1、四层结构


viewer –> datasources(DataSourceCollection类型) –> datasource –> entities(EntityCollection类型) –> entity


需要学习的方向是:只需要注意每个层与层之间的关系和entity实例如何创建即可

2、DataSourceCollection

增:
add(dataSource) → Promise.
删:(destroy一般为boolean,指是否需要直接销毁该datasource)
remove(dataSource, destroy) → boolean
removeAll(destroy)
查:
indexOf(dataSource) → number
getByName(name) → Array.
get(index) → DataSource
contains(dataSource) → boolean
改:
该类型数据一般是指向型,直接调出属性直接修改即可
改变层级关系(特殊):
lower(dataSource)
lowerToBottom(dataSource)
raise(dataSource)
raiseToTop(dataSource)

3、datasource

这是一个抽象类,有各种实现方式

一般只会用到他的三个属性:entities、name和show

4、entities(EntityCollection类型)

增:
add(entity) → Entity
getOrCreateEntity(id) → Entity
删:
removeAll()
removeById(id) → boolean
remove(entity) → boolean
查:
contains(entity) → boolean
getById(id) → Entity|undefined
改:

重要属性:

id : stringowner : DataSource|CompositeEntityCollectionshow : booleanvalues : Array.  // 全部的entity

5、创建新的entity

一些实例:
https://www.jianshu.com/p/4250e822c9c8

6、代码

需要注意的是这里的add()方法得到的是,后面需要使用.then(成功函数,失败函数)来得到类型
add(dataSource) → Promise.
这种类怎么创建和怎么用见:
https://blog.csdn.net/ABCFF12333/article/details/118188018

  // 注意add()方法得到的是,后面需要使用.then(成功函数,失败函数)来得到类型  // 注意这是异步方法  viewer.dataSources.add(new Cesium.CustomDataSource("pointDataSource1")).then(function(value){    var pointDataSource = value;    pointDataSource.show = true;    var point1 = pointDataSource.entities.add({      id: "point1",      name: "point1",      position: Cesium.Cartesian3.fromDegrees(109, 34, 0),      point: {        pixelsize: 10,        color: Cesium.Color.YELLOW,        outlineWidth: 2,        outlineColor: Cesium.Color.RED      }    });    var point2 = pointDataSource.entities.add({      id: "point2",      name: "point2",      position: Cesium.Cartesian3.fromDegrees(110, 35, 0),      point: {        pixelsize: 10,        color: Cesium.Color.YELLOW,        outlineWidth: 2,        outlineColor: Cesium.Color.RED      }    })  },function(error){})  viewer.dataSources.add(new Cesium.CustomDataSource("polygonDatasource")).then(function(value){    var polygonDatasource = value;    polygonDatasource.show = true;    polygonDatasource.entities.add({      id: "polygon1",      name: "polygon1",      polygon: {        hierarchy: Cesium.Cartesian3.fromDegreesArray([          109.080842, 45.002073,          105.91517, 45.002073,          104.058488, 44.996596,          104.053011, 43.002989,          104.053011, 41.003906,          105.728954, 40.998429,          107.919731, 41.003906,          109.04798, 40.998429,          111.047063, 40.998429,          111.047063, 42.000709,          111.047063, 44.476286,          111.05254, 45.002073,          109.080842, 45.002073        ]),        height: 10,  // 必须要有高度,否则没有边框        material: Cesium.Color.GREEN,        outline: true,        outlineColor: Cesium.Color.RED,        outlineWidth: 2,        fill: true      }    })  },function(error){})})