I have written a small code to convert the device co-ordinates into
world co-ordinates by multiplying the Rotation matrix(using
getRotationMatrix) and the vector (Ax,Ay,Az) which are the
accelerometer values. When I run this, and the phone is static, I get
a very fluctuating value for the Z axis(from 9.3 to 10.3) and the
other two are 0. However when I give the phone some acceleration in
any direction , it still doesn't show any change to those values and
they remain zero. This is the part of the code where I get the values.
if(ctp.getType()==Sensor.TYPE_ACCELEROMETER){
Ca[0]=event.values[0];
Ca[1]=event.values[1];
Ca[2]=event.values[2];
SensorManager.getRotationMatrix(R, I, Ca , Cm);
for(i=0;i<16;i++)
rotmat[i/4][i%4]=R[i];
fAx=0;
fAy=0;
fAz=0;
Ca[3]=0;
for(i=0;i<4;i++){
fAx+=rotmat[0][i]*Ca[i];
fAy+=rotmat[1][i]*Ca[i];
fAz+=rotmat[2][i]*Ca[i];
}
buff1.append(fAx);
x.setText(buff1.toString());
buff2.append(fAy);
y.setText(buff2.toString());
buff3.append(fAz);
z.setText(buff3.toString());
}
else if(ctp.getType()==Sensor.TYPE_MAGNETIC_FIELD){
Cm[0]=event.values[0];
Cm[1]=event.values[1];
Cm[2]=event.values[2];
}
Also I would like to know if it would be better to get the rotation
matrix based on the orientation sensor on my own or use the inbuilt
getRotationMatrix?
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