載入wkt就如此簡單 -來自openlayers
阿新 • • 發佈:2018-12-29
一個簡單的載入wkt到地圖的示例,程式碼來自openlayers官網。
<!DOCTYPE html> <html> <head> <title>WKT</title> <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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> </head> <body> <div id="map" class="map"></div> <script> import Map from 'ol/Map.js'; import View from 'ol/View.js'; import WKT from 'ol/format/WKT.js'; import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js'; import {OSM, Vector as VectorSource} from 'ol/source.js'; var raster = new TileLayer({ source: new OSM() }); var wkt = 'POLYGON((10.689 -25.092, 34.595 ' + '-20.170, 38.814 -35.639, 13.502 ' + '-39.155, 10.689 -25.092))'; var format = new WKT(); var feature = format.readFeature(wkt, { dataProjection: 'EPSG:4326', featureProjection: 'EPSG:3857' }); var vector = new VectorLayer({ source: new VectorSource({ features: [feature] }) }); var map = new Map({ layers: [raster, vector], target: 'map', view: new View({ center: [2952104.0199, -3277504.823], zoom: 4 }) }); </script> </body> </html>