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Street Labels

发布于 2022-11-30 23:36:06 字数 3628 浏览 0 评论 0 收藏 0

Render street names.

Example showing the use of a text style with placement: 'line' to render text along a path.

main.js

import 'ol/ol.css';
import GeoJSON from 'ol/format/GeoJSON';
import Map from 'ol/Map';
import VectorSource from 'ol/source/Vector';
import View from 'ol/View';
import XYZ from 'ol/source/XYZ';
import {Fill, Style, Text} from 'ol/style';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
import {getCenter} from 'ol/extent';

const style = new Style({
  text: new Text({
    font: 'bold 11px "Open Sans", "Arial Unicode MS", "sans-serif"',
    placement: 'line',
    fill: new Fill({
      color: 'white',
    }),
  }),
});

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 viewExtent = [1817379, 6139595, 1827851, 6143616];
const map = new Map({
  layers: [
    new TileLayer({
      source: new XYZ({
        attributions: attributions,
        url:
          'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
        maxZoom: 20,
      }),
    }),
    new VectorLayer({
      declutter: true,
      source: new VectorSource({
        format: new GeoJSON(),
        url: 'data/geojson/vienna-streets.geojson',
      }),
      style: function (feature) {
        style.getText().setText(feature.get('name'));
        return style;
      },
    }),
  ],
  target: 'map',
  view: new View({
    extent: viewExtent,
    center: getCenter(viewExtent),
    zoom: 17,
    minZoom: 14,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Street Labels</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": "street-labels",
  "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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