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Add a GeoJSON Line ​

Add a GeoJSON LineString source and display it as a styled line layer on the map.

Add a GeoJSON Line ​

javascript
map.on('load', () => {
  map.addSource('route', {
    type: 'geojson',
    data: {
      type: 'Feature',
      geometry: {
        type: 'LineString',
        coordinates: [
          [lng1, lat1],
          [lng2, lat2],
          [lng3, lat3]
        ]
      }
    }
  });

  map.addLayer({
    id: 'route-line',
    type: 'line',
    source: 'route',
    layout: { 'line-join': 'round', 'line-cap': 'round' },
    paint: {
      'line-color': '#3b82f6',
      'line-width': 4,
      'line-opacity': 0.9
    }
  });
});

Line Style Options ​

javascript
paint: {
  'line-color': '#3b82f6',
  'line-width': 4,
  'line-opacity': 0.9,
  'line-dasharray': [2, 4],   // dashed line
  'line-blur': 1,             // soft edge
  'line-gap-width': 2         // gap between double lines
}

Complete Example ​

html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <link href="https://cdn.mapmetrics-atlas.net/versions/latest/mapmetrics-gl.css" rel="stylesheet" />
    <script src="https://cdn.mapmetrics-atlas.net/versions/latest/mapmetrics-gl.js"></script>
    <style>#map { height: 500px; width: 100%; }</style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const map = new mapmetricsgl.Map({
        container: 'map',
        style: '<StyleFile_URL_with_Token>',
        center: [2.349902, 48.852966],
        zoom: 4
      });
      map.addControl(new mapmetricsgl.NavigationControl(), 'top-right');
      map.on('load', () => {
        map.addSource('route', {
          type: 'geojson',
          data: {
            type: 'Feature',
            geometry: {
              type: 'LineString',
              coordinates: [[2.349902, 48.852966], [-0.1276, 51.5074], [13.405, 52.52]]
            }
          }
        });
        map.addLayer({
          id: 'route-line',
          type: 'line',
          source: 'route',
          layout: { 'line-join': 'round', 'line-cap': 'round' },
          paint: { 'line-color': '#3b82f6', 'line-width': 4 }
        });
      });
    </script>
  </body>
</html>
jsx
import React, { useEffect, useRef } from 'react';
import mapmetricsgl from '@mapmetrics/mapmetrics-gl';
import '@mapmetrics/mapmetrics-gl/dist/mapmetrics-gl.css';

const GeoJSONLine = () => {
  const mapContainer = useRef(null);
  const map = useRef(null);

  useEffect(() => {
    if (map.current) return;
    map.current = new mapmetricsgl.Map({
      container: mapContainer.current,
      style: '<StyleFile_URL_with_Token>',
      center: [2.349902, 48.852966],
      zoom: 4
    });
    map.current.addControl(new mapmetricsgl.NavigationControl(), 'top-right');
    map.current.on('load', () => {
      map.current.addSource('route', {
        type: 'geojson',
        data: {
          type: 'Feature',
          geometry: {
            type: 'LineString',
            coordinates: [[2.349902, 48.852966], [-0.1276, 51.5074], [13.405, 52.52]]
          }
        }
      });
      map.current.addLayer({
        id: 'route-line',
        type: 'line',
        source: 'route',
        layout: { 'line-join': 'round', 'line-cap': 'round' },
        paint: { 'line-color': '#3b82f6', 'line-width': 4 }
      });
    });
    return () => { map.current?.remove(); map.current = null; };
  }, []);

  return <div ref={mapContainer} style={{ height: '500px', width: '100%' }} />;
};

export default GeoJSONLine;

For more information, visit the MapMetrics GitHub repository.