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Polyline | API Reference | ArcGIS API for JavaScript 3.46

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

(Added at v1.0)

An array of paths where each path is an array of points.

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that use this class.

esri/geometry/Geometry
|_esri/geometry/Polyline

Constructor Details

Creates a new Polyline object.

require([
  "esri/geometry/Polyline", "esri/SpatialReference", ... 
], function(Polyline, SpatialReference, ... ) {
  new Polyline(new SpatialReference({wkid:4326}));
  ...
});

Creates a new Polyline object using a JSON object.

require([
  "esri/geometry/Polyline", ... 
], function(Polyline, ... ) {
  var polylineJson = {
    "paths":[[[-122.68,45.53], [-122.58,45.55],
    [-122.57,45.58],[-122.53,45.6]]],
    "spatialReference":{"wkid":4326}
  };

  var polyline = new Polyline(polylineJson);
  ...
});

Create a new polyline by providing an array of geographic coordinates. For a single path polyline provide an array of coordinate pairs. For a multi-path polyline provide an array of array coordinate pairs. (Added at v3.6)

var singlePathPolyline = new Polyline([[-50, 0], [-120, -20], [-130, 0]]);

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;
      }
    });

  });
});

An array of paths. Each path is made up of an array of two or more points.

The type of geometry.

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

Method Details

Adds a path to the Polyline. When added the index of the path is incremented by one.

require([
  "esri/geometry/Point", ... 
], function(Point, ... ) {

Adding a path using Points:

  polyline.addPath([new Point(10,10), new Point(20,20), new Point(30,30)]);

Adding a path using an array of x,y coordinate pairs:

  polyline.addPath([[-122.68,45.53], [-122.58,45.55],  [-122.57,45.58],[-122.53,45.60]]);
  ...
});

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

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

Returns the extent of the Polyline.

Returns a point specified by a path and point in the path.

Inserts a new point into a polyline. (Added at v1.4)

Removes a path from the Polyline. The index specifies which path to remove.

Remove a point from the polyline at the given pointIndex within the path identified by the given pathIndex. (Added at v2.0)

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

Updates a point in a polyline. (Added at v1.4)

Sets the spatial reference.

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