Mapbox GL JS Marker Blip

index.html

<div id='map'></div>

mapbox-gl-js-marker-blip.markdown

Mapbox GL JS Marker Blip

Using Mapbox GL JS to simulate a radar blip.

A Pen by geografa on CodePen.

License.

script.js

// DID YOU FORK THIS EXAMPLE?
// Enter your access token below
// and uncomment the line to keep your
// project online!
// Need a token? Create free account 
// mapbox.com/signup
// ***********************************************
// mapboxgl.accessToken = 'YOUR-ACCESS-TOKEN-HERE';
// ***********************************************
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v8',
    center: [0, 0],
    zoom: 2
});

var framesPerSecond = 15; 
var initialOpacity = 1
var opacity = initialOpacity;
var initialRadius = 6;
var radius = initialRadius;
var maxRadius = 18;

map.on('load', function () {

    // Add a source and layer displaying a point which will be animated in a circle.
    map.addSource('point', {
        "type": "geojson",
        "data": {
            "type": "Point",
            "coordinates": [
                0, 0
            ]
        }
    });

    map.addLayer({
        "id": "point",
        "source": "point",
        "type": "circle",
        "paint": {
            "circle-radius": initialRadius,
            "circle-radius-transition": {duration: 0},
            "circle-opacity-transition": {duration: 0},
            "circle-color": "#007cbf"
        }
    });

    map.addLayer({
        "id": "point1",
        "source": "point",
        "type": "circle",
        "paint": {
            "circle-radius": initialRadius,
            "circle-color": "#007cbf"
        }
    });


    function animateMarker(timestamp) {
        setTimeout(function(){
            requestAnimationFrame(animateMarker);

            radius += (maxRadius - radius) / framesPerSecond;
            opacity -= ( .9 / framesPerSecond );

            map.setPaintProperty('point', 'circle-radius', radius);
            map.setPaintProperty('point', 'circle-opacity', opacity);

            if (opacity <= 0) {
                radius = initialRadius;
                opacity = initialOpacity;
            } 

        }, 1000 / framesPerSecond);
        
    }

    // Start the animation.
    animateMarker(0);
});

scripts

<script src="https://www.mapbox.com/help/data/codepen-token.js"></script>

style.css

body {
  margin: 0;
  padding: 0;
}

#map {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100%;
}