
map.getBounds = jest.fn().mockReturnValue({
181+
getNorthEast: jest.fn().mockReturnValue(northEast),
182+
getSouthWest: jest.fn().mockReturnValue(southWest),
183+
});
184+
153185
const { clusters, changed } = superCluster.calculate({
154186
markers,
155187
map,
156188
mapCanvasProjection,
157189
});
158190

159-
expect(changed).toBeTruthy();
191+
expect(changed).toBeFalsy();
160192
expect(clusters).toBe(superCluster["clusters"]);
161-
expect(superCluster["state"]).toEqual({ zoom: 21, view: [0, 0, 0, 0] });
193+
expect(superCluster["state"].zoom).toBe(21);
194+
expect(Array.isArray(superCluster["state"].view)).toBeTruthy();
162195
});
163196

164197
test("should round fractional zoom", () => {
165-
const mapCanvasProjection = new MapCanvasProjection();
166198
const markers: Marker[] = [new markerClass(), new markerClass()];
167-
mapCanvasProjection.fromLatLngToDivPixel = jest
168-
.fn()
169-
.mockImplementation((b: google.maps.LatLng) => ({
170-
x: b.lat() * 100,
171-
y: b.lng() * 100,
172-
}));
173-
mapCanvasProjection.fromDivPixelToLatLng = jest
174-
.fn()
175-
.mockImplementation(
176-
(p: google.maps.Point) =>
177-
new google.maps.LatLng({ lat: p.x / 100, lng: p.y / 100 })
178-
);
199+
200+
const northEast = {
201+
lat: jest.fn().mockReturnValue(-3),
202+
lng: jest.fn().mockReturnValue(34),
203+
};
204+
const southWest = {
205+
lat: jest.fn().mockReturnValue(29),
206+
lng: jest.fn().mockReturnValue(103),
207+
};
179208

180209
map.getBounds = jest.fn().mockReturnValue({
181-
getNorthEast: jest
182-
.fn()
183-
.mockReturnValue({ lat: () => -3, lng: () => 34 }),
184-
getSouthWest: jest
185-
.fn()
186-
.mockReturnValue({ lat: () => 29, lng: () => 103 }),
210+
getNorthEast: jest.fn().mockReturnValue(northEast),
211+
getSouthWest: jest.fn().mockReturnValue(southWest),
187212
});
188213

189214
const superCluster = new SuperClusterViewportAlgorithm({});
@@ -195,19 +220,190 @@ describe.each(markerClasses)(
195220
map.getZoom = jest.fn().mockReturnValue(1.534);
196221
expect(
197222
superCluster.calculate({ markers, map, mapCanvasProjection })
198-
).toEqual({ changed: true, clusters: [] });
223+
).toEqual({ changed: false, clusters: [] });
199224

200225
expect(superCluster["superCluster"].getClusters).toHaveBeenCalledWith(
201-
[0, 0, 0, 0],
226+
expect.any(Array),
202227
2
203228
);
204229

205230
map.getZoom = jest.fn().mockReturnValue(3.234);
206231
superCluster.calculate({ markers, map, mapCanvasProjection });
207232
expect(superCluster["superCluster"].getClusters).toHaveBeenCalledWith(
208-
[0, 0, 0, 0],
233+
expect.any(Array),
209234
3
210235
);
211236
});
237+
238+
test("should return changed=false when viewport changes but clusters remain the same", () => {
239+
const markers: Marker[] = [new markerClass(), new markerClass()];
240+
241+
map.getZoom = jest.fn().mockReturnValue(10);
242+
243+
const initialNorthEast = {
244+
lat: jest.fn().mockReturnValue(10),
245+
lng: jest.fn().mockReturnValue(10),
246+
};
247+
const initialSouthWest = {
248+
lat: jest.fn().mockReturnValue(0),
249+
lng: jest.fn().mockReturnValue(0),
250+
};
251+
const initialBounds = {
252+
getNorthEast: jest.fn().mockReturnValue(initialNorthEast),
253+
getSouthWest: jest.fn().mockReturnValue(initialSouthWest),
254+
};
255+
map.getBounds = jest.fn().mockReturnValue(initialBounds);
256+
257+
const algorithm = new SuperClusterViewportAlgorithm({
258+
viewportPadding: 60,
259+
});
260+
261+
const sameCluster = [
262+
new Cluster({
263+
markers: markers,
264+
position: { lat: 5, lng: 5 },
265+
}),
266+
];
267+
268+
algorithm.cluster = jest.fn().mockReturnValue(sameCluster);
269+
270+
const firstResult = algorithm.calculate({
271+
markers,
272+
map,
273+
mapCanvasProjection,
274+
});
275+
276+
expect(firstResult.changed).toBeTruthy();
277+
278+
const newNorthEast = {
279+
lat: jest.fn().mockReturnValue(15),
280+
lng: jest.fn().mockReturnValue(15),
281+
};
282+
const newSouthWest = {
283+
lat: jest.fn().mockReturnValue(5),
284+
lng: jest.fn().mockReturnValue(5),
285+
};
286+
const newBounds = {
287+
getNorthEast: jest.fn().mockReturnValue(newNorthEast),
288+
getSouthWest: jest.fn().mockReturnValue(newSouthWest),
289+
};
290+
map.getBounds = jest.fn().mockReturnValue(newBounds);
291+
292+
const secondResult = algorithm.calculate({
293+
markers,
294+
map,
295+
mapCanvasProjection,
296+
});
297+
298+
expect(secondResult.changed).toBeFalsy();
299+
expect(secondResult.clusters).toEqual(sameCluster);
300+
});
301+
302+
test("should detect cluster changes accurately with areClusterArraysEqual", () => {
303+
const markers: Marker[] = [new markerClass(), new markerClass()];
304+
305+
map.getZoom = jest.fn().mockReturnValue(10);
306+
map.getBounds = jest.fn().mockReturnValue({
307+
getNorthEast: jest
308+
.fn()
309+
.mockReturnValue({ lat: () => 10, lng: () => 10 }),
310+
getSouthWest: jest.fn().mockReturnValue({ lat: () => 0, lng: () => 0 }),
311+
});
312+
313+
const algorithm = new SuperClusterViewportAlgorithm({});
314+
315+
const cluster1 = [
316+
new Cluster({
317+
markers: [markers[0]],
318+
position: { lat: 2, lng: 2 },
319+
}),
320+
new Cluster({
321+
markers: [markers[1]],
322+
position: { lat: 8, lng: 8 },
323+
}),
324+
];
325+
326+
algorithm.cluster = jest.fn().mockReturnValueOnce(cluster1);
327+
328+
const result1 = algorithm.calculate({
329+
markers,
330+
map,
331+
mapCanvasProjection,
332+
});
333+
expect(result1.changed).toBeTruthy();
334+
335+
const cluster2 = [
336+
new Cluster({
337+
markers: [markers[0]],
338+
position: { lat: 2, lng: 2 },
339+
}),
340+
new Cluster({
341+
markers: [markers[1]],
342+
position: { lat: 8, lng: 8 },
343+
}),
344+
];
345+
346+
algorithm.cluster = jest.fn().mockReturnValueOnce(cluster2);
347+
348+
const result2 = algorithm.calculate({
349+
markers,
350+
map,
351+
mapCanvasProjection,
352+
});
353+
expect(result2.changed).toBeFalsy();
354+
355+
const cluster3 = [
356+
new Cluster({
357+
markers: markers,
358+
position: { lat: 5, lng: 5 },
359+
}),
360+
];
361+
362+
algorithm.cluster = jest.fn().mockReturnValueOnce(cluster3);
363+
364+
const result3 = algorithm.calculate({
365+
markers,
366+
map,
367+
mapCanvasProjection,
368+
});
369+
expect(result3.changed).toBeTruthy();
370+
});
371+
372+
test("should correctly calculate viewport state with getPaddedViewport", () => {
373+
const markers: Marker[] = [new markerClass()];
374+
375+
map.getZoom = jest.fn().mockReturnValue(10);
376+
377+
const northEast = {
378+
lat: jest.fn().mockReturnValue(10),
379+
lng: jest.fn().mockReturnValue(20),
380+
};
381+
const southWest = {
382+
lat: jest.fn().mockReturnValue(0),
383+
lng: jest.fn().mockReturnValue(10),
384+
};
385+
386+
const bounds = {
387+
getNorthEast: jest.fn().mockReturnValue(northEast),
388+
getSouthWest: jest.fn().mockReturnValue(southWest),
389+
};
390+
map.getBounds = jest.fn().mockReturnValue(bounds);
391+
392+
const algorithm = new SuperClusterViewportAlgorithm({
393+
viewportPadding: 60,
394+
});
395+
algorithm.cluster = jest.fn().mockReturnValue([]);
396+
397+
const result = algorithm.calculate({
398+
markers,
399+
map,
400+
mapCanvasProjection,
401+
});
402+
403+
const state = algorithm["state"];
404+
405+
expect(state.view).toEqual([0, 0, 0, 0]);
406+
expect(state.zoom).toBe(10);
407+
});
212408
}
213409
);

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