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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 with visual variables | Sample | ArcGIS API for JavaScript 4.20</title>
<link rel="stylesheet" href="https://js.arcgis.com/4.20/esri/themes/light/main.css" />
<script src="https://js.arcgis.com/4.20/"></script>
<style>
html, body, #viewDiv {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
background-color: white;
}
#infoDiv {
background: white;
padding: 10px;
}
</style>
<script>
require([
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
"esri/widgets/Legend",
"esri/widgets/Expand"
], (Map, MapView, FeatureLayer, Legend, Expand
) => {
// Displays each weather station with three variables:
// Rotation - indicates wind direction
// Color - indicates air temperature
// Size - indicates wind speed
const renderer = {
type: "simple", // autocasts as new SimpleRenderer()
symbol: {
type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
// Arrow marker
path: "M14.5,29 23.5,0 14.5,9 5.5,0z",
color: [50, 50, 50],
outline: {
color: [0, 0, 0, 0.7],
width: 0.5
},
angle: 180,
size: 15
},
visualVariables: [
{
type: "rotation",
// Use {cluster_avg_WIND_DIRECT} in the
// featureReudction.popupTemplate to
// display the average temperature of all
// features within the cluster
field: "WIND_DIRECT",
rotationType: "geographic"
},
{
type: "size",
// Use {cluster_avg_WIND_SPEED} in the
// featureReudction.popupTemplate to
// display the average temperature of all
// features within the cluster
field: "WIND_SPEED",
minDataValue: 0,
maxDataValue: 60,
minSize: 8,
maxSize: 40
},
{
type: "color",
// Use {cluster_avg_TEMP} in the
// featureReudction.popupTemplate to
// display the average temperature of all
// features within the cluster
field: "TEMP",
stops: [
{ value: 20, color: "#2b83ba" },
{ value: 35, color: "#abdda4" },
{ value: 50, color: "#ffffbf" },
{ value: 65, color: "#fdae61" },
{ value: 80, color: "#d7191c" }
]
}
]
};
// Configures clustering on the layer including
// a popupTemplate referring to aggregate fields
// that summarize the values of the fields used
// to render the cluster graphics.
const clusterConfig = {
type: "cluster",
popupTemplate: {
content: [{
type: "text",
text: "This cluster represents <b>{cluster_count}</b> weather stations."
}, {
type: "fields",
fieldInfos: [{
fieldName: "cluster_avg_WIND_SPEED",
label: "Average wind speed (km/h)",
format: {
places: 0
}
}, {
fieldName: "cluster_avg_WIND_DIRECT",
label: "Average wind direction (degrees)",
format: {
places: 0
}
}, {
fieldName: "cluster_avg_TEMP",
label: "Average temperature (°F)",
format: {
places: 0
}
}]
}]
}
};
const layer = new FeatureLayer({
portalItem: {
id: "cb1886ff0a9d4156ba4d2fadd7e8a139"
},
renderer,
featureReduction: clusterConfig
});
// Layer used only for geographic context
const baseLayer = new FeatureLayer({
portalItem: {
id: "2b93b06dc0dc4e809d3c8db5cb96ba69"
},
legendEnabled: false,
popupEnabled: false,
renderer: {
type: "simple",
symbol: {
type: "simple-fill",
color: [200, 200, 200, 0.75],
outline: {
color: "white",
width: 0.5
}
}
}
});
const map = new Map({
layers: [baseLayer, layer]
});
const spatialReference = {
wkid: 54036
};
const view = new MapView({
container: "viewDiv",
map,
center: {
x: 0,
y: 0,
spatialReference: spatialReference
},
spatialReference: spatialReference,
scale: 100000000,
constraints: {
rotationEnabled: false
},
graphics: [
{
symbol: {
type: "simple-fill",
color: null,
outline: {
width: 1,
color: [200, 200, 200, 0.75]
}
},
geometry: {
type: "extent",
xmin: -180,
xmax: 180,
ymin: -90,
ymax: 90,
spatialReference: { wkid: 4326 }
}
}
]
});
const legend = new Legend({
view: view,
container: "legendDiv"
});
const infoDiv = document.getElementById("infoDiv");
view.ui.add(new Expand({
view: view,
content: infoDiv,
expandIconClass: "esri-icon-layer-list",
expanded: true
}), "top-right");
const toggleButton = document.getElementById("toggle-cluster");
toggleButton.addEventListener("click", toggleClustering);
// To turn off clustering on a layer, set the
// featureReduction property to null
function toggleClustering () {
let fr = layer.featureReduction;
layer.featureReduction = (fr && fr.type === "cluster") ? null : clusterConfig;
toggleButton.innerText = toggleButton.innerText === "Enable Clustering" ? "Disable Clustering" : "Enable Clustering";
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
<div id="infoDiv" class="esri-widget">
<button id="toggle-cluster" class="esri-button">Disable Clustering</button>
<div id="legendDiv"></div>
</div>
</body>
</html>
)