react-map-gl/docs/api-reference/scale-control.md

Scale Control

This is a React equivalent of Mapbox's ScaleControl.

import {Component} from 'react';
import ReactMapGL, {ScaleControl} from 'react-map-gl';

class Map extends Component {
  render() {
    const {viewport, updateViewport} = this.props;
    return (
      <ReactMapGL {...viewport} onViewportChange={updateViewport}>
        <div style={{position: 'absolute', bottom: 100, left: 20}}>
          <ScaleControl maxWidth={100} unit="metric"}/>
        </div>
      </ReactMapGL>
    );
  }
}

Properties

maxWidth (Number)

• default: 100

The maximum length of the scale control in pixels.

unit (String)

• default: 'metric'

Unit of the distance, one of 'imperial', 'metric' or 'nautical'.

Styling

Like its Mapbox counterpart, this control relies on the mapbox-gl stylesheet to work properly. Make sure to add the stylesheet to your page.

Source

scale-control.js