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HTML 

              
                <html>

<head>
	<meta charset="utf-8" />
	<meta name="viewport" content="initial-scale=1,
      maximum-scale=1,user-scalable=no" />

	<title>
		FeatureLayerView - query statistics by geometry | Sample | ArcGIS API for
		JavaScript 4.24
	</title>

	<link rel="stylesheet" href="https://js.arcgis.com/4.24/esri/themes/light/main.css" />
	<style>
		html,
		body,
		#viewDiv {
			padding: 0;
			margin: 0;
			height: 100%;
			width: 100%;
			overflow: hidden;
		}
	</style>
	<!-- Load the Chart.js library -->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
	<script src="https://js.arcgis.com/4.24/"></script>

	<script>
		require([
			"esri/widgets/Sketch/SketchViewModel",
			"esri/geometry/Polyline",
			"esri/geometry/Point",
			"esri/Graphic",
			"esri/Map",
			"esri/views/MapView",
			"esri/layers/FeatureLayer",
			"esri/layers/GraphicsLayer",
			"esri/geometry/geometryEngine",
			"esri/widgets/Expand",
			"esri/widgets/Legend",
			"esri/widgets/Search",
			"esri/core/reactiveUtils",
			"esri/core/promiseUtils",
			"esri/core/reactiveUtils"
		], function(
			SketchViewModel,
			Polyline,
			Point,
			Graphic,
			Map,
			MapView,
			FeatureLayer,
			GraphicsLayer,
			geometryEngine,
			Expand,
			Legend,
			Search,
			reactiveUtils,
			promiseUtils,
			reactiveUtils
		) {
			// App 'globals'
			let sketchViewModel;
			let count = 0,
				centerGraphic,
				edgeGraphic,
				polylineGraphic,
				bufferGraphic,
				centerGeometryAtStart,
				labelGraphic;
			const unit = "kilometers";
			// Create layers
			const graphicsLayer = new GraphicsLayer();
			const bufferLayer = new GraphicsLayer({
				blendMode: "color-burn"
			});
			// Create map
			const map = new Map({
				basemap: "dark-gray-vector",
				layers: [bufferLayer, graphicsLayer]
			});
			// Create view
			const view = new MapView({
				container: "viewDiv",
				map: map,
				zoom: 11,
				center: [-122.083, 37.3069],
				constraints: {
					maxScale: 0,
					minScale: 300000
				}
			});

			let handle = view.on("click", function(evt) {
				drawBufferPolygon(evt.screenPoint);
			});
			/*********************************************************************
				* Edge or center graphics are being moved. Recalculate the buffer with
				* updated geometry information and run the query stats again.
				*********************************************************************/
			const onMove = promiseUtils.debounce((event) => {
				// If the edge graphic is moving, keep the center graphic
				// at its initial location. Only move edge graphic
				if (
					event.toolEventInfo &&
					event.toolEventInfo.mover.attributes.edge
				) {
					const toolType = event.toolEventInfo.type;
					if (toolType === "move-start") {
						centerGeometryAtStart = centerGraphic.geometry;
					}
					// keep the center graphic at its initial location when edge point is moving
					else if (toolType === "move" || toolType === "move-stop") {
						centerGraphic.geometry = centerGeometryAtStart;
					}
				}
				// the center or edge graphic is being moved, recalculate the buffer
				const vertices = [
					[centerGraphic.geometry.x, centerGraphic.geometry.y],
					[edgeGraphic.geometry.x, edgeGraphic.geometry.y]
				];
				// client-side stats query of features that intersect the buffer
				calculateBuffer(vertices);
				// user is clicking on the view... call update method with the center and edge graphics
				if (event.state === "complete") {
					sketchViewModel.update([edgeGraphic, centerGraphic], {
						tool: "move"
					});
				}
			});
			/*****************************************************************
				* Create SketchViewModel and wire up event listeners
				*****************************************************************/
			sketchViewModel = new SketchViewModel({
				view: view,
				layer: graphicsLayer
			});
			// Listen to SketchViewModel's update event so that population pyramid chart
			// is updated as the graphics are updated
			sketchViewModel.on("update", onMove);
			/*********************************************************************
				* Edge or center point is being updated. Recalculate the buffer with
				* updated geometry information.
				*********************************************************************/
			function calculateBuffer(vertices) {
				// Update the geometry of the polyline based on location of edge and center points
				polylineGraphic.geometry = new Polyline({
					paths: vertices,
					spatialReference: view.spatialReference
				});
				// Recalculate the polyline length and buffer polygon
				const length = geometryEngine.geodesicLength(
					polylineGraphic.geometry,
					unit
				);
				const buffer = geometryEngine.geodesicBuffer(
					centerGraphic.geometry,
					length,
					unit
				);
				// Update the buffer polygon
				bufferGraphic.geometry = buffer;
				// Update label graphic to show the length of the polyline
				labelGraphic.geometry = edgeGraphic.geometry;
				labelGraphic.symbol = {
					type: "text",
					color: "#FFEB00",
					text: length.toFixed(2) + " kilometers",
					xoffset: 50,
					yoffset: 10,
					font: {
						// autocast as Font
						size: 14,
						family: "sans-serif"
					}
				};
			}
			var element = document.createElement('div');
			element.className = "esri-icon-trash esri-widget--button esri-widget esri-interactive";
			element.addEventListener('click', function(evt) {
				if (sketchViewModel) {
					sketchViewModel.complete();
					// sketchViewModel.delete();
					// graphicsLayer.removeAll(); // don't do this
					bufferLayer.removeAll();
					view.graphics.removeAll();
				}
			})
			sketchViewModel.on("update", ({state}) => {
				console.log("state", state)
				if (state === "complete") {
					handle.remove();
					sketchViewModel.delete();
					// graphicsLayer.removeAll(); // don't do this
				}
			});
			view.ui.add(element, "top-right");
			/***************************************************
				* Draw the buffer polygon when application loads or
				* when user searches for a new location
				**************************************************/
			function drawBufferPolygon(screenPoint) {
				// When pause() is called on the watch handle, the callback represented by the
				// watch is no longer invoked, but is still available for later use
				// this watch handle will be resumed when user searches for a new location
				// pausableWatchHandle.pause();
				paused = false;
				// Initial location for the center, edge and polylines on the view
				//const viewCenter = mapPoint.clone();
				const centerScreenPoint = screenPoint;
				const centerPoint = view.toMap({
					x: centerScreenPoint.x,
					y: centerScreenPoint.y
				});
				const edgePoint = view.toMap({
					x: centerScreenPoint.x + 24,
					y: centerScreenPoint.y - 12
				});
				// Store updated vertices
				const vertices = [
					[centerPoint.x, centerPoint.y],
					[edgePoint.x, edgePoint.y]
				];
				// Create center, edge, polyline and buffer graphics for the first time
				if (!centerGraphic) {
					const polyline = new Polyline({
						paths: vertices,
						spatialReference: view.spatialReference
					});
					// get the length of the initial polyline and create buffer
					const length = geometryEngine.geodesicLength(polyline, unit);
					const buffer = geometryEngine.geodesicBuffer(
						centerPoint,
						length,
						unit
					);
					// Create the graphics representing the line and buffer
					const pointSymbol = {
						type: "simple-marker",
						style: "circle",
						size: 10,
						color: [0, 255, 255, 0.5]
					};
					centerGraphic = new Graphic({
						geometry: centerPoint,
						symbol: pointSymbol,
						attributes: {
							center: "center"
						}
					});
					edgeGraphic = new Graphic({
						geometry: edgePoint,
						symbol: pointSymbol,
						attributes: {
							edge: "edge"
						}
					});
					polylineGraphic = new Graphic({
						geometry: polyline,
						symbol: {
							type: "simple-line",
							color: [254, 254, 254, 1],
							width: 2.5
						}
					});
					bufferGraphic = new Graphic({
						geometry: buffer,
						symbol: {
							type: "simple-fill",
							color: [150, 150, 150],
							outline: {
								color: "#FFEB00",
								width: 2
							}
						}
					});
					labelGraphic = labelLength(edgePoint, length);
					// Add graphics to layer used with sketchVM
					graphicsLayer.addMany([
						centerGraphic,
						edgeGraphic,
						// polylineGraphic
					]);
					// Add label to view graphics
					view.graphics.add(labelGraphic);
					view.graphics.add(polylineGraphic);
					// once center and edge point graphics are added to the layer,
					// call sketch's update method pass in the graphics so that users
					// can just drag these graphics to adjust the buffer
					sketchViewModel.update([edgeGraphic, centerGraphic], {
						tool: "move"
					});
					bufferLayer.addMany([bufferGraphic]);
				}
				// Move the center and edge graphics to the new location returned from search
				else {
					centerGraphic.geometry = centerPoint;
					edgeGraphic.geometry = edgePoint;
				}
				// Query features that intersect the buffer
				calculateBuffer(vertices);
			}
			// Label polyline with its length
			function labelLength(geom, length) {
				return new Graphic({
					geometry: geom,
					symbol: {
						type: "text",
						color: "#FFEB00",
						text: length.toFixed(2) + " kilometers",
						xoffset: 50,
						yoffset: 10,
						font: {
							// autocast as Font
							size: 14,
							family: "sans-serif"
						}
					}
				});
			}
		});
	</script>
</head>

<body>
	<div id="viewDiv">
	</div>
</body>

</html>
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