leaflet-canvaslayer-field
Version:
A set of layers using canvas to draw ASCIIGrid or GeoTIFF files. This includes a basic raster layer (*ScalaField*) and an animated layer for vector fields, such as wind or currents (*VectorFieldAnim*)
59 lines (50 loc) • 2.24 kB
HTML
<html>
<head>
<title>VectorFieldAnim</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" href="//unpkg.com/leaflet@1.2.0/dist/leaflet.css" />
<link rel="stylesheet" href="examples.css" />
<link href="https://fonts.googleapis.com/css?family=Roboto:100,400" rel="stylesheet">
</head>
<body>
<h1 class="title mapTitle">VectorFieldAnim</h1>
<div id="map"></div>
<!-- CDN -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//npmcdn.com/leaflet@1.2.0/dist/leaflet.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.0/chroma.min.js"></script>
<!-- Plugin -->
<script src="dist/leaflet.canvaslayer.field.js"></script>
<script>
let map = L.map('map');
/* Basemap */
let url = 'https://cartodb-basemaps-{s}.global.ssl.fastly.net/dark_nolabels/{z}/{x}/{y}.png';
L.tileLayer(url, {
attribution: 'OSM & Carto',
subdomains: 'abcd',
maxZoom: 19
}).addTo(map);
/* Default vectorfield animation, from two ASCIIGrid files with u|v current velocity */
d3.text('data/Bay_U.asc', function (u) {
d3.text('data/Bay_V.asc', function (v) {
let vf = L.VectorField.fromASCIIGrids(u, v);
let layer = L.canvasLayer.vectorFieldAnim(vf).addTo(map);
map.fitBounds(layer.getBounds());
layer.on('click', function (e) {
if (e.value !== null) {
let vector = e.value;
let v = vector.magnitude().toFixed(2);
let d = vector.directionTo().toFixed(0);
let html = (`<span class="popupText">${v} m/s to ${d}°</span>`);
let popup = L.popup()
.setLatLng(e.latlng)
.setContent(html)
.openOn(map);
}
}); // {onClick: callback} inside 'options' is also supported when using layer contructor
});
});
</script>
</body>
</html>