原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/overviewmap-custom.html

运行界面

这个例子演示了如何使用所支持的选项来定制鹰眼控件，以及如何定义CSS样式。你可以可以按住Shift键旋转地图，并查看鹰眼的状态。

main.js代码如下：

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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 {
  DragRotateAndZoom,
  defaults as defaultInteractions,
} from 'ol/interaction.js';
import {OverviewMap, defaults as defaultControls} from 'ol/control.js';

const rotateWithView = document.getElementById('rotateWithView');

const overviewMapControl = new OverviewMap({
  // see in overviewmap-custom.html to see the custom CSS used
  // 这里给出了自定义class名称，自定义样式请查看下面的html文件
  className: 'ol-overviewmap ol-custom-overviewmap',
  layers: [
    new TileLayer({
      source: new OSM({
        'url':
          'https://{a-c}.tile.thunderforest.com/cycle/{z}/{x}/{y}.png' +
          '?apikey=Your API key from https://www.thunderforest.com/docs/apikeys/ here',
      }),
    }),
  ],
  collapseLabel: '\u00BB',
  label: '\u00AB',
  collapsed: false,
});

rotateWithView.addEventListener('change', function () {
  overviewMapControl.setRotateWithView(this.checked);
});

const map = new Map({
  controls: defaultControls().extend([overviewMapControl]),
  interactions: defaultInteractions().extend([new DragRotateAndZoom()]),
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
  ],
  target: 'map',
  view: new View({
    center: [500000, 6000000],
    zoom: 7,
  }),
});

界面布局文件index.html代码如下：

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Custom Overview Map</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }

      .map .ol-custom-overviewmap,
      .map .ol-custom-overviewmap.ol-uncollapsible {
        bottom: auto;
        left: auto;
        right: 0;
        top: 0;
      }

      .map .ol-custom-overviewmap:not(.ol-collapsed)  {
        border: 1px solid black;
      }

      .map .ol-custom-overviewmap .ol-overviewmap-map {
        border: none;
        width: 300px;
      }

      .map .ol-custom-overviewmap .ol-overviewmap-box {
        border: 2px solid red;
      }

      .map .ol-custom-overviewmap:not(.ol-collapsed) button{
        bottom: auto;
        left: auto;
        right: 1px;
        top: 1px;
      }

      .map .ol-rotate {
        top: 170px;
        right: 0;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div><label><input type="checkbox" id="rotateWithView"> Rotate with view</label></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>