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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>Point clustering - filter popup features | Sample | GeoScene API for JavaScript 4.22</title>
<link rel="stylesheet" href="https://js.geoscene.cn/4.23/geoscene/themes/light/main.css" />
<script src="https://js.geoscene.cn/4.23/"></script>
<style>
html,
body,
#viewDiv {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
</style>
<script>
require([
"geoscene/WebMap",
"geoscene/views/MapView",
"geoscene/layers/FeatureLayer",
"geoscene/widgets/Legend",
"geoscene/widgets/Expand",
"geoscene/smartMapping/labels/clusters"
], function (
WebMap,
MapView,
FeatureLayer,
Legend,
Expand,
clusterLabelCreator
) {
const layer = new FeatureLayer({
portalItem: {
id: "eb54b44c65b846cca12914b87b315169"
}
});
const map = new WebMap({
basemap: {
portalItem: {
id: "75a08e8cd8b64dcfa6945bb7f624ccc5"
}
},
layers: [layer]
});
const view = new MapView({
container: "viewDiv",
map,
extent: {
spatialReference: {
latestWkid: 3857,
wkid: 102100
},
xmin: -15327459,
ymin: 2740044,
xmax: -6076744,
ymax: 6878650
},
popup: {
dockEnabled: true,
dockOptions: {
breakpoint: false,
position: "top-right"
}
}
});
view.ui.add(
new Expand({
content: new Legend({ view }),
view
}),
"top-left"
);
layer
.when()
.then(generateClusterConfig)
.then(async (featureReduction) => {
// sets generated cluster configuration on the layer
layer.featureReduction = featureReduction;
// Disable clustering when user zooms beyond a 1:50,000 scale level
// Re-enable clustering when the user zooms out to a scale smaller than 1:50,000
view.watch("scale", function (scale) {
layer.featureReduction =
view.scale > 50000 ? featureReduction : null;
});
})
.catch((error) => {
console.error(error);
});
async function generateClusterConfig(layer) {
let popupTemplate = {
title: "Coal summary",
content: `<p>This cluster represents <b>{cluster_count}</b> power plants. <b>{expression/Coal-count}</b> of these plants are fueled by Coal.</p><p>Coal plants produce <b>{expression/Coal-mw-sum}</b> of the total power generated in this cluster.</p>`,
expressionInfos: [{
name: "Coal-count",
title: "Coal-count",
expression: `
// returns the total number of coal power plants
Count(Filter($aggregatedFeatures, "fuel1 = 'Coal'"))
`
}, {
name: "Coal-mw-sum",
title: "Coal-mw-sum",
expression: `
// returns the amount of electricity generated by coal
// in this cluster as a ratio to the total capacity
// of plants included in the cluster
Expects($aggregatedFeatures, "capacity_mw")
var mWtotal = Sum($aggregatedFeatures, "capacity_mw");
var mWCoal = Sum(Filter($aggregatedFeatures, "fuel1 = 'Coal'"), "capacity_mw");
if(mWCoal < 1){
return "none";
}
var mWratio = Round(mWCoal / mWtotal, 4);
return \`\${Text(mWratio, "#.#%")} (\${Text(mWCoal, "#,### mW")})\`;
`
}]
};
// generates default labelingInfo
const { labelingInfo, clusterMinSize } = await clusterLabelCreator
.getLabelSchemes({
layer,
view
})
.then((labelSchemes) => labelSchemes.primaryScheme);
return {
type: "cluster",
popupTemplate,
labelingInfo,
clusterMinSize
};
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
