ios中陀螺仪CoreMotion的用法

转自:http://code.eoe.cn/471/title/ios涓檧铻轰华CoreMotion鐨勭敤娉
README.md
外部引用 原始文档

以前在iphone中要得到加速度时,只能使用Accelerometer模块得到重力加速度分量,然后通过滤波得到加速度值。其实在ios中有一个陀螺仪模块,CoreMotion,使用更方便。

deviceMotion.m 外部引用 原始文档
//初始化CoreMotion
#import

CMMotionManager
* motionManager = [[ CMMotionManager alloc ] init ];
//1. Accelerometer 获取手机加速度数据
CMAccelerometerData
* newestAccel = motionManager . accelerometerData ;
double accelerationX = newestAccel . acceleration . x ;
double
accelerationY = newestAccel . acceleration . y ;
double
accelerationZ = newestAccel . acceleration . z ;
//2. Gravity 获取手机的重力值在各个方向上的分量,根据这个就可以获得手机的空间位置,倾斜角度等
double gravityX = motionManager . deviceMotion . gravity . x ;
double gravityY = motionManager . deviceMotion . gravity . y ;
double gravityZ = motionManager . deviceMotion . gravity . z ;
//获取手机的倾斜角度:

double zTheta = atan2 ( gravityZ , sqrtf ( gravityX * gravityX + gravityY * gravityY )) / M_PI * 180.0 ;
double xyTheta = atan2 ( gravityX , gravityY ) / M_PI * 180.0 ;
//zTheta是手机与水平面的夹角, xyTheta是手机绕自身旋转的角度

//3. DeviceMotion 获取陀螺仪的数据 包括角速度,空间位置等

//旋转角速度:

CMRotationRate
rotationRate = motionManager . deviceMotion . rotationRate ;
double
rotationX = rotationRate . x ;
double
rotationY = rotationRate . y ;
double
rotationZ = rotationRate . z ;
//空间位置的欧拉角(通过欧拉角可以算得手机两个时刻之间的夹角,比用角速度计算精确地多)
double roll = motionManager . deviceMotion . attitude . roll ;
double
pitch = motionManager . deviceMotion . attitude . pitch ;
double yaw = motionManager . deviceMotion . attitude . yaw ;
//空间位置的四元数(与欧拉角类似,但解决了万向结死锁问题)
double w = motionManager . deviceMotion . attitude . quaternion . w ;
double wx = motionManager . deviceMotion . attitude . quaternion . x ;
double wy = motionManager . deviceMotion . attitude . quaternion . y ;
double
wz = motionManager . deviceMotion . attitude . quaternion . z ;
//通过陀螺仪模块可以实现模拟赛车,模拟射击等。

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