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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>Arcade profiles - line segment labeling</title>

    <link rel="stylesheet" href="https://js.arcgis.com/4.24/esri/themes/light/main.css"/>
    <script src="https://js.arcgis.com/4.24/"></script>

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }

      #titleDiv {
        max-width: 300px;
        padding: 10px;
      }
      #sketchTools{
        align-items: center;
      }
    </style>
    <script>
      require([
        "esri/widgets/Sketch",
        "esri/Map",
        "esri/Graphic",
        "esri/layers/GraphicsLayer",
        "esri/views/MapView",
        "esri/symbols/TextSymbol",
        "esri/arcade",
        "esri/widgets/Search",
        "esri/widgets/BasemapGallery"
      ], (Sketch, Map, Graphic, GraphicsLayer, MapView, TextSymbol, arcade, Search, BasemapGallery) => {
        (async () => {
          const graphicsLayer = new GraphicsLayer();
          const labelLayer = new GraphicsLayer();

          const map = new Map({
            basemap: "topo-vector",
            layers: [graphicsLayer, labelLayer]
          });

          const view = new MapView({
            container: "viewDiv",
            map: map,
            scale: 4514,
            center: [-117.4203, 47.6615 ]
          });

          view.ui.add("titleDiv", "top-right");

          await view.when();
          const sketch = new Sketch({
            layer: graphicsLayer,
            view,
            creationMode: "update",
            visibleElements: {
              createTools: {
                point: false,
                polyline: true,
                polygon: false,
                rectangle: false,
                circle: false
              },
              selectionTools: {
                "rectangle-selection": false,
                "lasso-selection": false
              },
              snappingControlsElements: {
                layerList: false
              }
            },
            container: "sketchTools"
          });

          // view.ui.add(sketch, "top-right");

          const labelSegmentProfile = {
            variables: [
              {
                name: "$feature",
                type: "feature"
              }
            ]
          };

          // Expression for calculating measurements for active line segment
          const labelSegmentExpression = `
            var paths = Geometry($feature).paths;
            var finalPath = Back(paths);
            var finalPoint = Back(finalPath);
            var previousPoint = finalPath[Count(finalPath)-2];

            var a = Angle(previousPoint, finalPoint);
            var b = Bearing(previousPoint, finalPoint);
            var c = When(
              (b < 22.5 && b >= 0) || b > 337.5, 'N',
              b >= 22.5 && b < 67.5, 'NE',
              b >= 67.5 && b < 112.5, 'E',
              b >= 112.5 && b < 157.5, 'SE',
              b >= 157.5 && b < 202.5, 'S',
              b >= 202.5 && b < 247.5, 'SW',
              b >= 247.5 && b < 292.5, 'W',
              b >= 292.5 && b < 337.5, 'NW',
              ''
            );

            var d = DistanceGeodetic(previousPoint, finalPoint, "meters");

            return {
              label: {
                text: Text(d, "#,###.#") + "m\\nBearing: " + Text(b, "#.#°") + " (" + c + ")",
                // symbol angle direction is opposite of Angle function
                angle: iif(b < 180, a * -1, a * -1 + 180),
                color: "black",
                font: {
                  family: "Orbitron",
                  style: "normal",
                  weight: "bold",
                  size: 9
                },
                haloColor: "white",
                haloSize: 1.5,
                yoffset: 4,
                xoffset: iif((b <= 180 && b > 90) || b >= 270, 4, -4),
                horizontalAlignment: "center",
                verticalAlignment: "bottom"
              },
              location: Centroid([previousPoint, finalPoint])
            };
          `;

          // Compile the expression and create an executor
          const arcadeExecutor = await arcade.createArcadeExecutor(
            labelSegmentExpression,
            labelSegmentProfile
          );

          let activeLabel = null;
          let createId = 0;

          sketch.on("create", ({ state, graphic, tool, toolEventInfo }) => {
            if(tool === "polyline" && state === "active"){

              if(labelLayer.graphics.includes(activeLabel)){

                // clear graphic on each update
                labelLayer.graphics.remove(activeLabel);
                  activeLabel = null;
                }

                graphic.attributes = {
                  lineId: createId
                };

                // create label symbol and position
                const { label, location } = arcadeExecutor.execute({
                  $feature: graphic
                });

                activeLabel = new Graphic({
                  symbol: new TextSymbol(label),
                  geometry: location,
                  attributes: {
                    lineId: createId
                  }
                });

                labelLayer.graphics.add(activeLabel);

                // start new measurement for each added vertex
                if(toolEventInfo.type === "vertex-add"){
                  activeLabel = null;
                }
              }

            if(state === "complete"){
              createId++;
            }

          });

          // Expression for labeling all segments of a previously created line
          const labelAllSegmentsExpression = `
            var paths = Geometry($feature).paths;
            var finalPath = Back(paths);

            var labels = [];

            var firstPoint;
            var lastPoint;

            for (var i in finalPath){
              if(IsEmpty(firstPoint)){
                firstPoint = finalPath[i];
                continue;
              }
              if(IsEmpty(lastPoint)){
                lastPoint = finalPath[i];

                var a = Angle(firstPoint, lastPoint);
                var b = Bearing(firstPoint, lastPoint);
                var c = When(
                  (b < 22.5 && b >= 0) || b > 337.5, 'N',
                  b >= 22.5 && b < 67.5, 'NE',
                  b >= 67.5 && b < 112.5, 'E',
                  b >= 112.5 && b < 157.5, 'SE',
                  b >= 157.5 && b < 202.5, 'S',
                  b >= 202.5 && b < 247.5, 'SW',
                  b >= 247.5 && b < 292.5, 'W',
                  b >= 292.5 && b < 337.5, 'NW',
                  null
                );

                var d = DistanceGeodetic(firstPoint, lastPoint, "meters");

                Push(labels, {
                  label: {
                    text: Text(d, "#,###.#") + "m\\nBearing: " + Text(b, "#.#°") + " (" + c + ")",
                    angle: iif(b < 180, a * -1, a * -1 + 180),
                    color: "black",
                    font: {
                      family: "Orbitron",
                      style: "normal",
                      weight: "bold",
                      size: 9
                    },
                    haloColor: "white",
                    haloSize: 1.5,
                    yoffset: 4,
                    xoffset: iif((b <= 180 && b > 90) || b >= 270, 4, -4),
                    horizontalAlignment: "center",
                    verticalAlignment: "bottom"
                  },
                  location: Centroid([firstPoint, lastPoint])
                });

                firstPoint = lastPoint;
                lastPoint = null;
              }
            }

            return labels;
          `;

          // Compile the expression and create an executor
          const labelAllSegmentsExecutor = await arcade.createArcadeExecutor(
            labelAllSegmentsExpression,
            labelSegmentProfile
          );

          sketch.on(["update", "undo", "redo"], ({ type, state, graphics, tool, toolEventInfo }) => {
            if(state === "active" || type === "undo" || type === "redo"){

              graphics.forEach(graphic => {

                const oldLabels = labelLayer.graphics.filter(label => graphic.attributes.lineId === label.attributes.lineId);
                labelLayer.graphics.removeMany(oldLabels);

                const labels = labelAllSegmentsExecutor.execute({
                  $feature: graphic
                });

                const labelGraphics = labels.map(({ label, location }) => {
                  activeLabel = new Graphic({
                    symbol: new TextSymbol(label),
                    geometry: location,
                    attributes: {
                      lineId: graphic.attributes.lineId
                    }
                  });

                  return activeLabel;
                });

                labelLayer.graphics.addMany(labelGraphics);
              });
            }


          });

          sketch.on("delete", ({ graphics }) => {
            graphics.forEach(graphic => {
              const oldLabels = labelLayer.graphics.filter(label => graphic.attributes.lineId === label.attributes.lineId);
              labelLayer.graphics.removeMany(oldLabels);
            });
          });

        })()
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
    <div id="titleDiv" class="esri-widget">
      <h1 id="title">Measure by segment</h1>
      <p>Use the sketch tools to create a line. Each line segment will be labeled with its geodesic length, bearing (compass direction), and angle from the previous point.</p>
      <div id="sketchTools"></div>
    </div>
  </body>
</html>
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