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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css"
integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ=="
crossorigin=""/>
<script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"
integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw=="
crossorigin=""></script>
<!--[if lte IE 8]><link rel="stylesheet" --><!--href="http://leaflet.cloudmade.com/dist/leaflet.ie.css" --><!--/><![endif]-->
<script type="text/javascript"
src="https://stamen-maps.a.ssl.fastly.net/js/tile.stamen.js"></script>
<script src=" https://unpkg.com/@joergdietrich/leaflet.terminator@1.0.0/L.Terminator.js"></script>
<script type="text/javascript" src="js/shCore.js"></script>
<script type="text/javascript"
src="js/shBrushJScript.js"></script>
<script type="text/javascript" src="js/shBrushXml.js"></script>
<style type="text/css">
.map {
width: 720px;
height: 510px;
margin: 0 0 1em 0;
}
</style>
<style type="text/css">
.map2 {
width: 720px;
height: 510px;
margin: 0 0 1em 0;
}
</style>
<link href="css/shCore.css" rel="stylesheet" type="text/css" />
<link href="css/shThemeDefault.css" rel="stylesheet" type="text/css" />
<link rel="stylesheet" type="text/css" href="css/style.css" />
<title>Night and Day on Earth</title>
</head>
<body>
<div id="Navigation">
<ul>
<li><a href="http://www.usm.lmu.de/people/dietrich/">Jörg
Dietrich's other page</a></li>
<li class="sel">Leaflet.Terminator</li>
<li>
<div id="Drop">
<ul>
<li><a href="https://github.com/joergdietrich/Leaflet.Terminator">
Leaftlet.Terminator on GitHub</a>
</li>
<li class="sel">Leaflet.Terminator Example</li>
</ul>
</div>
</li>
</ul>
</div>
<div id="Content">
<h1>Night and Day on Earth</h1>
<p>
Leaflet.Terminator is a simple plug-in to
the <a href="http://leafletjs.com">Leaflet</a> library to
overlay day and night regions on maps. You can get the source
code on <a
href="https://github.com/joergdietrich/Leaflet.Terminator">
GitHub</a>. The example below shows a continously updating
world map.
</p>
<div class="map" id="watercolor"></div>
<script type="text/javascript">
var southWest = new L.LatLng(-90, -270),
northEast = new L.LatLng(90, 270);
var base = new L.StamenTileLayer("watercolor");
var t = L.terminator();
var map = new L.Map("watercolor", {
center: new L.LatLng(0, 0),
worldCopyJump: true,
zoom: 1,
maxZoom: 10,
layers: [base]
});
t.addTo(map);
setInterval(function(){updateTerminator(t)}, 500);
function updateTerminator(t) {
t.setTime();
}
</script>
<p>
To use Leaflet.Terminator, include
</p>
<pre class="brush: html">
<script src=" https://unpkg.com/@joergdietrich/leaflet.terminator@1.0.0/L.Terminator.js"></script>
</pre>
in your html. Alternatively, if you use npm, Leaflet.Terminator is
available
as <a href="https://www.npmjs.com/package/@joergdietrich/leaflet.terminator">@joergdietrich/leaflet.terminator</a>.
Generate your Leaflet map as usual and then:
<pre class="brush: js">
L.terminator().addTo(map);
</pre>
<p>
The <code>L.terminator()</code> method returns a <a
href="http://leafletjs.com/reference.html#polygon">Polygon
object</a>, which can be manipulated in the usual ways. For
example, the auto-updating map above uses the following code to
redraw the terminator every 0.5 seconds:
</p>
<pre class="brush: js; gutter: true; highlight: [3]">
var t = L.terminator();
t.addTo(map);
setInterval(function(){updateTerminator(t)}, 500);
function updateTerminator(t) {
t.setTime();
}</pre>
<p>
You can zoom in and watch the terminator move. However, the
equations used by Leaflet.Terminator are accurate only to a few
seconds to minimize computing time. More importantly, they
ignore refraction, which changes the actual sun rise and set
times by several minutes. Also keep in mind that the exact times
depend on terrain – your altitude and your view to the
horizon.
</p>
<p>
Leaflet.Terminator computes the polygon from longitudes
-360° to +360°, i.e., twice around the Earth to allow
for some panning in world maps. Nevertheless, it is probably a
good idea to either use the <a
href="http://leafletjs.com/reference.html#map-worldcopyjump"><code>worldCopyJump</code></a>
or <a
href="http://leafletjs.com/reference.html#map-maxbounds"><code>maxBounds</code></a>
options when instantiating the map.
</p>
<p>
Leaflet.Terminator extends the <a
href="http://leafletjs.com/reference.html#polygon"><code>Polygon</code></a>
class and thus <code>L.terminator()</code> takes all <a
href="http://leafletjs.com/reference.html#polyline-options">Polyline
options</a>. In addition <code>L.terminator()</code>
understands the following options:
</p>
<table class="reference">
<tr>
<th>Option</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
<tr>
<td><code>resolution</code></td>
<td><code>Number</code></td>
<td><code>2</code></td>
<td>
Set the separation at which Polygon points are
computed. Polygon points are located at fixed longitude
points separated by <code>1°/resolution.</code>
</td>
</tr>
<tr>
<td><code>time</code> </td>
<td><code>value</code>
<br />
<br />
<code>dateString</code>
<br />
<br />
<code>year, month, day [, hour, minute, second,
millisecond]</code>
</td>
<td><code>null</code></td>
<td>Set the time for which the terminator is computed. The
default is the present time. Any expression understood by <a
href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date"><code>Date()</code></a>
and which evaluates to <code>true</code> can be used.
</td>
</tr>
</table>
<p>
The map below shows the terminator across northern Europe
shortly before summer solstice generated by calling
</p>
<pre class="brush: js">
L.terminator({time: "2013-06-20T21:00:00Z"});
</pre>
<div class="map2" id="fixed-terminator"></div>
<script type="text/javascript">
var southWest = new L.LatLng(-90, -270),
northEast = new L.LatLng(90, 270);
var base2 = new L.StamenTileLayer("toner-lite");
var map2 = new L.Map("fixed-terminator", {
center: new L.LatLng(65, 0),
worldCopyJump: true,
maxBounds: new L.LatLngBounds(southWest, northEast),
zoom: 3,
layers: [base2]
});
L.terminator({time: "2013-06-20T21:00:00Z"}).addTo(map2);
</script>
<p>
Leaflet.Terminator modifies the default Path options as follows:
</p>
<table class="reference">
<tr>
<th>Option</th>
<th>Value</th>
</tr>
<tr>
<td><code>color</code></td>
<td><code>'#00'</code></td>
</tr>
<tr>
<td><code>fillColor</code></td>
<td><code>'#00'</code></td>
</tr>
<tr>
<td><code>fillOpacity</code></td>
<td><code>0.5</code></td>
</tr>
</table>
<script type="text/javascript">
SyntaxHighlighter.defaults['gutter'] = false;
SyntaxHighlighter.defaults['toolbar'] = false;
SyntaxHighlighter.all()
</script>
</div>
<div id="Footer">
<hr />
<p>
<a href="mailto:astro@joergdietrich.com">Jörg Dietrich</a><br />
<!-- hhmts start -->Last modified: Mon Jun 11 13:40:51 CET 2018 <!-- hhmts end -->
</p>
</div>
</body>
</html>