Cesium JS API
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PolygonGraphics

PolygonGraphics是CesiumJS中一种用于绘制多边形形状的图形对象,它可以表示具有任意数量的点和轮廓线的多边形。

构造函数

创建一个PolygonGraphics对象的方法如下:

let polygonGraphics = new Cesium.PolygonGraphics(options);

其中,options参数是一个包含多边形的所有属性及其属性值的对象。

属性

PolygonGraphics对象可以设置的属性如下:

hierarchy

  • 类型:Cartesian3[] | PolylineHierarchy[]
  • 默认值:无

多边形的点集,可以是一个Cartesian3类型数组,也可以是一个PolylineHierarchy类型数组。

height

  • 类型:Number
  • 默认值:0

多边形的高度值,表示多边形所在的高度。

extrudedHeight

  • 类型:Number
  • 默认值:0

如果设置了该属性,则多边形将为挤出的表面。

vertexFormat

  • 类型:VertexFormat
  • 默认值:VertexFormat.DEFAULT

多边形的顶点格式。

stRotation

  • 类型:Number
  • 默认值:0

多边形的纹理坐标旋转角度。

granularity

  • 类型:Number
  • 默认值:0.1

用于绘制多边形轮廓的步长。

perPositionHeight

  • 类型:Boolean
  • 默认值:false

指示每个点是否使用独立的高度值。

closeTop

  • 类型:Boolean
  • 默认值:true

指示是否关闭多边形的顶部。如果该属性为false,则多边形的顶部是一个开放的表面。

closeBottom

  • 类型:Boolean
  • 默认值:true

指示是否关闭多边形的底部。如果该属性为false,则多边形的底部是一个开放的表面。

offsetAttribute

  • 类型:Number
  • 默认值:undefined

指示多边形面片的偏移属性。

方法

PolygonGraphics对象包含的方法如下:

clone(result)

克隆多边形对象并返回新的PolygonGraphics对象。

参数:

  • resultPolygonGraphics类型,可选。表示克隆得到的新对象。

返回值:

  • PolygonGraphics类型。克隆得到的多边形对象。

merge(source)

将另一个PolygonGraphics对象的属性值合并到当前对象中。

参数:

  • sourcePolygonGraphics类型。要合并的源对象。

equals(other)

判断当前多边形对象是否与另一个多边形对象相等。

参数:

  • otherObject类型。要比较的另一个对象。

返回值:

  • Boolean类型。如果当前对象与另一个对象相等,则返回true;否则返回false。