WallGeometry - CesiumJS API 文档

new Cesium.WallGeometry(options)

墙壁的描述,与 NT 0 线条字符串类似. 墙由一系列点来定义, 将它挤到地上可以选择,它们可以向下挤压到指定的高度.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`positions`	Array.<Cartesian3>		一系列笛卡尔天体,即壁的点.
`granularity`	number	`CesiumMath.RADIANS_PER_DEGREE`	optional The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
`maximumHeights`	Array.<number>		optional 与 NT 0 位置 NT 1 平行的阵列,赋予最大高度墙壁位于 NT 0 位置 NT 1 . 如果未定义,则使用每个位置的高度 .
`minimumHeights`	Array.<number>		optional An array parallel to `positions` that give the minimum height of the 墙壁位于 NT 0 位置 NT 1 . 如果未定义,则每个位置的高度为0.0.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid for coordinate manipulation
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.

Throws:

DeveloperError : positions length must be greater than or equal to 2.
DeveloperError : positions and maximumHeights must have the same length.
DeveloperError : positions and minimumHeights must have the same length.

Example:

// create a wall that spans from ground level to 10000 meters
const wall = new Cesium.WallGeometry({
  positions : Cesium.Cartesian3.fromDegreesArrayHeights([
    19.0, 47.0, 10000.0,
    19.0, 48.0, 10000.0,
    20.0, 48.0, 10000.0,
    20.0, 47.0, 10000.0,
    19.0, 47.0, 10000.0
  ])
});
const geometry = Cesium.WallGeometry.createGeometry(wall);

Demo:

Cesium Sandcastle Wall Demo

See:

WallGeometry#createGeometry
WallGeometry#fromConstantHeight

Members

packedLength : number

用于将对象组合成数组的元素数量.

Methods

static Cesium.WallGeometry.createGeometry(wallGeometry) → Geometry|undefined

计算一面墙的几何代表,包括它的顶点,指数,以及边框.

Name	Type	Description
`wallGeometry`	WallGeometry	城墙简介.

Returns:

计算出的顶点和指数.

static Cesium.WallGeometry.fromConstantHeights(options) → WallGeometry

墙壁的描述,与 NT 0 线条字符串类似. 墙由一系列点来定义, 将它挤到地上可以选择,它们可以向下挤压到指定的高度.

Name Type Description

options

object

下列属性的对象 :

Name	Type	Default	Description
`positions`	Array.<Cartesian3>		一系列笛卡尔天体,即壁的点.
`maximumHeight`	number		optional 定义最大高度的常数墙壁位于 NT 0 位置 NT 1 . 如果未定义,则使用每个位置的高度 .
`minimumHeight`	number		optional 定义最小高度的常数墙壁位于 NT 0 位置 NT 1 . 如果未定义,则每个位置的高度为0.0.
`ellipsoid`	Ellipsoid	`Ellipsoid.default`	optional The ellipsoid for coordinate manipulation
`vertexFormat`	VertexFormat	`VertexFormat.DEFAULT`	optional The vertex attributes to be computed.

Returns:

Example:

// create a wall that spans from 10000 meters to 20000 meters
const wall = Cesium.WallGeometry.fromConstantHeights({
  positions : Cesium.Cartesian3.fromDegreesArray([
    19.0, 47.0,
    19.0, 48.0,
    20.0, 48.0,
    20.0, 47.0,
    19.0, 47.0,
  ]),
  minimumHeight : 20000.0,
  maximumHeight : 10000.0
});
const geometry = Cesium.WallGeometry.createGeometry(wall);

See:

WallGeometry#createGeometry

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

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`	WallGeometry		optional 存储结果的对象.

Returns:

未提供修改的结果参数或新的WallGeometry实例.