The antimeridian

A front drawn across the Pacific should be painted the short way, not across the whole world.

Drawn points are kept continuous: each longitude within 180° of the one before, running past ±180 when a graphic crosses it. A line drawn from 179°E to 179°W is saved as [179, …] to [181, …].

• metocFeature and the collection save points that way, and drawnPoints unwraps a file folded into ±180°, so every painter reads continuous points.
• The editor measures drags and nudges near the graphic, and the renderers put a point on the world copy nearest the view's centre.
• A consumer that needs longitudes in ±180° can fold them with wrapLongitude.

import {wrapLongitude} from '@zaes/metoc';

wrapLongitude(181);   // -179