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Points, points & points - version ol.source.Vector
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8> | |
| <meta name=description content=""> | |
| <meta name=viewport content="width=device-width, initial-scale=1"> | |
| <title>Points, points & points - version ol.source.Vector</title> | |
| <link rel="stylesheet" href="https://openlayers.org/en/v4.4.2/css/ol.css" type="text/css"> | |
| <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --> | |
| <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script> | |
| <script src="https://openlayers.org/en/v4.4.2/build/ol.js"></script> | |
| <script src='https://npmcdn.com/@turf/turf/turf.min.js'></script> | |
| <style type="text/css"> | |
| html, body { | |
| margin: 0; | |
| height: 100%; | |
| } | |
| #map { | |
| position: absolute; | |
| top: 0; | |
| bottom: 0; | |
| width: 100%; | |
| } | |
| #text { | |
| position: absolute; | |
| z-index: 1; | |
| bottom: 1em; | |
| left: 1em; | |
| padding: 15px; | |
| background-color: white; | |
| border: #0e0e0e 1px solid; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map" class="map"> | |
| <div id="text"> | |
| <h1 id="title">How Many Points...</h1> | |
| <div id="docs"> | |
| <p> | |
| Number of points to place on the map: | |
| <input id="num" value="1000" type="number"> | |
| <button id="draw">Draw</button> | |
| <button id="clear">Clear</button> | |
| </p> | |
| <p> | |
| This page is an <b>OpenLayers 4</b> updated version of this <a href="https://derekswingley.com/lab/olpts/">OpenLayers 2 Derek Swingley demo</a> | |
| <br> | |
| It uses <a href="http://openlayers.org/en/latest/apidoc/ol.source.Vector.html">"ol.source.Vector"</a> | |
| </p> | |
| </div> | |
| </div> | |
| </div> | |
| <script> | |
| var vector = new ol.layer.Vector({ | |
| source: new ol.source.Vector({ | |
| format: new ol.format.GeoJSON() | |
| }), | |
| style: new ol.style.Style({ | |
| image: new ol.style.Circle({ | |
| radius: 6, | |
| fill: new ol.style.Fill({ | |
| color: '#3399CC' | |
| }), | |
| stroke: new ol.style.Stroke({ | |
| color: '#fff', | |
| width: 2 | |
| }) | |
| }) | |
| }) | |
| }); | |
| var raster = new ol.layer.Tile({ | |
| source: new ol.source.OSM() | |
| }) | |
| var map = new ol.Map({ | |
| renderer: /** @type {Array<ol.renderer.Type>} */ (['webgl', 'canvas']), | |
| layers: [ | |
| raster, | |
| vector | |
| ], | |
| target: 'map', | |
| view: new ol.View({ | |
| center: [0, 0], | |
| zoom: 2 | |
| }) | |
| }); | |
| function addRandomFeaturesInExtent(num) { | |
| var extent = map.getView().calculateExtent(); | |
| var extent4326 = ol.proj.transformExtent(extent, 'EPSG:3857', 'EPSG:4326'); | |
| var points = turf.randomPoint(num, { | |
| bbox: extent4326 | |
| }); | |
| vector.getSource().addFeatures(vector.getSource().getFormat().readFeatures(points, { | |
| featureProjection: 'EPSG:3857' | |
| })); | |
| }; | |
| addRandomFeaturesInExtent(Number(document.getElementById('num').value)); | |
| document.getElementById('draw').addEventListener('click', function(e) { | |
| addRandomFeaturesInExtent(Number(document.getElementById('num').value)); | |
| }); | |
| document.getElementById('clear').addEventListener('click', function(e) { | |
| vector.getSource().clear(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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