原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/wkt.html

运行界面

从WKT（Well Known Text）格式的几何图形数据中创建要素。

main.js代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import WKT from 'ol/format/WKT.js';
import {OSM, Vector as VectorSource} from 'ol/source.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';

const raster = new TileLayer({
  source: new OSM(),
});

const wkt =
  'POLYGON((10.689 -25.092, 34.595 ' +
  '-20.170, 38.814 -35.639, 13.502 ' +
  '-39.155, 10.689 -25.092))';

const format = new WKT();

const feature = format.readFeature(wkt, {
  dataProjection: 'EPSG:4326',
  featureProjection: 'EPSG:3857',
});

const vector = new VectorLayer({
  source: new VectorSource({
    features: [feature],
  }),
});

const map = new Map({
  layers: [raster, vector],
  target: 'map',
  view: new View({
    center: [2952104.0199, -3277504.823],
    zoom: 4,
  }),
});

界面布局文件index.html代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>WKT</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>