Sector

Sector is the sector geometry class of maptalks, inheriting from Circle. It is defined by a center point, a radius, a start angle, and an end angle, used to represent sector-shaped areal features such as radar scanning areas or parking radii.

import { Sector } from "maptalks";
// Usage example
const sector = new Sector([0, 0], 1000, 0, Math.PI / 2);

Constructor

new Sector(center, radius, startAngle, endAngle, options?)

Parameters:

• center — The center point coordinates of the sector, e.g. [x, y].
• radius — The radius of the sector.
• startAngle — The start angle of the sector.
• endAngle — The end angle of the sector.
• options — (Optional) Configuration options, see the table below.

options

Config	Type	Description	Default
numberOfShellPoints	number	The number of shell sample points when generating the sector	60

Methods

• getStartAngle() — Gets the start angle of the sector.
• setStartAngle(angle) — Sets the start angle of the sector.
• getEndAngle() — Gets the end angle of the sector.
• setEndAngle(angle) — Sets the end angle of the sector.
• getShell() — Gets the outer ring of the sector.
• getRotateOffsetAngle() — Returns the rotate offset angle of the sector (always 90).

Static Methods

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

Events

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