react-map-gl/docs/api-reference/scale-control.md
2023-06-01 17:14:09 -07:00

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# ScaleControl
React component that wraps the base library's `ScaleControl` class ([Mapbox](https://docs.mapbox.com/mapbox-gl-js/api/markers/#scalecontrol) | [Maplibre](https://maplibre.org/maplibre-gl-js-docs/api/markers/#scalecontrol)).
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
<Tabs groupId="map-library">
<TabItem value="mapbox" label="Mapbox">
```tsx
import * as React from 'react';
import Map, {ScaleControl} from 'react-map-gl';
function App() {
return <Map
mapboxAccessToken="<Mapbox access token>"
initialViewState={{
longitude: -100,
latitude: 40,
zoom: 3.5
}}
mapStyle="mapbox://styles/mapbox/streets-v9"
>
<ScaleControl />
</Map>;
}
```
</TabItem>
<TabItem value="maplibre" label="Maplibre">
```tsx
import * as React from 'react';
import Map, {ScaleControl} from 'react-map-gl/maplibre';
function App() {
return <Map
initialViewState={{
longitude: -100,
latitude: 40,
zoom: 3.5
}}
mapStyle="https://api.maptiler.com/maps/streets/style.json?key=get_your_own_key"
>
<ScaleControl />
</Map>;
}
```
</TabItem>
</Tabs>
## Properties
### Reactive Properties
#### `maxWidth`: string {#maxwidth}
Default: `100`
The maximum length of the scale control in pixels.
#### `style`: CSSProperties {#style}
CSS style override that applies to the control's container.
#### `unit`: 'imperial' | 'metric' | 'nautical' {#unit}
Default: `'metric'`
Unit of the distance.
### Other Properties
The properties in this section are not reactive. They are only used when the component first mounts.
#### `position`: 'top-right' | 'top-left' | 'bottom-right' | 'bottom-left' {#position}
Default: `'top-right'`
Placement of the control relative to the map.
## Source
[scale-control.ts](https://github.com/visgl/react-map-gl/tree/7.0-release/src/components/scale-control.ts)