展平 3D 网格

您可以使地图的特定区域变平，以移除 3D 建筑物、结构和植物。网格展平处理虽然会保留地形（山丘和山谷）的底层几何图形，但会移除树木、建筑物和人造物体的杂乱感。这样一来，您就可以在干净的空间中放置自定义 3D 模型、标记或数据层，而不会受到现有地图要素的视觉干扰。

以下示例展示了经过平整处理的选定区域的地图：

TypeScript

async function initMap(): Promise<void> {
    await google.maps.importLibrary('maps3d');

    const map = document.querySelector('gmp-map-3d') as Element;
    const flattener = document.querySelector('gmp-flattener') as Element;
    map.append(flattener);

    const toggleButton = document.getElementById('toggleButton') as HTMLButtonElement;
    toggleButton.addEventListener('click', () => {
        if (flattener.isConnected) {
            flattener.remove();
            toggleButton.textContent = 'Enable Flattener';
        } else {
            map.append(flattener);
            toggleButton.textContent = 'Disable Flattener';
        }
    });

}

initMap();index.ts

JavaScript

async function initMap() {
    await google.maps.importLibrary('maps3d');
    const map = document.querySelector('gmp-map-3d');
    const flattener = document.querySelector('gmp-flattener');
    map.append(flattener);
    const toggleButton = document.getElementById('toggleButton');
    toggleButton.addEventListener('click', () => {
        if (flattener.isConnected) {
            flattener.remove();
            toggleButton.textContent = 'Enable Flattener';
        }
        else {
            map.append(flattener);
            toggleButton.textContent = 'Disable Flattener';
        }
    });
}
initMap();index.js

CSS

html,
gmp-map-3d {
  height: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

.toggleButton {
  background: rgb(235, 235, 235);
  color: black;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
}

.toggleButton:hover {
  background-color: #007bff;
  color: white;
}style.css

HTML

<html>
    <head>
        <title>3D Mesh Flatten</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
    </head>
    <body>
        <gmp-map-3d
            center="40.70304023274898,-73.99453903360259,397.3687221767566"
            heading="-54.63577922139952"
            tilt="65.59195953953744"
            mode="SATELLITE">
            <gmp-flattener path="40.707680607935245,-74.00310353377735,500 40.70829665151717,-74.00193595590612,500 40.7073748659931,-74.00122787224885,500 40.706738652153156,-74.00232125268805,500 40.70738164589913,-74.0028721484274,500"></gmp-flattener>
        </gmp-map-3d>

        <button class="toggleButton" id="toggleButton" type="button">Disable Flattener</button>

        <script>
            (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
            key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8",
            v: "beta",
            // Use the 'v' parameter to indicate the version to use (weekly, beta, alpha, etc.).
            // Add other bootstrap parameters as needed, using camel case.
            });
        </script>
    </body>
</html>index.html

试用示例

JSFiddle.net

展平区域

以下示例展示了如何将纬度/经度坐标的路径传递给扁平化器：

<gmp-map-3d center="40.707, -74.017, 0" tilt="67.5">
  <gmp-flattener path="40.7144,-74.0208 40.6993,-74.019 40.7035,-74.0004"></gmp-flattener>
</gmp-map-3d>

取消扁平化特定区域

以下示例演示了如何从展平器中移除多边形的某个区域（使用 flattener.innerPaths）：

<gmp-map-3d center="40.707, -74.007, 0" tilt="67.5">
  <gmp-flattener id="my-flattener" path="40.7144,-74.0208 40.6993,-74.019 40.7035,-74.0004"></gmp-flattener>
</gmp-map-3d>

<script>
  const flattener = document.getElementById('my-flattener');
  flattener.innerPaths = [
    [
      { lat: 40.71, lng: -74.0175 },
      { lat: 40.703, lng: -74.0165 },
      { lat: 40.7035, lng: -74.006 }
    ],
  ];
</script>

主要优势

自定义：移除默认地图几何图形，为自己的 3D 模型腾出空间。
清晰度：在地图表面上直接提供多边形和多段线（例如详细路线）的清晰、无遮挡视图。
摄像头视野：防止建筑物或树木干扰摄像头画面，遮挡焦点。