deck.gl渲染TextLayer文本图层

效果图

deck.gl渲染TextLayer文本图层
deck.gl渲染TextLayer文本图层

在线地址

deck.gl渲染TextLayer文本图层
https://tool.giserdqy.com/deckgl/text-layer.html

功能说明

本实例实现了deck.gl加载底图,基于TextLayer渲染海量文本数据。动态调整文本字体大小、透明度。

数据结构

name: 文本名称
coordinates:文本放置的位置坐标

{"name":"Lafayette (LAFY)","code":"LF","address":"3601 Deer Hill Road, Lafayette CA 94549","entries":"3481","exits":"3616","coordinates":[-122.123801,37.893394]}

代码解析

  1. 此部分是引入在线deck.gl包,mapboxgl底图,设置了基本的css样式
<head>
    <title>deck.gl TextLayer Example</title>

    <script src="https://unpkg.com/deck.gl@^8.8.0/dist.min.js"></script>

    <script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.13.0/mapbox-gl.js"></script>

    <style type="text/css">
      body {
        width: 100vw;
        height: 100vh;
        margin: 0;
        overflow: hidden;
      }
      .deck-tooltip {
        font-family: Helvetica, Arial, sans-serif;
        padding: 6px !important;
        margin: 8px;
        max-width: 300px;
        font-size: 10px;
      }
      #control-panel {
        position: absolute;
        top: 0;
        left: 0;
        margin: 12px;
        padding: 10px;
        font-size: 11px;
        line-height: 1.5;
        z-index: 1;
        font-family: Helvetica, Arial, sans-serif;
        background: #fff;
        box-shadow: 0 0 4px rgba(0, 0, 0, 0.15);
      }
      label {
        display: inline-block;
        width: 50px;
      }
    </style>
  </head>
  1. 这部分初始化调整文本字体面板
<body>
      <div id="tooltip"></div>
      <div id="control-panel">
        <div>
          <label>Font Size</label>
          <input id="getSize" type="range" min="0" max="100" step="1" value="16"></input>
          <span id="getSize-value"></span>
        </div>
        <div>
          <label>Opacity</label>
          <input id="opacity" type="range" min="0" max="1" step="0.1" value="1"></input>
          <span id="opacity-value"></span>
        </div>
      </div>
  </body>
  1. 这部分是es6写法,引入需要的模块DeckGL、TextLayer,并初始化DeckGL(GeoJsonLayer已经有过解释可参照deck.gl渲染GeoJsonLayer
    https://www.giserdqy.com/secdev/deckgl/39849/
    <script type="text/javascript">
      const {DeckGL,TextLayer} = deck;

    const deckgl = new DeckGL({
      mapStyle: 'https://basemaps.cartocdn.com/gl/dark-matter-nolabels-gl-style/style.json',
      initialViewState: {
        longitude: -122.4,
        latitude: 37.74,
        zoom: 11,
        maxZoom: 15,
        pitch: 30,
        bearing: 0
      },
      controller: true,
      getTooltip: ({object}) => object && `${object.name}n${object.address}`
    });
  </script>
  1. 该部分初始化字体调整面板事件绑定,初始化TextLayer。详细配置见注释
const OPTIONS = ['getSize', 'opacity'];
    OPTIONS.forEach(key => {
      document.getElementById(key).oninput = renderLayer;
    });

    renderLayer();

    function renderLayer() {
      const options = {};
      OPTIONS.forEach(key => {
        const value = document.getElementById(key).value;
        document.getElementById(key + '-value').innerHTML = value;
        options[key] = Number(value);
      });

      const textLayer = new TextLayer({
        id: 'text-layer', // 图层唯一id
        data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/bart-stations.json', //绑定数据源
        pickable: true, // 可以鼠标捕捉
        getPosition: d => d.coordinates, // 动态设置文本位置
        getText: d => d.name, // 获取文本
        getSize: 16, // 文本大小
        getColor: [247,248,243], // 文本颜色
        getTextAnchor: 'middle', // 文本居中
        getAlignmentBaseline: 'center',// 文本垂直居中
        ...options // 字体面板的属性集合(透明度、字体大小)
      });
      
      deckgl.setProps({ layers: [textLayer] });
    }

源代码

拷贝到html文件中可直接用浏览器打开

<html>
  <head>
    <title>deck.gl TextLayer Example</title>

    <script src="https://unpkg.com/deck.gl@^8.8.0/dist.min.js"></script>

    <script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.13.0/mapbox-gl.js"></script>

    <style type="text/css">
      body {
        width: 100vw;
        height: 100vh;
        margin: 0;
        overflow: hidden;
      }
      .deck-tooltip {
        font-family: Helvetica, Arial, sans-serif;
        padding: 6px !important;
        margin: 8px;
        max-width: 300px;
        font-size: 10px;
      }
      #control-panel {
        position: absolute;
        top: 0;
        left: 0;
        margin: 12px;
        padding: 10px;
        font-size: 11px;
        line-height: 1.5;
        z-index: 1;
        font-family: Helvetica, Arial, sans-serif;
        background: #fff;
        box-shadow: 0 0 4px rgba(0, 0, 0, 0.15);
      }
      label {
        display: inline-block;
        width: 50px;
      }
    </style>
  </head>

  <body>
      <div id="tooltip"></div>
      <div id="control-panel">
        <div>
          <label>Font Size</label>
          <input id="getSize" type="range" min="0" max="100" step="1" value="16"></input>
          <span id="getSize-value"></span>
        </div>
        <div>
          <label>Opacity</label>
          <input id="opacity" type="range" min="0" max="1" step="0.1" value="1"></input>
          <span id="opacity-value"></span>
        </div>
      </div>
  </body>

  <script type="text/javascript">

    const {DeckGL,TextLayer} = deck;

    const deckgl = new DeckGL({
      mapStyle: 'https://basemaps.cartocdn.com/gl/dark-matter-nolabels-gl-style/style.json',
      initialViewState: {
        longitude: -122.4,
        latitude: 37.74,
        zoom: 11,
        maxZoom: 15,
        pitch: 30,
        bearing: 0
      },
      controller: true,
      getTooltip: ({object}) => object && `${object.name}n${object.address}`
    });
    
    const OPTIONS = ['getSize', 'opacity'];
    OPTIONS.forEach(key => {
      document.getElementById(key).oninput = renderLayer;
    });

    renderLayer();

    function renderLayer() {
      const options = {};
      OPTIONS.forEach(key => {
        const value = document.getElementById(key).value;
        document.getElementById(key + '-value').innerHTML = value;
        options[key] = Number(value);
      });

      const textLayer = new TextLayer({
        id: 'text-layer',
        data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/bart-stations.json',
        pickable: true,
        getPosition: d => d.coordinates,
        getText: d => d.name,
        getSize: 16,
        getColor: [247,248,243],
        getTextAnchor: 'middle',
        getAlignmentBaseline: 'center',
        ...options
      });
      
      deckgl.setProps({ layers: [textLayer] });
    }
    
  </script>
</html>

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