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*)
103 lines (90 loc) • 3.61 kB
HTML
<html>
<head>
<title>VectorFieldAnim / ColorBar</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">
<style>
.leaflet-control-colorBar-title {
font-family: 'Roboto', sans-serif;
font-weight: 100;
font-size: large;
}
</style>
</head>
<body>
<h1 class="title mapTitle">VectorFieldAnim and ColorBar</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");
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);
/*
Vectorfield animation with a colormap for magnitude + and associated colorBar
*/
d3.text('data/Cantabria_U.asc', function (u) {
d3.text('data/Cantabria_V.asc', function (v) {
let scaleFactor = 0.001; // to m/s
let vf = L.VectorField.fromASCIIGrids(u, v, scaleFactor);
var range = vf.range;
var scale = chroma.scale('OrRd').domain(range);
// Layer
var layer = L.canvasLayer.vectorFieldAnim(vf, {
paths: 2000,
color: scale,
velocityScale: 1 / 200
}).addTo(map);
/*
layer.setFilter(function(vector) {
// it might be needed to reduce the number of paths
if (vector) {
return vector.magnitude() > 1;
}
return false;
});
*/
map.fitBounds(layer.getBounds());
// Simple colorbar
var bar = L.control.colorBar(scale, range, {
title: 'Currents surface velocity (m/s)',
units: 'm/s',
steps: 100,
decimals: 1,
width: 350,
height: 20,
position: 'bottomright',
background: '#000',
textColor: 'white',
labels: [0, 0.5, 1.0, 1.5, 2.0],
labelFontSize: 9
}).addTo(map);
// info
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);
}
});
});
});
</script>
</body>
</html>