小歐ou | 菜鳥自救會

努力工作，用心學習

2020-10-14

HERE API Example - 在執行期間變更地圖樣式

本文說明如何在執行期間變更地圖樣式。

主要步驟為取得 BaseLayer，修訂樣式並且合併回 BaseLayer。

JavaScript

function changeFeatureStyle(map){
  // 取得基礎圖層 BaseLayer
  var provider = map.getBaseLayer().getProvider();

  // 從 BaseLayer 取得樣式
  var parkStyle = provider.getStyle();

  var changeListener = (evt) => {
    if (parkStyle.getState() === H.map.Style.State.READY) {
      parkStyle.removeEventListener('change', changeListener);

      // 查詢與配置地圖樣式
      var parkConfig = parkStyle.extractConfig(['landuse.park', 'landuse.builtup']);
      // 變更顏色
      parkConfig.layers.landuse.park.draw.polygons.color = '#2ba815'
      parkConfig.layers.landuse.builtup.draw.polygons.color = '#676d67'

      // 將配置合併回 BaseLayer
      parkStyle.mergeConfig(parkConfig);
    }
  };

  parkStyle.addEventListener('change', changeListener);
}

/**
 * map 初始化相關代碼:
 */

// Step 1: 初始化 platform
var platform = new H.service.Platform({
  apikey: window.apikey
});
var defaultLayers = platform.createDefaultLayers();

//Step 2: 初始化 map
var map = new H.Map(document.getElementById('map'),
  defaultLayers.vector.normal.map, {
  center: {lat:25.03746, lng:121.564558},
  zoom: 13,
  pixelRatio: window.devicePixelRatio || 1
});
// 加入 resize listener
window.addEventListener('resize', () => map.getViewPort().resize());

//Step 3: 建立地圖互動性
var behavior = new H.mapevents.Behavior(new H.mapevents.MapEvents(map));

// 建立預設 UI 元件
var ui = H.ui.UI.createDefault(map, defaultLayers);

changeFeatureStyle(map);

HTML

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=yes">
    <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
    <title>在執行期間變更地圖樣式</title>
    <link rel="stylesheet" type="text/css" href="https://js.api.here.com/v3/3.1/mapsjs-ui.css" />
    <link rel="stylesheet" type="text/css" href="demo.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <link rel="stylesheet" type="text/css" href="../template.css" />
    <script type="text/javascript" src='../test-credentials.js'></script>    
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-core.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-service.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-ui.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-mapevents.js"></script>
  </head>
  <body id="markers-on-the-map">    
    <div id="map"></div>   
    <script type="text/javascript" src='demo.js'></script>
  </body>
</html>

CSS


#map {
    width: 95%;
    height: 450px;
    background: grey;
}

#panel {
    width: 100%;
    height: 400px;
}

執行結果

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