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445 lines
20 KiB
HTML
445 lines
20 KiB
HTML
2 weeks ago
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<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=Edge">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<script>
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var gaProperty = 'UA-2577926-1';
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// Disable tracking if the opt-out cookie exists.
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var disableStr = 'ga-disable-' + gaProperty;
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if (document.cookie.indexOf(disableStr + '=true') > -1) {
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window[disableStr] = true;
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}
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function gaOptout() {
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document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = true;
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}
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function gaOptoutRevoke() {
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document.cookie = disableStr + '=false; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = false;
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}
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</script>
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<!-- Global site tag (gtag.js) - Google Analytics -->
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<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2577926-1"></script>
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<script>
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
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</script>
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<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
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<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
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<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
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<script>
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window.addEventListener("load", function() {
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window.cookieconsent.initialise({
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'palette': {
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'popup': {
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'background': '#eaf7f7',
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'text': '#5c7291'
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},
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'button': {
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'background': '#56cbdb',
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'text': '#ffffff'
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}
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},
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'theme': 'edgeless',
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'type': 'opt-out',
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'onInitialise': function (status) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onStatusChange': function(status, chosenBefore) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onRevokeChoice': function() {
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gaOptoutRevoke()
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}
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})
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});
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</script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
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<link rel="stylesheet" href="./css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="https://unpkg.com/elm-pep"></script>
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<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
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<link rel="stylesheet" href="webgl-sea-level.css">
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<title>Sea Level (with WebGL)</title>
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</head>
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<body>
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<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
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<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt=""> OpenLayers</a>
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
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<span class="navbar-toggler-icon"></span>
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</button>
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<!-- menu items that get hidden below 768px width -->
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<nav class="collapse navbar-collapse" id="olmenu">
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<ul class="nav navbar-nav ml-auto">
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<li class="nav-item dropdown">
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<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
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<a class="dropdown-item" href="../doc/">Docs</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
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<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
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<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
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<a class="dropdown-item" href="/workshop/"><i class="fa fa-graduation-cap fa-fw mr-2 fa-lg"></i>Workshop</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
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</div>
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</li>
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<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
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<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
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<li class="nav-item dropdown">
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<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
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<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
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<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
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</div>
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</li>
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</ul>
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</nav>
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</header>
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<div class="container-fluid line-numbers">
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<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
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<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
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This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
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</div>
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<div class="row-fluid">
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<a href="#" id="codepen-button" class="btn btn-link float-right">
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<i class="fa fa-codepen fa-lg"></i> Edit
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</a>
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<div class="span12">
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<h4 id="title">Sea Level (with WebGL)</h4>
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<p class="tags">
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<span class="badge-group">
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<a
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href="./index.html?q=webgl" class="badge badge-info">webgl</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="webgl"
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data-content="
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<a class="list-group-item list-group-item-action" href="./cog-stretch.html">Band Contrast Stretch</a>
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<a class="list-group-item list-group-item-action" href="./cog-style.html">Change Tile Layer Style</a>
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<a class="list-group-item list-group-item-action" href="./heatmap-earthquakes.html">Earthquakes Heatmap</a>
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<a class="list-group-item list-group-item-action" href="./filter-points-webgl.html">Filtering features with WebGL</a>
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<a class="list-group-item list-group-item-action" href="./icon-sprite-webgl.html">Icon Sprites with WebGL</a>
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<a class="list-group-item list-group-item-action" href="./webgl-layer-swipe.html">Layer Swipe (WebGL)</a>
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<a class="list-group-item list-group-item-action" href="./numpytile.html">Rendering 16-bit NumpyTiles</a>
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<a class="list-group-item list-group-item-action active" href="./webgl-sea-level.html">Sea Level (with WebGL)</a>
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<a class="list-group-item list-group-item-action" href="./webgl-shaded-relief.html">Shaded Relief (with WebGL)</a>
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<a class="list-group-item list-group-item-action" href="./webgl-points-layer.html">WebGL points layer</a>
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<a class="list-group-item list-group-item-action" href="./webgl-tile-style.html">WebGL Tile Layer Styles</a>
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<a class="list-group-item list-group-item-action" href="./webgl-tiles.html">WebGL Tiles</a>"
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tabindex="0"
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>12</a>
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</span>
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<span class="badge-group">
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<a
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href="./index.html?q=math" class="badge badge-info">math</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="math"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./webgl-sea-level.html">Sea Level (with WebGL)</a>"
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tabindex="0"
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>1</a>
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</span>
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<span class="badge-group">
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<a
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href="./index.html?q=flood" class="badge badge-info">flood</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="flood"
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data-content="
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<a class="list-group-item list-group-item-action" href="./sea-level.html">Sea Level</a>
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<a class="list-group-item list-group-item-action active" href="./webgl-sea-level.html">Sea Level (with WebGL)</a>"
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tabindex="0"
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>2</a>
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</span>
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</p>
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<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
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<div class="modal-dialog modal-dialog-scrollable" role="document">
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<div class="modal-content">
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<div class="modal-header">
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<h5 class="modal-title" id="tag-example-title"></h5>
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<button type="button" class="close" data-dismiss="modal" aria-label="Close">
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<span aria-hidden="true">×</span>
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</button>
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</div>
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<div class="modal-body">
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<div class="list-group"></div>
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</div>
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</div>
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</div>
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</div>
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<div id="map" class="map"></div>
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<label>
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Sea level
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<input id="level" type="range" min="0" max="100" value="1"/>
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+<span id="output"></span> m
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</label>
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<br>
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Go to
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<a class="location" data-center="-122.3267,37.8377" data-zoom="11">San Francisco</a>,
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<a class="location" data-center="-73.9338,40.6861" data-zoom="11">New York</a>,
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<a class="location" data-center="72.9481,18.9929" data-zoom="11">Mumbai</a>, or
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<a class="location" data-center="120.831,31.160" data-zoom="9">Shanghai</a>
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</div>
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<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
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<input id="codesandbox-params" type="hidden" name="parameters">
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</form>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<p id="shortdesc">Render sea level at different elevations</p>
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<div id="docs"><p>
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The <code>style</code> property of a WebGL tile layer accepts a <code>color</code> expression that
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can be used to modify pixel values before rendering. Here, RGB tiles representing elevation
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data are loaded and rendered so that values at or below sea level are blue, and values
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above sea level are transparent. The <code>color</code> expression operates on normalized pixel
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values ranging from 0 to 1. The <code>band</code> operator is used to select normalized values
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from a single band.
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</p><p>
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After converting the normalized RGB values to elevation, the <code>case</code> expression
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is used to pick colors to apply at a given elevation. Instead of using constant
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numeric values as the stops in the colors array, the <code>var</code> operator allows you to
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use a value that can be modified by your application. When the user drags the
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sea level slider, the <code>layer.updateStyleVariables()</code> function is called to update
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the <code>level</code> style variable with the value from the slider.
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</p>
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</div>
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</div>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">main.js</h5>
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<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
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import Map from 'ol/Map';
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import TileLayer from 'ol/layer/WebGLTile';
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import View from 'ol/View';
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import XYZ from 'ol/source/XYZ';
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import {fromLonLat} from 'ol/proj';
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const key = 'Get your own API key at https://www.maptiler.com/cloud/';
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const attributions =
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'<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
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'<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
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// band math operates on normalized values from 0-1
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// so we scale by 255 to align with the elevation formula
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// from https://cloud.maptiler.com/tiles/terrain-rgb/
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const elevation = [
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'+',
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-10000,
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[
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'*',
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0.1 * 255,
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[
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'+',
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['*', 256 * 256, ['band', 1]],
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['+', ['*', 256, ['band', 2]], ['band', 3]],
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],
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],
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];
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const layer = new TileLayer({
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opacity: 0.6,
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source: new XYZ({
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url:
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'https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key=' + key,
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tileSize: 512,
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maxZoom: 12,
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}),
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style: {
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variables: {
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level: 0,
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},
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color: [
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'case',
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// use the `level` style variable to determine the color
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['<=', elevation, ['var', 'level']],
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[139, 212, 255, 1],
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[139, 212, 255, 0],
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],
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},
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});
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const map = new Map({
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target: 'map',
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layers: [
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new TileLayer({
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source: new XYZ({
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url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
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attributions: attributions,
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tileSize: 512,
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maxZoom: 22,
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}),
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}),
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layer,
|
||
|
|
],
|
||
|
|
view: new View({
|
||
|
|
center: fromLonLat([-122.3267, 37.8377]),
|
||
|
|
zoom: 11,
|
||
|
|
}),
|
||
|
|
});
|
||
|
|
|
||
|
|
const control = document.getElementById('level');
|
||
|
|
const output = document.getElementById('output');
|
||
|
|
const listener = function () {
|
||
|
|
output.innerText = control.value;
|
||
|
|
layer.updateStyleVariables({level: parseFloat(control.value)});
|
||
|
|
};
|
||
|
|
control.addEventListener('input', listener);
|
||
|
|
control.addEventListener('change', listener);
|
||
|
|
output.innerText = control.value;
|
||
|
|
|
||
|
|
const locations = document.getElementsByClassName('location');
|
||
|
|
for (let i = 0, ii = locations.length; i < ii; ++i) {
|
||
|
|
locations[i].addEventListener('click', relocate);
|
||
|
|
}
|
||
|
|
|
||
|
|
function relocate(event) {
|
||
|
|
const data = event.target.dataset;
|
||
|
|
const view = map.getView();
|
||
|
|
view.setCenter(fromLonLat(data.center.split(',').map(Number)));
|
||
|
|
view.setZoom(Number(data.zoom));
|
||
|
|
}
|
||
|
|
</code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">index.html</h5>
|
||
|
|
<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>Sea Level (with WebGL)</title>
|
||
|
|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
|
||
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
||
|
|
<!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x -->
|
||
|
|
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
|
||
|
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
|
||
|
|
<style>
|
||
|
|
.map {
|
||
|
|
width: 100%;
|
||
|
|
height:400px;
|
||
|
|
}
|
||
|
|
#level {
|
||
|
|
display: inline-block;
|
||
|
|
width: 150px;
|
||
|
|
vertical-align: text-bottom;
|
||
|
|
}
|
||
|
|
|
||
|
|
a.location {
|
||
|
|
cursor: pointer;
|
||
|
|
}
|
||
|
|
|
||
|
|
#map {
|
||
|
|
background: #8bd4ff;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div id="map" class="map"></div>
|
||
|
|
<label>
|
||
|
|
Sea level
|
||
|
|
<input id="level" type="range" min="0" max="100" value="1"/>
|
||
|
|
+<span id="output"></span> m
|
||
|
|
</label>
|
||
|
|
<br>
|
||
|
|
Go to
|
||
|
|
<a class="location" data-center="-122.3267,37.8377" data-zoom="11">San Francisco</a>,
|
||
|
|
<a class="location" data-center="-73.9338,40.6861" data-zoom="11">New York</a>,
|
||
|
|
<a class="location" data-center="72.9481,18.9929" data-zoom="11">Mumbai</a>, or
|
||
|
|
<a class="location" data-center="120.831,31.160" data-zoom="9">Shanghai</a>
|
||
|
|
<script src="main.js"></script>
|
||
|
|
</body>
|
||
|
|
</html></code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">package.json</h5>
|
||
|
|
<pre><code id="example-pkg-source" class="language-json">{
|
||
|
|
"name": "webgl-sea-level",
|
||
|
|
"dependencies": {
|
||
|
|
"ol": "6.12.0"
|
||
|
|
},
|
||
|
|
"devDependencies": {
|
||
|
|
"parcel": "^2.0.0"
|
||
|
|
},
|
||
|
|
"scripts": {
|
||
|
|
"start": "parcel index.html",
|
||
|
|
"build": "parcel build --public-url . index.html"
|
||
|
|
}
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
|
||
|
|
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
|
||
|
|
<script src="./resources/prism/prism-1.20.0.min.js"></script>
|
||
|
|
<script src="./resources/common.js"></script>
|
||
|
|
<script src="common.js"></script>
|
||
|
|
<script src="webgl-sea-level.js"></script>
|
||
|
|
<script>
|
||
|
|
$('#tag-example-list').on('show.bs.modal', function (event) {
|
||
|
|
const button = $(event.relatedTarget); // Button that triggered the modal
|
||
|
|
const title = button.data('title');
|
||
|
|
const content = button.data('content');
|
||
|
|
const modal = $(this)
|
||
|
|
modal.find('.modal-title').text(title);
|
||
|
|
modal.find('.modal-body').html(content);
|
||
|
|
});
|
||
|
|
|
||
|
|
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
|
||
|
|
fetch(packageUrl).then(function(response) {
|
||
|
|
return response.json();
|
||
|
|
}).then(function(json) {
|
||
|
|
var latestVersion = json.version;
|
||
|
|
document.getElementById('latest-version').innerHTML = latestVersion;
|
||
|
|
var url = window.location.href;
|
||
|
|
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
|
||
|
|
var cookieText = 'dismissed=-' + latestVersion + '-';
|
||
|
|
var dismissed = document.cookie.indexOf(cookieText) != -1;
|
||
|
|
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
|
||
|
|
var link = url.replace(branchSearch[0], '/latest/examples/');
|
||
|
|
fetch(link, {method: 'head'}).then(function(response) {
|
||
|
|
var a = document.getElementById('latest-link');
|
||
|
|
a.href = response.status == 200 ? link : '../../latest/examples/';
|
||
|
|
});
|
||
|
|
var latestCheck = document.getElementById('latest-check');
|
||
|
|
latestCheck.style.display = '';
|
||
|
|
document.getElementById('latest-dismiss').onclick = function() {
|
||
|
|
latestCheck.style.display = 'none';
|
||
|
|
document.cookie = cookieText;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
</script>
|
||
|
|
</body>
|
||
|
|
</html>
|