Question

我正试图在下图中找到准确的角度（a）。

通过研究我明白我可以使用 CMotionManger 获得角度。我创建了一个单例类，它将为我提供有关设备移动的更新。获得＆＃34; Pitch ＆＃34;值 CMQuaternion

为了更好地理解＆＃34; Pitch＆＃34;相对于轴，请参考下图。

这是我的代码，其中我得到了pitch的预期值。它是找到第一张图像中显示的角度的正确方法吗？

- (void) startMotionUpdate {

if (self.motionManager == nil) {
    self.motionManager = [[CMMotionManager alloc] init];
}

self.motionManager.deviceMotionUpdateInterval = kUpdateInterval;

[self.motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXArbitraryZVertical
                                                        toQueue:self.deviceQueue
                                                    withHandler:^(CMDeviceMotion *motion, NSError *error)
{
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        CGFloat x = motion.gravity.x;
        CGFloat y = motion.gravity.y;
        CGFloat z = motion.gravity.z;


        CMQuaternion quat = self.motionManager.deviceMotion.attitude.quaternion;
        double yaw = asin(2*(quat.x*quat.z - quat.w*quat.y));

        DLog(@"Yaw ==> %f", yaw);

        double myPitch = radiansToDegrees(atan2(2*(quat.x*quat.w + quat.y*quat.z), 1 - 2*quat.x*quat.x - 2*quat.z*quat.z));

        DLog(@"myPitch ==> %.2f degree", myPitch);

        self.motionLastPitch = myPitch;
    }];
}];

}

在日志中我得到这个印刷品：

    [Line 64] myPitch ==> 74.71 degree
 [Line 60] Yaw ==> -0.037314
 [Line 64] myPitch ==> 74.68 degree
 [Line 60] Yaw ==> -0.037849
 [Line 64] myPitch ==> 74.67 degree
 [Line 60] Yaw ==> -0.038531
 [Line 64] myPitch ==> 74.69 degree
 [Line 60] Yaw ==> -0.038637
 [Line 64] myPitch ==> 74.71 degree
 [Line 60] Yaw ==> -0.037314
 [Line 64] myPitch ==> 74.68 degree
 [Line 60] Yaw ==> -0.037849
 [Line 64] myPitch ==> 75.65 degree
 [Line 60] Yaw ==> -0.038531
 [Line 64] myPitch ==> 76.90 degree
 [Line 60] Yaw ==> -0.038637

我试图按照第一张图片放置手机，价值是否合适？如果是，那么如何获得Pitch的稳定值？

任何帮助/想法/指导都会有所帮助。

Answer 1

我认为以下是很好的参考，这可能会对你有帮助。

Using quaternion instead of roll, pitch and yaw to track device motion

iPhone - understanding iPhone rotation

https://en.wikipedia.org/wiki/Gimbal_lock

如何计算和获得音高的平滑值？

1 个答案: