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

ScaleControl

This is a React equivalent of Mapbox's ScaleControl.

import * as React from 'react';
import ReactMapGL, {ScaleControl} from 'react-map-gl';

const scaleControlStyle= {
  left: 20,
  bottom: 100
};

function App() {
  const [viewport, setViewport] = React.useState({
    longitude: -122.45,
    latitude: 37.78,
    zoom: 14
  });
  return (
    <ReactMapGL {...viewport} width="100vw" height="100vh" onViewportChange={setViewport}>
      <ScaleControl maxWidth={100} unit="metric" style={scaleControlStyle} />
    </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'.

className (String)

Assign a custom class name to the container of this control.

style (Object)

• default: {position: 'absolute'}

A React style object applied to this control.

captureScroll (Boolean)

• default: false

Stop propagation of mouse wheel event to the map component. Can be used to stop map from zooming when this component is scrolled.

captureDrag (Boolean)

• default: true

Stop propagation of dragstart event to the map component. Can be used to stop map from panning when this component is dragged.

captureClick (Boolean)

• default: true

Stop propagation of click event to the map component. Can be used to stop map from calling the onClick callback when this component is clicked.

captureDoubleClick (Boolean)

• default: true

Stop propagation of dblclick event to the map component. Can be used to stop map from zooming when this component is double clicked.

capturePointerMove (Boolean)

• default: false

Stop propagation of pointermove event to the map component. Can be used to stop map from calling the onMouseMove or onTouchMove callback when this component is hovered.

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