examples/animation/flying.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <title>dc-example</title>
  <script src='/libs/dc-sdk/dc.min.js'></script>
  <link href='/libs/dc-sdk/dc.min.css' type='text/css' rel='stylesheet'>
  <link href='../index.css' type='text/css' rel='stylesheet'>
</head>

<body>

<div id="viewer-container" class="viewer-container"></div>
<div class="btn-box">
  <ul>
    <li><input type="checkbox" name="check_loop" /> 是否循环 </li>
    <li><button onclick="start()">开始</button></li>
    <li><button onclick="pause()">暂停</button></li>
    <li><button onclick="restore()">继续</button></li>
  </ul>
</div>
<script>
  let viewer = undefined
  let flying = undefined

  function start(){
    let checked = document.getElementsByName('check_loop')[0].checked
    flying = new DC.Flying(viewer,{
      loop: checked,
      dwellTime:3,
    })
    flying.positions =  [
      {lng: 121.46748793889597, lat: 31.22345700031846, alt: 1082.6691622203975, heading: 0.9161118327237789, pitch: -38.63414039808751},
      {lng: 121.49543157056694, lat: 31.219611353179484, alt: 663.5376240776116, heading: 0.9161124649627334, pitch: -38.63418986635751},
      {lng: 121.53162234574106, lat: 31.228003869427294, alt: 1891.926162456467, heading: 298.6565902579582, pitch: -33.67285705092492},
      {lng: 121.54438164431083, lat: 31.25201585389836,  alt: 1441.4625182144541, heading: 298.65660919687264, pitch: -33.6728415156399}
    ]
    flying.start()
  }

  function pause(){
    flying.pause()
  }

  function restore(){
    flying.restore()
  }

  function initViewer() {
    viewer = new DC.Viewer('viewer-container')
    let  baseLayer = DC.ImageryLayerFactory.createAmapImageryLayer({
      style: 'img',
      crs:'WGS84'
    })
    viewer.addBaseLayer( baseLayer,{ brightness : 0.1})
    let layer = new DC.TilesetLayer('layer').addTo(viewer)
    let tileset = new DC.Tileset(
      '//resource.dvgis.cn/data/3dtiles/ljz/tileset.json'
    )
    let customShader =  new DC.CustomShader({
      fragmentShaderText:`
      void fragmentMain(FragmentInput fsInput, inout czm_modelMaterial material) {
         vec4 position = czm_inverseModelView * vec4(fsInput.attributes.positionEC,1); // 位置
         float glowRange = 100.0; // 光环的移动范围(高度)
         vec4 temp = vec4(0.2,  0.5, 1.0, 1.0); // 颜色
         temp *= vec4(vec3(position.z / 100.0), 1.0);  // 渐变
         // 动态光环
         float time = fract(czm_frameNumber / 360.0);
         time = abs(time - 0.5) * 2.0;
         float diff = step(0.005, abs( clamp(position.z / glowRange, 0.0, 1.0) - time));
         material.diffuse = vec3(temp.rgb + temp.rgb * (1.0 - diff)) ;
       }
      `
    })
    tileset.setCustomShader(customShader)
    layer.addOverlay(tileset)

    viewer.flyTo(tileset)
  }
  DC.ready({
    baseUrl:'../libs/dc-sdk/resources/'
  }).then(initViewer)
</script>
</body>
</html>