原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/xyz-retina.html

关于Retina显示屏请参考维基百科：https://zh.wikipedia.org/wiki/Retina%E6%98%BE%E7%A4%BA%E5%B1%8F 。

运行界面

配置了tilePixelRatio选项的XYZ数据源。

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
import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import XYZ from 'ol/source/XYZ.js';
import {transform} from 'ol/proj.js';

const key = 'Get your own API key at https://www.maptiler.com/cloud/';
const attributions =
  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
  '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';

const map = new Map({
  target: 'map',
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
    new TileLayer({
      source: new XYZ({
        attributions: attributions,
        url:
          'https://api.maptiler.com/maps/outdoor/256/{z}/{x}/{y}@2x.png?key=' +
          key,
        tilePixelRatio: 2, // THIS IS IMPORTANT
      }),
    }),
  ],
  view: new View({
    projection: 'EPSG:3857',
    center: transform([-112.18688965, 36.057944835], 'EPSG:4326', 'EPSG:3857'),
    zoom: 12,
  }),
});

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>XYZ Retina Tiles</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>