PolylineGeometry - CesiumJS API 文档

new Cesium.PolylineGeometry(options)

描述一个多线条模型作为线条;前两个位置定义了线段, 和每个附加位置定义了上一个位置的线段。聚线能够以材料显示.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`positions`	Array.<Cartesian3>		An array of `Cartesian3` defining the positions in the polyline as a line strip.
`width`	number	`1.0`	optional 宽度以像素表示.
`colors`	Array.<Color>		optional An Array of `Color` defining the per vertex or per segment colors.
`colorsPerVertex`	boolean	`false`	optional A boolean that determines whether the colors will be flat across each segment of the line or interpolated across the vertices.
`arcType`	ArcType	`ArcType.GEODESIC`	optional The type of line the polyline segments must follow.
`granularity`	number	`CesiumMath.RADIANS_PER_DEGREE`	optional The distance, in radians, between each latitude and longitude if options.arcType is not ArcType.NONE. Determines the number of positions in the buffer.
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid to be used as a reference.

Throws:

DeveloperError : At least two positions are required.
DeveloperError : width must be greater than or equal to one.
DeveloperError : colors has an invalid length.

Example:

// A polyline with two connected line segments
const polyline = new Cesium.PolylineGeometry({
  positions : Cesium.Cartesian3.fromDegreesArray([
    0.0, 0.0,
    5.0, 0.0,
    5.0, 5.0
  ]),
  width : 10.0
});
const geometry = Cesium.PolylineGeometry.createGeometry(polyline);

Demo:

Cesium Sandcastle Polyline Demo

See:

PolylineGeometry#createGeometry

Members

packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.PolylineGeometry.createGeometry(polylineGeometry) → Geometry|undefined

计算一个多线的几何表示,包括它的顶点,指数和边框.

Name	Type	Description
`polylineGeometry`	PolylineGeometry	聚线描述.

Returns:

计算出的顶点和指数.

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

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`	PolylineGeometry		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PolylineGeometry实例.