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Static Image

发布于 2022-11-30 23:36:06 字数 3015 浏览 0 评论 0 收藏 0

Example of a static image layer.

This example uses a static image as a layer source. The map view is configured with a custom projection that translates image coordinates directly into map coordinates.

main.js

import 'ol/ol.css';
import ImageLayer from 'ol/layer/Image';
import Map from 'ol/Map';
import Projection from 'ol/proj/Projection';
import Static from 'ol/source/ImageStatic';
import View from 'ol/View';
import {getCenter} from 'ol/extent';

// Map views always need a projection.  Here we just want to map image
// coordinates directly to map coordinates, so we create a projection that uses
// the image extent in pixels.
const extent = [0, 0, 1024, 968];
const projection = new Projection({
  code: 'xkcd-image',
  units: 'pixels',
  extent: extent,
});

const map = new Map({
  layers: [
    new ImageLayer({
      source: new Static({
        attributions: '© <a href="https://xkcd.com/license.html">xkcd</a>',
        url: 'http://www.wenjiangs.com/wp-content/uploads/2022/docimg28/online_communities.png',
        projection: projection,
        imageExtent: extent,
      }),
    }),
  ],
  target: 'map',
  view: new View({
    projection: projection,
    center: getCenter(extent),
    zoom: 2,
    maxZoom: 8,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Static Image</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": "static-image",
  "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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