HarmonyOS 期望提供重力传感器坐标转换为角度，方向示例？

Question

如题：HarmonyOS 期望提供重力传感器坐标转换为角度，方向示例？

Answer 1

参考示例如下：

import sensor from '@ohos.sensor';
import base from '@ohos.base';

export function onDegree(callback: base.Callback<string>): void {
  sensor.on(sensor.SensorId.GRAVITY, (data: sensor.GravityResponse) => {
    let degree: number = -1;
    let rotation: string = 'INVALID';
    degree = CalDegree(data.x, data.y, data.z)
    console.log("---abc---" + degree + " degree")
    if (degree >= 0 && (degree <= 30 || degree >= 330)) {
      rotation = "ROTATION_0";
    } else if (degree >= 60 && degree <= 120) { // Use ROTATION_90 when degree range is [60, 120]
      rotation = "ROTATION_90";
    } else if (degree >= 150 && degree <= 210) { // Use ROTATION_180 when degree range is [150, 210]
      rotation = "ROTATION_180";
    } else if (degree >= 240 && degree <= 300) { // Use ROTATION_270 when degree range is [240, 300]
      rotation = "ROTATION_270";
    }
    callback(rotation);
  });
}

function CalDegree(x: number, y: number, z: number): number {
  let degree: number = -1;
  // 3 为 有效_增量_角度_阈值_系数
  if ((x * x + y * y) * 3 < z * z) {
    return degree;
  }
  degree = 90 - (Number)(Math.round(Math.atan2(y, -x) / Math.PI * 180));
  return degree >= 0 ? degree % 360 : degree % 360 + 360;
}

@Entry
@Component
struct SensorDemo {
  @State message: string = 'Hello World';

  build() {
    RelativeContainer() {
      Button('获取手机设备朝向')
        .onClick(() => {
          onDegree((data) => {
            console.log("---abc---" + data);
          })
        })
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}