Boat animated track - 2019_08_31

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}

README.md

See this blog post for context and details.

• Original idea by the New York Times (dataviz ; source code)
• Adapted to Leaflet by @pvernier
• Refactored and adapted to GeoJSON data extracted from a GPX file by @brunob

earth.svg

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Le Zigomar !</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css"
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<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"
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	crossorigin=""></script>
<script src="https://calvinmetcalf.github.io/leaflet-ajax/dist/leaflet.ajax.js"></script>
<style>
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	.info p { margin-top: 0; }
	.info #speed { background: #d7301f; height: 4px; width: 0; transition: all 0.5s ease; }
	.glyphicon { display: inline-block; width: 16px; height: 16px; background-size: 16px; }
	.glyphicon-globe { background-image: url(earth.svg); }
	.glyphicon-target { background-image: url(target.svg); }
	.glyphicon-play { background-image: url(play.svg); }
	.glyphicon-pause { background-image: url(pause.svg); }
	.glyphicon-replay { background-image: url(replay.svg); }
	.glyphicon-time { background-image: url(time.svg); }
</style>
</head>
<body>

<div id="map"></div>

<script>

var bounds;
var map = L.map('map', {
	center: [48.31356955685135, -4.523620605468751],
	zoom: 10,
	playing: false,
	tracking: false
});

L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_labels_under/{z}/{x}/{y}{r}.png', {
	attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors &copy; <a href="https://carto.com/attributions">CARTO</a>',
	subdomains: 'abcd',
	maxZoom: 19
}).addTo(map);

L.Util.ajax('2019_08_31.json').then(function(data){

	var bounds = L.geoJSON(data).getBounds();
	map.fitBounds(bounds);
	
	var trackControl = L.control({position: 'topright'});
	trackControl.onAdd = function(map) {
		var container = L.DomUtil.create('div', 'leaflet-bar');
		
		var animButton = L.DomUtil.create('a', 'glyphicon glyphicon-play', container);
		animButton.setAttribute('role', 'button');
		animButton.title = 'Start, pause or replay the animation';
		animButton.setAttribute('aria-label', animButton.title);
		animButton.setAttribute('id', 'animButton');
		// usefull ?
		L.DomEvent.on(animButton, 'click', L.DomEvent.stopPropagation);
		L.DomEvent.on(animButton, 'click', L.DomEvent.preventDefault);
		//
		L.DomEvent.on(animButton, 'click', function() {
			// Play
			if (L.DomUtil.hasClass(animButton, 'glyphicon-play') === true) {
				L.DomUtil.setClass(animButton, 'glyphicon glyphicon-pause');
				map.playing = true;
				window.requestAnimationFrame(addSegment);
			}
			// Pause
			else if (L.DomUtil.hasClass(animButton, 'glyphicon-pause') === true) {
				L.DomUtil.setClass(animButton, 'glyphicon glyphicon-play');
				map.playing = false;
			}
			// Replay
			else {
				L.DomUtil.setClass(animButton, 'glyphicon glyphicon-pause');
				map.playing = true;
				i = 2;
				window.requestAnimationFrame(addSegment);
			}
		}, this);
		
		var trackButton = L.DomUtil.create('a', 'glyphicon glyphicon-target', container);
		trackButton.setAttribute('role', 'button');
		trackButton.title = 'Click to track the boats. Click again to zoom out to full view';
		trackButton.setAttribute('aria-label', animButton.title);
		// usefull ?
		L.DomEvent.on(trackButton, 'click', L.DomEvent.stopPropagation);
		L.DomEvent.on(trackButton, 'click', L.DomEvent.preventDefault);
		//
		L.DomEvent.on(trackButton, 'click', function() {
			if (L.DomUtil.hasClass(trackButton, 'glyphicon-target') === true) {
				L.DomUtil.setClass(trackButton, 'glyphicon glyphicon-globe');
				map.setView(position._latlng, 15);
				map.tracking = true;
			} else {
				L.DomUtil.setClass(trackButton, 'glyphicon glyphicon-target');
				map.fitBounds(bounds);
				map.tracking = false;
			};
		}, this);
		
		return container;
	}
	trackControl.addTo(map); 

	var maxSpeed = Math.max.apply(Math, data.features.map(function(o) { return o.properties.speed; }));
	var info = L.control({position: 'bottomright'});
	info.onAdd = function (map) {
		var div = L.DomUtil.create('div', 'info');
		// https://stackoverflow.com/a/4020842 / find max value in array with js
		var time = new Date(data.features[0].properties.time.replace(/\//g, '-').slice(0, -3)).toTimeString().split(' ')[0];
		div.innerHTML = '<p id="chrono"><span class="glyphicon glyphicon-time" aria-hidden="true"></span> Time <span id="time">' + time +'</span></p><p>Speed (max ' + Math.round(maxSpeed * 1.94384 * 100) / 100 + ' knots)</p><p id="speed"></p>';
		return div;
	};
	info.addTo(map);

	var stylePoint = {
		radius: 30,
		fillColor: "#d7301f",
		fillOpacity: 1,
		color: "#d7301f"
	};

	var point_1 = new L.LatLng(data.features[0].geometry.coordinates[1], data.features[0].geometry.coordinates[0]);
	var point_2 = new L.LatLng(data.features[1].geometry.coordinates[1], data.features[1].geometry.coordinates[0]);
	var pointList = [point_1, point_2];

	var trailLine = L.polyline(pointList, {color: '#d7301f', weight: 1.5}).addTo(map);
	var trackLine = L.polyline(pointList, {color: '#d7301f', weight: 1, opacity: 0.2}).addTo(map);

	var position = L.circle([data.features[0].geometry.coordinates[1], data.features[0].geometry.coordinates[0]], stylePoint).addTo(map);

	var i = 2;

	function draw(layer, polyline, position, splice) {
		position._latlng.lat = layer.features[i].geometry.coordinates[1];
		position._latlng.lng = layer.features[i].geometry.coordinates[0];
		position.redraw();

		var point_n = new L.LatLng(layer.features[i].geometry.coordinates[1], layer.features[i].geometry.coordinates[0]);
		if (polyline._latlngs.length < 11) {
			polyline.addLatLng(point_n);
		}
		else {
			if (splice) {
				polyline.getLatLngs().splice(0, 1);
			}
			polyline.addLatLng(point_n);
		}
		if (map.tracking === true) {
			map.setView(position._latlng, 15);
		}
	}

	function addSegment() {
		var time = L.DomUtil.get('time');
		var speed = L.DomUtil.get('speed');
		if (i++ < data.features.length - 1)  {
			draw(data, trailLine, position, true);
			draw(data, trackLine, position, false);
			if (i%6==0) {
				time.innerHTML = new Date(data.features[i].properties.time.replace(/\//g, '-').slice(0, -3)).toTimeString().split(' ')[0];
				speed.setAttribute('style', 'width: ' + data.features[i].properties.speed * 100 / maxSpeed + '%');
			}
		} else {
			map.playing = false;
			L.DomUtil.setClass(L.DomUtil.get('animButton'), 'glyphicon glyphicon-replay');
			trailLine.getLatLngs().splice(0, 11);
			L.DomUtil.get('speed').setAttribute('style', 'width: 0');
		}
		if(map.playing){ 
			window.requestAnimationFrame(addSegment);
		}
	}

});
	
</script>

</body>
</html>

pause.svg

play.svg

preview.png

replay.svg

target.svg

thumbnail.png

time.svg