CircleGeometry - CesiumJS API 文档

new Cesium.CircleGeometry(options)

A description of a circle on the ellipsoid. Circle geometry can be rendered with both Primitive and GroundPrimitive.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`center`	Cartesian3		圆形中心点在固定框中.
`radius`	number		半径为米.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid the circle will be on.
`height`	number	`0.0`	optional 圆圈与椭圆表面之间的米数距离.
`granularity`	number	`0.02`	optional The angular distance between points on the circle in radians.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.
`extrudedHeight`	number	`0.0`	optional 圆形外凸面与椭圆表面之间的米数距离.
`stRotation`	number	`0.0`	optional 纹理坐标的旋转,以弧度表示. 正旋转是逆时针.

Throws:

DeveloperError : radius must be greater than zero.
DeveloperError : granularity must be greater than zero.

Example:

// Create a circle.
const circle = new Cesium.CircleGeometry({
  center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
  radius : 100000.0
});
const geometry = Cesium.CircleGeometry.createGeometry(circle);

See:

Members

static Cesium.CircleGeometry.packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.CircleGeometry.createGeometry(circleGeometry) → Geometry|undefined

计算椭圆上一个圆的几何表示,包括它的顶点,指数,和边框.

Name	Type	Description
`circleGeometry`	CircleGeometry	圆圆的描述.

Returns:

计算出的顶点和指数.

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

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`	CircleGeometry		optional 存储结果的对象.

Returns:

未提供修改的结果参数或新圆形几何实例.