Polygon

Property Overview

Property Details

cache Objectreadonly inherited

The cache is used to store values computed from geometries that need to be cleared or recomputed upon mutation. An example is the extent of a polygon.

centroid Point

The centroid of the polygon. For a polygon with multiple rings, it represents the centroid of the largest ring.

declaredClass Stringreadonly inherited

Since: ArcGIS Maps SDK for JavaScript 4.7

The name of the class. The declared class name is formatted as esri.folder.className.

extent Extentreadonly inherited

The extent of the geometry. For a point, the extent is null.

hasM Boolean inherited

Indicates if the geometry has M values.

hasZ Boolean inherited

Indicates if the geometry has z-values (elevation).

Z-values defined in a geographic or metric coordinate system are expressed in meters. However, in local scenes that use a projected coordinate system, vertical units are assumed to be the same as the horizontal units specified by the service.

isSelfIntersecting Boolean

Checks to see if polygon rings cross each other and indicates if the polygon is self-intersecting, which means the ring of the polygon crosses itself.

rings Number[][][]

An array of rings. Each ring is a two-dimensional array of numbers representing the coordinates of each vertex in the ring in the spatial reference of the view. The first vertex of each ring should always be the same as the last vertex. Each vertex is an array of two, three, or four numbers. The table below shows the various structures of a vertex array.

Case	Vertex array
without z and without m	[x, y]
without z and with m	[x, y, m]
with z and without m	[x, y, z]
with z and with m	[x, y, z, m]

Example

//3D polygon rings with m-values (note that the second ring does not have m-values defined for it)
const rings = [
 [  // first ring
  [-97.06138,32.837,35.1,4.8],
  [-97.06133,32.836,35.2,4.1],
  [-97.06124,32.834,35.3,4.2],
  [-97.06138,32.837,35.1,4.8]  // same as first vertex
 ], [  // second ring
  [-97.06326,32.759,35.4],
  [-97.06298,32.755,35.5],
  [-97.06153,32.749,35.6],
  [-97.06326,32.759,35.4]  // same as first vertex
 ]
];

const polygon = new Polygon({
  hasZ: true,
  hasM: true,
  rings: rings,
  spatialReference: { wkid: 4326 }
});

spatialReference SpatialReferenceautocast inherited

The spatial reference of the geometry.

Default Value:WGS84 (wkid: 4326)

type Stringreadonly

The string value representing the type of geometry.

For Polygon the type is always "polygon".

Method Overview

Method Details

addHandles(handleOrHandles, groupKey)inherited

Since: ArcGIS Maps SDK for JavaScript 4.25

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle[] Handles marked for removal once the object is destroyed.

groupKey * optional Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

addRing(points){Polygon}

Adds a ring to the Polygon. The ring can be one of the following: an array of numbers or an array of points. When added the index of the ring is incremented by one.

Parameter

points Point[]|Number[][] A polygon ring. The first and last coordinates/points in the ring must be the same. This can either be defined as an array of Point geometries or an array of XY coordinates.

Returns

Type	Description
Polygon	Returns the polygon with the new ring included.

clone(){Polygon}

Creates a deep clone of Polygon object.

Returns

Type	Description
Polygon	A new instance of a Polygon object equal to the object used to call .clone().

contains(point){Boolean}

Checks on the client if the input point is inside the polygon. A point on the polygon line is considered inside.

Parameter

point Point The point to test whether it is contained within the testing polygon.

Returns

Type	Description
Boolean	Returns true if the point is located inside the polygon.

fromExtent(extent){Polygon}static

Converts the given Extent to a Polygon instance. This is useful for scenarios in which you would like to display an area of interest, which is typically defined by an Extent or bounding box, as a polygon with a fill symbol in the view. Some geoprocessing tools require input geometries to be of a Polygon type and not an Extent.

Parameter

extent Extent An extent object to convert to a polygon.

Returns

Type	Description
Polygon	A polygon instance representing the given extent.

Example

view.on("click", function(evt) {
  const area = Polygon.fromExtent(view.extent);
  const graphic = new Graphic({
    geometry: area,
    symbol: { type: "simple-fill" }
  });
  view.graphics.add(graphic);
});

fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter

json Object A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns

Type	Description
*	Returns a new instance of this class.

getPoint(ringIndex, pointIndex){Point}

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

Parameters

ringIndex Number The index of the ring containing the desired point.

pointIndex Number The index of the desired point within the ring.

Returns

Type	Description
Point	Returns the point at the specified ring index and point index.

hasHandles(groupKey){Boolean}inherited

Since: ArcGIS Maps SDK for JavaScript 4.25

Returns true if a named group of handles exist.

Parameter

groupKey * optional A group key.

Returns

Type	Description
Boolean	Returns true if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

insertPoint(ringIndex, pointIndex, point){Polygon}

Inserts a new point into the polygon.

Parameters

ringIndex Number The index of the ring in which to insert the point.

pointIndex Number The index of the point to insert within the ring.

point Point|Number[] The point to insert.

Returns

Type	Description
Polygon	Returns the updated polygon.

isClockwise(ring){Boolean}

Checks if a Polygon ring is clockwise.

Parameter

ring Point[]|Number[][] A polygon ring. The first and last coordinates/points in the ring must be the same. This can either be defined as an array of Point geometries or an array of XY coordinates.

Returns

Type	Description
Boolean	Returns true if the ring is clockwise and false for counterclockwise.

removeHandles(groupKey)inherited

Since: ArcGIS Maps SDK for JavaScript 4.25

Removes a group of handles owned by the object.

Parameter

groupKey * optional A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

removePoint(ringIndex, pointIndex){Point[]}

Removes a point from the polygon at the given pointIndex within the ring identified by ringIndex.

Parameters

ringIndex Number The index of the ring containing the point to remove.

pointIndex Number The index of the point to remove within the ring.

Returns

Type	Description
Point[]	Returns the geometry of the removed point.

removeRing(index){Point[]}

Removes a ring from the Polygon. The index specifies which ring to remove.

Parameter

index Number The index of the ring to remove.

Returns

Type	Description
Point[]	Returns array of points representing the removed ring.

setPoint(ringIndex, pointIndex, point){Polygon}

Updates a point in the polygon.

Parameters

ringIndex Number The index of the ring containing the point to update.

pointIndex Number The index of the point to update within the ring.

point Point|Number[] The new point geometry.

Returns

Type	Description
Polygon	Returns the updated polygon.

toJSON(){Object}inherited

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns

Type	Description
Object	The ArcGIS portal JSON representation of an instance of this class.