Cesium JS API
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PolylineGeometryUpdater

PolylineGeometryUpdater是一个用于更新Cesium中PolylineGeometry的辅助类。


概述

PolylineGeometryUpdater可以通过对应的Primitive实例来更新PolylineGeometry的位置、颜色等属性。它会在底层检测属性的变化,并将变化应用到Geometry实例中。使用PolylineGeometryUpdater可以方便地实现Polyline对象的实时更新,从而达到交互效果的呈现。

构造函数

new Cesium.PolylineGeometryUpdater(options);

options参数按照如下定义:

{
    entity : entity,
    scene : scene,
    geometry : geometry,
}

属性

options

PolylineGeometryUpdater的构造函数参数。

entity

与此 PolylineGeometryUpdater 关联的 entity 实例。

geometry

此 PolylineGeometryUpdater 所管理的 PolylineGeometry 实例。

isDynamic

一个布尔值,指示此 PolylineGeometryUpdater 实例的 PolylineGeometry 是否动态更新。

方法

isDestroyed

当这个实例不再使用时,调用此方法以释放与之相关的资源。已销毁的实例不应再使用。

boolean PolylineGeometryUpdater.isDestroyed()

返回:

如果 PolylineGeometryUpdater 已被销毁 ,则为 true ;否则为 false。

update

更新PolylineGeometry。

boolean PolylineGeometryUpdater.update(time)

参数:

返回:

如果一个新的线几何体实例被创建,则为 true ;否则为 false。

isUpdating

返回此 PolylineGeometryUpdater 是在更新中还是没有更新。

boolean PolylineGeometryUpdater.isUpdating()

返回:

如果此 PolylineGeometryUpdater 的更新操作正在进行中,则为 true;

否则,如果关闭更新,则为 false。

事件

  • onTerrainChanged:当地形数据更改时触发此事件。
PolylineGeometryUpdater.onTerrainChanged.addEventListener(callback);
  • onStaticPropertyChanged:当呈现属性更改为静态时触发此事件。
PolylineGeometryUpdater.onStaticPropertyChanged.addEventListener(callback);
  • onDynamicPropertyChanged:当呈现属性更改为动态时触发此事件。
PolylineGeometryUpdater.onDynamicPropertyChanged.addEventListener(callback);
  • onGeometryChanged:当呈现属性更改为静态时触发此事件。
PolylineGeometryUpdater.onGeometryChanged.addEventListener(callback);

回调函数参数

以上事件所触发的回调函数都带有如下参数:

  • updater:此 PolylineGeometryUpdater 实例。

示例

var viewer = new Cesium.Viewer('cesiumContainer');
var polyline = viewer.entities.add({
    polyline : {
        positions : Cesium.Cartesian3.fromDegreesArray([
            -75, 35,
            -125, 35
        ]),
        width : 10.0,
        material : Cesium.Color.RED
    }
});

var polylineUpdater = new Cesium.PolylineGeometryUpdater({
    entityType : polyline,
    scene : viewer.scene,
    geometry : polyline.polyline
});

其中,使用了Entity实例来添加了一条折线。然后,我们创建了一个PolylineGeometryUpdater实例,并将其与折线对应的Geometry对象关联。这样,我们就可以使用这个PolylineGeometryUpdater实例来更新折线的属性了。