从 ArcGIS 上多边形的每个点获取坐标？

Question

我正在使用 ArcGIS API JavaScript。我想知道在使用 ArcGiS 中的草图工具绘制后，是否有任何功能可以用来获取每个顶点的坐标 API？

更新

我尝试使用 webmercator 方法，但它一直向我显示此错误 “webMercatorUtils.webMercatorToGeographic 不是一个函数”

这是我为解析它而编写的代码。

 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);
    }
  });

错误

Answer 1

Sketch 小部件有一系列事件，您可以绑定这些事件以获取您正在寻找的信息。

在你的情况下，使用 create 事件。

ArcGIS API - Sketch

看看我为您提供的这个简单示例。

<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>

更新

这是相同的代码，除了将几何图形从 WebMercator（wkid 102100 或 3857）转换为地理图形（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>

从 ArcGIS 上多边形的每个点获取坐标？

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