CoplanarPolygonGeometry - CesiumJS API 文档

new Cesium.CoplanarPolygonGeometry(options)

描述一个由任意的同位素位置组成的多边形.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`polygonHierarchy`	PolygonHierarchy		多边形结构可以包括孔.
`stRotation`	number	`0.0`	optional 纹理坐标的旋转,以弧度表示. 正旋转是逆时针.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid to be used as a reference.
`textureCoordinates`	PolygonHierarchy		optional Texture coordinates as a `PolygonHierarchy` of `Cartesian2` points.

Example:

const polygonGeometry = new Cesium.CoplanarPolygonGeometry({
 polygonHierarchy: new Cesium.PolygonHierarchy(
    Cesium.Cartesian3.fromDegreesArrayHeights([
     -90.0, 30.0, 0.0,
     -90.0, 30.0, 300000.0,
     -80.0, 30.0, 300000.0,
     -80.0, 30.0, 0.0
  ]))
});

Members

packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.CoplanarPolygonGeometry.createGeometry(polygonGeometry) → Geometry|undefined

计算任意的coplanar多边形的几何表示,包括其顶点,指数,以及边框.

Name	Type	Description
`polygonGeometry`	CoplanarPolygonGeometry	多边形描述.

Returns:

计算出的顶点和指数.

static Cesium.CoplanarPolygonGeometry.fromPositions(options) → CoplanarPolygonGeometry

描述一组位置上的同形多边形.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`positions`	Array.<Cartesian3>		定义多边形角点的一系列位置.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.
`stRotation`	number	`0.0`	optional 纹理坐标的旋转,以弧度表示. 正旋转是逆时针.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid to be used as a reference.
`textureCoordinates`	PolygonHierarchy		optional Texture coordinates as a `PolygonHierarchy` of `Cartesian2` points.

Returns:

Example:

// create a polygon from points
const polygon = Cesium.CoplanarPolygonGeometry.fromPositions({
  positions : Cesium.Cartesian3.fromDegreesArray([
    -72.0, 40.0,
    -70.0, 35.0,
    -75.0, 30.0,
    -70.0, 30.0,
    -68.0, 40.0
  ])
});
const geometry = Cesium.PolygonGeometry.createGeometry(polygon);

See:

PolygonGeometry#createGeometry

static Cesium.CoplanarPolygonGeometry.pack(value, array, startingIndex) → Array.<number>

将所提供的实例存储到所提供的数组中.

Name	Type	Default	Description
`value`	CoplanarPolygonGeometry		包装的价值.
`array`	Array.<number>		装入的阵列.
`startingIndex`	number	`0`	optional The index into the array at which to start packing the elements.

Returns:

装入的阵列

static Cesium.CoplanarPolygonGeometry.unpack(array, startingIndex, result) → CoplanarPolygonGeometry

从组合的数组中获取实例 .

Name	Type	Default	Description
`array`	Array.<number>		装填的阵列.
`startingIndex`	number	`0`	optional The starting index of the element to be unpacked.
`result`	CoplanarPolygonGeometry		optional 存储结果的对象.

Returns:

如果不提供经修改的结果参数或新的CoplanarPolygonGeometry实例.