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Extent | API Reference | ArcGIS API for JavaScript 3.46

require(["esri/geometry/Extent"], function(Extent) { /* code goes here */ });

(Added at v1.0)

The minimum and maximum X- and Y- coordinates of a bounding box.

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that use this class.

esri/geometry/Geometry
|_esri/geometry/Extent

Constructor Details

Creates a new Extent object. The coordinates represent the lower left and upper right corners of the bounding box. A spatial reference is also required.

require([
  "esri/geometry/Extent", "esri/SpatialReference", ... 
], function(Extent, SpatialReference, ... ) {
  var extent = new Extent(-122.68,45.53,-122.45,45.60, new SpatialReference({ wkid:4326 }));
  ...
});

Creates a new Extent object using a JSON object.

require([
  "esri/geometry/Extent", ... 
], function(Extent, ... ) {
  var extent = new esri.geometry.Extent({
    "xmin":-122.68,"ymin":45.53,"xmax":-122.45,"ymax":45.6,
    "spatialReference":{"wkid":4326}
  });
  ...
});

Property Details

The cache is used to store values computed from geometries that need to cleared or recomputed upon mutation. An example is the extent of a polygon. The default value is undefined. (Added at v3.13)

Default value: undefined

var map;

require([
  "esri/InfoTemplate",
  "esri/layers/FeatureLayer",
  "esri/map",
  "esri/tasks/query", "dojo/domReady!"
], function (InfoTemplate, FeatureLayer, Map, Query){

  map = new Map("map", {
    basemap: "topo-vector",
    center: [-122.45, 37.75], // longitude, latitude
    zoom: 9
  });

  var infoTemplate = new InfoTemplate("Attributes", "${*}");

  var countiesFeatureLayer = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/3",
    {
      mode: FeatureLayer.MODE_ONDEMAND,
      infoTemplate: infoTemplate,
      outFields: ['*']
    });
  var highwaysFeatureLayer = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/1",
    {
      mode: FeatureLayer.MODE_ONDEMAND,
      infoTemplate: infoTemplate,
      outFields: ['*']
    });

  map.on("load", function (){
    map.addLayer(countiesFeatureLayer);
    map.addLayer(highwaysFeatureLayer);

    var query = new Query();
    query.geometry = map.extent;
    query.spatialRelationship = Query.SPATIAL_REL_ENVELOPEINTERSECTS;
    query.returnGeometry = true;
    query.outFields = ["*"];

    countiesFeatureLayer.queryFeatures(query, function (featureSet){
      var polygon = featureSet.features[0].geometry;
      // populate the Geometry cache by calling getExtent()
      var polygonExtent = polygon.getExtent();
      console.log("polygonExtent", polygonExtent);
      console.log("polygon.cache._extent", polygon.cache._extent);

      for (var i = 0; i < featureSet.features.length; i  ) {
        var feature = featureSet.features[i];
        console.log("Polygon geometry cache, %o", feature.geometry.cache);
        feature.geometry.clearCache();
        console.log("Polygon geometry clear cache, %o", feature.geometry.cache);
        // Break out of the loop after the first result
        break;
      }
    });

    highwaysFeatureLayer.queryFeatures(query, function (featureSet){
      var line = featureSet.features[0].geometry;
      // populate the Geometry cache by calling getExtent()
      var lineExtent = line.getExtent();
      console.log("lineExtent", lineExtent);
      console.log("line.cache._extent", line.cache._extent);

      for (var i = 0; i < featureSet.features.length; i  ) {
        var feature = featureSet.features[i];
        console.log("Line geometry cache, %o", feature.geometry.cache);
        feature.geometry.clearCache();
        console.log("Line geometry clear cache, %o", feature.geometry.cache);
        // Break out of the loop after the first result
        break;
      }
    });

  });
});

The type of geometry.

Known values: point | multipoint | polyline | polygon | extent

Top-right X-coordinate of an extent envelope.

Bottom-left X-coordinate of an extent envelope.

Top-right Y-coordinate of an extent envelope.

Bottom-left Y-coordinate of an extent envelope.

Method Details

A new extent is returned with the same width and height centered at the argument point.

Sets the cache property to undefined. (Added at v3.13)

When "true", the geometry in the argument is contained in this extent.

var extent = map.extent;

if(extent.contains(graphic.geometry)) {

  graphic.setSymbol(highlightSymbol);

}

Expands the extent by the factor given. For example, a value of 1.5 will be 50% bigger.

map.setExtent(points.getExtent().expand(3));

Returns the value for a named property stored in the cache. (Added at v3.13)

Returns the center point of the extent in map units.

Distance between ymin and ymax.

Distance between xmin and xmax.

Returns the intersection extent if the input geometry is an extent that intersects this extent. Boolean is returned when passing in non-Extent geometry types.

var polygonExtent = polygon.getExtent();
if (polygonExtent.intersects(map.extent)) {
  alert("Polygon intersects current map extent");
}

Returns an array with either one Extent that's been shifted to within +/- 180 or two Extents if the original extent intersects the dateline. (Added at v3.12)

Returns a new Extent with x and y offsets. Units are map units.

Sets the value for a named property stored in the cache. (Added at v3.13)

Sets the spatial reference.

Returns an extent with a spatial reference with a custom shifted central meridian if the extent intersects the dateline. (Added at v3.12)

Expands this extent to include the extent of the argument.

Updates this extent with the specified parameters.

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