A-B Wayfinding

Wayfinding is one of the most often used features of digital maps. This guide shows how to display a route from A to B using Mappedin React Native SDK. It continues from a basic map display example.

When you have a map display component setup, we'll add interactivity to the polygons with onPolygonClicked -callback property of MiMapView.

First, we'll need to setup destination and departure variables inside our component:

const [destination, setDestination] = React.useState<MappedinLocation>();
const [departure, setDeparture] = React.useState<MappedinLocation>();

Then adding the onPolygonClicked -callback will set those variables so that departure polygon is the one tapped first:

<MiMapView
style={{flex: 1}}
ref={mapView}
options={options}
onPolygonClicked={({polygon}) => {
if (departure === undefined) {
setDeparture(polygon.locations[0]);
mapView.current?.setPolygonColor(polygon, 'green');
} else {
setDestination(polygon.locations[0]);
}
}}
/>

Only the departure polygon is colored once we start tapping on the map now. To draw the path, we'll create a useEffect hook that will render when destination is set.

MappedinLocation object has a directionsTo()-method, which takes the destination as a parameter. That's how we get back the directions, which we then feed to Journey.draw() to render them on the map.

useEffect(() => {
async function drawDirections() {
const directions = await departure.directionsTo(destination);
mapView.current?.Journey.draw(directions);
}
if (!departure || !destination) return;
drawDirections();
}, [departure, destination]);

Finished sample

import React, {useEffect} from 'react';
import {
MappedinLocation,
MapViewStore,
MiMapView,
} from '@mappedin/react-native-sdk';
// See Trial API key Terms and Conditions
// https://developer.mappedin.com/guides/api-keys
const options = {
clientId: '5eab30aa91b055001a68e996',
clientSecret: 'RJyRXKcryCMy4erZqqCbuB1NbR66QTGNXVE0x3Pg6oCIlUR1',
venue: 'mappedin-demo-mall',
labelAllLocationsOnInit: false,
};
const App = () => {
const mapView = React.useRef<MapViewStore>(null);
const [destination, setDestination] = React.useState<MappedinLocation>();
const [departure, setDeparture] = React.useState<MappedinLocation>();
useEffect(() => {
async function drawDirections() {
const directions = await departure.directionsTo(destination);
console.log(directions);
mapView.current?.Journey.draw(directions);
}
if (!departure || !destination) return;
drawDirections();
}, [departure, destination]);
return (
<>
<MiMapView
style={{flex: 1}}
ref={mapView}
options={options}
onPolygonClicked={({polygon}) => {
if (departure === undefined) {
setDeparture(polygon.locations[0]);
mapView.current?.setPolygonColor(polygon, 'green');
} else {
setDestination(polygon.locations[0]);
}
}}
/>
</>
);
};
export default App;

See A-B wayfinding with Web SDK guide for more advanced use cases such as multi-floor and multi-destination wayfinding

Was this page helpful?

Next Topic

Blue Dot