Line 线类
判定
isLine()
typescript
const isLine: (tar: any) => tar is Line属性
readonly id: string 唯一标识
name: string|undefined 名称
property: Recorc<string|symbol,any> 属性
parent: Entity 父级节点
show: boolean 是否显示
redonly label: Label|undefined
positions: Point3d[] | [number, number, (number | undefined)?][] | ((time: JulianDate, result: object) => Cartesian3[] | [number, number, number][]) 坐标
color: MapColor 颜色
width: number 线宽
material: MaterialProperty|undefined 材质
clampToGround: boolean 贴地
shadows: boolean 阴影
zIndex: number 层级
方法
focus 聚焦
duration过渡时间（秒）
typescript
focus(duration?: number): voiddestroy 销毁
typescript
destroy(): boolean