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Mapbox-gl 图层

发布于 2022-11-30 23:36:04 字数 5123 浏览 0 评论 0 收藏 0

本示例演示 Mapbox-gl-js 图层集成。

本示例演示 OpenLayers 地图上添加 mapbox-gl-js 图层。注意: 在使用本示例的时候，确保在 https://www.maptiler.com/cloud/ 申请使用你自己的 API key。如果 API key 过期了，地图将不会显示。本示例中 mapbox-gl-js 版本为 1.13.0，因为之后的版本需要 Mapbox 的访问令牌，并且不兼容旧的浏览器。

main.js

import 'ol/ol.css';
import GeoJSON from 'ol/format/GeoJSON';
import Layer from 'ol/layer/Layer';
import Map from 'ol/Map';
import Source from 'ol/source/Source';
import VectorLayer from 'ol/layer/Vector';
import VectorSource from 'ol/source/Vector';
import View from 'ol/View';
import {Stroke, Style} from 'ol/style';
import {fromLonLat, toLonLat} from 'ol/proj';

const center = [-98.8, 37.9];
const key = 'Get your own API key at https://www.maptiler.com/cloud/';

const mbMap = new mapboxgl.Map({
  style: 'https://api.maptiler.com/maps/bright/style.json?key=' + key,
  attributionControl: false,
  boxZoom: false,
  center: center,
  container: 'map',
  doubleClickZoom: false,
  dragPan: false,
  dragRotate: false,
  interactive: false,
  keyboard: false,
  pitchWithRotate: false,
  scrollZoom: false,
  touchZoomRotate: false,
});

const mbLayer = new Layer({
  render: function (frameState) {
    const canvas = mbMap.getCanvas();
    const viewState = frameState.viewState;

    const visible = mbLayer.getVisible();
    canvas.style.display = visible ? 'block' : 'none';

    const opacity = mbLayer.getOpacity();
    canvas.style.opacity = opacity;

    // adjust view parameters in mapbox
    const rotation = viewState.rotation;
    mbMap.jumpTo({
      center: toLonLat(viewState.center),
      zoom: viewState.zoom - 1,
      bearing: (-rotation * 180) / Math.PI,
      animate: false,
    });

    // cancel the scheduled update & trigger synchronous redraw
    // see https://github.com/mapbox/mapbox-gl-js/issues/7893#issue-408992184
    // NOTE: THIS MIGHT BREAK IF UPDATING THE MAPBOX VERSION
    if (mbMap._frame) {
      mbMap._frame.cancel();
      mbMap._frame = null;
    }
    mbMap._render();

    return canvas;
  },
  source: new Source({
    attributions: [
      '<a href="https://www.maptiler.com/copyright/" target="_blank">© MapTiler</a>',
      '<a href="https://www.openstreetmap.org/copyright" target="_blank">© OpenStreetMap contributors</a>',
    ],
  }),
});

const style = new Style({
  stroke: new Stroke({
    color: '#319FD3',
    width: 2,
  }),
});

const vectorLayer = new VectorLayer({
  source: new VectorSource({
    url: 'data/geojson/countries.geojson',
    format: new GeoJSON(),
  }),
  style: style,
});

const map = new Map({
  target: 'map',
  view: new View({
    center: fromLonLat(center),
    zoom: 4,
  }),
  layers: [mbLayer, vectorLayer],
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Mapbox-gl Layer</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>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/mapbox-gl/1.13.0/mapbox-gl.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mapbox-gl/1.13.0/mapbox-gl.css">
    <style>
      .map {
        width: 100%;
        height:400px;
      }
      /* Reset font size changed by Mapbox CSS */
      .map {
        font-size: medium;
        font-family: 'Quattrocento Sans', sans-serif;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "mapbox-layer",
  "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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