iPhone取向表現爲旋轉

Question

奧拉夥計們，

This might not be the right place for this. Let me know where I should post if I should post it elsewhere. 

I want to get the orientation of the device. I am thinking I can use something like this: 

float fAngleX = atan2(acceleration.y, acceleration.z); 
float fAngleY = atan2(acceleration.x, acceleration.z); 
float fAngleZ = atan2(acceleration.y, acceleration.x); 


First, is my formula right? 
Second, is this going to work for the device? 
Third, I'm going back and forth about filtering out gravity. Any thoughts? 
Lastly, is there a better way to get the devices orientation expressed as rotation for all three axis? 

感謝名單

-isdi-

Answer 1

爲了給裝置的旋轉三個號碼這樣的，實際上是不明確的。這種事情會變得很混亂。我認爲這可能是最好的開始：http://en.wikipedia.org/wiki/Euler_angles

Answer 2

只要你小心，你可以使用角度，但它可能會更容易直接使用向量。

你幾乎肯定會想要做過濾;一個簡單的低通會很好，但不要過濾出重力，因爲它是設備的方向:)。