[GIS] Adjust leaflet routing machine draw (animate) route speed

animationleafletopen-source-gisopen-source-routing-machineopenstreetmap

I use leaflet routing machine and it's working fine with me.

enter image description here

Here is my code:

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Test</title>
    @Scripts.Render("~/bundles/jquery")
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css"
          integrity="sha512-puBpdR0798OZvTTbP4A8Ix/l+A4dHDD0DGqYW6RQ+9jxkRFclaxxQb/SJAWZfWAkuyeQUytO7+7N4QKrDh+drA=="
          crossorigin="" />

    <!-- Make sure you put this AFTER Leaflet's CSS -->
    <script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js"
            integrity="sha512-nMMmRyTVoLYqjP9hrbed9S+FzjZHW5gY1TWCHA5ckwXZBadntCNs8kEqAWdrb9O7rxbCaA4lKTIWjDXZxflOcA=="
            crossorigin=""></script>

    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.2.0/dist/leaflet.css" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet-routing-machine@latest/dist/leaflet-routing-machine.css" />
    <script src="https://unpkg.com/leaflet@1.2.0/dist/leaflet.js"></script>
    <script src="https://unpkg.com/leaflet-routing-machine@latest/dist/leaflet-routing-machine.js"></script>

    <style>
        #mapid {
            height: 480px;
        }
    </style>
</head>
<body>
    <div id="mapid"></div>
    <div id="distancetravelled"></div>

    <script>
        // set map view to a specefic lat, long in Egypt
        var mymap = L.map('mapid').setView([30.026300, 31.496773], 13);

        L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}{r}.png', {
            attribution: '© OpenStreetMap contributors'
        }).addTo(mymap);

        var control = L.Routing.control({
            waypoints: [
                L.latLng(57.74, 11.94),
                L.latLng(57.6792, 11.949)
            ],
            routeWhileDragging: true
        }).addTo(mymap);

        console.log(control);

    </script>
</body>
</html>

It draws the line immediately after I load the map, but I want it to draw the line slowly like this sample for example
enter image description here

Best Answer

I achieved this animation using only CSS. See the following tutorial: https://css-tricks.com/svg-line-animation-works/#article-header-id-7 (Note: the tutorial covers other interesting line animations as well!)

First of all add the class .animate to the routing line:

var control = L.Routing.control({
    waypoints: [
        L.latLng(57.74, 11.94),
        L.latLng(57.6792, 11.949)
    ],
    lineOptions: {
        styles: [{className: 'animate'}] // Adding animate class
    },
    routeWhileDragging: true
}).addTo(mymap);

And add the following CSS to your page:

path.leaflet-interactive.animate {
    stroke-dasharray: 1920;
    stroke-dashoffset: 1920;
    animation: dash 20s linear 3s forwards;
}

@keyframes dash {
    to {
        stroke-dashoffset: 0;
    }
}

The speed of the route is determined by the width of the stroke-dasharray and the animation-speed. In this example the route-animation will travel 1920px in 20 seconds. You can speed up or slow down the animation by adjusting either one of those CSS-values.

In this example I have also delayed the animation for 3 seconds, to give the map tiles a chance to load completely.

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