如何使用javascript引用铯多边形层次结构中其他实体的位置? [英] How to reference positions of other entities in polygon hierarchy of Cesium using javascript?
问题描述
我使用 Cesium 来可视化我的场景,我想在 JavaScript 中创建一个多边形,使用其他移动实体的位置作为其端点的参考.正如这个问题的回答中所建议的,使用CZML.
I am using Cesium to visualize my scenario and I want to create a polygon in JavaScript using position of other moving entities as references for its endpoints. As suggested in the answer of this question by using CZML.
我想知道我是否可以在 JavaScript 中做到(将其他实体的位置引用为多边形的端点).我尝试了几件事,但没有奏效,例如,以下是我的代码:
I was wondering if I can do it (referencing positions of other entities as endpoints of my polygon) in JavaScript. I tried a few things and it didn't work, for example, following is my code:
var newPoly= viewer.entities.add({
id : resourceSet[objIndex].id+"poly",
name:resourceSet[objIndex].id+"poly",
availability : new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
start : start,
stop : stop
})]),
polygon:{
hierarchy :{
positions:{
references:[
Cesium.ReferenceProperty.fromString(collection, ''+entityName+'#position'),
Cesium.ReferenceProperty.fromString(collection, ''+baseEntity[0].id+'#position'),
Cesium.ReferenceProperty.fromString(collection, ''+baseEntity[1].id+'#position')
]
}
},
material :Cesium.Color.AQUA.withAlpha(0.5),
perPositionHeight : true,
show : true
},
show: true
})
对于参考我也试过:
- 仅使用实体和位置,例如:
entity.position
- 使用
entity$position
.
他们都没有工作!
推荐答案
实体属性有一个 getValue 函数,它以 JulianDate 时间作为参数并返回当时的值.要获得职位,您应该能够执行类似
Entity properties have a function getValue that takes a JulianDate time as a parameter and returns the value at that time. To get a position, you should be able to do something like
var position = entity.position.getValue(viewer.clock.currentTime);
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