PolylineVolumeGeometry - CesiumJS API 文档

new Cesium.PolylineVolumeGeometry(options)

说明带有体积的多线(沿着多线挤压的2D形状).

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`polylinePositions`	Array.<Cartesian3>		An array of `Cartesian3` positions that define the center of the polyline volume.
`shapePositions`	Array.<Cartesian2>		An array of `Cartesian2` positions that define the shape to be extruded along the polyline
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid to be used as a reference.
`granularity`	number	`CesiumMath.RADIANS_PER_DEGREE`	optional The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.
`cornerType`	CornerType	`CornerType.ROUNDED`	optional Determines the style of the corners.

Example:

function computeCircle(radius) {
  const positions = [];
  for (let i = 0; i < 360; i++) {
    const radians = Cesium.Math.toRadians(i);
    positions.push(new Cesium.Cartesian2(radius * Math.cos(radians), radius * Math.sin(radians)));
  }
  return positions;
}

const volume = new Cesium.PolylineVolumeGeometry({
  vertexFormat : Cesium.VertexFormat.POSITION_ONLY,
  polylinePositions : Cesium.Cartesian3.fromDegreesArray([
    -72.0, 40.0,
    -70.0, 35.0
  ]),
  shapePositions : computeCircle(100000.0)
});

Demo:

Cesium Sandcastle Polyline Volume Demo

See:

PolylineVolumeGeometry#createGeometry

Members

packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.PolylineVolumeGeometry.createGeometry(polylineVolumeGeometry) → Geometry|undefined

计算带有量的多线的几何表示,包括它的顶点,指数和边框.

Name	Type	Description
`polylineVolumeGeometry`	PolylineVolumeGeometry	多线体积描述.

Returns:

计算出的顶点和指数.

static Cesium.PolylineVolumeGeometry.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`	PolylineVolumeGeometry		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.PolylineVolumeGeometry.unpack(array, startingIndex, result) → PolylineVolumeGeometry

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`	PolylineVolumeGeometry		optional 存储结果的对象.

Returns:

如果不提供经修改的结果参数或一个新的PolylineVolumeGeometry实例.