Boat tracker

As you can see, all stuff is handled by a well documented Leaflet API. Create your own backend, serving GeoJSON tracks with boats/planes/cars and use the code below if you would like.

Source code

HTML


<html>
    <head>
        <meta
            name="viewport"
            content="width=device-width, initial-scale=1.0, shrink-to-fit=no"
        />
        <script src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"></script>
        <script src="https://api4.windy.com/assets/libBoot.js"></script>
        <style>
            #windy {
                width: 100%;
                height: 300px;
            }
        </style>
    </head>
    <body>
        <div id="windy"></div>
        <script src="script.js"></script>
    </body>
</html>

JavaScript


const options = {
    key: 'PsLAtXpsPTZexBwUkO7Mx5I', // REPLACE WITH YOUR KEY !!!
    lat: 14,
    lon: -29,
    zoom: 4,
};

windyInit(options, windyAPI => {
    const { map } = windyAPI;

    const MARKER = encodeURI(`<?xml version="1.0" encoding="UTF-8" standalone="no"?>
        <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
        <svg width="100%" height="100%" viewBox="0 0 14 14" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:1.41421;">
        <path d="M4.784,13.635c0,0 -0.106,-2.924 0.006,-4.379c0.115,-1.502 0.318,-3.151 0.686,-4.632c0.163,-0.654 0.45,-1.623 0.755,-2.44c0.202,-0.54 0.407,-1.021 0.554,-1.352c0.038,-0.085 0.122,-0.139 0.215,-0.139c0.092,0 0.176,0.054 0.214,0.139c0.151,0.342 0.361,0.835 0.555,1.352c0.305,0.817 0.592,1.786 0.755,2.44c0.368,1.481 0.571,3.13 0.686,4.632c0.112,1.455 0.006,4.379 0.006,4.379l-4.432,0Z" style="fill:rgb(0,46,252);"/><path d="M5.481,12.731c0,0 -0.073,-3.048 0.003,-4.22c0.06,-0.909 0.886,-3.522 1.293,-4.764c0.03,-0.098 0.121,-0.165 0.223,-0.165c0.103,0 0.193,0.067 0.224,0.164c0.406,1.243 1.232,3.856 1.292,4.765c0.076,1.172 0.003,4.22 0.003,4.22l-3.038,0Z" style="fill:rgb(255,255,255);fill-opacity:0.846008;"/>
    </svg>`);
    const MARKER_ICON_URL = `data:image/svg+xml;utf8,${MARKER}`;

    const BoatIcon = L.icon({
        iconUrl: MARKER_ICON_URL,
        iconSize: [24, 24],
        iconAnchor: [12, 12],
        popupAnchor: [0, 0],
    });

    const markers = [];

    const updateIconStyle = () => {
        for (const marker of markers) {
            const icon = marker._icon;
            if (!icon) {
                continue;
            }
            const heading = icon.getAttribute('data-heading');
            if (icon.style.transform.indexOf('rotateZ') === -1) {
                icon.style.transform = `${
                    icon.style.transform
                } rotateZ(${heading || 0}deg)`;
                icon.style.transformOrigin = 'center';
            }
        }
    };

    fetch('boats.json')
        .then(response => response.json())
        .then(result => result.result)
        .then(result => {
            try {
                let hue = 0;
                for (const boatName of Object.keys(result)) {
                    hue = (hue + 60) % 360;

                    const boat = result[boatName];

                    const layer = L.polyline(boat.track, {
                        color: `hsl(${hue}, 100%, 45%)`,
                        weight: 2,
                    }).addTo(map);

                    layer.on('mouseover', function() {
                        layer.setStyle({
                            weight: 4,
                        });
                    });

                    layer.on('mouseout', function() {
                        layer.setStyle({
                            weight: 2,
                        });
                    });

                    const marker = L.marker(boat.track[boat.track.length - 1], {
                        icon: BoatIcon,
                    }).addTo(map);

                    markers.push(marker);
                    marker._icon.setAttribute('data-heading', boat.heading);
                    marker.bindPopup(boatName);

                    updateIconStyle();
                }
            } catch (error) {
                console.error(`Error querying boats: ${error.message}`);
            }
        })
        .catch(error => {
            console.error(`Error querying boats: ${error.message}`);
        });

    // Handle some events. We need to update the rotation of icons ideally each time
    // leaflet re-renders. them.
    map.on('zoom', updateIconStyle);
    map.on('zoomend', updateIconStyle);
    map.on('viewreset', updateIconStyle);
});