Cesium JS API
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EllipseOutlineGeometry

EllipseOutlineGeometry 是一个用于创建椭圆轮廓线几何体的类。椭圆轮廓线几何体是一个用线段表示的椭圆的形状,该几何体在三维场景中显示为一组连续的线段。

语法

var geometry = Cesium.EllipseOutlineGeometry({
 center : new Cesium.Cartesian3(),
 semiMajorAxis : Number,
 semiMinorAxis : Number,
 ellipsoid : Cesium.Ellipsoid,
 height : Number,
 extrudedHeight : Number,
 rotation : Number,
 granularity : Number
});

参数

  • options 一个对象字面量,具备以下属性:

    • center : Cartesian3 | undefined (可选) , 必须是WGS84坐标系中的三维笛卡尔坐标。椭圆的中心点。 默认值:原点。

    • semiMajorAxis : Number 一个必须大于零的数字,表示椭圆的长半轴长度。 如果radii没有指定,则此参数为必需的。如果同时指定radii,则此参数会被忽略。 默认值:1.0

    • semiMinorAxis : Number 一个必须大于零的数字,表示椭圆的短半轴长度。如果radii没有指定,则此参数为必需的。如果同时指定radii,则此参数会被忽略。 默认值:1.0

    • ellipsoid : Ellipsoid (可选) 指定椭圆所在的椭球体。 默认值:Ellipsoid.WGS84

    • height : Number (可选) 椭圆相对于椭球面的高度。默认值:0.

    • extrudedHeight : Number (可选) 椭圆的挤压高度。如果未指定,椭圆将不会被挤压成3D形状。默认值:0。

    • rotation : Number (可选) 相对于矩阵的旋转角度,单位弧度。默认值:0。

    • granularity : Number (可选) 此椭圆轮廓线的表示粒度。此参数控制轮廓线的长度,值越小轮廓线越精细,值越大轮廓线越简略。 默认值:0.02。

返回值

Geometry - 表示椭圆轮廓线几何体的几何体实例。

示例


// 创建一个czml文档实体
var entity = viewer.entities.add({
   name : 'EllipseOutlineGeometry',
   polyline : {
      positions : Cesium.Cartesian3.fromDegreesArrayHeights([
        -75, 45, 0,
        -125, 45, 0,
        -125, 55, 0,
        -75, 55, 0,
        -75, 45, 0
      ]),
      width : 5,
      outlineWidth : 2,
      material : Cesium.Color.YELLOW.withAlpha(0.5),
      depthFailMaterial : new Cesium.PolylineOutlineMaterialProperty({
         color : Cesium.Color.RED,
         outlineWidth : 2,
         outlineColor : Cesium.Color.BLACK
      })
   }
});

// 根据中心点和半径创建一个椭圆轮廓线几何体
var ellipseOutline = new Cesium.GeometryInstance({
   geometry : Cesium.EllipseOutlineGeometry.fromCenter({
      center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
      semiMajorAxis : 70000.0,
      semiMinorAxis : 40000.0,
      rotation : Cesium.Math.toRadians(45.0)
   }),
   id : 'ellipse',
   attributes : {
      color : Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(0.5, 0.5, 1.0, 0.5))
   }
});

// 把椭圆轮廓线几何体添加到场景
viewer.scene.primitives.add(new Cesium.Primitive({
   geometryInstances : [ellipseOutline],
   appearance : new Cesium.PerInstanceColorAppearance()
}));

更多示例

参考