答案 0 :(得分:3)
我在这个jsfiddle中准备了一个简单的动画:
https://jsfiddle.net/2mws8y3q/
var animationStep = 50;
var step = 0;
let dashArraySeq = [
[0, 4, 3],
[1, 4, 2],
[2, 4, 1],
[3, 4, 0],
[0, 1, 3, 3],
[0, 2, 3, 2],
[0, 3, 3, 1]
];
setInterval(() => {
step = (step + 1) % dashArraySeq.length;
map.setPaintProperty(layerId, 'line-dasharray', dashArraySeq[step]);
}, animationStep);
答案 1 :(得分:2)
这是我在Map#setPaintProperty(xx, 'line-dasharray', yy)
函数中使用setInterval
进行虚线动画的初步尝试。
通过一些创造性和数据预处理可以消除一些渲染工件。
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title></title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.34.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.34.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoibHVjYXN3b2oiLCJhIjoiY2l5Nmg4cWU1MDA0ejMzcDJtNHJmZzJkcyJ9.WhcEdTYQH6sSw2pm0RSP9Q';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v9',
center: [-122.486052, 37.830348],
zoom: 15
});
map.on('load', function () {
map.addLayer({
"id": "route",
"type": "line",
"source": {
"type": "geojson",
"data": {
"type": "Feature",
"properties": {},
"geometry": {
"type": "LineString",
"coordinates": [
[-122.48369693756104, 37.83381888486939],
[-122.48348236083984, 37.83317489144141],
[-122.48339653015138, 37.83270036637107],
[-122.48356819152832, 37.832056363179625],
[-122.48404026031496, 37.83114119107971],
[-122.48404026031496, 37.83049717427869],
[-122.48348236083984, 37.829920943955045],
[-122.48356819152832, 37.82954808664175],
[-122.48507022857666, 37.82944639795659],
[-122.48610019683838, 37.82880236636284],
[-122.48695850372314, 37.82931081282506],
[-122.48700141906738, 37.83080223556934],
[-122.48751640319824, 37.83168351665737],
[-122.48803138732912, 37.832158048267786],
[-122.48888969421387, 37.83297152392784],
[-122.48987674713133, 37.83263257682617],
[-122.49043464660643, 37.832937629287755],
[-122.49125003814696, 37.832429207817725],
[-122.49163627624512, 37.832564787218985],
[-122.49223709106445, 37.83337825839438],
[-122.49378204345702, 37.83368330777276]
]
}
}
},
"layout": {
"line-join": "round",
"line-cap": "butt"
},
"paint": {
"line-color": "#888",
"line-width": 8
}
});
var dashLength = 1;
var gapLength = 3;
// We divide the animation up into 40 steps to make careful use of the finite space in
// LineAtlas
var steps = 40;
// A # of steps proportional to the dashLength are devoted to manipulating the dash
var dashSteps = steps * dashLength / (gapLength + dashLength);
// A # of steps proportional to the gapLength are devoted to manipulating the gap
var gapSteps = steps - dashSteps;
// The current step #
var step = 0;
setInterval(function() {
step = step + 1;
if (step >= steps) step = 0;
var t, a, b, c, d;
if (step < dashSteps) {
t = step / dashSteps;
a = (1 - t) * dashLength;
b = gapLength;
c = t * dashLength;
d = 0;
} else {
t = (step - dashSteps) / (gapSteps);
a = 0;
b = (1 - t) * gapLength;
c = dashLength;
d = t * gapLength;
}
map.setPaintProperty("route", "line-dasharray", [a, b, c, d]);
}, 25);
});
</script>
</body>
</html>
答案 2 :(得分:0)
不直接。我能想到的最接近的是将line-dasharray
设置为类似10,5,0
的内容,然后在很短的时间后将其更改为9,5,1
,然后更改为8,5,2
等。