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Slowly fly to a location

Use flyTo with flyOptions to slowly zoom to a location.

<!DOCTYPE html>
<html lang="en">
    <title>Slowly fly to a location</title>
    <meta property="og:description" content="Use flyTo with flyOptions to slowly zoom to a location." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='' />
    <script src=''></script>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    #fly {
        display: block;
        position: absolute;
        top: 20px;
        left: 50%;
        transform: translate(-50%);
        width: 50%;
        height: 40px;
        padding: 10px;
        border: none;
        border-radius: 3px;
        font-size: 12px;
        text-align: center;
        color: #fff;
        background: #ee8a65;
<div id="map"></div>
<br />
<button id="fly">Fly</button>
    const start = [-74.5, 40];
    const end = [74.5, 40];
    const map = new maplibregl.Map({
        container: 'map',
        center: start,
        zoom: 9

    let isAtStart = true;

    document.getElementById('fly').addEventListener('click', () => {
        // depending on whether we're currently at point a or b, aim for
        // point a or b
        const target = isAtStart ? end : start;

        // and now we're at the opposite point
        isAtStart = !isAtStart;

            // These options control the ending camera position: centered at
            // the target, at zoom level 9, and north up.
            center: target,
            zoom: 9,
            bearing: 0,

            // These options control the flight curve, making it move
            // slowly and zoom out almost completely before starting
            // to pan.
            speed: 0.2, // 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 (t) {
                return t;

            // this animation is considered essential with respect to prefers-reduced-motion
            essential: true