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Constrained Extent

发布于 2022-11-30 23:36:02 字数 2485 浏览 0 评论 0 收藏 0

Example of a view with a constrained extent.

本示例演示将地图显示视野限制在一定范围。本示例使用 view 对象的 extent 参数来完成设置。请注意：如果设置 constrainOnlyCenter: true，那么只会将范围限制应用到地图视野中心。

main.js

import 'ol/ol.css';
import Map from 'ol/Map';
import OSM from 'ol/source/OSM';
import TileLayer from 'ol/layer/Tile';
import View from 'ol/View';
import ZoomSlider from 'ol/control/ZoomSlider';
import {defaults as defaultControls} from 'ol/control';

const view = new View({
  center: [328627.563458, 5921296.662223],
  zoom: 8,
  extent: [-572513.341856, 5211017.966314, 916327.095083, 6636950.728974],
});

new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
  ],
  keyboardEventTarget: document,
  target: 'map',
  view: view,
  controls: defaultControls().extend([new ZoomSlider()]),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Constrained Extent</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep"></script>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="./resources/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder,Number.isInteger"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "extent-constrained",
  "dependencies": {
    "ol": "7.1.0"
  },
  "devDependencies": {
    "parcel": "^2.0.0-beta.1"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}

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