Cesium JS API
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PolygonOutlineGeometry

PolygonOutlineGeometry 是表示多边形线框的几何图形,可以用来创建多边形的线框。

用法

要创建一个 PolygonOutlineGeometry,需要指定多边形的顶点数组及其它参数:

var polygon = new Cesium.PolygonOutlineGeometry({
  polygonHierarchy : new Cesium.PolygonHierarchy(
    // 多边形的顶点数组
    Cesium.Cartesian3.fromDegreesArray([
      -72.0, 40.0,
      -70.0, 35.0,
      -75.0, 30.0,
      -80.0, 40.0
    ])
  ),

  // 可选参数
  height: 0,
  extrudedHeight: 100000.0,
  vertexFormat: Cesium.VertexFormat.DEFAULT,
  ellipsoid: Cesium.Ellipsoid.WGS84,
  granularity: Cesium.Math.RADIANS_PER_DEGREE,
  perPositionHeight: false
});

以上代码将创建一个具有四个顶点的多边形线框。

参数

名称 类型 默认值 描述
polygonHierarchy PolygonHierarchy undefined 多边形的顶点数组。
height Number 0 多边形的高度,相对于地球椭球体(ellipsoid)。
extrudedHeight Number undefined 多边形的高度,相对于地球椭球体(ellipsoid)。
vertexFormat VertexFormat VertexFormat.DEFAULT 多边形的顶点格式。
ellipsoid Ellipsoid Ellipsoid.WGS84 要使用的椭球体。
granularity Number Cesium.Math.RADIANS_PER_DEGREE 多边形的细节级别。
perPositionHeight Boolean false 如果为 true,则多边形将使用每个顶点的高度;否则,将使用 height 参数定义的高度。

示例

以下示例将在小区域内创建了一个四边形多边形线框,指定了其相对高度为 500000.0 米。其中,viewer 是 Cesium 的 Viewer 实例。

var rectangle = Cesium.Rectangle.fromDegrees(-87.0, 30.0, -75.0, 40.0);
var coordinateArr = [];
var NW = Cesium.Rectangle.northwest(rectangle);
var SE = Cesium.Rectangle.southeast(rectangle);
coordinateArr.push(NW.longitude, NW.latitude);
coordinateArr.push(SE.longitude, NW.latitude);
coordinateArr.push(SE.longitude, SE.latitude);
coordinateArr.push(NW.longitude, SE.latitude);

// 创建多边形线框
var polygon = new Cesium.PolygonOutlineGeometry({
  polygonHierarchy: new Cesium.PolygonHierarchy(
    Cesium.Cartesian3.fromDegreesArray(coordinateArr)
  ),
  extrudedHeight: 500000.0
});
// 创建多边形实例
viewer.entities.add({
  name: 'Polygon outline',
  polygon: polygon,
  outline: true,
  outlineColor: Cesium.Color.RED,
  outlineWidth: 3,
  material: Cesium.Color.WHITE
});

通过以上示例,将在你的 Cesium 地图中看到具有红色描边的白色四边形多边形线框。

参见