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RiverRegulation/common/plugin/map/ol/v6.12.0/examples/clusters-dynamic.html

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<h4 id="title">Dynamic clusters</h4>
<p class="tags">
<span class="badge-group">
<a
href="./index.html?q=marker" class="badge badge-info">marker</a
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class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="marker"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-icon.html&quot;&gt;Icon modification&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;"
tabindex="0"
>5</a>
</span>
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<a
href="./index.html?q=cluster" class="badge badge-info">cluster</a
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class="badge badge-info tag-modal-toggle text-white"
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data-target="#tag-example-list"
data-title="cluster"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cluster.html&quot;&gt;Clustered Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;"
tabindex="0"
>3</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=vector" class="badge badge-info">vector</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="vector"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-tiles-advanced.html&quot;&gt;Advanced Mapbox Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cluster.html&quot;&gt;Clustered Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-hit-detection-renderer.html&quot;&gt;Custom Hit Detection Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./polygon-styles.html&quot;&gt;Custom Polygon Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./drag-and-drop-image-vector.html&quot;&gt;Drag-and-Drop Image Vector&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-features.html&quot;&gt;Draw and Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-and-modify-geodesic.html&quot;&gt;Draw and Modify Geodesic Circles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-features.html&quot;&gt;Draw Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-shapes.html&quot;&gt;Draw Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-earthquakes.html&quot;&gt;Earthquakes in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-custom-symbol.html&quot;&gt;Earthquakes with custom symbols&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./fractal.html&quot;&gt;Fractal Rendering&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./draw-freehand.html&quot;&gt;Freehand Drawing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./geojson.html&quot;&gt;GeoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./geojson-vt.html&quot;&gt;geojson-vt integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-icon.html&quot;&gt;Icon modification&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./jsts.html&quot;&gt;JSTS Integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./line-arrows.html&quot;&gt;LineString Arrows&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-layer.html&quot;&gt;Mapbox Vector Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-vector-tiles.html&quot;&gt;Mapbox Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-layer.html&quot;&gt;Mapbox-gl Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure.html&quot;&gt;Measure&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-features.html&quot;&gt;Modify Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-test.html&quot;&gt;Modify Features Test&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./ogc-vector-tiles.html&quot;&gt;OGC Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./osm-vector-tiles.html&quot;&gt;OSM Vector Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-osm.html&quot;&gt;OSM XML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./regularshape.html&quot;&gt;Regular Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-scale-and-rotate.html&quot;&gt;Scale and Rotate using Modify Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-features.html&quot;&gt;Select Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-hover-features.html&quot;&gt;Select Features by Hover&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./select-multiple-features.html&quot;&gt;Select multiple Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./snap.html&quot;&gt;Snap Interaction&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./street-labels.html&quot;&gt;Street Labels&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./style-renderer.html&quot;&gt;Style renderer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./synthetic-lines.html&quot;&gt;Synthetic Lines&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./synthetic-points.html&quot;&gt;Synthetic Points&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-timezones.html&quot;&gt;Timezones in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topojson.html&quot;&gt;TopoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topolis.html&quot;&gt;topolis integration&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./tracing.html&quot;&gt;Tracing around a polygon&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./turf.html&quot;&gt;turf.js&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-clipping-vector.html&quot;&gt;Vector Clipping Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./image-vector-layer.html&quot;&gt;Vector Image Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-label-decluttering.html&quot;&gt;Vector Label Decluttering&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-labels.html&quot;&gt;Vector Labels&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-layer.html&quot;&gt;Vector Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./hitdetect-vector.html&quot;&gt;Vector Layer Hit Detection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs.html&quot;&gt;WFS&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-getfeature.html&quot;&gt;WFS - GetFeature&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-geographic.html&quot;&gt;WFS with geographic coordinates&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wind-arrows.html&quot;&gt;Wind Arrows&lt;/a&gt;"
tabindex="0"
>68</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=style" class="badge badge-info">style</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="style"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./polygon-styles.html&quot;&gt;Custom Polygon Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-earthquakes.html&quot;&gt;Earthquakes in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-custom-symbol.html&quot;&gt;Earthquakes with custom symbols&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./regularshape.html&quot;&gt;Regular Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./style-renderer.html&quot;&gt;Style renderer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-timezones.html&quot;&gt;Timezones in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topojson.html&quot;&gt;TopoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wind-arrows.html&quot;&gt;Wind Arrows&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./zoomslider.html&quot;&gt;Zoom Sliders&lt;/a&gt;"
tabindex="0"
>22</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=convexhull" class="badge badge-info">convexhull</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="convexhull"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;"
tabindex="0"
>1</a>
</span>
</p>
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<button type="button" class="close" data-dismiss="modal" aria-label="Close">
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<div class="row-fluid">
<div class="span12">
<p id="shortdesc">Clusters with zoom-to-cluster, hull view, and uncluttering of overlapping features.</p>
<div id="docs"><p>This example shows open data of subsidized photovoltaic installations in Vienna. Different style functions
are used for cluster display, single feature display, convex hull of a cluster, and an expanded view of
overlapping features. Hovering over a cluster shows its convex hull. Clicking on a cluster zooms to the
extent of the contained features. Clicking on a cluster consisting of features that are very close to each other reveals an expanded view
of the features, along a circle around the cluster.</p>
<p>Features are styled differently depending on the power of the photovoltaic installation.</p>
</div>
</div>
</div>
<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Feature from &#x27;ol/Feature&#x27;;
import GeoJSON from &#x27;ol/format/GeoJSON&#x27;;
import Map from &#x27;ol/Map&#x27;;
import View from &#x27;ol/View&#x27;;
import {
Circle as CircleStyle,
Fill,
Icon,
Stroke,
Style,
Text,
} from &#x27;ol/style&#x27;;
import {Cluster, Vector as VectorSource, XYZ} from &#x27;ol/source&#x27;;
import {LineString, Point, Polygon} from &#x27;ol/geom&#x27;;
import {Tile as TileLayer, Vector as VectorLayer} from &#x27;ol/layer&#x27;;
import {createEmpty, extend, getWidth} from &#x27;ol/extent&#x27;;
import {fromLonLat} from &#x27;ol/proj&#x27;;
const circleDistanceMultiplier &#x3D; 1;
const circleFootSeparation &#x3D; 28;
const circleStartAngle &#x3D; Math.PI / 2;
const convexHullFill &#x3D; new Fill({
color: &#x27;rgba(255, 153, 0, 0.4)&#x27;,
});
const convexHullStroke &#x3D; new Stroke({
color: &#x27;rgba(204, 85, 0, 1)&#x27;,
width: 1.5,
});
const outerCircleFill &#x3D; new Fill({
color: &#x27;rgba(255, 153, 102, 0.3)&#x27;,
});
const innerCircleFill &#x3D; new Fill({
color: &#x27;rgba(255, 165, 0, 0.7)&#x27;,
});
const textFill &#x3D; new Fill({
color: &#x27;#fff&#x27;,
});
const textStroke &#x3D; new Stroke({
color: &#x27;rgba(0, 0, 0, 0.6)&#x27;,
width: 3,
});
const innerCircle &#x3D; new CircleStyle({
radius: 14,
fill: innerCircleFill,
});
const outerCircle &#x3D; new CircleStyle({
radius: 20,
fill: outerCircleFill,
});
const darkIcon &#x3D; new Icon({
src: &#x27;data/icons/emoticon-cool.svg&#x27;,
});
const lightIcon &#x3D; new Icon({
src: &#x27;data/icons/emoticon-cool-outline.svg&#x27;,
});
/**
* Single feature style, users for clusters with 1 feature and cluster circles.
* @param {Feature} clusterMember A feature from a cluster.
* @return {Style} An icon style for the cluster member&#x27;s location.
*/
function clusterMemberStyle(clusterMember) {
return new Style({
geometry: clusterMember.getGeometry(),
image: clusterMember.get(&#x27;LEISTUNG&#x27;) &gt; 5 ? darkIcon : lightIcon,
});
}
let clickFeature, clickResolution;
/**
* Style for clusters with features that are too close to each other, activated on click.
* @param {Feature} cluster A cluster with overlapping members.
* @param {number} resolution The current view resolution.
* @return {Style} A style to render an expanded view of the cluster members.
*/
function clusterCircleStyle(cluster, resolution) {
if (cluster !&#x3D;&#x3D; clickFeature || resolution !&#x3D;&#x3D; clickResolution) {
return;
}
const clusterMembers &#x3D; cluster.get(&#x27;features&#x27;);
const centerCoordinates &#x3D; cluster.getGeometry().getCoordinates();
return generatePointsCircle(
clusterMembers.length,
cluster.getGeometry().getCoordinates(),
resolution
).reduce((styles, coordinates, i) &#x3D;&gt; {
const point &#x3D; new Point(coordinates);
const line &#x3D; new LineString([centerCoordinates, coordinates]);
styles.unshift(
new Style({
geometry: line,
stroke: convexHullStroke,
})
);
styles.push(
clusterMemberStyle(
new Feature({
...clusterMembers[i].getProperties(),
geometry: point,
})
)
);
return styles;
}, []);
}
/**
* From
* https://github.com/Leaflet/Leaflet.markercluster/blob/31360f2/src/MarkerCluster.Spiderfier.js#L55-L72
* Arranges points in a circle around the cluster center, with a line pointing from the center to
* each point.
* @param {number} count Number of cluster members.
* @param {Array&lt;number&gt;} clusterCenter Center coordinate of the cluster.
* @param {number} resolution Current view resolution.
* @return {Array&lt;Array&lt;number&gt;&gt;} An array of coordinates representing the cluster members.
*/
function generatePointsCircle(count, clusterCenter, resolution) {
const circumference &#x3D;
circleDistanceMultiplier * circleFootSeparation * (2 + count);
let legLength &#x3D; circumference / (Math.PI * 2); //radius from circumference
const angleStep &#x3D; (Math.PI * 2) / count;
const res &#x3D; [];
let angle;
legLength &#x3D; Math.max(legLength, 35) * resolution; // Minimum distance to get outside the cluster icon.
for (let i &#x3D; 0; i &lt; count; ++i) {
// Clockwise, like spiral.
angle &#x3D; circleStartAngle + i * angleStep;
res.push([
clusterCenter[0] + legLength * Math.cos(angle),
clusterCenter[1] + legLength * Math.sin(angle),
]);
}
return res;
}
let hoverFeature;
/**
* Style for convex hulls of clusters, activated on hover.
* @param {Feature} cluster The cluster feature.
* @return {Style} Polygon style for the convex hull of the cluster.
*/
function clusterHullStyle(cluster) {
if (cluster !&#x3D;&#x3D; hoverFeature) {
return;
}
const originalFeatures &#x3D; cluster.get(&#x27;features&#x27;);
const points &#x3D; originalFeatures.map((feature) &#x3D;&gt;
feature.getGeometry().getCoordinates()
);
return new Style({
geometry: new Polygon([monotoneChainConvexHull(points)]),
fill: convexHullFill,
stroke: convexHullStroke,
});
}
function clusterStyle(feature) {
const size &#x3D; feature.get(&#x27;features&#x27;).length;
if (size &gt; 1) {
return [
new Style({
image: outerCircle,
}),
new Style({
image: innerCircle,
text: new Text({
text: size.toString(),
fill: textFill,
stroke: textStroke,
}),
}),
];
} else {
const originalFeature &#x3D; feature.get(&#x27;features&#x27;)[0];
return clusterMemberStyle(originalFeature);
}
}
const vectorSource &#x3D; new VectorSource({
format: new GeoJSON(),
url: &#x27;data/geojson/photovoltaic.json&#x27;,
});
const clusterSource &#x3D; new Cluster({
attributions:
&#x27;Data: &lt;a href&#x3D;&quot;https://www.data.gv.at/auftritte/?organisation&#x3D;stadt-wien&quot;&gt;Stadt Wien&lt;/a&gt;&#x27;,
distance: 35,
source: vectorSource,
});
// Layer displaying the convex hull of the hovered cluster.
const clusterHulls &#x3D; new VectorLayer({
source: clusterSource,
style: clusterHullStyle,
});
// Layer displaying the clusters and individual features.
const clusters &#x3D; new VectorLayer({
source: clusterSource,
style: clusterStyle,
});
// Layer displaying the expanded view of overlapping cluster members.
const clusterCircles &#x3D; new VectorLayer({
source: clusterSource,
style: clusterCircleStyle,
});
const raster &#x3D; new TileLayer({
source: new XYZ({
attributions:
&#x27;Base map: &lt;a target&#x3D;&quot;_blank&quot; href&#x3D;&quot;https://basemap.at/&quot;&gt;basemap.at&lt;/a&gt;&#x27;,
url: &#x27;https://maps{1-4}.wien.gv.at/basemap/bmapgrau/normal/google3857/{z}/{y}/{x}.png&#x27;,
}),
});
const map &#x3D; new Map({
layers: [raster, clusterHulls, clusters, clusterCircles],
target: &#x27;map&#x27;,
view: new View({
center: [0, 0],
zoom: 2,
maxZoom: 19,
extent: [
...fromLonLat([16.1793, 48.1124]),
...fromLonLat([16.5559, 48.313]),
],
showFullExtent: true,
}),
});
map.on(&#x27;pointermove&#x27;, (event) &#x3D;&gt; {
clusters.getFeatures(event.pixel).then((features) &#x3D;&gt; {
if (features[0] !&#x3D;&#x3D; hoverFeature) {
// Display the convex hull on hover.
hoverFeature &#x3D; features[0];
clusterHulls.setStyle(clusterHullStyle);
// Change the cursor style to indicate that the cluster is clickable.
map.getTargetElement().style.cursor &#x3D;
hoverFeature &amp;&amp; hoverFeature.get(&#x27;features&#x27;).length &gt; 1
? &#x27;pointer&#x27;
: &#x27;&#x27;;
}
});
});
map.on(&#x27;click&#x27;, (event) &#x3D;&gt; {
clusters.getFeatures(event.pixel).then((features) &#x3D;&gt; {
if (features.length &gt; 0) {
const clusterMembers &#x3D; features[0].get(&#x27;features&#x27;);
if (clusterMembers.length &gt; 1) {
// Calculate the extent of the cluster members.
const extent &#x3D; createEmpty();
clusterMembers.forEach((feature) &#x3D;&gt;
extend(extent, feature.getGeometry().getExtent())
);
const view &#x3D; map.getView();
const resolution &#x3D; map.getView().getResolution();
if (
view.getZoom() &#x3D;&#x3D;&#x3D; view.getMaxZoom() ||
(getWidth(extent) &lt; resolution &amp;&amp; getWidth(extent) &lt; resolution)
) {
// Show an expanded view of the cluster members.
clickFeature &#x3D; features[0];
clickResolution &#x3D; resolution;
clusterCircles.setStyle(clusterCircleStyle);
} else {
// Zoom to the extent of the cluster members.
view.fit(extent, {duration: 500, padding: [50, 50, 50, 50]});
}
}
}
});
});
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;Dynamic clusters&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
&lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
&lt;script src&#x3D;&quot;https://unpkg.com/monotone-chain-convex-hull@1.0.0/lib/index.js&quot;&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;clusters-dynamic&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.12.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
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