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Create circles

Description

Create geodesic or planar circles using the esri/geometry/Circle module (added at version 3.8 of the JS API).

Code

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>Create circles</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.22/esri/css/esri.css">
    <style>
      html, body, #map {
        height: 100%; width: 100%; margin: 0; padding: 0; 
      }
      #controls {
        background: #fff;
        box-shadow: 0 6px 6px -6px #999;
        color: #444;
        font-family: sans-serif;
        height: auto;
        left: 1em;
        padding: 1em;
        position: absolute;
        top: 1em;
        width: auto;
        z-index: 40;
      }
      #controls div {
        padding: 0 0 1em 0;
      }
    </style>

    <script src="https://js.arcgis.com/3.22/"></script>
    <script>
      var map;
    
      require([
        "esri/map", "esri/geometry/Circle", "esri/symbols/SimpleFillSymbol", 
        "esri/graphic", "esri/layers/GraphicsLayer",
        "dojo/dom", "dojo/dom-attr", "dojo/domReady!"
      ], function(
        Map, Circle, SimpleFillSymbol, 
        Graphic, GraphicsLayer, 
        dom, domAttr
      ) {
        map = new Map("map", {
          basemap: "streets",
          center: [-120.741, 56.39],
          slider: false,
          zoom: 6
        });
        var symbol = new SimpleFillSymbol().setColor(null).outline.setColor("blue");
        var gl = new GraphicsLayer({ id: "circles" });
        var geodesic = dom.byId("geodesic");
        map.addLayer(gl);
        map.on("click", function(e) {
          var radius = map.extent.getWidth() / 10;
          var circle = new Circle({
            center: e.mapPoint,
            geodesic: domAttr.get(geodesic, "checked"),
            radius: radius
          });
          var graphic = new Graphic(circle, symbol);
          gl.add(graphic);
        });
      });
    </script>
  </head>
  <body>
    <div id="map"></div>
    <div id="controls">
      <div>Click the map.</div>
      <input type="checkbox" id="geodesic">
      <label for="geodesic">Geodesic?</label>
    </div>
  </body>
</html>