Classes
Functions

import {createBox} from 'ol/interaction/Draw';
Create a
geometryFunction
that will create a boxshaped polygon (aligned with the coordinate system axes). Use this with the draw interaction andtype: 'Circle'
to return a box instead of a circle geometry.Returns:
Function that draws a boxshaped polygon.

import {createRegularPolygon} from 'ol/interaction/Draw';
Create a
geometryFunction
fortype: 'Circle'
that will create a regular polygon with a user specified number of sides and start angle instead of aCircle
geometry.Name Type Description sides
number  undefined Number of sides of the regular polygon. Default is 32.
angle
number  undefined Angle of the first point in counterclockwise radians. 0 means East. Default is the angle defined by the heading from the center of the regular polygon to the current pointer position.
Returns:
Function that draws a polygon.
Type Definitions

Function that takes an array of coordinates and an optional existing geometry and a projection as arguments, and returns a geometry. The optional existing geometry is the geometry that is returned when the function is called without a second argument.

LineCoordType{Array<Coordinate>}

Coordinate type when drawing lines.

Mode{'Point'} {'LineString'} {'Polygon'} {'Circle'}

Draw mode. This collapses multipart geometry types with their singlepart cousins.

Options{Object}

Properties:
Name Type Description type
Type Geometry type of the geometries being drawn with this instance.
clickTolerance
number
(defaults to 6)The maximum distance in pixels between "down" and "up" for a "up" event to be considered a "click" event and actually add a point/vertex to the geometry being drawn. The default of
6
was chosen for the draw interaction to behave correctly on mouse as well as on touch devices.features
Collection<Feature>  undefined Destination collection for the drawn features.
source
VectorSource  undefined Destination source for the drawn features.
dragVertexDelay
number
(defaults to 500)Delay in milliseconds after pointerdown before the current vertex can be dragged to its exact position.
snapTolerance
number
(defaults to 12)Pixel distance for snapping to the drawing finish. Must be greater than
0
.stopClick
boolean
(defaults to false)Stop click, singleclick, and doubleclick events from firing during drawing.
maxPoints
number  undefined The number of points that can be drawn before a polygon ring or line string is finished. By default there is no restriction.
minPoints
number  undefined The number of points that must be drawn before a polygon ring or line string can be finished. Default is
3
for polygon rings and2
for line strings.finishCondition
Condition  undefined A function that takes an
MapBrowserEvent
and returns a boolean to indicate whether the drawing can be finished. Not used when drawing POINT or MULTI_POINT geometries.style
StyleLike  FlatStyleLike  undefined Style for sketch features. The draw interaction can have up to three sketch features, depending on the mode. It will always contain a feature with a
Point
geometry that corresponds to the current cursor position. If the mode isLineString
orPolygon
, and there is at least one drawn point, it will also contain a feature with aLineString
geometry that corresponds to the line between the already drawn points and the current cursor position. If the mode isPolygon
, and there is at least one drawn point, it will also contain a feature with aPolygon
geometry that corresponds to the polygon between the already drawn points and the current cursor position (note that this polygon has only two points if only one point is drawn). If the mode isCircle
, and there is one point drawn, it will also contain a feature with aCircle
geometry whose center is the drawn point and the radius is determined by the distance between the drawn point and the cursor.geometryFunction
GeometryFunction  undefined Function that is called when a geometry's coordinates are updated.
geometryName
string  undefined Geometry name to use for features created by the draw interaction.
condition
Condition  undefined A function that takes an
MapBrowserEvent
and returns a boolean to indicate whether that event should be handled. By defaultnoModifierKeys
, i.e. a click, adds a vertex or deactivates freehand drawing.freehand
boolean
(defaults to false)Operate in freehand mode for lines, polygons, and circles. This makes the interaction always operate in freehand mode and takes precedence over any
freehandCondition
option.freehandCondition
Condition  undefined Condition that activates freehand drawing for lines and polygons. This function takes an
MapBrowserEvent
and returns a boolean to indicate whether that event should be handled. The default isshiftKeyOnly
, meaning that the Shift key activates freehand drawing.trace
boolean  Condition
(defaults to false)Trace a portion of another geometry. Ignored when in freehand mode.
traceSource
VectorSource  undefined Source for features to trace. If tracing is active and a
traceSource
is not provided, the interaction'ssource
will be used. Tracing requires that the interaction is configured with either atraceSource
or asource
.wrapX
boolean
(defaults to false)Wrap the world horizontally on the sketch overlay.
geometryLayout
GeometryLayout
(defaults to 'XY')Layout of the feature geometries created by the draw interaction.

PointCoordType{Coordinate}

Coordinate type when drawing points.

PointSegmentRelationship{Object}

Properties:
Name Type Description along
number The closest point expressed as a fraction along the segment length.
squaredDistance
number The squared distance of the point to the segment.

PolyCoordType{Array<Array<Coordinate>>}

Coordinate type when drawing polygons.

SketchCoordType{PointCoordType} {LineCoordType} {PolyCoordType}

Types used for drawing coordinates.

TraceState{Object}

Properties:
Name Type Description active
boolean Tracing active.
startPx
Pixel  undefined The initially clicked pixel location.
targets
Array<TraceTarget>  undefined Targets available for tracing.
targetIndex
number  undefined The index of the currently traced target. A value of 1 indicates that no trace target is active.

TraceTarget{Object}

Properties:
Name Type Description coordinates
Array<Coordinate> Target coordinates.
ring
boolean The target coordinates are a linear ring.
startIndex
number The index of first traced coordinate. A fractional index represents an edge intersection. Index values for rings will wrap (may be negative or larger than coordinates length).
endIndex
number The index of last traced coordinate. Details from startIndex also apply here.

TraceTargetUpdateInfo{Object}

Properties:
Name Type Description index
number The new target index.
endIndex
number The new segment end index.