Oh , finally this post comes out 3 days later. I am new here, and thanks for group owner .
在 2012年6月21日星期四UTC+8上午12时24分20秒，CuGBabyBeaR写道： > > I'm a Chinese and sorry about my English is not good . > > That is my problem: > How can I get two angel? > angel 1. angel between device surface and the level > angel 2. azimuth of device surface (azimuth of the projection of device > surface normal vector) > > I read the document on developer.android.com which part about class > Sensor.Event , and have several questions. > > 1. Is sensor of type TYPE_ORIENTATION really physically exist ? > In the document , it told me that :"use getRotationMatrix() in > conjunction with remapCoordinateSystem() and getOrientation() to compute > these values instead." > (this is it > http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_ORIENTATION > ) > Since I can compute the orientation values by other two sensor values , > why is there a redundant sensor exist? > > 2. I need to compute the normal vector of device surface? > I want to get the angel between device surface and the level . > In my mind , I put device in the world coordinate system : Y point to > North , X point to East , Z point to sky > Then for the two angel I want , I only need to get the normal vector > of device surface . > > 3. How can I get the normal vector? > Whether I use sensor of type > TYPE_ORIENTATION or use getRotationMatrix() plus getOrientation() , the > values I can get are Azimuth Pitch and Roll ( differences are only on > sign and 3 angels is in degree or radian ). > I tried several different way to rotation vector (0,0,1) with this 3 angels > to get the normal vector , but all of them seems do not work .Help me , > make is work please. T T > > > Thank in advance. > > -- 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
