mirror of
https://github.com/Viglino/ol-ext.git
synced 2025-12-08 19:26:29 +00:00
149 lines
4.7 KiB
HTML
149 lines
4.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<!--
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Copyright (c) 2015 Jean-Marc VIGLINO,
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released under CeCILL-B (french BSD like) licence: http://www.cecill.info/
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-->
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<title>ol-ext: layer preview</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<!-- jQuery -->
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<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.0.min.js"></script>
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<!-- Openlayers -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@latest/ol.css" />
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/ol@latest/dist/ol.js"></script>
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<!-- ol-ext -->
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<link rel="stylesheet" href="../../dist/ol-ext.css" />
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<script type="text/javascript" src="../../dist/ol-ext.js"></script>
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<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
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<script src="https://unpkg.com/elm-pep"></script>
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<link rel="stylesheet" href="../style.css" />
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<style>
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#preview .img {
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display:block;
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width:128px;
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height:92px;
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position:relative;
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overflow:hidden;
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margin-top:1em;
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box-shadow: 2px 2px 2px 2px rgba(0, 0, 0, 0.5)
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}
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#preview img {
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position:absolute;
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bottom:0;
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max-width:128px;
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}
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</style>
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</head>
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<body >
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<a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>
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<a href="../../index.html">
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<h1>ol-ext: layer preview</h1>
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</a>
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<div class="info">
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Get a preview image for a layer.
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<br />
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It will add a <i>getPreview(lonlat, res)</i> function to layers to get an image preview of it.
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<ul>
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<li>
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The function return an array of previews (group layers will return a preview for each layers in it).</li>
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<li>
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You can add a preview image on layer that has no preview (vector layers for examples).
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</li>
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<li>
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See how it runs on <a href="../control/map.switcher.image.html">Layer switcher image example</a>.
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</li>
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</ul>
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</div>
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<!-- map div -->
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<div id="map" style="width:600px; height:400px;"></div>
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<div id="preview" class="options" style="padding:1em;">
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Preview: <select></select>
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<div class="img"></div>
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</div>
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<script type="text/javascript">
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// Two base layers
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var carto = new ol.layer.Geoportail({ layer: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2' });
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var osm = new ol.layer.Tile({
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title: "OSM",
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baseLayer: true,
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source: new ol.source.OSM(),
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visible: false
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});
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// WMS Layer BRGM
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var brgm = new ol.layer.Tile({
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name: "Geologie (WMS)",
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visible: false,
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minResolution: 200000 /(72/2.54*100),
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maxResolution: 10000000 /(72/2.54*100),
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source: new ol.source.TileWMS({
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url: 'https://geoservices.brgm.fr/geologie',
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attributions: [ '© BRGM (French USGS equivalent)' ],
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projection:"EPSG:3857",
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params: {
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'LAYERS': 'SCAN_F_GEOL1M', //'SCAN_D_GEOL50',
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'FORMAT': 'image/png',
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'VERSION': '1.1.1'
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}
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//crossOrigin: 'anonymous',
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})
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});
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// GeoJSON layer
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var vectorSource = new ol.source.Vector({
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url: '../data/fond_guerre.geojson',
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projection: 'EPSG:3857',
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format: new ol.format.GeoJSON(),
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attributions: [ "© <a href='https://data.culture.gouv.fr/explore/dataset/fonds-de-la-guerre-14-18-extrait-de-la-base-memoire'>data.culture.gouv.fr</a>" ],
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logo:"https://www.data.gouv.fr/s/avatars/37/e56718abd4465985ddde68b33be1ef.jpg"
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});
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var vector = new ol.layer.Vector({
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name: '1914-18 (vector)',
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// Set the preview for vector layer
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preview: "http://www.culture.gouv.fr/Wave/image/memoire/2484/sap40_z0002136_v.jpg",
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source: vectorSource
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});
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// The map
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var map = new ol.Map({
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target: 'map',
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//renderer: ["canvas", "webgl", "dom"], /* ["webgl", "canvas", "dom"] */
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view: new ol.View({
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zoom: 6,
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center: [270148, 6247782]
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}),
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layers: [osm,carto,brgm, vector]
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});
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// Add a new Layerswitcher to the map
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map.addControl(new ol.control.LayerSwitcher());
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// Fill select with maps layer
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var select = $("#preview select").on("change", function () { showPreview(layers[this.value]);} );
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var layers = map.getLayers().getArray();
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for (var i = 0; i<layers.length; i++) {
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$("<option>").val(i)
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.text(layers[i].get('title') || layers[i].get('name'))
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.appendTo(select);
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}
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// Display preview in the img div
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function showPreview (l) {
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$("#preview .img").html("");
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var pv = l.getPreview(map.getView().getCenter());
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for (var i=0; i<pv.length; i++) $("<img>").attr('src',pv[i]).appendTo("#preview .img");
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}
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showPreview(layers[0]);
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</script>
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</body>
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</html> |