cesium-2-entity
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.<DataSource>
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.<DataSource>
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 : string
owner : DataSource|CompositeEntityCollection
show : boolean
values : Array.<Entity> // 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<promise.类型>,后面需要使用.then(成功函数,失败函数)来得到类型
add(dataSource) → Promise.<DataSource>
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<promise.类型>,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){})
})