Rectangles along a line

HTML

<script src="	https://npmcdn.com/@turf/turf/turf.min.js"></script>
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v0.38.0/mapbox-gl.js"></script>
<link rel="stylesheet" href="https://api.tiles.mapbox.com/mapbox-gl-js/v0.38.0/mapbox-gl.css">
<div id="map"></div>

CSS

#map {
  height: 500px;
}

JavaScript

mapboxgl.accessToken = 'pk.eyJ1IjoiZmFyYWRheTIiLCJhIjoiTUVHbDl5OCJ9.buFaqIdaIM3iXr1BOYKpsQ';

var map = new mapboxgl.Map({
  container: 'map',
  style: 'mapbox://styles/mapbox/streets-v9',
  center: [-74.10931699675322, 4.61336863727521],
  zoom: 11,
});

map.on('load', () => {
  map.addSource('line', {
    'type': 'geojson',
    'data': {
      'type': 'FeatureCollection',
      'features': [],
    },
  });

  map.addSource('rect', {
    'type': 'geojson',
    'data': {
      'type': 'FeatureCollection',
      'features': [],
    },
  });

  map.addLayer({
    id: 'line_layer',
    source: 'line',
    type: 'line',
    paint: {
      'line-width': 3,
      'line-color': '#333',
    },
  });

  map.addLayer({
    id: 'rect_layer',
    source: 'rect',
    type: 'fill',
    paint: {
      'fill-color': '#00b7bf',
    },
  });

  turfCT_COUNT = 7;
  const RECT_SIZE = 0.6;
  const BUFFER_STEPS = 32;
  const SEGMENTS = lineDistance / RECT_COUNT;
  const UNITS = 'kilometers';
  for(let i = 0; i <= RECT_COUNT; i++) {
    const point = turf.along(line, (SEGMENTS * i), UNITS);
    const buffered = turf.buffer(point, RECT_SIZE, UNITS, BUFFER_STEPS);
    const bbox = turf.bbox(buffered);
    const bboxPolygon = turf.bboxPolygon(bbox);
    rectCollection.features.push(bboxPolygon);
  }

  map.getSource('line').setData(lineCollection);
  map.getSource('rect').setData(rectCollection);
});