KBE3D / KBCore / Cesium / EllipseGeometry

类: EllipseGeometry

A description of an ellipse on an ellipsoid. Ellipse geometry can be rendered with both Primitive and GroundPrimitive.

示例

// 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);

参数

Object with the following properties:

参数

The ellipse's center point in the fixed frame.

参数

The length of the ellipse's semi-major axis in meters.

参数

The length of the ellipse's semi-minor axis in meters.

参数

The ellipsoid the ellipse will be on.

参数

The distance in meters between the ellipse and the ellipsoid surface.

参数

The distance in meters between the ellipse's extruded face and the ellipsoid surface.

参数

The angle of rotation counter-clockwise from north.

参数

The rotation of the texture coordinates counter-clockwise from north.

参数

The angular distance between points on the ellipse in radians.

参数

The vertex attributes to be computed.

属性

packedLength

static packedLength: number

The number of elements used to pack the object into an array.

方法

pack()

static pack(value: EllipseGeometry, array: number[], startingIndex?: number): number[]

Stores the provided instance into the provided array.

参数

value

EllipseGeometry

The value to pack.

array

number[]

The array to pack into.

startingIndex?

number

The index into the array at which to start packing the elements.

返回

number[]

The array that was packed into

---

unpack()

static unpack(array: number[], startingIndex?: number, result?: EllipseGeometry): EllipseGeometry

Retrieves an instance from a packed array.

参数

array

number[]

The packed array.

startingIndex?

number

The starting index of the element to be unpacked.

result?

EllipseGeometry

The object into which to store the result.

返回

EllipseGeometry

The modified result parameter or a new EllipseGeometry instance if one was not provided.

---

computeRectangle()

static computeRectangle(options: { center: Cartesian3; semiMajorAxis: number; semiMinorAxis: number; ellipsoid?: Ellipsoid; rotation?: number; granularity?: number; }, result?: Rectangle): Rectangle

Computes the bounding rectangle based on the provided options

参数

options

Object with the following properties:

center

Cartesian3

The ellipse's center point in the fixed frame.

semiMajorAxis

number

The length of the ellipse's semi-major axis in meters.

semiMinorAxis

number

The length of the ellipse's semi-minor axis in meters.

ellipsoid?

Ellipsoid

The ellipsoid the ellipse will be on.

rotation?

number

The angle of rotation counter-clockwise from north.

granularity?

number

The angular distance between points on the ellipse in radians.

result?

Rectangle

An object in which to store the result

返回

Rectangle

The result rectangle

---

createGeometry()

static createGeometry(ellipseGeometry: EllipseGeometry): Geometry | undefined

Computes the geometric representation of a ellipse on an ellipsoid, including its vertices, indices, and a bounding sphere.

参数

ellipseGeometry

EllipseGeometry

A description of the ellipse.

返回

Geometry | undefined

The computed vertices and indices.

构造函数

构造函数

new EllipseGeometry(options: { center: Cartesian3; semiMajorAxis: number; semiMinorAxis: number; ellipsoid?: Ellipsoid; height?: number; extrudedHeight?: number; rotation?: number; stRotation?: number; granularity?: number; vertexFormat?: VertexFormat; }): EllipseGeometry

参数

options

center

Cartesian3

semiMajorAxis

number

semiMinorAxis

number

ellipsoid?

Ellipsoid

height?

number

extrudedHeight?

number

rotation?

number

stRotation?

number

granularity?

number

vertexFormat?

VertexFormat

返回

EllipseGeometry