OpenLayers示例代码：WMS时间
OpenLayers示例代码：WMS时间
<!DOCTYPE html>
<html>
<head>
<title>WMS Time</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
</head>
<body>
<div id="map" class="map"></div>
<div role="group" aria-label="Animation controls">
<button id="play" type="button">Play</button>
<button id="pause" type="button">Pause</button>
<span id="info"></span>
</div>
<script>
function threeHoursAgo() {
return new Date(Math.round(Date.now() / 3600000) * 3600000 - 3600000 * 3);
}
var extent = ol.proj.transformExtent([-126, 24, -66, 50], 'EPSG:4326', 'EPSG:3857');
var startDate = threeHoursAgo();
var frameRate = 0.5; // frames per second
var animationId = null;
var layers = [
new ol.layer.Tile({
source: new ol.source.Stamen({
layer: 'terrain'
})
}),
new ol.layer.Tile({
extent: extent,
source: new ol.source.TileWMS(/** @type {olx.source.TileWMSOptions} */ ({
attributions: ['Iowa State University'],
url: 'https://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r-t.cgi',
params: {'LAYERS': 'nexrad-n0r-wmst'}
}))
})
];
var map = new ol.Map({
layers: layers,
target: 'map',
view: new ol.View({
center: ol.extent.getCenter(extent),
zoom: 4
})
});
function updateInfo() {
var el = document.getElementById('info');
el.innerHTML = startDate.toISOString();
}
function setTime() {
startDate.setMinutes(startDate.getMinutes() + 15);
if (startDate > Date.now()) {
startDate = threeHoursAgo();
}
layers[1].getSource().updateParams({'TIME': startDate.toISOString()});
updateInfo();
}
setTime();
var stop = function() {
if (animationId !== null) {
window.clearInterval(animationId);
animationId = null;
}
};
var play = function() {
stop();
animationId = window.setInterval(setTime, 1000 / frameRate);
};
var startButton = document.getElementById('play');
startButton.addEventListener('click', play, false);
var stopButton = document.getElementById('pause');
stopButton.addEventListener('click', stop, false);
updateInfo();
</script>
</body>
</html>
说明：
OpenLayers示例代码：WMS时间
