mapbox-gl-compare

mapbox-gl-compare

Swipe and sync between two maps

Map movements are synced with mapbox-gl-sync-move.

Usage

var before = new mapboxgl.Map({
  container: 'before', // Container ID
  style: 'mapbox://styles/mapbox/light-v9'
});
 
var after = new mapboxgl.Map({
  container: 'after', // Container ID
  style: 'mapbox://styles/mapbox/dark-v9'
});
 
// A selector or reference to HTML element
var container = '#comparison-container';
 
new mapboxgl.Compare(before, after, container, {
  mousemove: true, // Optional. Set to true to enable swiping during cursor movement.
  orientation: 'vertical' // Optional. Sets the orientation of swiper to horizontal or vertical, defaults to vertical
});

Methods

compare = new mapboxgl.Compare(before, after, container, {
  mousemove: true, // Optional. Set to true to enable swiping during cursor movement.
  orientation: 'vertical' // Optional. Sets the orientation of swiper to horizontal or vertical, defaults to vertical
});
 
//Get Current position - this will return the slider's current position, in pixels
compare.currentPosition;
 
//Set Position - this will set the slider at the specified (x) number of pixels from the left-edge or top-edge of viewport based on swiper orientation
compare.setSlider(x);
 
//Listen to slider movement - and return current position on each slideend
compare.on('slideend', (e) => {
  console.log(e.currentPosition);
});
 
//Remove - this will remove the compare control from the DOM and stop synchronizing the two maps.
compare.remove();

Demo: https://www.mapbox.com/mapbox-gl-js/example/mapbox-gl-compare/

See API.md for complete reference.

Developing

npm install & npm start & open http://localhost:9966

You'll need a Mapbox access token stored in localstorage. Set it via

localStorage.setItem('MapboxAccessToken', '<TOKEN HERE>');

Testing

Tests require an MapboxAccessToken env variable to be set.

export MapboxAccessToken="YOUR ACCESS TOKEN"

Lastly, run the test command from the console:

npm test

Deploying

• npm run build
• Update the version key in package.json
• Update CHANGELOG.md
• Commit and push
• git tag -a vX.X.X -m 'vX.X.X'
• git push --tags
• npm publish
• Update version number in GL JS example