由于cesium 1.107+ 的图元(Primitive) 已经不支持 readyPromise。

但是个人感觉比较好用,于是用了一个插件来实现。

用法:

// 定义图元并添加,和之前一样
const boxGreen = new BoxPrimitive({color: "#ff0000"
})
viewer.scene.primitives.add(boxGreen.primitive)// 这个是新增的,创建一个 readyPromise 辅助器
const readyHelper = new ReadyPromiseHelper(viewer)
readyHelper.readyPromise(boxGreen.primitive).then(() => {console.log("primitive is ready");
})

ReadyPromiseHelper 实现

export class ReadyPromiseHelper {constructor(viewer) {this.viewer = viewer;this._primitives = new Map();viewer.scene.postRender.addEventListener(() => {const needDelete = []this._primitives.forEach((readyCallback, primitive) => {if (primitive.ready) {readyCallback()needDelete.push(primitive)}})needDelete.forEach(primitive => {this._primitives.delete(primitive)})})}readyPromise(primitive) {let readyCallback;const promise = new Promise((resolve, reject) => {readyCallback = resolve;});this._primitives.set(primitive, readyCallback)return promise;}
}