cesium 实现地球自转

我们用typescript 实现一个地球自转工具类、

```javascript
/**

• 地球自转
  / export class GlobalRotate{ private viewer: any = null; private delta = 0; private delayTime: any = null; constructor(_viewer: any) { this.viewer = _viewer; } /*

  • 开启地图自转效果/和时钟无关
  • @param delta 每帧旋转的角度，正负值代表方向
  • @param delay 执行多少时间后结束，单位：ms 0为不自动结束
  • @param cb 结束后执行的回调函数
    / public start(delta: number = 0.006, delay: number = 0, cb: any = null) { this.stop(); this.delta = delta; this.viewer.scene.postUpdate.addEventListener(this.onTickCallback, this); if (delay > 0) { this.delayTime = setTimeout(() => { this.stop(); cb && cb(); }, delay); } } /*
  • 停止自转
    */
    public stop() {
    this.viewer.clock.multiplier = 1; //速度
    this.viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
    this.viewer.scene.postUpdate.removeEventListener(this.onTickCallback, this);
    this.viewer.scene.postUpdate.removeEventListener(this.onPostUpdate, this);
    clearTimeout(this.delayTime);

  }
  /**
  * 开启地图自转效果/和时钟无关
  * @param multiplier clock的multiplier属性
  * @param delay 执行多少时间后结束，单位：ms 0为不自动结束

 更多参考 https://xiaozhuanlan.com/topic/2063589174