我在下面结合了 Emma 和 Moritz 的代码；
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Animate a point along a route</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v2.0.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v2.0.1/mapbox-gl.css" rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
.overlay {
position: absolute;
top: 10px;
left: 10px;
}
.overlay button {
font: 600 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
background-color: #3386c0;
color: #fff;
display: inline-block;
margin: 0;
padding: 10px 20px;
border: none;
cursor: pointer;
border-radius: 3px;
}
.overlay button:hover {
background-color: #4ea0da;
}
</style>
<script src="https://cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>
<div id="map"></div>
<div class="overlay">
<button id="replay">Replay</button>
</div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoieW9jaGkiLCJhIjoiY2tjZThvdWExMDV2dDJxcDgxZzBwbzlxYSJ9.M0yRA6SXDMRgXzXGuYnvsg';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [6.161062, 45.36362],
zoom: 9
});
var coords = [
[6.157903, 45.361839],
[6.15835, 45.361932],
[6.161408,45.3634445],
[6.161558, 45.363508],
[6.161307, 45.363462],
[6.1610, 45.363570],
[6.161057, 45.36362]
];
var route = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': coords
}
}
]
};
var marker = new mapboxgl.Marker({
color: '#EC0868',
className: 'marker'});
// Calculate the distance in kilometers between route start/end point.
var lineDistance = turf.length(route.features[0]);
var arc = [];
// Number of steps to use in the arc and animation, more steps means
// a smoother arc and animation, but too many steps will result in a
// low frame rate
var steps = 500;
// Draw an arc between the `origin` & `destination` of the two points
for (var i = 0; i < lineDistance; i += lineDistance / steps) {
var segment = turf.along(route.features[0], i);
arc.push(segment.geometry.coordinates);
}
// Update the route with calculated arc coordinates
route.features[0].geometry.coordinates = arc;
// Used to increment the value of the point measurement against the route.
var counter = 0;
map.on('load', function () {
// Add a source and layer displaying a point which will be animated in a circle.
map.addSource('route', {
'type': 'geojson',
'data': route
});
map.addLayer({
'id': 'route',
'source': 'route',
'type': 'line',
'paint': {
'line-width': 2,
'line-color': '#007cbf'
}
});
marker.setLngLat(route.features[0].geometry.coordinates[0]).addTo(map);
fitMap(map, coords);
function animate() {
// Update point geometry to a new position based on counter denoting
// the index to access the arc
marker.setLngLat(route.features[0].geometry.coordinates[counter]);
counter = counter + 1;
// Request the next frame of animation as long as the end has not been reached
if (counter < steps) {
requestAnimationFrame(animate);
}
}
document
.getElementById('replay')
.addEventListener('click', function () {
// Set the coordinates of the original point back to origin
marker.setLngLat(route.features[0].geometry.coordinates[0])
// Reset the counter
counter = 0;
// Restart the animation
animate(counter);
});
// Start the animation
animate(counter);
});
function fitMap(map, coords) {
var bounds = coords.reduce(function (bounds, coord) {
return bounds.extend(coord);
}, new mapboxgl.LngLatBounds(coords[0], coords[0]));
map.fitBounds(bounds, {
padding: 30
});
}
https://codepen.io/OttyLab/pen/GRjBjwq