You may have noticed that it is easy to draw features that don't line up nicely with existing features. In addition, when modifying features, we can break topology — adding a void between polygons that were previously adjacent. The Snap interaction can be used to help preserve topology while drawing and editing features.

First, import the Snap interaction into your main.js:

import Snap from 'ol/interaction/snap';

As with the other editing interactions, we'll configure the snap interaction to work with our vector source and add it to the map:

map.addInteraction(new Snap({
  source: source

With the draw, modify, and snap interactions all active, we can edit data while maintaining topology.

Uniting nations with the snap interaction
Uniting nations with the snap interaction

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