EllipseGeometry - CesiumJS API 文档

new Cesium.EllipseGeometry(options)

A description of an ellipse on an ellipsoid. Ellipse 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		椭圆形中央点在固定框中.
`semiMajorAxis`	number		椭圆半主轴的长度以米计.
`semiMinorAxis`	number		椭圆半微轴的长度以米计.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid the ellipse will be on.
`height`	number	`0.0`	optional 椭圆与椭圆表面之间以米计的距离.
`extrudedHeight`	number		optional The distance in meters between the ellipse's extruded face and the ellipsoid surface.
`rotation`	number	`0.0`	optional 从北边逆时针旋转的角度.
`stRotation`	number	`0.0`	optional 纹理坐标逆时针从北向旋转.
`granularity`	number	`CesiumMath.RADIANS_PER_DEGREE`	optional The angular distance between points on the ellipse in radians.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.

Throws:

DeveloperError : semiMajorAxis and semiMinorAxis must be greater than zero.
DeveloperError : semiMajorAxis must be greater than or equal to the semiMinorAxis.
DeveloperError : granularity must be greater than zero.

Example:

// Create an ellipse.
const ellipse = new Cesium.EllipseGeometry({
  center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
  semiMajorAxis : 500000.0,
  semiMinorAxis : 300000.0,
  rotation : Cesium.Math.toRadians(60.0)
});
const geometry = Cesium.EllipseGeometry.createGeometry(ellipse);

See:

EllipseGeometry.createGeometry

Members

static Cesium.EllipseGeometry.packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.EllipseGeometry.computeRectangle(options, result) → Rectangle

根据提供的选项计算边框矩形

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`center`	Cartesian3		椭圆形中央点在固定框中.
`semiMajorAxis`	number		椭圆半主轴的长度以米计.
`semiMinorAxis`	number		椭圆半微轴的长度以米计.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid the ellipse will be on.
`rotation`	number	`0.0`	optional 从北边逆时针旋转的角度.
`granularity`	number	`CesiumMath.RADIANS_PER_DEGREE`	optional The angular distance between points on the ellipse in radians.

result Rectangle optional 存储结果的对象

Returns:

结果矩形

static Cesium.EllipseGeometry.createGeometry(ellipseGeometry) → Geometry|undefined

计算椭圆上椭圆的几何表示,包括它的顶点,指数,和边框.

Name	Type	Description
`ellipseGeometry`	EllipseGeometry	椭圆形的描述.

Returns:

计算出的顶点和指数.

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

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`	EllipseGeometry		optional 存储结果的对象.

Returns:

如果不提供修改的结果参数或新的椭圆图形实例.