ArcGIS API for javascript（4.0）开发笔记 —— view.toScreen 转换坐标

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
  <title>Get started with graphics - 4.0</title>

  <link rel="stylesheet" href="https://js.arcgis.com/4.0/esri/css/main.css">
  <script src="https://js.arcgis.com/4.0/"></script>

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

  <script>
    require([
      "esri/Map",
      "esri/views/MapView",
      "esri/Graphic",
      "esri/geometry/Point",
      "esri/symbols/SimpleMarkerSymbol",
      "dojo/domReady!"
    ], function(
            Map,
            MapView,
            Graphic,
            Point,
            SimpleMarkerSymbol
    ) {

      var map = new Map({
        basemap: "hybrid"
      });

      var view = new MapView({
        center: [-80, 35],
        container: "viewDiv",
        map: map,
        zoom: 3
      });


      var point = new Point({
        longitude: -49.97,
        latitude: 41.73
      });
      var markerSymbol = new SimpleMarkerSymbol({
        color: [226, 119, 40],
        outline: {
          color: [255, 255, 255],
          width: 2
        }
      });

      var pointGraphic = new Graphic({
        geometry: point,
        symbol: markerSymbol
      });

      view.graphics.add(pointGraphic);


      view.watch("extent", function(evt){
        var point = view.graphics.getItemAt(0);
        if(point.geometry){
          // 关键代码 点的空间参考需与地图保持一致
          point.geometry.spatialReference = view.spatialReference;
          var screenPoint = view.toScreen(point.geometry);
          var test = document.getElementById("location") ;
          test.style.top = Number(screenPoint.y) + 'px' ;
          test.style.left = Number(screenPoint.x) + 'px' ;
        }
      });
    });
  </script>
</head>

<body>
<div id="viewDiv"></div>
<div id = "location" style="position: absolute;z-index: 999;background:red;">I am here!</div>
</body>

</html>

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