D3 Examples - Neon map flyto

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<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title></title>
    <!--via https://www.mapbox.com/mapbox-gl-js/example/flyto-options/-->
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.11.1/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.11.1/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>
​
<style>
    #fly {
        display: block;
        position: relative;
        margin: 0px auto;
        width: 50%;
        height: 40px;
        padding: 10px;
        border: none;
        border-radius: 3px;
        font-size: 12px;
        text-align: center;
        color: #fff;
        background: #ee8a65;
    }
</style>
<div id='map'></div>
<br/>
<button onclick='fly();' id='fly'>Fly</button>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoidGhlbWFwc21pdGgiLCJhIjoiYTdmMDdiZjYxNzNmNzFiOGVjZDJiYzI5MGQ5N2VlMmQifQ.fUnAp-76Ka0d3v4oMNPhFw';
var start = [-99, 32];
var end = [-97.740, 30.274];
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/themapsmith/5bbc84d7',
    center: start,
    zoom: 4
});
​
var isAtStart = true;
​
function fly() {
    // depending on whether we're currently at point a or b, aim for
    // point a or b
    var target = isAtStart ? end : start;
​
    // and now we're at the opposite point
    isAtStart = !isAtStart;
​
    map.flyTo({
        // These options control the ending camera position: centered at
        // the target, at zoom level 9, and north up.
        center: target,
        zoom:  13,
        bearing: 0,
​
        // These options control the flight curve, making it move
        // slowly and zoom out almost completely before starting
        // to pan.
        speed: 0.5, // make the flying slow
        curve: 1, // change the speed at which it zooms out
​
        // This can be any easing function: it takes a number between
        // 0 and 1 and returns another number between 0 and 1.
        easing: function (t) {
            return t;
        }
    });
}
</script>
​
</body>
</html>
    