<!DOCTYPE html> <html> <head> <title>JSTS Integration</title> <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/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/v4.0.1/build/ol.js"></script> <script src="https://cdn.rawgit.com/bjornharrtell/jsts/gh-pages/1.2.0/jsts.min.js"></script> </head> <body> <div id="map" class="map"></div> <script> // this example uses JSTS for which we don't have an externs file. var source = new ol.source.Vector(); fetch('https://openlayers.org/en/v4.0.1/examples/data/geojson/roads-seoul.geojson').then(function(response) { return response.json(); }).then(function(json) { var format = new ol.format.GeoJSON(); var features = format.readFeatures(json, {featureProjection: 'EPSG:3857'}); var parser = new jsts.io.OL3Parser(); for (var i = 0; i < features.length; i++) { var feature = features[i]; // convert the OpenLayers geometry to a JSTS geometry var jstsGeom = parser.read(feature.getGeometry()); // create a buffer of 40 meters around each line var buffered = jstsGeom.buffer(40); // convert back from JSTS and replace the geometry on the feature feature.setGeometry(parser.write(buffered)); } source.addFeatures(features); }); var vectorLayer = new ol.layer.Vector({ source: source }); var rasterLayer = new ol.layer.Tile({ source: new ol.source.OSM() }); var map = new ol.Map({ layers: [rasterLayer, vectorLayer], target: document.getElementById('map'), view: new ol.View({ center: ol.proj.fromLonLat([126.979293, 37.528787]), zoom: 15 }) }); </script> </body> </html>
OpenLayers示例代码:JSTS集成
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