2014/10/16 上午 08:14:13

android Programming Glossary: getrotationmatrix

How can I get the magnetic field vector, independent of the device rotation?

http://stackoverflow.com/questions/11772923/how-can-i-get-the-magnetic-field-vector-independent-of-the-device-rotation

system of the following picture you have to multiply the magnetic vector m with the rotation matrix R retrieved from getRotationMatrix like R m . This vector will point through the earth to the magnetic north pole. If you also multiply it with inclination..

calculate acceleration in reference to true north

http://stackoverflow.com/questions/14963190/calculate-acceleration-in-reference-to-true-north

the orientation but I do not know how I should do this. I would try to get the device orientation using SensorManager.getRotationMatrix and SensorManager.getOrientation . Then I get the declination by GeomagneticField.getDeclination and apply it on the azimuth.. want is the coordinate of this vector in the world coordinate which is simply R rotation matrix obtained by calling getRotationMatrix A_D accelerator vector return by sensor A_D event.values.clone A_W R A_D is the same acceleration vector in the world coordinate.. and magnetic contain output from their respective sensors float R new float 9 float I new float 9 SensorManager.getRotationMatrix R I gravity magnetic float A_D values.clone float A_W new float 3 A_W 0 R 0 A_D 0 R 1 A_D 1 R 2 A_D 2 A_W 1 R 3 A_D 0 R..

Convert magnetic field X, Y, Z values from device into global reference frame

http://stackoverflow.com/questions/15315129/convert-magnetic-field-x-y-z-values-from-device-into-global-reference-frame

if accelerometerValues null geomagneticValues null float Rs new float 16 float I new float 16 if SensorManager.getRotationMatrix Rs I accelerometerValues geomagneticValues float RsInv new float 16 Matrix.invertM RsInv 0 Rs 0 float resultVec new float.. returned by the TYPE_MAGNETIC_FIELD sensor and similarly for a . In android the rotation matrix is obtained by calling getRotationMatrix float R float I float gravity float geomagnetic and we normally pass in the returned accelerometer values for the gravity..

Using getRotationMatrix and getOrientation in Android 2.1

http://stackoverflow.com/questions/2963705/using-getrotationmatrix-and-getorientation-in-android-2-1

getRotationMatrix and getOrientation in Android 2.1 I've been having issues with this for far too long. This code should output dx dy dz.. null accelerometerValues null sensorReady sensorReady false float R new float 16 float I new float 16 SensorManager.getRotationMatrix R I accelerometerValues geomagneticMatrix float actual_orientation new float 3 SensorManager.getOrientation R actual_orientation..

Different values between sensors TYPE_ACCELEROMETER/TYPE_MAGNETIC_FIELD and TYPE_ORIENTATION

http://stackoverflow.com/questions/4174389/different-values-between-sensors-type-accelerometer-type-magnetic-field-and-type

mValues event.values.clone break float R new float 16 float orientationValues new float 3 SensorManager.getRotationMatrix R null aValues mValues SensorManager.getOrientation R orientationValues orientationValues 0 float Math.toDegrees orientationValues.. magnetic dip . The accelerometer vector and magnetometer vector can be combined mathematically through SensorManager.getRotationMatrix which returns a 3x3 matrix which will map vectors in device coordinates to world coordinates or vice versa. For a device..

How can I use SensorManager.getOrientation for tilt controls like “My Paper Plane”?

http://stackoverflow.com/questions/4576493/how-can-i-use-sensormanager-getorientation-for-tilt-controls-like-my-paper-plan

orientation values to text fields. Here is the most relevant snippet private void computeOrientation if SensorManager.getRotationMatrix m_rotationMatrix null m_lastMagFields m_lastAccels SensorManager.getOrientation m_rotationMatrix m_orientation 1 radian..