CODEWITHSUNDEEP
gisarcgisarcgis-js-api
kiku
kiku

Reputation: 167

Get coodinate from each point of the polygon on ArcGIS?

I'm working with the ArcGIS API for JavaScript. I wondering is there any features I can use to get the coordinates of each vertex after I draw using the Sketch tool in the ArcGiS API?

Update

I try to use the webmercator method but it keep appear this error to me "webMercatorUtils.webMercatorToGeographic is not a function"

this is the code i written to parse it.

 sketch.on("create", (e: __esri.SketchCreateEvent) => {

    if (e.state === "complete") {
      // this.rings = e.graphic.geometry.toJSON().rings.webMercatorUtils.webMercatorToGeographic();

      this.rings = webMercatorUtils.webMercatorToGeographic(e.graphic.geometry);
    }
  });

Error

Error

Upvotes: 0

Views: 1050

Answers (1)

cabesuon
cabesuon

Reputation: 5270

Sketch widget has a series of events that you can bind to get the information you are looking for.

In your case, use create event.

ArcGIS API - Sketch

Take a look at this simple example I put for you.

<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
  <title>Sketch</title>
  <style>
    html, body, #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }
  </style>

  <link rel="stylesheet" href="https://js.arcgis.com/4.21/esri/css/main.css">
  <script src="https://js.arcgis.com/4.21/"></script>

  <script>
    require([
        "esri/widgets/Sketch",
        "esri/Map",
        "esri/layers/GraphicsLayer",
        "esri/views/MapView"
      ], (Sketch, Map, GraphicsLayer, MapView) => {
        const graphicsLayer = new GraphicsLayer();

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

        const view = new MapView({
          container: "viewDiv",
          map: map,
          zoom: 5,
          center: [90, 45]
        });

        view.when(() => {
          const sketch = new Sketch({
            layer: graphicsLayer,
            view: view
          });
          sketch.on("create", function(event) {
            if (event.state === "complete") {
              console.log(event.graphic.geometry.toJSON());
            }
          });
          view.ui.add(sketch, "top-right");
        });
      });
  </script>
</head>
<body>
  <div id="viewDiv"></div>
</body>
</html>

UPDATE

Here is the same code with the addition to convert the geometry from WebMercator (wkid 102100 or 3857) to geographics (wkid 4326)

<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
  <title>Sketch</title>
  <style>
    html, body, #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }
  </style>

  <link rel="stylesheet" href="https://js.arcgis.com/4.21/esri/css/main.css">
  <script src="https://js.arcgis.com/4.21/"></script>

  <script>
    require([
        "esri/widgets/Sketch",
        "esri/Map",
        "esri/layers/GraphicsLayer",
        "esri/views/MapView",
        "esri/geometry/support/webMercatorUtils"
      ], (Sketch, Map, GraphicsLayer, MapView, webMercatorUtils) => {
        const graphicsLayer = new GraphicsLayer();

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

        const view = new MapView({
          container: "viewDiv",
          map: map,
          zoom: 5,
          center: [90, 45]
        });

        view.when(() => {
          const sketch = new Sketch({
            layer: graphicsLayer,
            view: view
          });
          sketch.on("create", function(event) {
            if (event.state === "complete") {
              console.log(event.graphic.geometry.toJSON());
              console.log(webMercatorUtils.webMercatorToGeographic(event.graphic.geometry).toJSON());
            }
          });
          view.ui.add(sketch, "top-right");
        });
      });
  </script>
</head>
<body>
  <div id="viewDiv"></div>
</body>
</html>

Upvotes: 3

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