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animation.html
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animation.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Display a map</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.10.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.10.1/mapbox-gl.css" rel="stylesheet" />
<script src='https://unpkg.com/@turf/turf/turf.min.js'></script>
<style>
body {
margin: 0;
padding: 0;
}
button:focus {
outline:0;
}
#mapWrap {
height:750px;
position: relative;
/*max-width:600px;*/
margin:auto;
font-family: sans-serif;
}
.aniMap {
position: absolute;
bottom:0;
display: block;
width:100%;
height:100%;
}
#map {
height:100%;
}
#aniBtn {
position: absolute;
top: 10px;
right: 10px;
text-align: center;
margin: auto;
z-index: 10;
padding:20px 50px;
background:red;
font-size:16px;
font-weight:bold;
border-radius:3px;
border:none;
color:rgba(255,255,255,0.75);
}
#aniBtn:hover {
opacity:1;
color:rgba(255,255,255,1);
cursor: pointer;
}
</style>
</head>
<body>
<div id="mapWrap">
<button id="aniBtn" onclick="createAnimation()">Animate</button>
<div id="map" class="aniMap"></div>
</div>
<script>
let initLoad = true;
let mapStyle = 'mapbox://styles/mapbox/light-v10';
let mapCenter = [-73.95854473114014, 40.79173543794739];
let line = turf.lineString([
[
-73.95824432373047,
40.80068603561921
],
[
-73.94940376281738,
40.79691751000055
],
[
-73.96099090576172,
40.78099637745177
],
[
-73.96270751953125,
40.78151631145503
],
[
-73.96339416503906,
40.78216622323578
],
[
-73.96382331848145,
40.783141078983206
],
[
-73.96571159362793,
40.78385596410417
],
[
-73.96811485290527,
40.7848957832712
],
[
-73.96948814392088,
40.78535069903749
]
]);
// Put your own Mapbox Token in here
mapboxgl.accessToken = 'token';
const map = new mapboxgl.Map({
container: 'map',
style: mapStyle,
center: mapCenter,
minZoom: 5,
zoom: 14,
bearing: 29
});
map.on('load', function() {
initLineLayer(line);
});
function createAnimation() {
// calculate line distance
let lineDistance = turf.lineDistance(line);
// create an empty feature collection
let rectCollection = turf.featureCollection([]);
// how many points you want along the path (more = smoother animation)
let rects = 10;
// get speed
let speed = 100;
// calculate the distance between each point on the path
let segments = lineDistance / rects;
// what units do you want to use?
let units = 'miles';
// based on the number of points...
for (let i = 0; i <= rects; i++) {
// calculate point location for each segment
let pointonline = turf.along(line, (segments * i));
// push these coordinates to the feature collection we created
rectCollection.features.push(pointonline);
// once 'i' equals the number of points then we're done building our line
if (i == rects) {
// if this is the initial load add our point layer
if (initLoad) {
initPointLayer(rectCollection);
}
// function to animate line
moveLine(rectCollection, speed);
}
}
}
function moveLine(rects, speed) {
// empty array to hold animation frame coords
let lineCoords = [];
// animation loop
for (let i = 0; i <= rects.features.length-1; i++) {
(function(index) {
animateTimeout = setTimeout(function() {
// push each animation frame to array
lineCoords.push(rects.features[index].geometry.coordinates);
// we need at least two coordinates to make a linestring
if (i >= 1) {
let newLine = turf.lineString(lineCoords);
// update line layer with latest animation frame
map.getSource('lineSource').setData(newLine);
// follow the line
// map.flyTo({
// center:[rects.features[index].geometry.coordinates[0], rects.features[index].geometry.coordinates[1]],
// speed: 0.1
// });
}
// if we're at the end of the loop...
if (i === rects.features.length-1) {
console.log('done drawing');
}
// how quickly do we want to iterate through our animation
}, i * speed);
})(i);
}
}
function initLineLayer(line){
map.addSource('lineSource', {
type: 'geojson',
data: line
});
map.addLayer({
id: 'line',
type: 'line',
source: 'lineSource',
layout: {
'line-join': 'round',
'line-cap': 'round'
},
paint: {
'line-color': 'red',
'line-width': 3
}
});
}
function initPointLayer(rects){
initLoad = false;
map.addSource('pointSource', {
type: 'geojson',
data: rects
});
map.addLayer({
id: 'point',
type: 'circle',
source: 'pointSource',
paint: {
'circle-radius': 4,
'circle-color': 'purple'
}
});
}
</script>
</body>
</html>