Class: RiverGeometry

// 1. create a polygon from points
var polygon = new Cesium.RiverGeometry({
  polygonHierarchy : new Cesium.PolygonHierarchy(
    Cesium.Cartesian3.fromDegreesArray([
      -72.0, 40.0,
      -70.0, 35.0,
      -75.0, 30.0,
      -70.0, 30.0,
      -68.0, 40.0
    ])
  )
});
var geometry = Cesium.RiverGeometry.createGeometry(polygon);

// 2. create a nested polygon with holes
var polygonWithHole = new Cesium.RiverGeometry({
  polygonHierarchy : new Cesium.PolygonHierarchy(
    Cesium.Cartesian3.fromDegreesArray([
      -109.0, 30.0,
      -95.0, 30.0,
      -95.0, 40.0,
      -109.0, 40.0
    ]),
    [new Cesium.PolygonHierarchy(
      Cesium.Cartesian3.fromDegreesArray([
        -107.0, 31.0,
        -107.0, 39.0,
        -97.0, 39.0,
        -97.0, 31.0
      ]),
      [new Cesium.PolygonHierarchy(
        Cesium.Cartesian3.fromDegreesArray([
          -105.0, 33.0,
          -99.0, 33.0,
          -99.0, 37.0,
          -105.0, 37.0
        ]),
        [new Cesium.PolygonHierarchy(
          Cesium.Cartesian3.fromDegreesArray([
            -103.0, 34.0,
            -101.0, 34.0,
            -101.0, 36.0,
            -103.0, 36.0
          ])
        )]
      )]
    )]
  )
});
var geometry = Cesium.RiverGeometry.createGeometry(polygonWithHole);

// 3. create extruded polygon
var extrudedPolygon = new Cesium.RiverGeometry({
  polygonHierarchy : new Cesium.PolygonHierarchy(
    Cesium.Cartesian3.fromDegreesArray([
      -72.0, 40.0,
      -70.0, 35.0,
      -75.0, 30.0,
      -70.0, 30.0,
      -68.0, 40.0
    ])
  ),
  extrudedHeight: 300000
});
var geometry = Cesium.RiverGeometry.createGeometry(extrudedPolygon);

Members

_indices

feat:2106 河流覆盖物类型 传入自定义顶点indices 传入自定义UV坐标

packedLengthNumber

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

Methods

RiverGeometry.computeRectangle(options, result){Cesium.Rectangle}

engineExtensions/core/RiverGeometry.js, line 1064

Returns the bounding rectangle given the provided options

Name	Type	Description
options	Object	Object with the following properties: Name Type Default Description polygonHierarchy PolygonHierarchy A polygon hierarchy that can include holes. granularity Number Cesium.Math.RADIANS_PER_DEGREE 可选 The distance, in radians, between each latitude and longitude. Determines the number of positions sampled. arcType Cesium.ArcType Cesium.ArcType.GEODESIC 可选 The type of line the polygon edges must follow. Valid options are Cesium.ArcType.GEODESIC and Cesium.ArcType.RHUMB. ellipsoid Cesium.Ellipsoid Cesium.Ellipsoid.WGS84 可选 The ellipsoid to be used as a reference.
result	Cesium.Rectangle	可选 An object in which to store the result.

Returns:

Type	Description
Cesium.Rectangle	The result rectangle

RiverGeometry.createGeometry(polygonGeometry){Cesium.Geometry|undefined}

engineExtensions/core/RiverGeometry.js, line 1104

Computes the geometric representation of a polygon, including its vertices, indices, and a bounding sphere.

Name	Type	Description
polygonGeometry	RiverGeometry	A description of the polygon.

Returns:

Type	Description
Cesium.Geometry | undefined	The computed vertices and indices.

RiverGeometry.fromPositions(options){RiverGeometry}

engineExtensions/core/RiverGeometry.js, line 896

A description of a polygon from an array of positions. Polygon geometry can be rendered with both Primitive and GroundPrimitive.

Name	Type	Description
options	Object	Object with the following properties: Name Type Default Description positions Array.<Cesium.Cartesian3> An array of positions that Cesium.defined the corner points of the polygon. height Number 0.0 可选 The height of the polygon. extrudedHeight Number 可选 The height of the polygon extrusion. vertexFormat Cesium.VertexFormat Cesium.VertexFormat.DEFAULT 可选 The vertex attributes to be computed. indices Array.<Number> 可选 自定义顶点索引 st Float32Array 可选 自定义UV坐标 stRotation Number 0.0 可选 The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise. ellipsoid Cesium.Ellipsoid Cesium.Ellipsoid.WGS84 可选 The ellipsoid to be used as a reference. granularity Number Cesium.Math.RADIANS_PER_DEGREE 可选 The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer. perPositionHeight Boolean false 可选 Use the height of options.positions for each position instead of using options.height to determine the height. closeTop Boolean true 可选 When false, leaves off the top of an extruded polygon open. closeBottom Boolean true 可选 When false, leaves off the bottom of an extruded polygon open. arcType Cesium.ArcType Cesium.ArcType.GEODESIC 可选 The type of line the polygon edges must follow. Valid options are Cesium.ArcType.GEODESIC and Cesium.ArcType.RHUMB.

See:

• RiverGeometry#createGeometry

Returns:

Type	Description
RiverGeometry

Example

// create a polygon from points
var polygon = Cesium.RiverGeometry.fromPositions({
  positions : Cesium.Cartesian3.fromDegreesArray([
    -72.0, 40.0,
    -70.0, 35.0,
    -75.0, 30.0,
    -70.0, 30.0,
    -68.0, 40.0
  ])
});
var geometry = Cesium.RiverGeometry.createGeometry(polygon);

RiverGeometry.pack(value, array, startingIndex){Array.<Number>}

engineExtensions/core/RiverGeometry.js, line 938

Stores the provided instance into the provided array.

Name	Type	Default	Description
value	RiverGeometry		The value to pack.
array	Array.<Number>		The array to pack into.
startingIndex	Number	0	可选 The index into the array at which to start packing the elements.

Returns:

Type	Description
Array.<Number>	The array that was packed into

RiverGeometry.unpack(array, startingIndex, result)

engineExtensions/core/RiverGeometry.js, line 986

Retrieves an instance from a packed array.

Name	Type	Default	Description
array	Array.<Number>		The packed array.
startingIndex	Number	0	可选 The starting index of the element to be unpacked.
result	RiverGeometry		可选 The object into which to store the result.