OpenSource
/
dc-sdk
mirror of https://github.com/dvt3d/dc-sdk


			
				
					
						
						
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							<!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>
<script>
  let viewer = undefined

  function generatePosition(num,isAdd) {
    let list = []
    for (let i = 0; i < num; i++) {
      let lng = 121.49536592256028 + Math.random() * 0.04 * (isAdd ? 1 :-1)
      let lat = 31.241616722278213 + Math.random() * 0.04 * (isAdd ? 1 :-1)
      list.push({lng,lat})
    }
    return list
  }

  function initViewer() {
    viewer = new DC.Viewer('viewer-container')
    viewer.setOptions({
      globe:{
        baseColor:DC.Color.BLACK
      }
    })
    let layer_build = new DC.TilesetLayer('layer_build').addTo(viewer)
    let build = new DC.Tileset(
      '//resource.dvgis.cn/data/3dtiles/ljz/tileset.json',
      {skipLevels:true}
    )
    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)) ;
       }
      `
    })
    build.setCustomShader(customShader)
    layer_build.addOverlay(build)
    let layer = new DC.PrimitiveLayer('layer').addTo(viewer)
    let positions = generatePosition(50,true)
    positions = positions.concat(generatePosition(50,))
    positions.forEach(item=>{
      let position = DC.Position.fromObject(item)
      let end = position.copy()
      end.alt = 5000 * Math.random()
      let line = new DC.FlowLinePrimitive([position,end],0.5)
      line.setStyle({
        speed: 6 * Math.random(),
        color: DC.Color.fromCssColorString("rgb(141,172,172)"),
        percent:0.1,
        gradient:0.01
      })
      layer.addOverlay(line)
    })
    viewer.flyToPosition("121.4941629,31.2091462,1859.56,0,-28.71")
  }
    DC.ready({
    baseUrl:'../libs/dc-sdk/resources/'
  }).then(initViewer)
</script>
</body>
</html>