Class: Polygon

ol/geom/Polygon~Polygon 


import Polygon from 'ol/geom/Polygon.js';

Polygon geometry.

new Polygon(coordinates, layout, ends)

geom/Polygon.js, line 27
Name Type Description
coordinates !ArrayCoordinate>> | !Array.<number>

Array of linear rings that define the polygon. The first linear ring of the array defines the outer-boundary or surface of the polygon. Each subsequent linear ring defines a hole in the surface of the polygon. A linear ring is an array of vertices' coordinates where the first coordinate and the last are equivalent. (For internal use, flat coordinates in combination with layout and ends are also accepted.)
layout GeometryLayout | undefined

Layout.
ends Array.<number> | undefined

Ends (for internal use with flat coordinates).
Fires:

Extends

Methods

appendLinearRing(linearRing)

geom/Polygon.js, line 105

Append the passed linear ring to this polygon.

Name Type Description
linearRing LinearRing

Linear ring.

applyTransform(transformFn) inherited

geom/SimpleGeometry.js, line 206

Apply a transform function to the coordinates of the geometry. The geometry is modified in place. If you do not want the geometry modified in place, first clone() it and then use this function on the clone.

Name Type Description
transformFn TransformFunction

Transform function. Called with a flat array of geometry coordinates.

changed() inherited

Observable.js, line 68

Increases the revision counter and dispatches a 'change' event.

clone(){Polygon}

geom/Polygon.js, line 120

Make a complete copy of the geometry.

Returns:
Clone.

dispatchEvent(event){boolean | undefined} inherited

events/Target.js, line 85

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name Type Description
event BaseEvent | string

Event object.
Returns:
false if anyone called preventDefault on the event object or if any of the listeners returned false.

get(key){*} inherited

Object.js, line 135

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getArea(){number}

geom/Polygon.js, line 188

Return the area of the polygon on projected plane.

Returns:
Area (on projected plane).

getClosestPoint(point, closestPoint){Coordinate} inherited

geom/Geometry.js, line 154

Return the closest point of the geometry to the passed point as coordinate.

Name Type Description
point Coordinate

Point.
closestPoint Coordinate | undefined

Closest point.
Returns:
Closest point.

getCoordinates(right){ArrayCoordinate>>}

geom/Polygon.js, line 210

Get the coordinate array for this geometry. This array has the structure of a GeoJSON coordinate array for polygons.

Name Type Description
right boolean | undefined

Orient coordinates according to the right-hand rule (counter-clockwise for exterior and clockwise for interior rings). If false, coordinates will be oriented according to the left-hand rule (clockwise for exterior and counter-clockwise for interior rings). By default, coordinate orientation will depend on how the geometry was constructed.
Returns:
Coordinates.

getExtent(extent){Extent} inherited

geom/Geometry.js, line 187

Get the extent of the geometry.

Name Type Description
extent Extent | undefined

Extent.
Returns:
extent Extent.

getFirstCoordinate(){Coordinate} inherited

geom/SimpleGeometry.js, line 68

Return the first coordinate of the geometry.

Returns:
First coordinate.

getInteriorPoint(){Point}

geom/Polygon.js, line 254

Return an interior point of the polygon.

Returns:
Interior point as XYM coordinate, where M is the length of the horizontal intersection that the point belongs to.

getKeys(){Array.<string>} inherited

Object.js, line 148

Get a list of object property names.

Returns:
List of property names.

getLastCoordinate(){Coordinate} inherited

geom/SimpleGeometry.js, line 84

Return the last coordinate of the geometry.

Returns:
Last point.

getLayout(){GeometryLayout} inherited

geom/SimpleGeometry.js, line 95

Return the layout of the geometry.

Returns:
Layout.

getLinearRing(index){LinearRing | null}

geom/Polygon.js, line 279

Return the Nth linear ring of the polygon geometry. Return null if the given index is out of range. The exterior linear ring is available at index 0 and the interior rings at index 1 and beyond.

Name Type Description
index number

Index.
Returns:
Linear ring.

getLinearRingCount(){number}

geom/Polygon.js, line 265

Return the number of rings of the polygon, this includes the exterior ring and any interior rings.

Returns:
Number of rings.

getLinearRings(){Array<LinearRing>}

geom/Polygon.js, line 297

Return the linear rings of the polygon.

Returns:
Linear rings.

getProperties(){Object.<string, *>} inherited

Object.js, line 157

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

Observable.js, line 79

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:
Revision.

getType(){Type}

geom/Polygon.js, line 363

Get the type of this geometry.

Returns:
Geometry type.

intersectsCoordinate(coordinate){boolean} inherited

geom/Geometry.js, line 167

Returns true if this geometry includes the specified coordinate. If the coordinate is on the boundary of the geometry, returns false.

Name Type Description
coordinate Coordinate

Coordinate.
Returns:
Contains coordinate.

intersectsExtent(extent){boolean}

geom/Polygon.js, line 373

Test if the geometry and the passed extent intersect.

Name Type Description
extent Extent

Extent.
Returns:
true if the geometry and the extent intersect.

on(type, listener){EventsKey | Array<EventsKey>} inherited

Observable.js, line 152

Listen for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

once(type, listener){EventsKey | Array<EventsKey>} inherited

Observable.js, line 164

Listen once for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

rotate(angle, anchor) inherited

geom/SimpleGeometry.js, line 220

Rotate the geometry around a given coordinate. This modifies the geometry coordinates in place.

Name Type Description
angle number

Rotation angle in counter-clockwise radians.
anchor Coordinate

The rotation center.

scale(sx, sy, anchor) inherited

geom/SimpleGeometry.js, line 246

Scale the geometry (with an optional origin). This modifies the geometry coordinates in place.

Name Type Description
sx number

The scaling factor in the x-direction.
sy number | undefined

The scaling factor in the y-direction (defaults to sx).
anchor Coordinate | undefined

The scale origin (defaults to the center of the geometry extent).

set(key, value, silent) inherited

Object.js, line 207

Sets a value.

Name Type Description
key string

Key name.
value *

Value.
silent boolean | undefined

Update without triggering an event.

setCoordinates(coordinates, layout)

geom/Polygon.js, line 389

Set the coordinates of the polygon.

Name Type Description
coordinates ArrayCoordinate>>

Coordinates.
layout GeometryLayout | undefined

Layout.

setProperties(values, silent) inherited

Object.js, line 227

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name Type Description
values Object.<string, *>

Values.
silent boolean | undefined

Update without triggering an event.

simplify(tolerance){Geometry} inherited

geom/Geometry.js, line 233

Create a simplified version of this geometry. For linestrings, this uses the Douglas Peucker algorithm. For polygons, a quantization-based simplification is used to preserve topology.

Name Type Description
tolerance number

The tolerance distance for simplification.
Returns:
A new, simplified version of the original geometry.

transform(source, destination){Geometry} inherited

geom/Geometry.js, line 308

Transform each coordinate of the geometry from one coordinate reference system to another. The geometry is modified in place. For example, a line will be transformed to a line and a circle to a circle. If you do not want the geometry modified in place, first clone() it and then use this function on the clone.

Name Type Description
source ProjectionLike

The current projection. Can be a string identifier or a Projection object.
destination ProjectionLike

The desired projection. Can be a string identifier or a Projection object.
Returns:
This geometry. Note that original geometry is modified in place.

translate(deltaX, deltaY) inherited

geom/SimpleGeometry.js, line 277

Translate the geometry. This modifies the geometry coordinates in place. If instead you want a new geometry, first clone() this geometry.

Name Type Description
deltaX number

Delta X.
deltaY number

Delta Y.

un(type, listener) inherited

Observable.js, line 173

Unlisten for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.

unset(key, silent) inherited

Object.js, line 251

Unsets a property.

Name Type Description
key string

Key name.
silent boolean | undefined

Unset without triggering an event.