Icon 颜色

本示例演示 icon 图标设置自定义颜色

本示例演示 icon 图标设置自定义颜色。本示例中的 icon 图标使用白色填充的图片来展示。对于一些图形要素，使用 color 属性来自定义设置颜色。注意：icon 文件需要遵守相同的策略或者发送匹配的 CORS 头部来确保它生效。当依赖 CORS 头部是，ol/style/Icon 必须设置 crossOrigin: 'anonymous' 属性参数。

main.js

import Feature from 'ol/Feature.js';
import Map from 'ol/Map.js';
import Point from 'ol/geom/Point.js';
import TileJSON from 'ol/source/TileJSON.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import {Icon, Style} from 'ol/style.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {fromLonLat} from 'ol/proj.js';

const rome = new Feature({
  geometry: new Point(fromLonLat([12.5, 41.9])),
});

const london = new Feature({
  geometry: new Point(fromLonLat([-0.12755, 51.507222])),
});

const madrid = new Feature({
  geometry: new Point(fromLonLat([-3.683333, 40.4])),
});
const paris = new Feature({
  geometry: new Point(fromLonLat([2.353, 48.8566])),
});
const berlin = new Feature({
  geometry: new Point(fromLonLat([13.3884, 52.5169])),
});

rome.setStyle(
  new Style({
    image: new Icon({
      color: '#BADA55',
      crossOrigin: 'anonymous',
      src: 'data/square.svg',
    }),
  })
);

london.setStyle(
  new Style({
    image: new Icon({
      color: 'rgba(255, 0, 0, .5)',
      crossOrigin: 'anonymous',
      src: 'data/bigdot.png',
      scale: 0.2,
    }),
  })
);

madrid.setStyle(
  new Style({
    image: new Icon({
      crossOrigin: 'anonymous',
      src: 'data/bigdot.png',
      scale: 0.2,
    }),
  })
);

paris.setStyle(
  new Style({
    image: new Icon({
      color: '#8959A8',
      crossOrigin: 'anonymous',
      src: 'data/dot.svg',
    }),
  })
);

berlin.setStyle(
  new Style({
    image: new Icon({
      crossOrigin: 'anonymous',
      src: 'data/dot.svg',
    }),
  })
);
const vectorSource = new VectorSource({
  features: [rome, london, madrid, paris, berlin],
});

const vectorLayer = new VectorLayer({
  source: vectorSource,
});

const rasterLayer = new TileLayer({
  source: new TileJSON({
    url: 'https://a.tiles.mapbox.com/v3/aj.1x1-degrees.json?secure=1',
    crossOrigin: '',
  }),
});

const map = new Map({
  layers: [rasterLayer, vectorLayer],
  target: document.getElementById('map'),
  view: new View({
    center: fromLonLat([2.896372, 44.6024]),
    zoom: 3,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Icon Colors</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="./resources/elm-pep.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "icon-color",
  "dependencies": {
    "ol": "7.3.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}