Hi, I am going some project on the sensors on Android.
I didn't understand coordination transform mechanism inside Android. 1. I know AXIS_X,AXIS_Y,AXIS_Z. but can anyone tell me what exactly the three axis (AXIS_MINUS_X, AXIS_MINUS_Y, AXIS_MINUS_Z) mean? 2. what do the rotation matrix and incline matrix mean in android? 3. can anyone tell me the inside theory fundamental and algorithm of getRotationMatrix? It sounds reasonable to use magnetic field sensor data and gravity data to get the orientation of the phone. but how to implement it. 4. it is said that the compass can be calibrated by drawing 8's in air in different directions. can anyone tell me or give me some references of the theory base of this method? I didn't understand why this works. Thanks --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
