LineString

LineString is the line geometry class of maptalks, inheriting from Path. It consists of a sequence of coordinate points forming a polyline, and supports configuring arrow styles and arrow placement. It is commonly used for linear features such as roads and tracks.

import { LineString } from "maptalks";
// Usage example
const draw = new LineString([[0, 0], [1, 1], [2, 0]]);

Constructor

new LineString(coordinates, options?)

Parameters:

• coordinates — The coordinate array of the line, supporting forms such as [[x, y], ...], [[x, y, z], ...], or [{x, y}, ...].
• options — (Optional) Configuration options, see the table below.

options

Config	Type	Description	Default
arrowStyle	string | Array	The arrow style, 'classic' or [width, height]	null
arrowPlacement	string	The arrow placement: 'vertex-last', 'vertex-first', 'vertex-firstlast', or 'point'	'vertex-last'

Methods

• setCoordinates(coords) — Sets the coordinate points of the line.
• getCoordinates() — Gets the coordinate points of the line.
• getCenterInExtent(extent) — Returns the center point within the given extent.
• getOutline() — Returns the outline of the line.

Static Methods

• fromJSON(json) — Creates a LineString from a JSON object.

Events

• shapechange — Fired when the shape of the line changes.