I'm trying to translate the accelerometer values from the device
coordinates to the world coordinates.
It's not clear how to do this.
I guess getRotationMatrix method can do sth about this,and I use the
matrix R the method generated multiply accelerometer values but I did
not get what I expected.
Here is my code:
====================================================
public void onSensorChanged(SensorEvent event) {
if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){
t1.setText("X:"+event.values[0]);
t2.setText("Y:"+event.values[1]);
t3.setText("Z:"+event.values[2]);
e1=event.values.clone();
b=true;
}
if(event.sensor.getType()==Sensor.TYPE_MAGNETIC_FIELD)
{
t8.setText("X:"+event.values[0]);
t9.setText("Y:"+event.values[1]);
t10.setText("Z:"+event.values[2]);
e2=event.values.clone();
b=true;
}
if(event.sensor.getType()==Sensor.TYPE_ORIENTATION){
t11.setText("X:"+event.values[0]);
t12.setText("Y:"+event.values[1]);
t13.setText("Z:"+event.values[2]);
}
if(e1!=null&e2!=null&b==true){
float[] R=new float[9];
float[] I=new float[9];
float[] outR=new float[9];
float[] e3=new float[3];
boolean b=SensorManager.getRotationMatrix(R,I,
e1, e2);
float[] result=new float[3];
result[0]=R[0]*e1[0]+R[1]*e1[1]+R[2]*e1[2];
result[1]=R[3]*e1[0]+R[4]*e1[1]+R[5]*e1[2];
result[2]=R[6]*e1[0]+R[7]*e1[1]+R[8]*e1[2];
t19.setText("X:"+e3[0]);
t20.setText("Y:"+e3[1]);
t21.setText("Z:"+e3[2]);
if(result[0]>10.0f|result[1]>10.0f){
Log.i("aaa", "X:"+result[0]+"
Y:"+result[1]+" Z:"+result[2]);
}
b=false;
}
}
The above code seems can do sth expected.When the device stays
statically,result[0] and result[1] approach 0 and result[2] approaches
standard gravity.But when you give the device a acceleration in any
direction,result[0] and result[1] are still 0 while result[2] varies a
lot.
Any help would be appreciated.
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