WKT class

The WKT text format for coordinate and geometry objects.

Rules applied by the format conforms with WKT (Well-known text representation of geometry) formatting of coordinate lists and geometries.

Examples:

• point (empty): POINT EMPTY
• point (x, y): POINT(10.1 20.2)
• point (x, y, z): POINT Z(10.1 20.2 30.3)
• point (x, y, m): POINT M(10.1 20.2 30.3)
• point (x, y, z, m): POINT ZM(10.1 20.2 30.3 40.4)
• geopoint (lon, lat): POINT(10.1 20.2)
• box (min-x, min-y, max-x, max-y) with values 10.1 10.1,20.2 20.2:
  • POLYGON((10.1 10.1,20.2 10.1,20.2 20.2,10.1 20.2,10.1 10.1))
• multi point (with 2D points):
  • MULTIPOINT(10.1 10.1,20.2 20.2,30.3 30.3)
• line string (with 2D points):
  • LINESTRING(10.1 10.1,20.2 20.2,30.3 30.3)
• multi line string (with 2D points):
  • MULTILINESTRING((35 10,45 45,15 40,10 20,35 10))
• polygon (with 2D points):
  • POLYGON((35 10,45 45,15 40,10 20,35 10))
• multi polygon (with 2D points):
  • MULTIPOLYGON(((35 10,45 45,15 40,10 20,35 10)))
• coordinates for other geometries with similar principles

Note that WKT does not specify bounding box formatting. Here bounding boxes are formatted as polygons. See also wktLikeFormat that formats them as a point series of two points (min, max).

Available extensions

• WKTExtension

Constructors

WKT()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

parser<T extends Point<num>>(PointFactory<T> point, [PointFactory<T>? pointWithM]) → WktFactory<T>

Available on WKT, provided by the WKTExtension extension

Creates a WKT factory instace using the point factory.

parserGeographic() → WktFactory<GeoPoint>

Available on WKT, provided by the WKTExtension extension

The default WKT factory instace assuming geographic CRS80 coordinates.

parserProjected() → WktFactory<Point<num>>

Available on WKT, provided by the WKTExtension extension

The default WKT factory instace assuming cartesian/projected coordinates.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

coordinate → const TextWriterFormat<CoordinateContent>

The WKT text writer format for coordinate objects.

geometry → const TextWriterFormat<GeometryContent>

The WKT text writer format for geometry objects.