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renderer.ts
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renderer.ts
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/**
* Copyright 2021 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { Cluster } from "./cluster";
/**
* Provides statistics on all clusters in the current render cycle for use in {@link Renderer.render}.
*/
export class ClusterStats {
public readonly markers: { sum: number };
public readonly clusters: {
count: number;
markers: {
mean: number;
sum: number;
min: number;
max: number;
};
};
constructor(markers: google.maps.Marker[], clusters: Cluster[]) {
this.markers = { sum: markers.length };
const clusterMarkerCounts = clusters.map((a) => a.count);
const clusterMarkerSum = clusterMarkerCounts.reduce((a, b) => a + b, 0);
this.clusters = {
count: clusters.length,
markers: {
mean: clusterMarkerSum / clusters.length,
sum: clusterMarkerSum,
min: Math.min(...clusterMarkerCounts),
max: Math.max(...clusterMarkerCounts),
},
};
}
}
export interface Renderer {
/**
* Turn a {@link Cluster} into a `google.maps.Marker`.
*
* Below is a simple example to create a marker with the number of markers in the cluster as a label.
*
* ```typescript
* return new google.maps.Marker({
* position,
* label: String(markers.length),
* });
* ```
*/
render(cluster: Cluster, stats: ClusterStats): google.maps.Marker;
}
export class DefaultRenderer implements Renderer {
/**
* The default render function for the library used by {@link MarkerClusterer}.
*
* Currently set to use the following:
*
* ```typescript
* // change color if this cluster has more markers than the mean cluster
* const color =
* count > Math.max(10, stats.clusters.markers.mean)
* ? "#ff0000"
* : "#0000ff";
*
* // create svg url with fill color
* const svg = window.btoa(`
* <svg fill="${color}" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 240 240">
* <circle cx="120" cy="120" opacity=".6" r="70" />
* <circle cx="120" cy="120" opacity=".3" r="90" />
* <circle cx="120" cy="120" opacity=".2" r="110" />
* <circle cx="120" cy="120" opacity=".1" r="130" />
* </svg>`);
*
* // create marker using svg icon
* return new google.maps.Marker({
* position,
* icon: {
* url: `data:image/svg+xml;base64,${svg}`,
* scaledSize: new google.maps.Size(45, 45),
* },
* label: {
* text: String(count),
* color: "rgba(255,255,255,0.9)",
* fontSize: "12px",
* },
* // adjust zIndex to be above other markers
* zIndex: 1000 + count,
* });
* ```
*/
public render(
{ count, position }: Cluster,
stats: ClusterStats
): google.maps.Marker {
// change color if this cluster has more markers than the mean cluster
const color =
count > Math.max(10, stats.clusters.markers.mean) ? "#ff0000" : "#0000ff";
// create svg url with fill color
const svg = window.btoa(`
<svg fill="${color}" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 240 240">
<circle cx="120" cy="120" opacity=".6" r="70" />
<circle cx="120" cy="120" opacity=".3" r="90" />
<circle cx="120" cy="120" opacity=".2" r="110" />
</svg>`);
// create marker using svg icon
return new google.maps.Marker({
position,
icon: {
url: `data:image/svg+xml;base64,${svg}`,
scaledSize: new google.maps.Size(45, 45),
},
label: {
text: String(count),
color: "rgba(255,255,255,0.9)",
fontSize: "12px",
},
title: `Cluster of ${count} markers`,
// adjust zIndex to be above other markers
zIndex: Number(google.maps.Marker.MAX_ZINDEX) + count,
});
}
}